Abstract

The present invention relates to an isolated switched-mode power supply (SMPS) and an SMPS system. The isolated SMPS includes N (≥2) primary side circuits, N secondary side circuits, an isolated control module and N transformers. Each primary side circuit includes a power switch, and each secondary side circuit includes a synchronous rectifier. The isolated control module includes a primary side control module, an optocoupler and a secondary side control module, and is adapted to generate, based on output voltage signal and winding voltage signals from secondary windings, N PWM signals staggered in phase from one another and transmit them to control terminals of power switches, enabling staggered control of N power switches. This multi-phase control provided by the isolated control module in the isolated SMPS allows for optimized EMI shielding performance, a balanced thermal distribution, less output ripple, smaller required output capacitance and significantly improved cost effectiveness of isolated SMPS.

IPC Classes  ?

• H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/44 - Circuits or arrangements for compensating for electromagnetic interference in converters or inverters

Abstract

The present application provides an isolated switched-mode power supply, a control method and a computer-readable storage medium. The isolated SMPS includes: primary side circuits each including a power switch; secondary side circuits each including a synchronous rectifier; at least two transformers each including a primary winding connected in series with power switch and a secondary winding connected in series with synchronous rectifier, the number of primary side circuits, the number of secondary side circuits and the number of transformers are equal to one another; an isolated controller adapted to: receive output voltage signal from output terminal and winding voltage signals from secondary windings; based on the output voltage signal and winding voltage signals, generate PWM signals, the number of PWM signals is the same as the number of primary side circuits, and the PWM signals are staggered in phase; and transmit PWM signals to control terminals of power switches.

IPC Classes  ?

• H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/44 - Circuits or arrangements for compensating for electromagnetic interference in converters or inverters

Abstract

An isolated power converter and a control circuit thereof are disclosed. The control circuit includes a secondary side controller which receives a first sample signal characterizing an output voltage of the isolated power converter and generates a first control signal. A primary side control module receives a second sample signal characterizing primary side current and generates a second control signal which controls state of a primary side power transistor, providing PSR. A secondary side follow-up control module receives the first control signal and generates a third control signal which controls states of primary side power transistor, thus providing SSR. A control switching module receives a third sample signal characterizing output voltage and causes switching from PSR to SSR when the third sample signal satisfies a predefined condition. During startup of isolated power converter, PSR is provided first, and switching is then caused to SSR when the predefined condition is satisfied.

IPC Classes  ?

• H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/00 - Details of apparatus for conversion
• H02M 1/36 - Means for starting or stopping converters

Abstract

A control device and method for a flyback converter, a flyback converter and a power supply system are disclosed. The device is configured to apply a tuning voltage or current to a connection node of a secondary winding and a synchronous rectifier within a predetermined period of time after the synchronous rectifier is turned off and before a power transistor switch is turned on. It is also configured to, after the tuning voltage or current is applied, transmit a request signal requesting the power transistor switch to be turned on to a primary controller. The primary controller then turns on the power transistor switch based on the received request signal.

IPC Classes  ?

• H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/00 - Details of apparatus for conversion

Abstract

A control circuit and method for an isolated switching-mode converter are disclosed. The control circuit includes a primary-side controller and a secondary-side controller. The primary-side controller can enter a sleep mode in response to a first request signal, and the primary-side controller can turn on or off a first switch in the primary-side circuit in a predefined manner to cause a secondary-side winding in a transformer to generate a predefined first output signal. The secondary-side controller can detect the first output signal and responsively enter the sleep mode. In this way, both the primary-side and secondary-side controllers can enter the sleep mode, thus significantly reducing standby power dissipation of the system.

IPC Classes  ?

• H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/00 - Details of apparatus for conversion

Abstract

The present invention provides a switched-mode power converter. A control circuit in the switched-mode power converter includes first and second control chips and a magnetic coupling chip coupled to both the former two. The magnetic coupling chip provides a galvanically isolated communication link between the first control chip and the second control chip. With the aid of the second control chip and the magnetic coupling chip, the control circuit can provide a feedback signal to the first control chip and thereby act on turn-on and turn-off of a switching device in the switching circuit. In this way, desirable output and isolation performance can be achieved. Since the first control chip, the second control chip and the magnetic coupling chip can be integrated at a high degree of integration, the switched-mode power converter can have a high degree of integration, reduced size and lower cost.

IPC Classes  ?

• H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
• H01L 23/31 - Encapsulation, e.g. encapsulating layers, coatings characterised by the arrangement
• H01L 23/495 - Lead-frames

Abstract

An interface control circuit, a control method and an interface control device. The interface control circuit is suitable for use in a dimming system compatible with both DALI dimming and push-button dimming. The interface control circuit includes a DALI signal reception control module having a first switch element. The DALI signal reception control module is configured to be enabled, upon a voltage at a power supply terminal of the interface control circuit reaching a pre-start voltage, to turn on or off the first switch element according to the magnitude of a voltage on a DALI bus. The pre-start voltage is lower than a start voltage of the interface control circuit. This invention can ensure accuracy and reliability of rapid communication reestablishment over a period of time from a power-off to the next power-on of the DALI bus.

IPC Classes  ?

• H05B 47/24 - Circuit arrangements for protecting against overvoltage
• H05B 47/165 - Controlling the light source following a pre-assigned programmed sequenceLogic control [LC]

Abstract

A controller, an isolated power converter and a control method are disclosed. The controller includes a primary-side regulator and a secondary-side regulator. The secondary-side regulator includes a secondary-side regulation signal generation module, which receives a feedback signal of an output voltage of the isolated power converter, generates a first control signal and couples the first control signal to the primary-side regulator. The primary-side regulator includes: a PSR module, which receives a voltage signal across a winding of the isolated power converter and generates a second control signal, thereby executing a PSR mode; a follow-up SSR module, which receives the first control signal and generates a third control signal, thereby executing an SSR mode; and a regulation switching module, which allows a switching between the PSR and SSR modes. The present invention allows the follow-up SSR module to enable the SSR mode, which avoids overshooting of the output voltage during startup.

IPC Classes  ?

• H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/36 - Means for starting or stopping converters

Abstract

A controller and an isolated power converter are disclosed. The controller includes: a bypass terminal coupled to a bypass capacitor; a first power circuit coupled to the bypass terminal and a first terminal, the first terminal configured to transfer electric charge from the first terminal to the bypass terminal; a second power circuit coupled to the first terminal, a second terminal and a third terminal, the second and third terminals coupled to a flying capacitor, the second power circuit configured to transfer electric charge from the first terminal to the flying capacitor; and a charging control circuit coupled to control the first or second power circuit to transfer electric charge to the bypass terminal, in response to at least one of a voltage at the bypass terminal and a voltage at the first terminal. The present invention eliminates influence of switching frequency variation and reduces sensitivity to an output voltage.

IPC Classes  ?

• H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/00 - Details of apparatus for conversion
• H02M 3/07 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode

Abstract

The present invention provides a built-in ripple injection circuit and a control chip, in which a divided feedback voltage is obtained by division of an output voltage by a feedback circuit, and high-frequency ripple in the output voltage is obtained by an operational amplifier and a first capacitor. Moreover, the high-frequency ripple is injected at a third terminal of a source follower. As a result, the feedback voltage is a superimposition of the divided feedback voltage with the high-frequency ripple. This can enhance stability and interference resilience of a power supply system operating in a ripple-based COT control mode. Further, the built-in ripple circuit can be integrated in the control chip. This dispenses with the use of a large capacitor and satisfactorily addresses applications requiring on-chip integration of the feedback circuit, reducing the cost of the power supply system.

IPC Classes  ?

• H02M 1/14 - Arrangements for reducing ripples from DC input or output
• H02M 3/156 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
• H03F 3/45 - Differential amplifiers

Abstract

A control circuit for an isolated power supply and an isolated power supply are disclosed. The control circuit includes a secondary-side and a primary-side control signal generation circuits. In a present switching period, the secondary-side control signal generation circuit provides an indication for turning on asynchronous rectification transistor when detecting that a voltage across a secondary-side winding reaches a first predetermined voltage and provides an indication for turning off the synchronous rectification transistor when a period of time over which the synchronous rectification transistor is conducted reaches a first conduction time. The first conduction time is adjustable based on a first instant at which an indication for turning off the synchronous rectification transistor was provided in a previous switching period, a second instant at which an indication for turning on a primary-side switching transistor was provided in the previous switching period and a predetermined reference period.

IPC Classes  ?

• H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/00 - Details of apparatus for conversion
• H02M 1/088 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices

Abstract

A control circuit for an isolated power supply and an isolated power supply are disclosed. The control circuit includes a secondary control signal generation circuit, which, when detecting a voltage of a secondary winding reaches a first preset voltage value after a primary switching transistor is turned off, provides an instruction to turn on a synchronous rectification transistor. Following elapse of a predetermined period of time after the synchronous rectification transistor is turned on, the secondary control signal generation circuit detects a voltage/current of the synchronous rectification transistor, obtains a first electrical signal and derives a second electrical signal from the first electrical signal. When further detecting that the voltage/current of the synchronous rectification transistor reaches the value of the second electrical signal, the secondary control signal generation circuit provides an instruction to turn off the synchronous rectification transistor.

IPC Classes  ?

• H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters

Abstract

A control circuit for an isolated power supply is disclosed, the control circuit includes a secondary-side drive signal generator, a secondary-side transistor switch turn-off detector and a primary-side control signal generator. The primary-side control signal generator is configured to: determine a second turn-on instant referring to an turn-off instant of the secondary-side synchronous rectification transistor from the turn-off acknowledgement signal; determine a first turn-on instant referring to a supposed turn-on instant for the primary-side transistor switch from the feedback signal of the output voltage of the isolated power supply; and determine the turn-on instant for the primary-side transistor switch from the second turn-on instant or the first turn-on instant whichever is later, and responsively generate the primary-side transistor switch control signal. This control circuit can effectively avoid shoot-through of primary- and secondary-side transistor switches at the cost of only insignificantly compromised feedback adjustment accuracy.

IPC Classes  ?

• H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/38 - Means for preventing simultaneous conduction of switches

Abstract

A control method and control circuit for a switched-mode power supply (SMPS) and a control chip are disclosed. The SMPS is switched between different operating modes based on different levels of its output voltage. When the output voltage is lower than a first reference and the difference between it and the first reference exceeds a threshold, an operating frequency of a power transistor and output voltage are controlled to satisfy a proportional relationship defined by an associated slope. When the output voltage is lower than the first reference and the difference between it and the first reference is below the threshold, the power transistor is controlled to operate at a fixed frequency. When the output voltage is higher than the first reference, the power transistor is controlled to operate at a variable frequency.

IPC Classes  ?

• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
• H02M 1/00 - Details of apparatus for conversion
• H02M 7/217 - Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Abstract

An LED driving circuit, which is used for driving an LED load and ameliorating flickers caused by ripples in a mains supply. The driving circuit comprises: a rectifier bridge group, which has at least one group of output ports and is used for rectifying a mains supply; a load branch, which allows forming two different current paths and comprises an LED load and an LED constant-current control circuit; and a capacitive branch, which at least comprises an input capacitor, wherein the load branch takes a turn-on voltage thereof as a threshold value, and selects a power supply source from between the rectified mains supply and the input capacitor. The LED driving circuit has a simple structure and high reliability, and can optimize the input current harmonic performance while preventing flickers, and thus meet the requirements of various standards.

IPC Classes  ?

• H05B 45/00 - Circuit arrangements for operating light-emitting diodes [LED]

Abstract

An inductor current reconstruction circuit, a controller and a switched-mode power supply are disclosed. The inductor current reconstruction circuit includes an AC component reconstruction module having a charge/discharge capacitor, which is coupled to an inductor and configured to charge or discharge the charge/discharge capacitor, based on voltage difference between voltages at opposing ends of the inductor, or on voltage difference between a voltage at one end of the inductor and another voltage associated with the voltage at the end of the inductor, at a current proportional to the voltage difference. The AC component reconstruction module outputs a reconstructed signal characterizing an AC component in a current through the inductor. Inductor current reconstruction can be achieved without detecting ON/OFF states of power transistors. This makes the precision of inductor current reconstruction immune from influence of both any voltage drop across power transistors and simultaneous turn-off of upper and lower power transistors.

IPC Classes  ?

• H03F 1/02 - Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
• H02M 1/088 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
• H03F 3/45 - Differential amplifiers

Abstract

A current detection circuit and a controller for a switching converter circuit are disclosed. An emulated current generation module emulates a current flowing through an inductor, and a current sampling module actually samples the inductor current. Moreover, an error determination module determines an error between the actually sampled and emulated currents and adjusts, based on the error, a rate of variation of the emulated current.

IPC Classes  ?

• H02M 1/00 - Details of apparatus for conversion
• G01R 19/165 - Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
• H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load

Abstract

An LED dimming method, a dimming controller and system are disclosed. In a phase where a duty cycle of a PWM signal does not exceed a first threshold, every n periods of the PWM signal is taken as one set, taking a set as an output unit, and the duty cycle of the PWM signal is changed by incrementing or decrementing a average duty cycle by a first predetermined amount ΔP1 (0<ΔP1<0.2%), thereby adjusting an output current of an LED. In this way, the duty cycle of the PWM signal can be configured to increment by the first predetermined amount ΔP1 that is smaller than 0.2%. Moreover, when the first threshold is 10%, it can be ensured that each period of the PWM signal with duty cycle value within the range of 0-10% can be identified.

IPC Classes  ?

• H05B 45/10 - Controlling the intensity of the light
• H05B 45/325 - Pulse-width modulation [PWM]
• H05B 45/3725 - Switched mode power supply [SMPS]

Abstract

A control circuit, system and method for switched-mode power supply are disclosed, the control circuit is for driving a first switch to convert an input voltage into an output voltage. The control circuit includes an on-time control unit, which receives a first signal characterizing switching frequency of first switch and a second signal characterizing current flowing through first switch and responsively generates a signal indicative of a turn-off instant for first switch. When a peak value of the current flowing through the first switch drops below a predefined value, the on-time control unit determines the turn-off instant for the first switch based on the first signal so that the switching frequency of the first switch is maintained at a target frequency. This design can effectively avoid the generation of audible noise, stabilize the output voltage against load changes while maintaining desirable efficiency, and ensure operational safety of the switched-mode power supply.

IPC Classes  ?

• H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/00 - Details of apparatus for conversion
• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• H02M 1/44 - Circuits or arrangements for compensating for electromagnetic interference in converters or inverters

Abstract

A control circuit for a switched-mode power converter to generate a control signal for controlling switching transistors in the power converter is disclosed. The control circuit includes: a comparator; a ramp compensation circuit for producing and applying a ramp compensation signal to a first or second input of the comparator; an on-time generation circuit to generate an on-time timer signal; and a control signal generation circuit to generate, based on the comparison signal and the on-time timer signal, the control signal for controlling the switching transistors in the power converter. The ramp compensation signal output from the ramp compensation circuit is configured with: a first slope during an inductor demagnetization interval in operation of the power converter in CCM and a second slope during an inductor demagnetization interval and a zero-current interval in operation of the power converter in DCM, the first slope is greater than the second slope.

IPC Classes  ?

• H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
• H02M 1/00 - Details of apparatus for conversion
• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters

Abstract

An LDMOS device includes a semiconductor substrate of a first conductivity type, a doped drift region of a second conductivity type formed on at least a portion of the substrate, and a body region of the first conductivity type formed in the drift region. Source and drain regions of the second conductivity type are formed proximate an upper surface of the body region and drift region, respectively, and spaced laterally from one another. A gate structure is disposed between the source and drain regions and includes a control gate formed over the body region, and a field plate formed over the drift region, the gate structure being electrically isolated from the body and drift regions by a first insulating layer. An oxide structure is formed on a portion of the field plate and a portion of the drift region, the oxide structure overlapping a corner of the field plate.

IPC Classes  ?

• H01L 29/78 - Field-effect transistors with field effect produced by an insulated gate
• H01L 29/40 - Electrodes
• H01L 21/762 - Dielectric regions

Abstract

A high-frequency LDMOS device includes a semiconductor substrate of a first conductivity type, a doped drift region of a second conductivity type formed on the substrate, and a body region of the first conductivity type formed in the doped drift region. Source and drain regions of the second conductivity type are formed proximate an upper surface of the body region and doped drift region, respectively, and spaced laterally from one another. A first insulating layer is formed on the body and doped drift regions. A gate structure including multiple gate segments is formed on the first insulating layer. Each of the gate segments is spaced laterally from one another by a second insulating layer disposed between adjacent gate segments. A spacing between adjacent gate segments is controlled as a function of a thickness of the second insulating layer, a thickness of the first and second insulating layers being independently controlled.

IPC Classes  ?

• H01L 29/78 - Field-effect transistors with field effect produced by an insulated gate
• H01L 29/10 - Semiconductor bodies characterised by the shapes, relative sizes, or dispositions of the semiconductor regions with semiconductor regions connected to an electrode not carrying current to be rectified, amplified, or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
• H01L 21/265 - Bombardment with wave or particle radiation with high-energy radiation producing ion implantation
• H01L 29/423 - Electrodes characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched

Abstract

A semiconductor structure includes at least a first chip, the first chip comprising a semiconductor substrate and an active layer formed on an upper surface of the substrate, one or more lateral metal-oxide semiconductor devices being formed in the active layer of the first chip. The semiconductor structure further includes at least a first integrated capacitor disposed on a back-side of the semiconductor substrate of the first chip. The first integrated capacitor includes a first conductive layer in electrical connection with the back-side of the substrate, an insulating layer formed on at least a portion of an upper surface of the first conductive layer, and a second conductive layer formed on at least a portion of an upper surface of the insulating layer.

IPC Classes  ?

• H01L 27/06 - Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including a plurality of individual components in a non-repetitive configuration
• H01L 25/18 - Assemblies consisting of a plurality of individual semiconductor or other solid-state devices the devices being of types provided for in two or more different main groups of the same subclass of , , , , or
• H01L 25/065 - Assemblies consisting of a plurality of individual semiconductor or other solid-state devices all the devices being of a type provided for in a single subclass of subclasses , , , , or , e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group
• H01L 21/822 - Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
• H01L 23/00 - Details of semiconductor or other solid state devices

Abstract

A capacitor is provided for integration with a MOSFET device(s) formed on the same substrate. The capacitor comprises a first plate including a doped semiconductor layer of a first conductivity type, an insulating layer formed on an upper surface of the doped semiconductor layer, and a second plate including a polysilicon layer formed on an upper surface of the insulating layer. An inversion layer is formed in the doped semiconductor layer, beneath the insulating layer and proximate the upper surface of the doped semiconductor layer, as a function of an applied voltage between the first and second plates of the capacitor. At least one doped region of a second conductivity type, opposite the first conductivity type, is formed in the doped semiconductor layer adjacent to a drain and/or source region of the first conductivity type formed in the MOSFET device. The doped region is electrically connected to the inversion layer.

IPC Classes  ?

• H01L 29/78 - Field-effect transistors with field effect produced by an insulated gate
• H01L 21/762 - Dielectric regions
• H01L 29/66 - Types of semiconductor device
• H01L 29/94 - Metal-insulator-semiconductors, e.g. MOS

Abstract

A full voltage sampling circuit includes a main sampling circuit, an assist sampling circuit and a processing circuit. The main sampling circuit receives first and second input voltages, and outputs a first sampling signal according to the first and second input voltages. The first sampling signal represents a differential voltage which indicates a difference between the first input voltage and the second input voltage. The assist sampling circuit receives the first and second input voltages, and outputs a second sampling signal according to the first and second input voltages. The second sampling signal represents the differential voltage. The processing circuit is coupled to the main sampling circuit and the assist sampling circuit, and selects a larger one of currents or voltages of the first and second sampling signals as a sampling result to be outputted.

IPC Classes  ?

• H05B 47/14 - Controlling the light source in response to determined parameters by determining electrical parameters of the light source
• G01R 19/00 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof
• H05B 45/3725 - Switched mode power supply [SMPS]

Abstract

A controller in a switched-mode power supply and a method for control thereof are disclosed by the present invention. The controller provided in the present invention is used to control a power switching device in the switched-mode power supply to convert an input DC voltage into an output DC voltage. The controller includes a sampling and feedback unit and a ramp compensation unit and is configured to obtain a first ramp signal reflecting energy variation of an energy storage element and to produce a second ramp signal from the first ramp signal so that the difference between the second ramp signal and the first ramp signal is lower than a predetermined value.

IPC Classes  ?

• H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters

Abstract

A switched-mode power supply and a control circuit for use in a switched-mode power supply are disclosed. In addition to an EA module, a PWM comparator module and a soft-start voltage generation module, the control circuit also includes an amplitude limiter module for limiting the amplitude of an EA signal based on a soft-start reference voltage and thereby enabling the amplitude of a signal input to the PWM comparator module from the EA module to follow a soft-start control signal and vary stably and smoothly. This can reduce the risk of output voltage and inductor current overshoots due to DC loop establishment during startup of the switched-mode power supply, enhance stability and safety of the power supply system during startup, and accelerate the DC loop establishment.

IPC Classes  ?

• H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
• H02M 1/00 - Details of apparatus for conversion
• H02M 1/42 - Circuits or arrangements for compensating for or adjusting power factor in converters or inverters

Abstract

The present invention provides a controller, a switched-mode power supply and a method for controlling a switched-mode power supply. In response to a change of the switched-mode power supply from a continuous conduction mode to a discontinuous conduction mode, slope compensation is carried out with an output peak voltage raised by a compensating DC offset. Moreover, in response to a change of the switched-mode power supply from the discontinuous conduction mode to the continuous conduction mode, the compensating DC offset is subtracted from the peak voltage. In this way, an additional DC offset that would be introduced by a conventional slope compensation approach can be eliminated, maintaining a valley of a sampled feedback voltage constant both under steady load conditions and during load jumps.

IPC Classes  ?

• H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
• H02M 1/00 - Details of apparatus for conversion

Abstract

A radio frequency (RF) switch device includes a semiconductor substrate, doped with an impurity of a first conductivity type at a first doping concentration level, and a mesa extending vertically from an upper surface of the substrate and formed contiguous therewith. The mesa includes a drift region doped with the impurity of the first conductivity type at a second doping concentration level, the second doping concentration level being less than the first doping concentration level. The mesa forms a primary current conduction path in the RF switch device. The RF switch device further includes an insulator layer disposed on at least a portion of the upper surface of the substrate and sidewalls of the mesa, and at least one gate disposed on at least a portion of an upper surface of the insulator layer, the gate at least partially surrounding the mesa.

IPC Classes  ?

• H01L 29/78 - Field-effect transistors with field effect produced by an insulated gate
• H01L 29/423 - Electrodes characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
• H01L 29/66 - Types of semiconductor device
• H01L 27/088 - Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including only semiconductor components of a single kind including field-effect components only the components being field-effect transistors with insulated gate

Abstract

A power supply circuit, a compensation circuit and a harmonic distortion compensation method thereof are disclosed. The power supply circuit includes a rectifier and filter module, a main power stage module, a voltage waveform detection module and a compensation module. The rectifier and filter module converts an AC voltage into a DC voltage. The main power stage module receives the DC voltage and provides power to a load. The voltage waveform detection module is configured to detect a waveform of the DC voltage and derive, from the waveform, information about each cycle of the DC voltage. The compensation module is configured to generate a compensation signal based on the information about each cycle of the DC voltage and trigger the main power stage module to perform compensation operation based on the compensation signal. The compensation operation is performed to accomplish total harmonic distortion compensation of the power supply circuit.

IPC Classes  ?

• H02J 3/01 - Arrangements for reducing harmonics or ripples
• H02M 1/00 - Details of apparatus for conversion
• H02M 1/12 - Arrangements for reducing harmonics from AC input or output
• H02J 3/18 - Arrangements for adjusting, eliminating or compensating reactive power in networks

Abstract

A controller chip of a flyback converter, a flyback converter and a switched-mode power supply system are disclosed. In the controller chip, a current scaling module is added, which converts a feedback current signal at a feedback pin of the controller chip to allow compensation capacitor with a small capacitance to be integrated into the chip to constitute a required pole compensation module. In this way, a pole required by the feedback pin FB can be successfully provided in the chip. As a result, filtering of high-frequency noise in a feedback path in which the feedback pin FB is located can be achieved, reducing ripple in an output voltage generated by the flyback converter. Moreover, without changing a sampling gain and the compensation pole, it is allowed to greatly reduce the compensation capacitance, for example, to the order of 10 pF.

IPC Classes  ?

• H02M 1/15 - Arrangements for reducing ripples from DC input or output using active elements
• H02M 1/00 - Details of apparatus for conversion
• H02M 1/44 - Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
• H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only

Abstract

A control circuit, a control chip and a power supply device are disclosed by the present invention. The control circuits are used for control of a constant-voltage closed-loop which causes a voltage of a voltage feedback signal obtained from an output voltage to approach a voltage of a reference voltage signal obtained from a base voltage and thereby achieves a constant-voltage output. In addition, when a sampled current obtained from an output current is higher than a predetermined current, or when output power is higher than a predetermined power, the control circuit increases the voltage feedback signal or decreases the reference voltage signal, causing the constant-voltage closed loop to decrease the output voltage and the output current and thereby achieving a limited output current and limited output power.

IPC Classes  ?

• H02M 1/00 - Details of apparatus for conversion
• H02M 1/32 - Means for protecting converters other than by automatic disconnection

Abstract

An output short-circuit protection method, a power management chip and a switched-mode power supply are disclosed. When current accumulation has occurred in a power transistor, the number of consecutive current pulses during which the current accumulation occurred is counted. Upon the number of consecutive current pulses reaches a preset value, a regulation interval spanning switching periods is triggered, for at least some of the switching periods, the leading-edge blanking time is shortened or cancelled. In this way, an excessively large current flowing through the power transistor is prevented. Compared with existing fault response measures for power management chips, restart of the power supply and adjustment of the system timing are not needed, allowing easier implementation. Further, the automatic restart during chip start up due to false triggering as found in the existing measures for power management chips is circumvented.

IPC Classes  ?

• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters

Abstract

An operation circuit and a chip pertaining to the field of integrated circuit design technology are disclosed by the present application. The circuit includes a capacitor charging/discharging module and an error amplification module electrically connected to the capacitor charging/discharging module. The capacitor charging/discharging module is configured to receive a first signal and a third signal that are external to the capacitor charging/discharging module and to output a feedback signal. The error amplification module is configured to receive the feedback signal and a second signal that is external to error amplification module and to output, based on the received feedback and second signals, a target signal to the capacitor charging/discharging module. In a steady state, values of the target, first, second and third signals satisfy a predefined mathematical relationship.

IPC Classes  ?

• G06G 7/16 - Arrangements for performing computing operations, e.g. amplifiers specially adapted therefor for multiplication or division
• H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• H02J 7/34 - Parallel operation in networks using both storage and other DC sources, e.g. providing buffering

Abstract

An operation circuit and a chip pertaining to the field of integrated circuit design technology are disclosed by the present invention. The circuit includes a capacitor charging/discharging module and an error amplification module electrically connected to the capacitor charging/discharging module. The capacitor charging/discharging module is configured to receive first, second and third signals external to the capacitor charging/discharging module, and to output a reference signal and a feedback signal. The error amplification module is configured to receive the reference and feedback signals and output a target signal to the capacitor charging/discharging module based on the received reference and feedback signals. The first, second and third signals are all analog signals, and in a steady state, values of the target, first, second and third signals satisfy a predefined mathematical relationship.

IPC Classes  ?

• G06G 7/16 - Arrangements for performing computing operations, e.g. amplifiers specially adapted therefor for multiplication or division
• H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• H02J 7/34 - Parallel operation in networks using both storage and other DC sources, e.g. providing buffering

Abstract

A control circuit for a constant-current drive circuit, as well as a constant-current drive circuit are disclosed. The control circuit can obtain output information of the constant-current drive circuit and use it in combination with reference information to determine, according to an output condition corresponding to the current load of the constant-current drive circuit, a time point for the system to enter or exit a rapid drive mode. Therefore, it can be suitably used in various application scenarios to determine a time point for the system to entry into or exit from the rapid start mode. Compared with fast charging for a fixed period of time as used in the prior art, embodiments of the present invention can effectively overcome the problem of easy overshooting or inadequate acceleration during start as found in various applications.

IPC Classes  ?

• H05B 45/345 - Current stabilisationMaintaining constant current
• H05B 45/375 - Switched mode power supply [SMPS] using buck topology

Abstract

A magnetic core structure and an electromagnetic coupling device are provided by the present application. Wherein the magnetic core structure includes a first magnetic core and a second magnetic core; the first magnetic core includes a main portion and two side pillars fixedly connected to the main portion. Convex structures are set on end surfaces of the two side pillars away from the main portion, respectively; and the convex structures abut against a surface of the second magnetic core after the first magnetic core and the second magnetic core are assembled together, so as to form a gap between the end surfaces of the two side pillars away from the main portion and the surface of the second magnetic core. The magnetic core structure and the electromagnetic coupling device disclosed by the present application can precisely control an air gap between the two magnetic cores.

IPC Classes  ?

• H01F 3/14 - ConstrictionsGaps, e.g. air-gaps
• H01F 27/24 - Magnetic cores

Abstract

A MOSFET device includes a semiconductor substrate, serving as a drain region, and an epitaxial region disposed on an upper surface of the substrate. The MOSFET device includes multiple body regions formed in the epitaxial region, and multiple source regions. The body regions are disposed near an upper surface of the epitaxial region and spaced laterally from one another, and each of the source regions is disposed in a corresponding one of the body regions near an upper surface of the body region. The MOSFET device includes a gate structure having multiple planar gates and a trench gate. Each of the planar gates is disposed on the upper surface of the epitaxial region overlapping a corresponding body region. The trench gate is formed partially through the epitaxial region and between the body regions, an upper surface of the trench gate being recessed below the upper surface of the epitaxial region.

IPC Classes  ?

• H01L 29/423 - Electrodes characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
• H01L 29/36 - Semiconductor bodies characterised by the concentration or distribution of impurities
• H01L 29/78 - Field-effect transistors with field effect produced by an insulated gate
• H01L 29/66 - Types of semiconductor device

Abstract

A high power factor control circuit is disclosed, which is used in an AC/DC converter. The converter includes a rectification module, a conversion module and a load. The rectification module receives AC power and rectifies it into a DC current, and the conversion module converts the DC current to drive power as desired by the load and provides it to the load. The conversion module includes a conversion element including an inductive element and a switching element. The control circuit includes a peak limiting signal generator and a switching element control module. The peak limiting signal generator receives a reference signal and produces at least one peak limiting signal from a sample signal. The switching element control module is configured to control switching of the switching element so that, within at least half a line-frequency period, a value of the ripple in the output current flowing through the load is not greater than a limit value.

IPC Classes  ?

• H02M 1/42 - Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
• H02M 1/15 - Arrangements for reducing ripples from DC input or output using active elements
• H02M 7/06 - Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
• H05B 45/20 - Controlling the colour of the light
• H05B 45/355 - Power factor correction [PFC]Reactive power compensation
• H05B 45/36 - Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
• H05B 45/3725 - Switched mode power supply [SMPS]
• H05B 45/59 - Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDsCircuit arrangements for operating light-emitting diodes [LED] responsive to LED lifeProtective circuits for reducing or suppressing flicker or glow effects

Abstract

A control circuit (20), system and control method for a switching power supply (10). The control circuit (20) for a switching power supply (10) is used for driving a first switch (11) in the switching power supply (10) to convert an input voltage into an output voltage. The control circuit (20) comprises an on time control unit (21), wherein the on time control unit (21) receives a first signal and a second signal, the first signal represents the switching frequency of the first switch (11), and the second signal represents the current flowing through the first switch (11), so as to generate a signal for indicating an off moment of the first switch (11); and when a peak value of the current flowing through the first switch (11) is less than a preset current value, the on time control unit (21) determines the off moment of the first switch (11) according to the first signal, so as to keep the switching frequency of the first switch (11) at a basically constant target frequency value. Therefore, the generation of audio noise is effectively avoided, an output voltage can be stabilized in the case of a load change, and a relatively high efficiency is maintained, such that the safe working of the switching power supply (10) is ensured.

IPC Classes  ?

• H02M 1/44 - Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
• H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• H02M 7/217 - Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters

Abstract

A control circuit for a power converter is disclosed. The power converter includes a switching circuit including a first switching transistor and a second switching transistor. The control circuit includes: a comparator having a first input configured to receive at least a reference signal, a second input configured to receive at least a feedback signal and an output configured to output a comparison signal; a minimum off-time generation circuit; an on-time generation circuit for producing an on-time signal for controlling both the first switching transistor and the second switching transistor; and a ramp compensation circuit configured to generate a ramp compensation signal.

IPC Classes  ?

• H02M 3/155 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Abstract

A control circuit, system and method for switched-mode power supply are disclosed, the control circuit is for driving a first switch to convert an input voltage into an output voltage. The control circuit includes an on-time control unit, which receives a first signal characterizing switching frequency of first switch and a second signal characterizing current flowing through first switch and responsively generates a signal indicative of a turn-off instant for first switch. When a peak value of the current flowing through the first switch drops below a predefined value, the on-time control unit determines the turn-off instant for the first switch based on the first signal so that the switching frequency of the first switch is maintained at a target frequency. This design can effectively avoid the generation of audible noise, stabilize the output voltage against loading changes while maintaining desirable efficiency, and ensure operational safety of the switched-mode power supply.

IPC Classes  ?

• H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/00 - Details of apparatus for conversion
• H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load

Abstract

A control circuit for a power converter comprising switching transistors and an output inductor is disclosed. One terminal of the output inductor serves as an output node, and another terminal of the output inductor serves as a switching node. The control circuit is configured to generate a control signal for controlling switching transistors in the power converter. The control circuit includes: a RC oscillator network connected to two terminals of the output inductor, the RC oscillator network configured to generate an oscillation signal containing a feedback ramp slope compensation component in response to a change in a voltage across the terminals of the output inductor; a comparator; an on-time generation circuit; and a control signal generation circuit to generate the control signal for controlling the switching transistors in the power converter.

IPC Classes  ?

• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
• G05F 1/575 - Regulating voltage or current wherein the variable actually regulated by the final control device is DC using semiconductor devices in series with the load as final control devices characterised by the feedback circuit
• H02M 3/156 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
• H02M 1/00 - Details of apparatus for conversion
• H02M 5/22 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
• H02M 5/293 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Abstract

Isolated power supply control circuits, isolated power supply and control method thereof are disclosed, the control circuit for controlling an isolated power supply includes a secondary-side control signal generator and a primary-side control signal generator. The secondary-side control signal generator produces a secondary-side transistor switch control signal containing information about a turn-off instant of a secondary-side synchronous rectification transistor, which serves as a second turn-on instant. The primary-side control signal generator derives, from a feedback signal, a supposed turn-on instant for a primary-side transistor switch, which serves as a first turn-on instant. The primary side turn-on signal generator further derives a turn-on instant for the primary-side transistor switch from the second or first turn-on instant whichever is later and responsively generates a primary-side transistor switch control signal. This control circuit can effectively avoid shoot-through of primary- and secondary-side transistor switches at the cost of only insignificantly compromised feedback adjustment accuracy.

IPC Classes  ?

• H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/38 - Means for preventing simultaneous conduction of switches

Abstract

The invention relates to a multi-phase power supply regulator and a temperature balance control method thereof. The method comprises: providing a multi-phase power supply regulator which includes a controller and a plurality of power stages, transmitting a plurality of control signals to the plurality of power stages respectively by the controller. Each of the plurality of power stages includes a temperature sampling unit, wherein outputs of the temperature sampling units are connected in parallel and the plurality of power stages outputs a temperature detection signal. The invention determines one of the plurality of power stages comprising highest temperature by sequentially adjusting the control signals, the temperature of the power stage is reduced, and the temperatures of the multi-phase power supply regulator are balanced.

IPC Classes  ?

• G06F 1/00 - Details not covered by groups and
• G06F 1/20 - Cooling means
• G06F 1/3206 - Monitoring of events, devices or parameters that trigger a change in power modality

Abstract

A control circuit (101) for an isolated power supply, and the isolated power supply and a control method therefor. The control circuit (101) for the isolated power supply comprises a secondary side control signal generator (102) and a primary side control signal generator (103). The secondary side control signal generator (102) generates a secondary side switch tube control signal (SRoff) comprising information of a turn-off moment (K2) of a secondary side synchronous rectifier tube (SR), and the turn-off moment (K2) is used as a second turn-on moment (K2). The primary side control signal generator (103) obtains, on the basis of a feedback signal (VFB), a moment that a primary side switch tube (Q1) should be turned on as a first turn-on moment (K1). The primary side control signal generator (103) further determines a turn-on moment of the primary side switch tube (Q1) on the basis of the later moment of the second turn-on moment (K2) and the first turn-on moment (K1), so as to generate a primary side switch tube (Q1) control signal (PSC). The control circuit (101) can effectively prevent the punch-through of the primary side switch tube (Q1) and the secondary side switch tube (SR), and does not cause excessive influence on the precision of feedback regulation.

IPC Classes  ?

• H02M 1/38 - Means for preventing simultaneous conduction of switches

Abstract

A multi-phase control circuit and a temperature balance control method thereof The temperature balance control method of the multi-phase control circuit includes the steps of: acquiring a first temperature signal reflecting a representative temperature among a plurality of power stages, then acquiring a plurality of second temperature signals reflecting a respective temperature of each of the plurality of power stages; and adjusting a pulse width and/or frequency of a pulse width modulation signal of at least one of the plurality of power stages according to a comparison result between the first temperature signal and the second temperature signal so as to balance the temperatures of the plurality of power stages.

IPC Classes  ?

• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• G05F 1/567 - Regulating voltage or current wherein the variable actually regulated by the final control device is DC using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for temperature compensation
• H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
• H02M 3/04 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters

Abstract

The present invention relates to a multi-phase voltage regulator and a temperature monitoring method thereof. The method includes the following steps of: step 1a: providing a multi-phase voltage regulator including a controller and a plurality of power stages, wherein the controller transmits a corresponding control signal to each of the plurality of power stages, each of the plurality of power stages including a temperature sampling unit, outputs of the temperature sampling units connected to the controller and in parallel with each other; Step 1b: performing time-sharing signal exchange with the temperature sampling unit of the power stages; and Step 1c: when the controller exchanges signals with the temperature sampling unit of a certain power stage, the temperature sampling unit transmits an output signal representing the temperature thereof to the controller via the output.

IPC Classes  ?

• H02M 3/04 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
• G01K 1/02 - Means for indicating or recording specially adapted for thermometers
• G01K 7/00 - Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat

Abstract

The present invention discloses a multi-phase power supply dynamic response control circuit and a control method. When a rapid rise of the load is detected, an output PWM signal is temporarily adjusted to enter a second operation mode from a first operation mode to supplement energy to the load and prevent the output voltage from decreasing. The present invention requires little modification to the existing circuit, and adopts simple, explicit and efficient detection method, realizing rapid dynamic response by providing sufficient energy for the load when the load current is suddenly increased.

IPC Classes  ?

• H02M 1/00 - Details of apparatus for conversion
• H03K 7/08 - Duration or width modulation

Goods & Services

Recorded computer programs for power management; Recorded computer programs for computer hardware configuration and testing; Integrated circuit cards; Blank integrated circuit cards; Computer hardware; Central processing units for processing information, data, sound or images; Interface cards for data processing equipment in the form of printed circuits; Graphics processor units (GPUs); Computer daughter boards; Computer central processing units; Blank electronic chip cards; Analogue to digital converters; Electronic cards for processing images; Computer motherboards; Computer game cassettes; Cards with integrated circuits; Semi-conductors; Wafers for integrated circuits; Silicon wafers; Printed circuits; Integrated circuits; Electronic chips for the manufacture of integrated circuits; Printed circuit boards; Electromagnetic coils; Transistors; Semi-conductor memory units; Switches, electric; Step-up transformers; Voltage stabilizing power supply; Low-voltage power supplies; Fly back transformers; Overvoltage protection relays; Computer graphics boards; Microchips; Transformers; Voltage stabilizers; Computer circuit boards; Transistors; Semiconductor wafers; Logic circuits; Integrated circuit modules; Electric power converters; Step down transformers; Voltage regulators; Voltage monitor modules; Decision circuits; Distribution transformers; Frequency converter for actuators; Power switches; Power controllers; High frequency switches; High-frequency switching power supplies; Electronic circuits; Direct current converters; Electronic circuit board; Electronic integrated circuits; Electric circuit closers; Power amplifiers; Large scale integrated circuits; Electronic semi-conductors; Electric current control devices; Circuit boards provided with integrated circuits; the aforementioned excluding chargers, electrical cords, power strips, electrical timers, lighting goods, and USB drives Design of integrated circuits; Research in the field of integrated circuits technology; Research and development of new products for others; Development of technologies for the fabrication of circuits for wireless communication, electronic data processing, consumer electronic, automotive electronics; Computer programming; Computer software design; Maintenance of computer software; Consultancy in the design and development of computer hardware; Computer software consultancy; Development of computer platforms

Goods & Services

Recorded computer programs for power management; Recorded computer programs for computer hardware configuration and testing; Integrated circuit cards; Blank integrated circuit cards; Computer hardware; Central processing units for processing information, data, sound or images; Interface cards for data processing equipment in the form of printed circuits; Graphics processor units (GPUs); Computer daughterboards; Computer central processing units; Blank electronic chip cards; Analogue to digital converters; Electronic cards for processing images; Computer motherboards; Computer game cassettes; Cards with integrated circuits; Semi-conductors; Wafers for integrated circuits; Silicon wafers; Printed circuits; Integrated circuits; Electronic chips for the manufacture of integrated circuits; Printed circuit boards; Electromagnetic coils; Transistors; Semi-conductor memory units; Switches, electric; Light dimmers; Lighting ballasts; Step-up transformers; Electrical adapters; Voltage stabilizing power supply; Low-voltage power supplies; Flyback transformers; Overvoltage protection relays; Computer graphics boards; Microchips; Transformers; Voltage stabilizers; Computer circuit boards; Transistors; Semiconductor wafers; Logic circuits; Integrated circuit modules; Electric power converters; Step down transformers; Light switches; Lighting control apparatus; Fluorescent lamp ballast for electric lights; Voltage regulators; Voltage monitor modules; Decision circuits; Cut-out switches; Distribution transformers; Frequency converter for actuators; Power switches; Power controllers; Power connectors; Electrical outlets; High frequency switches; High-frequency switching power supplies; Electronic circuits; Adapter plugs; Direct current converters; Electronic circuit board; Connectors for electronic circuits; LED drivers; Light emitting diodes (LEDs); Electronic integrated circuits; Electric circuit closers; Power amplifiers; Large scale integrated circuits; Electronic semi-conductors; Apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling the distribution or use of electric current; Voltage surge suppressors; Electric current control devices; DC/AC power converters; Electric light dimmers; Circuit boards provided with integrated circuits; Power adapters Design of integrated circuits; Research in the field of integrated circuits technology; Research and development of new products for others; Development of technologies for the fabrication of circuits for wireless communication, electronic data processing, consumer electronic, automotive electronics; Computer programming; Computer software design; Maintenance of computer software; Consultancy in the design and development of computer hardware; Computer software consultancy; Development of computer platforms

Abstract

Multiphase power processing circuit and a method for control thereof are disclosed, with which, exchange of data is achievable between a multiphase controller and any of power processing circuits via pins of at least two of the three categories, Enable, PWM and Temperature Indicator, of the multiphase controller. The exchanged data may include, but is not limited to, a phase identifier, an over-current protection threshold, an over-current protection threshold, an over-temperature protection threshold, a current sampling gain, a current sampling bias, a temperature sampling gain, a temperature sampling bias, a drive speed and the like of the power processing circuit. In this way, improvements in system flexibility and security are obtained.

IPC Classes  ?

• H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
• H02M 3/157 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control
• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• H02M 1/00 - Details of apparatus for conversion
• H02M 1/088 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices

Abstract

The present invention discloses a multi-phase power supply dynamic response control circuit and a control method. When a rapid rise of the load is detected, an output PWM signal is temporarily adjusted to enter a second operation mode from a first operation mode to supplement energy to the load and prevent the output voltage from decreasing. The present invention requires little modification to the existing circuit, and adopts simple, explicit and efficient detection method, realizing rapid dynamic response by providing sufficient energy for the load when the load current is suddenly increased.

IPC Classes  ?

• H02M 1/00 - Details of apparatus for conversion
• H03K 7/08 - Duration or width modulation

Abstract

A switch-mode power supply (SMPS), an SMPS system and a power supply method for an SMPS system are disclosed. The SMPS controller includes an output-voltage power supply unit, a built-in energy storage unit and a logic control unit. The output-voltage power supply unit is configured to charge the built-in energy storage unit using an output voltage from the SMPS system so that the built-in energy storage unit can provide an operating voltage for the logic control unit. The use of a stand-off energy storage capacitor can be dispensed with, and the use of the output voltage as a power supply is enabled. As a result, significant reductions in overall and standby power dissipation are achieved. In addition, the SMPS controller may further include a high-voltage power supply unit, which provides a hybrid power supply solution, together with the output-voltage power supply unit.

IPC Classes  ?

• H02M 1/00 - Details of apparatus for conversion
• H02M 3/156 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
• H02M 1/36 - Means for starting or stopping converters

Abstract

A control circuit, a chip and a control method are disclosed. The control circuit includes: an adjustment signal generation unit configured to detect an electrical signal reflecting a power supplied to a load under control of a current value of a reference signal, generate a feedback signal and output an adjustment signal based on both the feedback signal and the reference signal; and a control unit coupled to the adjustment signal generation unit and configured to control the switching circuit on and off based on the adjustment signal. With the generated adjustment signal that reflects a change in an adjustment metric indicated in the reference signal, the control circuit and the driving system can be adapted in real time to the specifications of any AC power standard. Moreover, much more granular adjustments can be made in the power supplied to the load.

IPC Classes  ?

• H03K 5/156 - Arrangements in which a continuous pulse train is transformed into a train having a desired pattern
• H05B 45/14 - Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
• H05B 45/325 - Pulse-width modulation [PWM]
• H05B 45/3725 - Switched mode power supply [SMPS]
• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
• H02M 7/06 - Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode

Abstract

A MOSFET device includes an epitaxial region disposed on an upper surface of a substrate, the substrate serving as a drain region in the MOSFET device, and at least two body regions formed in the epitaxial region. The body regions are disposed proximate an upper surface of the epitaxial region and spaced laterally apart. The device further includes at least two source regions disposed in respective body regions, proximate an upper surface of the body regions, and a gate structure including at least two planar gates and a trench gate. Each of the planar gates is disposed on the upper surface of the epitaxial region and overlaps at least a portion of a corresponding body region. The trench gate is formed partially through the epitaxial region and between the body regions.

IPC Classes  ?

• H01L 29/423 - Electrodes characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
• H01L 29/36 - Semiconductor bodies characterised by the concentration or distribution of impurities
• H01L 29/66 - Types of semiconductor device
• H01L 29/78 - Field-effect transistors with field effect produced by an insulated gate

Abstract

An LDMOS device includes a doped drift region of a first conductivity type formed on an upper surface of a substrate having a second conductivity type. A body region of the second conductivity type is formed proximate an upper surface of the doped drift region. Source and drain regions of the first conductivity type are formed proximate an upper surface of the body region and doped drift region, respectively, and spaced laterally from one another. A gate is formed over the body region and between the source and drain regions. The gate is formed on a first insulating layer for electrically isolating the gate from the body region. A shielding structure is formed over at least a portion of the doped drift region on a second insulating layer. The gate and shielding structure are spaced laterally from one another to thereby reduce parasitic gate-to-drain capacitance.

IPC Classes  ?

• H01L 29/78 - Field-effect transistors with field effect produced by an insulated gate
• H01L 29/66 - Types of semiconductor device
• H01L 29/51 - Insulating materials associated therewith
• H01L 29/423 - Electrodes characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
• H01L 29/40 - Electrodes
• H01L 29/10 - Semiconductor bodies characterised by the shapes, relative sizes, or dispositions of the semiconductor regions with semiconductor regions connected to an electrode not carrying current to be rectified, amplified, or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
• H01L 29/08 - Semiconductor bodies characterised by the shapes, relative sizes, or dispositions of the semiconductor regions with semiconductor regions connected to an electrode carrying current to be rectified, amplified, or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
• H01L 29/06 - Semiconductor bodies characterised by the shapes, relative sizes, or dispositions of the semiconductor regions
• H01L 21/265 - Bombardment with wave or particle radiation with high-energy radiation producing ion implantation
• H01L 21/762 - Dielectric regions

Abstract

A dimming control circuit, driving device and control method thereof, the dimming control circuit comprising a dimmer, a driving device coupled to the dimmer and controlling a load on the basis of a dimming level reference of the dimmer, and a bleeder supplying power to the dimmer, the driving device including a power switch coupled to the load, wherein a duty ratio of a driving voltage on the power switch is adjusted in accordance with the dimming level reference to control an operating current of the load.

IPC Classes  ?

• H05B 45/14 - Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
• H05B 45/50 - Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDsCircuit arrangements for operating light-emitting diodes [LED] responsive to LED lifeProtective circuits
• H05B 45/325 - Pulse-width modulation [PWM]

Abstract

A power conversion circuit and a method thereof, wherein the power conversion circuit includes a first grid interface and a second grid interface coupled to an AC power source, a power harvesting module, a sampling module and a switching module. The power harvesting module is coupled to the first grid interface, and the power harvesting module includes a first diode and a first charging capacitor coupled to the first diode. The power harvesting module receives the AC power source from the first grid interface to generate an output voltage. The switching module includes a switch component controlled by the sampling module. The sampling module is coupled to the power harvesting module and acquires a sampling voltage. The sampling module controls the switch component to be turned off during at least a period of time within positive half cycles of the AC power source.

IPC Classes  ?

• H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 7/217 - Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
• H02M 1/00 - Details of apparatus for conversion

Abstract

The present disclosure provides a leakage protection circuit, a method and a drive device. The leakage protection circuit is used for being electrically connected with the power supply line of a load, and may be configured to sample the power supply line at intervals, detect the voltage of the sampled electrical signals to determine whether the voltage of the AC input power is divided, and provide leakage protection based on the determined result. The present disclosure can prevent human from electric shock through sampling the electric signals from the power supply line at intervals and performing voltage detection and comparasion to determine whether the voltage of the accessed AC input power is divided, when the voltage of the accessed AC input power is determined to be divided, the power supply line will be controlled in non-conductive state.

IPC Classes  ?

• H05B 45/345 - Current stabilisationMaintaining constant current
• F21V 25/04 - Safety devices structurally associated with lighting devices coming into action when lighting device is disturbed, dismounted, or broken breaking the electric circuit
• F21K 9/272 - Details of end parts, i.e. the parts that connect the light source to a fittingArrangement of components within end parts
• G01R 31/44 - Testing lamps
• H05B 45/50 - Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDsCircuit arrangements for operating light-emitting diodes [LED] responsive to LED lifeProtective circuits
• H05B 45/37 - Converter circuits
• G01R 31/52 - Testing for short-circuits, leakage current or ground faults
• H05B 45/36 - Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
• H05B 45/395 - Linear regulators

Abstract

A low-pass filter, a switching control circuit, a driving system, a chip and methods are disclosed. The low-pass filter performs digital differential-integral process on a voltage of an acquired analog signal and a predefined reference voltage to generate differential-integral signals, accumulates a count of the differential-integral signals, and convert the result to an analog signal. By performing differential-integral process accumulating a count of the differential-integral signals, a low-pass filtered signal is obtained in a way that solves the problem of low integrity of circuits in conventional driving systems, reduces the complexity of external circuits for such driving systems and increases their circuit stability.

IPC Classes  ?

• H02M 1/00 - Details of apparatus for conversion
• H02M 1/15 - Arrangements for reducing ripples from DC input or output using active elements
• H05B 45/36 - Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
• H05B 45/3725 - Switched mode power supply [SMPS]

Abstract

A linear driving system for LED with high power factor including a rectifying circuit receiving an AC voltage and generating a DC voltage to a power supply bus having a protection circuit coupled thereto. The protection circuit includes a detection unit for acquiring a voltage signal based on a power supply bus voltage, and to generate a detection result which indicates undesirable oscillation on the power supply bus voltage. A control unit includes a delay control module connected with the detection unit, and is coupled to the detection unit and for generating a control signal based on the detection result. The delay control module is for outputting a first control signal when undesirable oscillation happens, and outputting a second control signal after a protection period when undesirable oscillation disappears. A switch circuit controlled by the first control signal and the second control signal turns off for the protection period.

IPC Classes  ?

• H05B 45/50 - Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDsCircuit arrangements for operating light-emitting diodes [LED] responsive to LED lifeProtective circuits
• H05B 45/37 - Converter circuits
• H02M 1/14 - Arrangements for reducing ripples from DC input or output

Abstract

The present invention discloses a control circuit, a LED driving system, and a LED driving method. The control circuit receives a feedback signal from the power converter and generate a ZCD pulse signal accordingly, indicating one or more moments when the feedback signal decreases to zero, and receives a dimming signal and generate a minimum turn-off time signal accordingly, indicating the moment when a minimum turn-off time is passed. The control circuit generates a first turn-on signal according to the ZCD pulse signal and the minimum turn-off time signal to control a switching device within the power converter to turn on when the feedback signal decreases to zero and the minimum turn-off time is passed.

IPC Classes  ?

• H05B 45/14 - Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
• H05B 45/392 - Switched mode power supply [SMPS] wherein the LEDs are placed as freewheeling diodes at the secondary side of an isolation transformer
• H05B 45/385 - Switched mode power supply [SMPS] using flyback topology
• H05B 45/375 - Switched mode power supply [SMPS] using buck topology
• H05B 45/38 - Switched mode power supply [SMPS] using boost topology

Abstract

A control circuit with a high power factor that is applied to an AC/DC conversion circuit. The conversion circuit comprises a rectification module, a conversion module and a load, wherein the rectification module receives an alternating current and rectifies same into a direct current, the conversion module converts the direct current to a drive power according to the load and provides the drive power for the load, the conversion module comprises a conversion unit having an inductance element and a switch unit switched between an on state and an off state, and a current passing through the inductive element forms a ripple remaining on the basis of the alternating current. The control circuit comprises a peak value limiting unit and a drive unit, wherein the peak value limiting unit inputs a reference signal and generates at least one peak value limiting signal according to a sampling signal, and the drive unit is coupled to the switch unit and controls switching of the switch unit on the basis of the peak value limiting signal, so that at least within half a power frequency period, when a voltage on the inductance element is higher than a threshold value, the ripple of the current of the inductance element is not higher than a limit value.

IPC Classes  ?

• H02M 1/42 - Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
• H02M 7/04 - Conversion of AC power input into DC power output without possibility of reversal by static converters
• H02M 1/14 - Arrangements for reducing ripples from DC input or output
• H05B 33/08 - Circuit arrangements for operating electroluminescent light sources

Abstract

A control circuit and method for a bleeder, a chip, and a driver system. The bleeder control circuit is connected to a dimmer detector used for detecting the presence or absence of a dimmer and a type of the dimmer. The control circuit of the bleeder is used to receive a detection signal outputted by the dimmer detector, and generate a control signal for the bleeder according to the detection signal, the control signal is used to control an operating state of the bleeder. The application correspondingly generates a control signal for a bleeder according to a detection signal indicating the presence or absence of a dimmer and the type of the dimmer so as to control the bleeder to operate only at a given phase interval, and may thereby reduce the power consumption of the bleeder when ensuring the stable operation of a dimmer.

IPC Classes  ?

• H05B 45/3575 - Emulating the electrical or functional characteristics of incandescent lamps by means of dummy loads or bleeder circuits, e.g. for dimmers
• H05B 45/10 - Controlling the intensity of the light
• H05B 41/38 - Controlling the intensity of light

Abstract

The present invention provides a power control circuit which has a timing unit used for timing an elapsed time of current half cycle of the phase-cut AC power supply signal, outputting a current accumulated timing duration, and outputting a first control signal at a starting moment when a starting point of a half cycle of the AC power supply signal is detected; a regulating unit connected to the timing unit and comprising a temporary storage module, wherein a final reference time interval is stored in the temporary storage module, and when the current accumulated timing duration reaches the final reference time interval, the regulating unit outputs a second control signal; and a control unit connected to the detection unit and the regulating unit and used for controlling current in a load based on the first control signal and the second control signal.

IPC Classes  ?

• H05B 45/345 - Current stabilisationMaintaining constant current
• H05B 45/36 - Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
• H05B 47/16 - Controlling the light source by timing means

Abstract

A MOSFET device includes an epitaxial region disposed on an upper surface of a substrate, and at least two body regions formed in the epitaxial region. The body regions are disposed proximate an upper surface of the epitaxial region and spaced laterally apart. The device further includes at least two source regions disposed in respective body regions, proximate an upper surface of the body regions, and a gate structure including at least two planar gates and a trench gate. Each of the planar gates is disposed on the upper surface of the epitaxial region and overlaps at least a portion of a corresponding body region. The trench gate is formed partially through the epitaxial region and between the body regions. A drain contact disposed on a back surface of the substrate provides electrical connection with the substrate.

IPC Classes  ?

• H01L 29/423 - Electrodes characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
• H01L 29/36 - Semiconductor bodies characterised by the concentration or distribution of impurities
• H01L 29/78 - Field-effect transistors with field effect produced by an insulated gate
• H01L 29/66 - Types of semiconductor device

Abstract

A dimming interface control circuit (52), and an LED driving system and an LED driving method utilizing said dimming interface control circuit (52). Using the dimming interface control circuit (52), only one interface (561) is required to support both PWM dimming and analog dimming, without the need for two ports, and without the need for additional external filter capacitors. Costs are therefore low. A received PWM signal or analog signal are both processed into a pulse width modulation signal, and a constant current reference voltage (Vref_CC) is chopped in a pulse width manner. The invention provides for high dimming precision, large dimming depth, and good batch uniformity.

IPC Classes  ?

• H05B 33/08 - Circuit arrangements for operating electroluminescent light sources

Abstract

A control circuit (2), a driving system, a chip, a control method and a driving method. The control circuit (2) comprises: a detection unit (21), used for detecting an electrical signal for reflecting the power supply on a load side under the control of a current adjustment control signal and generating a detection signal, and outputting, according to the detection signal and the adjustment control signal, an adjustment signal; and a control unit (22), connected to the detection unit (21), and used for controlling, based on the adjustment signal, a conducting duration and/or a disconnecting duration of a switch circuit (12). By reflecting, by means of the generated adjustment signal, an adjustment measurement difference before and after an adjustment control signal is changed, a circuit (2) and a driving system can be controlled, in real time, to adapt to any alternating-current voltage standard; in addition, the conducting duration and the disconnecting duration of the switch circuit (12) are controlled by using adjustment measurement information, thereby effectively improving the adjustment depth of load power supply adjustment.

IPC Classes  ?

• H05B 33/08 - Circuit arrangements for operating electroluminescent light sources
• H05B 37/02 - Controlling

Abstract

Provided in the present application are a lower pass filter, a switch control circuit, a driving system, a chip and a method, wherein the low pass filter carries out digital difference integration processing on a voltage of an acquired analogue signal and a preset reference voltage and generates difference integration signals, and counts the difference integration signals in an accumulative manner, and converts same to analogue filter signals. According to the present application, a low pass filter signal is generated by means of difference integration processing and accumulative counting; the problem of a low degree of integration of various circuits in a driving system is solved; and complexity of an external circuit of the driving system is reduced, and circuit stability of the driving system is improved.

IPC Classes  ?

• H05B 33/08 - Circuit arrangements for operating electroluminescent light sources

Goods & Services

Electric current converters; direct current converters; electric power converters; electronic power controller; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity; integrated circuits module; lighting control apparatus; electronic control gears [ECGs] for LED lamps and light fixtures; semi-conductors. Distribution of prospectuses and samples; distribution of products for advertising purposes; distribution of advertising matter; presentation of products to the public; dissemination of advertising material [leaflets, brochures and printed matter]; dissemination of advertising and publicity materials; distribution of samples; providing commercial information via internet, wired network or data transmission in other forms; providing commercial information via global computer networks. Technological research; conducting technical project studies; quality control; research and development of new products for others; material testing; industrial design; computer software design; consultancy in the design and development of computer hardware; computer software consultancy.

Goods & Services

Electric current converters; direct current converters; electric power converters; electronic power controller; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity; integrated circuits module; lighting control apparatus; electronic control gears [ECGs] for LED lamps and light fixtures; semi-conductors. Distribution of prospectuses and samples; distribution of products for advertising purposes; distribution of advertising matter; presentation of products to the public; dissemination of advertising material [leaflets, brochures and printed matter]; dissemination of advertising and publicity materials; distribution of samples; providing commercial information via internet, wired network or data transmission in other forms; providing commercial information via global computer networks. Technological research; conducting technical project studies; quality control; research and development of new products for others; material testing; industrial design; computer software design; consultancy in the design and development of computer hardware; computer software consultancy.

Abstract

Disclosed are a control circuit, an LED driving chip, an LED driving system, and an LED driving method. Low-frequency flicking caused by valley switching asymmetry at a conventional conduction moment is eliminated, no flicking during deep dimming is guaranteed, a flicking point existing in a dimming process when using a conventional switch conduction moment is eliminated, and lighting experience of a user is enhanced.

IPC Classes  ?

• H05B 33/08 - Circuit arrangements for operating electroluminescent light sources

Abstract

The present disclosure provides a leakage protection circuit, a method and a drive device. The leakage protection circuit is used for being electrically connected with the power supply line of a load, and may be configured to sample the power supply line at intervals, detect the voltage of the sampled electrical signals to determine whether the voltage of the AC input power is divided, and provide leakage protection based on the determined result. The present disclosure can prevent human from electric shock through sampling the electric signals from the power supply line at intervals and performing voltage detection and comparison to determine whether the voltage of the accessed AC input power is divided, when the voltage of the accessed AC input power is determined to be divided, the power supply line will be controlled in non-conductive state.

IPC Classes  ?

• H05B 45/37 - Converter circuits
• H05B 45/50 - Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDsCircuit arrangements for operating light-emitting diodes [LED] responsive to LED lifeProtective circuits
• F21V 25/04 - Safety devices structurally associated with lighting devices coming into action when lighting device is disturbed, dismounted, or broken breaking the electric circuit
• F21K 9/272 - Details of end parts, i.e. the parts that connect the light source to a fittingArrangement of components within end parts
• G01R 31/44 - Testing lamps

Abstract

Provided by the present application are a control circuit and method for a bleeder circuit, a chip, and a driving system and method. The control circuit of the bleeder circuit is connected to a detection circuit used for detecting the presence or absence of a dimming device and the type of said dimming device, and a bleeder circuit, wherein the control circuit of the bleeder circuit is used to receive a detection signal outputted by the detection circuit, and generate a control signal for said bleeder circuit according to the detection signal, said control signal being used to control an operating state of the bleeder circuit. The present application correspondingly generates a control signal for a bleeder circuit according to a detection signal indicating the presence or absence of a dimmer and the type of the dimmer so as to control the bleeder circuit to operate only at a given phase interval, and may thereby reduce the power consumption of the bleeder circuit when ensuring the stable operation of a dimmer or a dimming device.

IPC Classes  ?

• H05B 37/02 - Controlling

Abstract

A power control circuit, a driving system, a chip, a power control method, and a driving method. The power control circuit comprises: a timing unit (21) used for timing a power supply signal within current unit time, outputting a current accumulated timing duration, and outputting a first control signal at a starting moment when a first waveform is detected; a regulating unit (22) connected to the timing unit (21) and comprising a temporary storage module (221), wherein a reference time interval is stored in the temporary storage module (221), and when the current accumulated timing duration reaches a reference time interval, the regulating unit (22) outputs a second control signal; and a control unit (23) connected to the detection unit and the regulating unit (22) and used for controlling current in a load based on the first control signal and the second control signal. The problem of stroboflash in LED lighting devices is solved by detecting a first waveform in waveforms of the power supply signal in the current unit time and shielding a transition time interval between the first waveform and a second waveform.

IPC Classes  ?

• H05B 33/08 - Circuit arrangements for operating electroluminescent light sources

Abstract

Provided are a TRIAC dimmer detection circuit, chip and method, and an LED driving chip and system. A bus voltage reflecting signal is received, and a TRIAC dimmer detection signal is generated according to the bus voltage reflecting signal, a first reference voltage and a second reference voltage, the dimmer detection signal being used to detect whether a dimmer exists and to determine the type of the dimmer. The TRIAC dimmer detection circuit, chip and method, and the LED driving chip and system consistent with the present invention can detect whether a TRIAC dimmer is contained in an LED illuminating system, so as to determine a working state of a bleeder, thereby reducing the power consumption of the entire LED illuminating system and improving the efficiency thereof.

IPC Classes  ?

• H05B 33/08 - Circuit arrangements for operating electroluminescent light sources
• H05B 45/10 - Controlling the intensity of the light
• G01R 31/44 - Testing lamps
• H05B 45/37 - Converter circuits

Abstract

The present disclosure provides a line voltage compensation circuit, an LED drive system and a drive method. The line voltage compensation circuit is configured to receive signal reflecting bus voltage and output line voltage compensation signal based on the received signal reflecting bus voltage, a preset baseline voltage and at least one reference voltage, wherein the line voltage compensation signal has a multi-segment linear relationship with the received signal reflecting bus voltage. In the technical solution provided by the present application, the linear relationship between the feedback voltage of the LED load and the built-in baseline voltage is adjusted based on at least one preset threshold to output segment-based line voltage compensation signal. Compared with the line voltage compensation technology with a single slope, better input voltage line regulation and better LED current line regulation can be obtained by adopting the technical solution provided by the present application.

IPC Classes  ?

• H05B 33/08 - Circuit arrangements for operating electroluminescent light sources
• H03F 3/45 - Differential amplifiers

Abstract

The present invention discloses a position-sensorless control method for a brushless motor, the method including: turning off a first driving voltage of a first phase coil, and within detection time, detecting a back electromotive force of the first phase coil; determining a reference phase and a cycle of a second driving voltage according to the back electromotive force; determining a pulse width modulation signal according to the reference phase and the cycle; and determining to provide the second driving voltage for the brushless motor according to the pulse width modulation signal, the second driving voltage being used to drive the brushless motor. The present invention effectively reduces the cost, decreases implementation difficulty and increases system performance and reliability.

IPC Classes  ?

• H02P 23/00 - Arrangements or methods for the control of AC motors characterised by a control method other than vector control
• H02P 31/00 - Arrangements for regulating or controlling electric motors not provided for in groups , or

Abstract

A control method and apparatus for a brushless motor without a position sensor. The method comprises: closing a first drive voltage of a first phase coil, and within a detection time, detecting a counter electromotive force of the first phase coil (S110); according to the counter electromotive force, determining a reference phase and a period of a second drive voltage (S120); according to the reference phase and the period, determining a pulse width modulation signal (S130); and according to the pulse width modulation signal, determining to provide the second drive voltage for a brushless motor, the second drive voltage being used for driving the brushless motor. The method and the apparatus can reduce the cost, reduce the implementation difficulty and improve the performance and reliability of a system.

IPC Classes  ?

• H02P 6/18 - Circuit arrangements for detecting position without separate position detecting elements

Abstract

A control method, apparatus and system for pulse width modulation of a direct current brushless electrical motor. The method comprises: acquiring a pulse width modulation (PWM) high-accuracy duty ratio value (101); determining an accuracy extension mode of a PWM signal according to the PWM high-accuracy duty ratio value, wherein the accuracy extension mode comprises an accuracy extension period and an accuracy extension output sequence (102); and within the accuracy extension period, modulating a low-accuracy PWM signal according to the accuracy extension output sequence and outputting a control signal (103). The control method can weaken a speed staircase effect under open-loop control, and reduce a steady state speed error of closed-loop control.

IPC Classes  ?

• H02P 6/10 - Arrangements for controlling torque ripple, e.g. providing reduced torque ripple

Abstract

A TRIAC dimmable light-emitting diode (LED) driver circuit is disclosed, compromising: An alternating-current (AC) voltage connected to a rectifier bridge; An LED load, which is connected to an inductor or a transformer, a power MOS transistor, a low voltage MOS transistor and a current sensing resistor. The LED driver also compromises: a peak current comparator which is used to compare the voltage between a current sensing resistor and a reference voltage; a maximum on-time timer, which is used to detect the on time of the low voltage MOS transistor. When the voltage on the current sensing resistor is higher than the reference voltage or the on time of the low voltage MOS transistor reaches the preset time of the maximum on-time timer, the low voltage MOS transistor is turned off.

IPC Classes  ?

• H05B 37/00 - Circuit arrangements for electric light sources in general
• H05B 39/00 - Circuit arrangements or apparatus for operating incandescent light sources
• H05B 41/14 - Circuit arrangements
• H05B 33/08 - Circuit arrangements for operating electroluminescent light sources

Abstract

A current ripple canceling light-emitting diode (LED) driver is disclosed. The input current source contains a current ripple. The LED load is connected to the drain of a power switch. The source of the power switch is connected to a current sensing resistor. The gate of the power switch is connected to the output of an operational amplifier. The operational amplifier compares the voltage signal across the current sensing resistor with a dynamic reference voltage. The dynamic reference voltage is adjusted according to the gate or drain voltage of the power switch. The LED load current is controlled to be a nearly no ripple DC current.

IPC Classes  ?

• H05B 33/08 - Circuit arrangements for operating electroluminescent light sources