The present invention relates to an electrodynamically synchronized DC-to-AC inverter/converter system (100) that generates a near-sinusoidal output with minimal reliance on high-frequency power electronic switching. A motor-driven cyclic connector (114) sequentially connects multiple voltage stages from a battery or capacitor bank (104), forming a stepped waveform that is smoothed by a reactor (140). In standalone mode, a DC shunt motor (112DM) provides the necessary rotation; for grid-tied operations, a synchronous motor (112SM) automatically locks the output to the grid frequency. The high- current flow bypasses the motor windings, reducing switching losses, electromagnetic interference, and complex gating circuits. Protective devices (116) isolate fault conditions, while optional transformers (130) enable voltage stepping or galvanic isolation. By avoiding high-frequency gating, the invention offers robust, efficient performance for renewable energy systems and other power electronics applications. Simplicity and scalability make it ideal for industrial applications.
H02P 23/04 - Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for damping motor oscillations, e.g. for reducing hunting
H02M 1/14 - Arrangements for reducing ripples from DC input or output
H02M 1/44 - Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
H02M 5/458 - 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 with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
H02M 7/04 - Conversion of AC power input into DC power output without possibility of reversal by static converters
H02M 7/5387 - Conversion of DC power input into AC 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, e.g. single switched pulse inverters in a bridge configuration
2.
A HIGH-VOLTAGE DIRECT CURRENT (HVDC) GENERATION SYSTEM USING UNIDIRECTIONAL VOLTAGE GENERATORS
The present invention discloses a High-Voltage Direct Current (HVDC) generation system designed for efficient and cost-effective HVDC generation. The system comprises a prime mover (102), a flat-top alternating-current voltage generator (exciter) (110), and two unidirectional voltage generators (UVG-1 & UVG-2) (120 & 130), all mounted on a common shaft (104) to ensure synchronization. The prime mover (102) provides rotational motion, while a DC supply excites the field coil of the exciter (110), generating flat-top AC voltages in rotor windings-1 & 2 (116) with a 90° phase shift are supplied to the rotor coils of UVG-1 and UVG-2, which produce alternating rotating magnetic fields. These fields induce unidirectional voltages with a 180° phase shift in the stator windings (124 & 134) of UVG-1 and UVG-2, which are then connected in series to generate constant HVDC output. This innovation eliminates the need for commutation, rectification and filters, reducing the costs and harmonic issues. It offers versatility in connecting to existing HVDC-links, enhances power-transmission capacity.
H02K 39/00 - Generators specially adapted for producing a desired non-sinusoidal waveform
H02K 1/22 - Rotating parts of the magnetic circuit
H02K 23/02 - DC commutator motors or generators having mechanical commutatorUniversal AC/DC commutator motors characterised by arrangement for exciting
H02K 23/66 - Structural association with auxiliary electric devices influencing the characteristic of, or controlling, the machine, e.g. with impedances or switches
3.
AC TO DC CONVERTER SYSTEM WITH REDUCED TRANSFORMER WINDINGS
The AC to DC converter system (100) revolutionizes Variable Frequency Drives (VFDs) by introducing a cost-effective and efficient design. Harnessing a rotating magnetic field strategically induces electro motive force in secondary windings (110), generating a flat-top AC voltage waveform. This inventive approach eliminates the need for numerous secondary windings (110) in the phase shift transformer, significantly cutting costs and simplifying the system architecture. The transformer, mimicking a locked-wound rotor induction motor, ensures a compact footprint. A bridge rectifier (104) enhances the system's stability, providing a reliable DC output with an extended conduction period. The system's scalability accommodates diverse power ratings, making it versatile for high-power rectifiers, VFDs, DC chargers and HVDC transmission systems. Notably, it excels in mitigating harmonics and reducing power diodes required for higher pulse rectifiers, offering a dependable and cost-efficient alternative for various power system applications.
H02M 1/14 - Arrangements for reducing ripples from DC input or output
H02P 27/04 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
H02M 7/04 - Conversion of AC power input into DC power output without possibility of reversal by static converters
H02M 7/162 - 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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
B60L 15/20 - Methods, circuits or devices for controlling the propulsion of electrically-propelled vehicles, e.g. their traction-motor speed, to achieve a desired performanceAdaptation of control equipment on electrically-propelled vehicles for remote actuation from a stationary place, from alternative parts of the vehicle or from alternative vehicles of the same vehicle train for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
H02P 6/08 - Arrangements for controlling the speed or torque of a single motor
4.
A HIGH-VOLTAGE DIRECT CURRENT (HVDC) GENERATION SYSTEM
A high-voltage direct current (HVDC) generation system (100) comprises a prime mover (102), an AC generator (exciter) (104) with two separate windings producing sine and cosine wave AC voltages with a 90-degree phase shift, and two unidirectional voltage generators (UVG1 and UVG2) (106,108) mounted on a common shaft. The synchronization of UVG1 and UVG2 by the prime mover ensures the conversion of AC voltages into unidirectional voltages. The combination of these outputs, guided by the mathematical identity Sin2(θ) + Cos2(θ) = 1, results in a constant DC voltage output. This innovative approach eliminates the need for commutation techniques and offers scalability for generating DC voltages exceeding 500kV. The system to promotes synchronization, reduces waveform distortions, and includes ripple reduction mechanisms for enhanced DC voltage quality. Overall, the disclosed invention presents a comprehensive and streamlined solution for efficient HVDC generation.
H02K 3/28 - Layout of windings or of connections between windings
H02K 23/02 - DC commutator motors or generators having mechanical commutatorUniversal AC/DC commutator motors characterised by arrangement for exciting
H02K 23/26 - DC commutator motors or generators having mechanical commutatorUniversal AC/DC commutator motors characterised by the armature windings
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