Abstract: A non-contact power-feeding device comprises: a power transmitting unit that includes a first antenna coil, an oscillator and a driver that enables generation of an AC magnetic field via the first antenna coil based upon a signal provided by the oscillator; and a power receiving unit that includes a second antenna coil that is magnetically coupled with the first antenna coil, wherein the first antenna coil comprises: a flat-plane spiral resonance coil wound with a plurality of turns; and a flat-plane spiral power-feeding coil that is wound with a plurality of turns outward relative to the resonance coil so as to surround the resonance coil, and is magnetically coupled with the resonance coil.

Abstract: A system and method is disclosed for integrating inductive power outlet functionality to provide power transfer to electrical devices, as an in-surface wireless charging system, embedded into a host such as a furniture item. An inductive power outlet may include a body casing for containing a primary inductor a driving unit and a fastening mechanism. The body casing may have dimensions suitable for introduction into a passageway through a plate of the item of furniture. The fastening mechanism may be utilized to secure the body casing to the plate of the item of furniture.

Abstract: A system and method for demodulating a wireless power signal onto which binary data has been modulated involves processing the wireless power signal with analog circuitry to produce a modified power signal in accordance with the type of demodulation used, periodically capturing digital samples of the modified power signal to produce a series of digital samples, applying, with an MCU, at least two digital filtering algorithms to the digital samples to determine transitions associated with the modulation, and recovering, with the MCU, the binary data as a function of the determined transitions. The demodulator is applicable to bidirectional power transfer capable devices and includes algorithms that can be applied similarly to both ASK and FSK demodulations with little or no modification.

Abstract: In a core for a rotary electric machine, first end portions of back yoke portions are linked to second end portions of back yoke portions of adjacent core segments so as to be rotatable around pivot portions. Each of the core segments is configured by alternately laminating first core segment sheets and second core segment sheets. The pivot portions are constituted by interfitting protruding portions that are formed on the first core segment sheets. The core segments are displaceable relative to the adjacent core segments between a contracted position in which spacing between the magnetic pole tooth portions is contracted and an expanded position in which spacing between the magnetic pole tooth portions is expanded, when the core segment linked body is opened out rectilinearly.

Abstract: The invention provides a synchronous-generator stator, comprising a stator ring, a stator core, a circumferential gap between the stator ring and the stator core, and a plurality of decoupling units in the gap, wherein the decoupling unit has a first plate, which is matched to a contour of the stator core, and has a second plate, which is matched to the contour of the stator ring, wherein a mat, having a cavity and an inlet valve, is provided between the first and the second plate.

Abstract: The fixing resin composition for use in a rotor includes a thermosetting resin (A) containing an epoxy resin, a curing agent (B), and an inorganic filler (C), wherein the content of the inorganic filler (C) is equal to or more than 50% by mass, based on 100% by mass of the total content of the fixing resin composition.

Abstract: One embodiment of an enhanced flux-density magnet comprises a magnetic material with two magnetic poles and one magnetic pole-area smaller than the other magnetic pole-area. Because the magnetic field at both pole-areas is equal but the magnetic pole-areas are unequal, the magnetic flux-density is proportionally greater at the magnetic pole with a smaller area than the magnetic pole with the larger area and greater than if the magnetic pole-areas were equal.

Abstract: A high torque axial gap electric motor includes rotor and stator disks containing magnets fixed to their respective faces, where the magnets contain triangular ridges arranged in concentric circles. The face of each rotor magnet ridge is parallel to the face of a stator magnet ridge, creating an air gap with a cross-section that has a zigzag appearance. The preferred embodiment uses a three-phase motor design with multiple rotors and stators and permanent magnets.

Abstract: A coolant flow path structure which cools a rotor is configured of a first coolant flow path forming a radial coolant flow path of the rotor and a second coolant flow path communicating with the first coolant flow path and forming an axial coolant flow path of the rotor, and a negative pressure structure, which brings an exist of the coolant flow path structure into a negative pressure as a result of a rotation of the rotor, is provided at the exit of the second coolant flow path.

Abstract: In an armature coil according to the present invention and, more particularly, in an armature coil including a plurality of coil conductors wound around a plurality of slots which are formed in a stator core and opened on the radially inner side, the circumferential width of the plurality of the coil conductors is formed in a substantially trapezoidal shape which gets narrower toward the radially inner side and the cross-sectional areas of the plurality of the coil conductors in the slot are each substantially the same and the circumferential width thereof is formed narrower as the coil conductor is arranged toward the radially inner side; and one coil conductor is formed in a convex shape and another coil conductor is formed in a concave shape along the convex shape.

Abstract: A claw rotor (2) provided with an insulator (11) for a field coil (10) and a rotary electric machine equipped with such a rotor, the insulator comprising a plurality of projecting petals (121, 131) intended to engage with the inner inclined periphery of a claw (9). Each of the petals (121, 131) includes: a base (122, 132) solidly connected to an associated cheek (120, 130), side edges (123, 133), and an end (124, 134). The claw-pole rotor (2) is wherein each petal (121, 131) has a thickness (e) at the side edges (123, 133) which increases from the base (122, 132) to the end (124, 134).

Abstract: A motor includes a housing, a back cover, a brush card, a brush, and a connector member. The back cover includes a first rear wall portion and a first peripheral wall portion. The first peripheral wall portion includes a through-hole and a cut-out. The through-hole vertically penetrates through the first peripheral wall portion at or near a lower end portion of the first peripheral wall portion. The cut-out is disposed farther on an upper side than the through-hole. The connector member is fitted into the cut-out. An outer surface of the connector member is provided with a flow path groove that extends in both peripheral and axial directions. The motor includes a flow path surface on an inner surface of the back cover. The flow path surface continues from a portion that opposes the flow path groove on a lower side of the flow path groove to the through-hole.

Abstract: The present disclosure provides a driving device including a stator, a rotor, a housing, a controller, and a sealing member. The sealing member includes a base and protrusions. The protrusion includes a cylindrical portion, a cover portion, a first annular protrusion, and a second annular protrusion. The first and second annular protrusions outwardly protrude from the cylindrical portion. The first annular protrusion is fit in a fit region of the lead hole in a compressed state. The second annular protrusion is offset from the fit region toward the controller.

Abstract: An electronic package adapted for connection to a rear frame member of an electric machine of liquid and/or air-cooled type. The electronic package includes a cooling tower having opposite first and second axial ends spaced along a package central axis. The cooling tower includes a metallic wall extending about the package central axis to define a radially outer wall surface. The cooling tower is at ground potential and defines a heat sink. The electronic package also includes a plurality of power modules mounted in conductive thermal communication to the cooling tower at positions on the radially outer wall surface. Heat transference to the cooling tower from each power module occurs along a respective primary cooling path. Transference along the primary cooling paths of heat from the cooling tower includes thermal convection to air and/or liquid. An electric machine of liquid and/or air-cooled type including an electronic package is also disclosed.

Abstract: A motor includes a base, a winding assembly and a rotor. The base includes a pivoting portion. The winding assembly includes a support. The support includes at least one coil supporting portion and a circuit supporting portion connected to the at least one coil supporting portion. A coil is arranged on each of the at least one coil supporting portion. A circuit is arranged on the circuit supporting portion and electrically connected to the coil or coils. A folding portion is arranged between the at least one coil supporting portion and the circuit supporting portion. The circuit supporting portion and the at least one coil supporting portion are folded and stacked together via the folding portion. The rotor is rotatably coupled to the pivoting portion of the base. Due to the arrangement of the folding portion, a radial width of the motor is efficiently reduced.

Abstract: A power tool with a combined printed circuit board (PCB) that reduces internal wiring of the power tool and provides a large amount of air flow to internal components. In some instances, the combined PCB has a surfboard shape and includes a motor control unit and power switching elements (Field Effect Transistors or FETs). The combined surfboard PCB is located above the trigger, but below the motor and drive mechanism. In other instances, the combined PCB has a doughnut shape and is located coaxially with a motor shaft. The combined PCB may be positioned between a doughnut-shaped control PCB and the motor.

Abstract: A rotating electrical machine, in particular to an alternator (A) or to an alternator-starter, for a motor vehicle, comprising: a rotor (2) supporting a front fan (23) at the front and a rear fan (24) at the rear, the rotor being rotatable about an axis of rotation, a stator (4) comprising a stator body and at least one winding placed on the stator body, the winding forming front and rear chignons on either side of the stator body, and a casing (1) in which the stator and the rotor are placed.

Abstract: A mechanically commutated electric motor is at least partially arranged in a closure apparatus for a housing. The closure apparatus includes at least a first rod-like throttle coil and a second rod-like throttle coil which are wound in opposite directions with coil wire and which are arranged parallel to one another. The first throttle coil is electrically directly coupled to a first coupling element provided for electrical coupling to the mechanically commutated electric motor, and the second throttle coil is electrically directly coupled to a second coupling element provided for electrical coupling to the mechanically commutated electric motor, such that, when the mechanically commutated electric motor is connected to the coupling elements and the mechanically commutated electric motor is operated, the magnetic fluxes (Phi1, Phi2) in the first throttle coil and second throttle coil at least partially compensate one another.

Abstract: The present invention relates to a protection system with a protection relay and at least one measurement sensor to protect a permanent magnet generator having a plurality of stator windings, each of said stator windings having a first end and a second end. If the stator windings are connected in a wye coupling, they are, in a set of three stator windings, commonly coupled in a star point at the first end of the windings, or if the stator windings are connected in a delta coupling, they are, in a set of three stator windings, commonly connected in a ring to each other. In addition, the at least one measurement sensor is arranged for measuring current through at least one of the stator windings at the star point side or within the ring connection and for communicating with the protection relay. The invention also relates to a method of protecting a permanent magnet generator.

Abstract: A brushless DC motor includes a stator formed of a lamstack including a plurality of stacked laminations. The stator includes a plurality of radially extending core members and a circumferential wall. An intersection of each of the plurality of radially extending core members with the circumferential wall defines a flux null location, and a portion of the lamstack defines a first opening located at one of the flux null locations. The brushless DC motor includes a printed circuit board including a second opening and a grounding member including a first section received in the first opening of the stator and a second section received in the second opening of the printed circuit board to create a grounding path.

Abstract: A skew correction device is provided that can easily correct the skew in the circumferential direction of the stator core arising due to insertion of electrical conductors into each slot and twisting and bending of the leading ends thereof in the circumferential direction. A skew correction device (10) for stator cores (2), includes: a support member (71) capable of supporting from outwards a protrusion (5) formed by the plurality of projecting parts (21) aligning; a first pressurizing mechanism (72) for pressing the support member (71) towards an inner side in a radial direction; and a rotation mechanism (73) for correcting skew in the circumferential direction, by causing the support member (71) to rotate in a direction in which the skew in the circumferential direction is corrected by way of a rotating shaft (731), in a state supporting the protrusion (5) from outwards by pressing the support member (71).

Abstract: A high rotor pole switched reluctance machine (HRSRM) employs an axial and radial mirroring concept and is represented by a first Multiple Rotor Pole (MRP) formula and second Multiple Stator Pole (MSP) formula. A multiple rotor HRSRM comprises at least two rotors each having a plurality of rotor poles and at least one stator having a plurality of stator poles. The at least two rotors and the at least one stator are positioned about a central axis with the stator placed between, and laterally adjacent to the rotors. A multiple stator HRSRM comprises at least two stators having a plurality of stator poles and at least one rotor having a plurality of rotor poles. The at least two stators and at least one rotor are positioned about a central axis with the rotor placed between and laterally adjacent to the stators.

Abstract: A voltage converter comprises a second controller as a power switch of the secondary side of the transformer for comparing a detection voltage representing an output voltage and/or load current with a first reference voltage and generating a control signal, and a coupling element for transmitting the control signal generated by the second controller to the first controller on the primary side of the transformer enabling the first controller to generate a first pulse signal driving the power switch to control the on/off state of the primary side winding.

Abstract: According to some aspects of the present disclosure, isolated power supplies and corresponding control methods are disclosed. Example isolated power supplies include a transformer, at least one power switch coupled to the transformer, a controller, an output terminal, and a feedback circuit coupled to the output terminal to sense the output voltage and compare the sensed output voltage to a voltage reference. The power supplies include a fault detection circuit to sense the output voltage, compare the sensed output voltage to a fault reference, and modify a feedback signal when the sensed output voltage exceeds the fault reference. The power supplies also include a single isolation device coupled between the feedback circuit and the controller. The controller is operable to control the power switch based on the feedback signal and to detect a fault condition when a slew rate of the feedback signal exceeds a fault threshold slew rate value.

Abstract: Disclosed in the present invention is a four-port power electronic transformer based on a hybrid modular multilevel converter (MMCs). The four-port power electronic transformer includes a hybrid MMC, direct current (DC)/DC converters, and an inverter. Each DC/DC converter includes a front stage part, a high frequency transformation part and a back stage part.

Abstract: A protection method in a distributed power system including of DC power sources and multiple power modules which include inputs coupled to the DC power sources. The power modules include outputs coupled in series with one or more other power modules to form a serial string. An inverter is coupled to the serial string. The inverter converts power input from the string and produces output power. When the inverter stops production of the output power, each of the power modules is shut down and thereby the power input to the inverter is ceased.

Abstract: The present disclosure provides a method for controlling soft start of a switching rectifier, which comprises: acquiring an external environmental parameter of the switching rectifier and a power supply characteristic parameter of an object to be powered, establishing a voltage start strategy and/or a current start strategy for the switching rectifier according to the external environmental parameter and the power supply characteristic parameter, and controlling a voltage and/or a current of the switching rectifier to start to a full-load voltage and/or a full-load current according to the voltage start strategy and/or the current start strategy. The present disclosure further provides a device for controlling soft start of a switching rectifier. The technical scheme of the present disclosure is able to provide a suitable voltage and/or current start approach for a switching rectifier according to power supply requirements of an object to be powered and operating environment of the switching rectifier.

Abstract: Apparatus and methods are provided for starting up an isolated power converter. In an example, an integrated circuit for controlling an isolated power converter can include a control circuit configured to control a duty cycle of a primary switch according to an startup schedule during an initial interval of a start-up period of the isolated power supply, and to switch to a closed-loop control mode of the primary switch during a second interval of the start-up period after a voltage level of the DC output power signal is above a start-up threshold.

Abstract: One example discloses an apparatus for charge recycling between a first power-domain operating at a first voltage and a second power-domain operating at a second voltage, including: a first power-delivery circuit configured to supply the first voltage to the first power-domain; and a second power-delivery circuit coupled to receive power from both the first power-delivery circuit and the first power-domain; wherein the second power-delivery circuit is configured to supply the second voltage to the second power-domain.

Abstract: A capacitive isolation system, capacitive isolator, and method of operating the same are disclosed. The capacitive isolation system is described to include a first semiconductor die and a second semiconductor die each having capacitive elements established thereon and positioned in a face-to-face configuration. An isolation layer is provided between the first and second semiconductor die so as to establish an isolation boundary therebetween. Capacitive coupling is used to carry information across the isolation boundary.

Abstract: A high voltage generator includes a voltage converting device that increases a level of an input voltage and outputs an output voltage having a level higher than the level of the input voltage. The high voltage generator further includes a precharge controller that gradually increases the level of the input voltage up to a level of an external voltage based on a reference voltage and the output voltage.

Abstract: A control circuit according to an embodiment of the present invention is configured to control a switching element of a switching power supply. The control circuit includes a comparator having a first input terminal configured to receive an output voltage of the switching power supply. The comparator has a second input terminal that is connectable to a positive terminal of a reference voltage source. The comparator has an output. The output brings the reference voltage to a first voltage while the output signal takes a first voltage level. The output brings the reference voltage to a second voltage while the output signal takes a second voltage level. The constant voltage source has a positive terminal connected to a negative terminal of the reference voltage source and a ground of the comparator.

Abstract: Systems and methods are provided for regulating a power converter. An example system controller includes: a driver configured to output a drive signal to a switch to affect a current flowing through an inductive winding of a power converter, the drive signal being associated with a switching period including an on-time period and an off-time period. The switch is closed in response to the drive signal during the on-time period. The switch is opened in response to the drive signal during the off-time period. A duty cycle is equal to a duration of the on-time period divided by a duration of the switching period. One minus the duty cycle is equal to a parameter. The system controller is configured to keep a multiplication product of the duty cycle, the parameter and the duration of the on-time period approximately constant.

Abstract: A method and apparatus for estimating capacitor current in a feed-forward control system includes a circuit that conducts a current through an output capacitor to ground and estimates a current magnitude for the current in an output current estimator. The current estimator generates a voltage that corresponds to the estimated current magnitude by creating a voltage drop across an estimator circuit capacitor that equals a voltage drop across the output capacitor, by creating a voltage drop across an output of an RC network of the estimator circuit that equals or is proportional to a voltage drop across the output capacitor due to parasitic inductance and parasitic resistance of the output capacitor. The voltage drop across the output of the RC network of the estimator circuit is proportional to current flowing through the parasitic inductance and resistance of the output capacitor.

Abstract: A power supply system includes multiple power converters, each having an input and an output. The outputs of the power converters are connected together in parallel to produce a single system output. There is a shared command bus that is coupled to each one of the power converters. A control loop in (associated with) a designated one of the power converters is operable to generate a current command signal to be output onto the shared command bus. All of the parallel connected power converters in the power supply system are configured to receive the current command signal from the shared command bus and to adjust an amount of electrical current being supplied by that power converter in response to the current command signal.

Abstract: A load driving device disclosed in the specification includes a power supply circuit for supplying to a load an output voltage converted from an input voltage, a detection voltage generation circuit for generating a detection voltage which varies depending on a magnitude of a voltage drop which across the load, and a control circuit for controlling the power supply circuit so that it performs output feedback control of the output voltage, on the basis of the detection voltage.

Abstract: In a power converter, a first electrical path connects between the series resonant circuit and a selected terminal from the high- and low-side input and output terminals of the power converter. An auxiliary diode is provided on one of the series resonant circuit and the first electrical path. An auxiliary switch, when turned on, causes an inductor current to flow through the auxiliary diode to the resonance inductor, thus storing electromagnetic energy into the resonance inductor, and causes the resonance inductor and the capacitance component of the series resonant circuit to resonate with each other. A second electrical path bypasses the auxiliary switch for flow of the inductor current. A discharge unit is provided on the second electrical path. The discharge unit is activated to discharge the electromagnetic energy stored in the resonance inductor via the second electrical path.

Abstract: Devices and methods are provided where a feedback is provided from a control terminal of a first switch, and a second switch is controlled based on the feedback.

Abstract: Disclosed herein are an apparatus for controlling a switch-mode power supply, and a method of operating the same. In an embodiment, it is determined whether or not a current of an inductor of the switching power supply has become less than or equal to a predetermined value. In an embodiment, a variable reference voltage is adjusted based on the current of the inductor and an output voltage. In an embodiment, a switch is turned off based on the inductor current, the output voltage, and the variable reference voltage.

Abstract: A switching power supply includes a plurality of parallel branches, each parallel branch including two serially connected controllable switches and a coil connected between the two switches and an output node, a capacitor connected between the output node of the parallel branches and ground; and a controller configured to switch the two serially connected controllable switches of each parallel branch such that a first switch of a parallel branch is switched from a conducting state to a non-conducting state when a current flowing through a coil of the parallel branch reaches a first current value larger than 5 A, and such that the second switch is switched from a conducting state to a non-conducting state when the current flowing through the coil of the parallel branch reaches a second current value smaller than 0 A.

Abstract: A single inductor positive and negative voltage output device, which not only reduces a chip area, but also meets mutual independent application needs of positive and negative voltage output load currents, which includes an inductor L, one end of the inductor L is connected to the drain of a first PMOS power switch M1 and to the drain of a third NMOS power switch M3 respectively, the other end of the inductor L is connected to the drain of a second NMOS power switch M2 and to the source of a fourth PMOS power switch M4 respectively, the gates of M1, M2, M3 and M4 are respectively connected to a drive circuit (1), the source of M1 is connected to a power supply terminal VIN, the source of M2 is connected to a ground terminal (6), the source of M3 is connected to a negative voltage output end VON, the drain of M4 is connected to a positive voltage output end VOP, the negative voltage output end VON is connected to ground terminal by a negative terminal capacitor CON, the positive voltage output end VOP is conne

Abstract: An electronic circuit device includes a board and a transformer that is provided at the board and that has a primary winding member and a secondary winding member. The primary winding member is configured with a primary winding that is provided at the board and a primary side element that is electrically connected to the primary winding member. The secondary winding member is configured with a secondary winding that is provided at the board and a secondary side element that is electrically connected to the secondary winding member.

Abstract: An electronic converter may include transformer with a primary winding and a secondary winding, wherein the primary winding is coupled to an input for receiving a power signal, and wherein the secondary winding is coupled to an output including a positive terminal and a negative terminal for providing a power signal. The converter moreover may include an electronic switch arranged between the input and the primary winding, wherein the electronic switch is configured to control the current flow through the primary winding. Specifically, the converter may include a snubber circuit arranged between the secondary winding and the output.

Abstract: Methods for supplying a synchronous rectifier (SR) driver circuit and supply voltage generation circuits for a SR driver circuit are described. In one embodiment, a method for supplying a SR driver circuit involves receiving a converted voltage from a secondary winding of a transformer and generating a supply voltage for the SR driver circuit based on the converted voltage, where the supply voltage is higher than an output voltage of the transformer that is generated using the secondary winding. Other embodiments are also described.

Abstract: In accordance with an embodiment, a method of operating a power supply includes detecting a loss of at least one of an AC input voltage an AC input power at an input of the power supply, and increasing a switching frequency of the power supply upon detection of the loss of the AC input voltage or AC input power.

Abstract: According to some embodiments, an electronic drive circuit is disclosed. The electronic drive circuit includes an energy storage device and a first bridge circuit coupled to the energy storage device. The first bridge circuit includes at least one leg having two switches. The electronic drive circuit also includes a transformer. The transformer includes a first winding coupled to the first bridge circuit and a second winding coupled to the energy storage device through a center tap. The electronic drive circuit further includes a second bridge circuit coupled to the second winding of the transformer. The second bridge circuit includes a pair of switches operable to conduct in both directions and block voltage in both directions.

Abstract: A direct current (DC) power supply, including a plurality of first printed circuit boards (PCBs) disposed on a primary side of the DC power supply, a plurality of alternating current (AC)/DC converter circuits having different potentials, each formed on a different one of the plurality of first PCBs, a second PCB disposed on a secondary side of the DC power supply, and a plurality of DC/DC converter circuits having an equal potential disposed on the second PCB. The AC/DC converter circuits are electrically connected in series and connected to an AC input of the DC power supply. The DC/DC converter circuits are electrically connected in parallel and connected to a DC output of the DC power supply.

Abstract: A resonant control device and a resonant control method thereof controls a resonant converter connected with a load. An output voltage is applied across the load. Firstly, a setting voltage is used to perform voltage compensation on the output voltage to generate a control value. Then, pulse modulation signals are generated according to the control value and a switch value, so as to drive the resonant converter to regulate the output voltage. Each pulse modulation signal has the maximum frequency and the minimum frequency. The switch value is equal to the minimum frequency divided by the maximum frequency and less than 0.5. Finally, the process determines whether the control value is less than the switch value. If the answer is yes, PWM signals as the pulse modulation signals are generated, and their frequency is less than the maximum frequency to increase a lower-limit range of the output voltage.

Abstract: A semiconductor device, for controlling a power supply which generates and outputs a driving pulse, includes: a clock generating circuit with an oscillating circuit in which a frequency can be changed and which generates a clock signal; a voltage/electric current control circuit which provides timing to turn off a switching element; a setting terminal to provide setting information from outside; a switch between a first power supply terminal and a second power supply terminal; and an internal power supply voltage control circuit which controls the switch. When voltage of the setting terminal is lower than a first voltage value, the device advances to a first stop mode in which output of a driving pulse is stopped. When voltage of the setting terminal is higher than the first voltage value, the device advances to a second stop mode in which the output of the driving pulse is stopped.

Abstract: The disclosure relates to a control circuit, a control method and a flyback converter of primary-side feedback control including the control circuit. On the basis of the current sampling signal feedback, the flyback converter of primary-side feedback control is controlled to operate in a constant on time mode when the input voltage is large, and is controlled to operate in a peak current mode when the input voltage is close to a valley. Thus, the peak value of the primary-side current may not become too small because of a decreased input voltage, further avoiding occurrence of an error sampling after a blanking time due to excessive variations in demagnetization time.