A resistor, resistor assembly, and a method of making them are described, with advantages over existing resistors, resistor assemblies, and methods. The resistor includes a helical resistor element wound on an insulator. The insulator has a regularly spaced plurality of teeth on each of two opposite sides, with the helical resistor element situated within the teeth. The insulator provides support for the helical resistor element without use of a separate core within the insulator. The resistor may be assembled by inserting two toothed insulator pieces into a helical resistor element and separating the two insulator pieces such that turns of the helical resistor element are within the teeth of the first and second insulator pieces. Alternatively, the resistor may be assembled by winding a helical resistor element onto a toothed insulator piece.
Magnetic components and a method for making them are described. A conducting material may be cut using a high power laser such as, but not limited to, a rare-earth fiber laser such as a Ytterbium fiber laser. Alternatively, a conducting material may be cut using an abrasive water jet. The magnetic components may be planar.
A low profile high current composite transformer is disclosed. Some embodiments of the transformer include a first conductive winding having a first start lead, a first finish lead, a first plurality of winding turns, and a first hollow core; a second conductive winding having a second start lead, a second finish lead, a second plurality of turns, and a second hollow core; and a soft magnetic composite compressed surrounding the first and second windings. The soft magnetic composite with distributed gap provides for a near linear saturation curve.
Devices to be charged and wireless charging devices are disclosed. A DTBC includes a processing unit, a battery, an axially wound receiver coil and battery charging components. The battery powers the processing unit. The axially wound receiver coil has a first end and a second end located at opposite ends of a central axis of the axially wound receiver coil and receives electromagnetic flux via either one of the first end or the second end. The battery charging components are coupled between the battery and the axially wound receiver coil, convert the electromagnetic flux into direct current (DC) and apply the DC to charge the battery.
An integrated assembly includes a resistor and a heat spreader. The resistor includes a resistive element and terminals. The heat spreader is integrated with the resistor and includes a heat sink of thermally conducting and electrically insulating material and terminations of a thermally conducting material and situated at an edge of the heat sink. At least a portion of a top surface of the resistive element is in thermally conductive contact with the heat sink. Each resistor terminal is in thermally conductive contact with a corresponding termination of the heat sink. A method of fabricating an integrated assembly of a resistor and a heat spreader includes forming the heat spreader, forming the resistor, and joining the heat spreader to the resistor by bonding at least a portion of a top surface of the resistive element to the heat sink and bonding each electrically conducting terminal to a corresponding termination.
H01C 1/084 - Dispositions de réfrigération, de chauffage ou de ventilation par refroidissement naturel, p. ex. ailettes, dissipateurs thermiques
H01C 1/148 - Bornes ou points de prise spécialement adaptés aux résistancesDispositions de bornes ou points de prise sur les résistances les bornes enveloppant ou entourant l'élément résistif
H01C 1/14 - Bornes ou points de prise spécialement adaptés aux résistancesDispositions de bornes ou points de prise sur les résistances
6.
IINTEGRATED CIRCUIT ELEMENT AND ELECTRONIC CIRCUIT FOR LIGHT EMITTING DIODE APPLICATIONS, HAVING THERMISTOR FOR FORWARD VOLTAGE DROP TEMPERATURE COMPENSATION
A system (100), method and circuit (100) for providing constant current to an LED array (125) are described herein. These include a resistor (130) coupled to the LED array (125) and a thermistor (140) coupled to the LED array (125) and the resistor (130). The resistor (130) and the thermistor (140) limit the current at a given temperature and compensate for the forward voltage shift of the LED array (125) as a function of temperature. The system, method and integrated circuit may also include a fuse (150) coupled to the thermistor (140). The fuse (140) allows the system to continue to operate if a single LED (120) within the LED array (125) fails to short- circuit.
A current sense resistor and a method of manufacturing a current sensing resistor with temperature coefficient of resistance (TCR) compensation are disclosed. The resistor has a resistive strip disposed between two conductive strips. A pair of main terminals and a pair of voltage sense terminals are formed in the conductive strips. A pair of rough TCR calibration slots is located between the main terminals and the voltage sense terminals, each of the rough TCR calibration slots have a depth selected to obtain a negative starting TCR value observed at the voltage sense terminals. A fine TCR calibration slot is formed between the pair of voltage sense terminals.
H01C 7/10 - Résistances fixes constituées par une ou plusieurs couches ou revêtementsRésistances fixes constituées de matériaux conducteurs en poudre ou de matériaux semi-conducteurs en poudre avec ou sans matériaux isolants sensibles à la tension, p. ex. varistances
A heat spreader for a resistive element is provided, the heat spreader having a body portion that is arranged over a top surface of the resistive element and electrically insulated from the resistive element. The heat spreader also includes one or more leg portion that extends from the body portion and are associated with the heat sink in a thermally conductive relationship.
A heat spreader for a resistive element is provided, the heat spreader having a body portion that is arranged over a top surface of the resistive element and electrically insulated from the resistive element. The heat spreader also includes one or more leg portion that extends from the body portion and are associated with the heat sink in a thermally conductive relationship.
b to simplify the implementation of four-terminal resistor. Elementary resistors R1, R2 must have the same sign of TCR. Target resistance and TCR minimization in four-terminal resistor are reached by adjustment of resistance of the elementary resistors.
A metal strip resistor is provided with a resistive element disposed between a first termination and a second termination. The resistive element, first termination, and second termination form a substantially flat plate. A thermally conductive and electrically non-conductive thermal interface material such as a thermally conductive adhesive is disposed between the resistive element and first and second heat pads that are placed on top of the resistive element and adjacent to the first and second terminations, respectively.
H01C 1/084 - Dispositions de réfrigération, de chauffage ou de ventilation par refroidissement naturel, p. ex. ailettes, dissipateurs thermiques
H01C 1/14 - Bornes ou points de prise spécialement adaptés aux résistancesDispositions de bornes ou points de prise sur les résistances
H01C 7/00 - Résistances fixes constituées par une ou plusieurs couches ou revêtementsRésistances fixes constituées de matériaux conducteurs en poudre ou de matériaux semi-conducteurs en poudre avec ou sans matériaux isolants
H01C 17/00 - Appareils ou procédés spécialement adaptés à la fabrication de résistances
12.
Resistor with temperature coefficient of resistance (TCR) compensation
A current sense resistor and a method of manufacturing a current sensing resistor with temperature coefficient of resistance (TCR) compensation is disclosed. The resistor has a resistive strip disposed between two conductive strips. A pair of main terminals and a pair of voltage sense terminals are formed in the conductive strips. A pair of rough TCR calibration slots are located between the main terminals and the voltage sense terminals, each of the rough TCR calibration slots have a depth selected to obtain a negative starting TCR value observed at the voltage sense terminals. A fine TCR calibration slot is formed between the pair of voltage sense terminals. The fine TCR calibration slot has a depth selected to obtain a TCR value observed at the voltage sense terminals that approaches zero. The resistor can also have a resistance calibration slot located between the pair of main terminals. The resistance calibration slot has a depth selected to calibrate a resistance value of the resistor.
H01C 7/02 - Résistances fixes constituées par une ou plusieurs couches ou revêtementsRésistances fixes constituées de matériaux conducteurs en poudre ou de matériaux semi-conducteurs en poudre avec ou sans matériaux isolants à coefficient de température positif
13.
RESISTOR WITH TEMPERATURE COEFFICIENT OF RESISTANCE (TCR) COMPENSATION
A current sense resistor and a method of manufacturing a current sensing resistor with temperature coefficient of resistance (TCR) compensation is disclosed The resistor has a resistive strip disposed between two conductive strips A pair of main terminals and a pair of voltage sense terminals are formed in the conductive strips A pair of rough TCR calibration slots are located between the main terminals and the voltage sense terminals, each of the rough TCR calibration slots have a depth selected to obtain a negative starting TCR value observed at the voltage sense terminals A fine TCR calibration slot is formed between the pair of voltage sense terminals The fine TCR calibration slot has a depth selected to obtain a TCR value observed at the voltage sense terminals that approaches zero The resistance calibration slot has a depth selected to calibrate a resistance value of the resistor
H01C 7/06 - Résistances fixes constituées par une ou plusieurs couches ou revêtementsRésistances fixes constituées de matériaux conducteurs en poudre ou de matériaux semi-conducteurs en poudre avec ou sans matériaux isolants présentant des moyens pour réduire au minimum les variations de résistance dépendantes des variations de température
14.
METAL STRIP RESISTOR FOR MITIGATING EFFECTS OF THERMAL EMF
A metal strip resistor (10) includes a resistor body (11) having a resistive element (13) formed from a strip of an electrically resistive metal material and a first termination (16) electrically connected to the resistive element to form a first junction (15) and a second termination (20) electrically connected to the resistive element to form a second junction (17), the first termination and the second termination formed from strips of electrically conductive metal material. The resistive element, the first termination, and the second termination being arranged mitigate thermally induced voltages between the first junction and the second junction.
A metal strip resistor (10) is provided. The metal strip resistor includes a metal strip (18) forming a resistive element and providing support for the metal strip resistor without use of a separate substrate. There are first and second opposite terminations overlaying the metal strip. There is plating (28) on each of the first and second opposite terminations. There is also an insulating material (20) overlaying the metal strip between the first and second opposite terminations. A method for forming a metal strip resistor wherein a metal strip provides support for the metal strip resistor without use of a separate substrate is provided. The method includes coating an insulative material to the metal strip, applying a lithographic process to form a conductive pattern overlaying the resistive material wherein the conductive pattern includes first and second opposite terminations, electroplating the' conductive pattern, and adjusting resistance of the metal strip.
H01C 3/10 - Résistances métalliques fixes en fil ou en ruban, p. ex. bobinées, tressées ou en forme de grille l'élément résistif ayant une forme en zigzag ou sinueuse
H01C 1/142 - Bornes ou points de prise spécialement adaptés aux résistancesDispositions de bornes ou points de prise sur les résistances les bornes ou points de prise étant constitués par un revêtement appliqué sur l'élément résistif
H01C 17/24 - Appareils ou procédés spécialement adaptés à la fabrication de résistances adaptés pour ajuster la valeur de la résistance en supprimant ou en ajoutant du matériau résistif
A highly coupled inductor includes a first ferromagnetic plate, a second ferromagnetic plate, a film adhesive between the first ferromagnetic plate and the second ferromagnetic plate, a first conductor between the first plate and the second plate, and a second conductor between the first plate and the second plate. A conducting electromagnetic shield may be positioned proximate the first conductor for enhancing coupling and reducing leakage flux. A method of manufacturing a highly coupled inductor component includes providing a first ferromagnetic plate and a second ferromagnetic plate, placing conductors between the first ferromagnetic plate and the second ferromagnetic plate, and connecting the first ferromagnetic plate and the second ferromagnetic plate using a film adhesive.
A resistor (12) includes a substantially cylindrical resistive element having a resistance of less than about 1 mθ, a substantially cylindrical first, termination (14) electrically connected to the resistive element and a second termination (16) electrically connected to the resistive element. The substantially cylindrical first termination is hollow to allow for accepting a connection such as from a battery cable (32). In addition there may be sense leads (22, 24) present on the resistor. A method of forming a substantially cylindrical resistor includes forming a hollow cylindrical resistor body by rolling a flat sheet comprising a resistive element and a first termination and a second termination joined on opposite ends of the resistive element.
H01C 1/148 - Bornes ou points de prise spécialement adaptés aux résistancesDispositions de bornes ou points de prise sur les résistances les bornes enveloppant ou entourant l'élément résistif
A power resistor includes first and second opposite terminations, a resistive element formed from a plurality of resistive element segments between the first and second opposite terminations, at least one segmenting conductive strip separating two of the resistive element segments, and at least one open area between the first and second opposite terminations and separating at least two resistive element segments. Separation of the plurality of resistive element segments assists in spreading heat throughout the power resistor. The power resistor or other electronic component may be packaged by bonding to a heat sink tab with a thermally conductive and electrically insulative material.
H01C 1/02 - BoîtiersEnveloppesEnrobageRemplissage de boîtier ou d'enveloppe
H01C 1/08 - Dispositions de réfrigération, de chauffage ou de ventilation
H01C 1/084 - Dispositions de réfrigération, de chauffage ou de ventilation par refroidissement naturel, p. ex. ailettes, dissipateurs thermiques
H01C 17/02 - Appareils ou procédés spécialement adaptés à la fabrication de résistances adaptés à la fabrication de résistances avec enveloppe ou carter
H01C 17/24 - Appareils ou procédés spécialement adaptés à la fabrication de résistances adaptés pour ajuster la valeur de la résistance en supprimant ou en ajoutant du matériau résistif
A biased gap inductor includes a first ferromagnetic plate, a second ferromagnetic plate, a conductor sandwiched between the first ferromagnetic plate and the second ferromagnetic plate, and an adhesive between the first ferromagnetic plate and the second ferromagnetic plate, the adhesive comprising magnet powder to thereby form at least one magnetic gap. A method of forming an inductor includes providing a first ferromagnetic plate and a second ferromagnetic plate and a conductor, placing the conductor between the first ferromagnetic plate and the second ferromagnetic plate, adhering the first ferromagnetic plate to the second ferromagnetic plate with a composition comprising an adhesive and a magnet powder to form magnetic gaps, and magnetizing the inductor.
An inductor 10, 100, 120 includes an inductor body 12, 102, 124 having a top surface 14 and a first 18 and second 20 opposite end surfaces. There is a void 28 through the inductor body between the first and second opposite end surfaces. A thermally stable resistive element 30, 84, 98, 122 positioned through the void and turned toward the top surface to forms surface mount terminals 32, 34, 38, 40, 126, 128 which can be used for kelvin type sensing. Where the inductor body is formed of a ferrite, the inductor body includes a slot 26. The resistive element may be formed of a punched resistive strip 84 and provide for a partial turn or multiple turns 94. The inductor may be formed of a distributed gap magnetic material 124 formed around the resistive element . A method for manufacturing the inductor includes positioning an inductor body 12, 102, 124 around a thermally stable resistive element such that terminals of the thermally stable restistive element extend from the inductor body.
An inductor 10, 100, 120 includes an inductor body 12, 102, 124 having a top surface 14 and a first 18 and second 20 opposite end surfaces. There is a void 28 through the inductor body between the first and second opposite end surfaces. A thermally stable resistive element 30, 84, 98, 122 positioned through the void and turned toward the top surface to forms surface mount terminals 32, 34, 38, 40, 126, 128 which can be used for kelvin type sensing. Where the inductor body is formed of a ferrite, the inductor body includes a slot 26. The resistive element may be formed of a punched resistive strip 84 and provide for a partial turn or multiple turns 94. The inductor may be formed of a distributed gap magnetic material 124 formed around the resistive element . A method for manufacturing the inductor includes positioning an inductor body 12, 102, 124 around a thermally stable resistive element such that terminals of the thermally stable restistive element extend from the inductor body.
A flux-channeled high current inductor (30) includes an inductor body (12, 14) having a first end and an opposite second end and a conductor (32, 34) extending through the inductor body. The conductor includes a plurality of separate channels through a cross-sectional area of the inductor body thereby directing magnetic flux (50, 52, 54, 56) inducted by a current (36, 40) flowing through the conductor into two or more cross-sectional areas and reducing flux density of a given single area. The inductor body may be formed of a first ferromagnetic plate (12) and a second ferromagnetic plate (14). The inductor may be formed from a single component magnetic core and have one or more slits (16) to define inductance. The inductor may be formed of a magnetic powder. A method is provided for manufacturing flux-channeled high current inductors.
H01F 17/06 - Inductances fixes du type pour signaux avec noyau magnétique avec noyau refermé sur lui-même, p. ex. tore
H01F 27/255 - Noyaux magnétiques fabriqués à partir de particules
H01F 41/02 - Appareils ou procédés spécialement adaptés à la fabrication ou à l'assemblage des aimants, des inductances ou des transformateursAppareils ou procédés spécialement adaptés à la fabrication des matériaux caractérisés par leurs propriétés magnétiques pour la fabrication de noyaux, bobines ou aimants
