Abstract: The invention provides a series resonant LLC power converter unit to provide a plurality of power outputs. The power converter unit comprises a plurality of transformers arranged such that at least one primary winding of each transformer is connected in parallel and configured to provide a power output. An inductive element is positioned in parallel with a single primary winding selected from said plurality of transformers, wherein the inductive element and single primary winding restricts variation in inductance for said plurality of transformers and power outputs in operation.

Abstract: A wireless power transmitter includes: a power supply configured to supply a driving power; a first power transmitter including first bridge switching elements forming a first bridge circuit, and configured to receive the driving power to transmit a first power, wherein a magnitude of a first input voltage applied to the first bridge circuit is determined by a duty of at least one of the first bridge switching elements; a second power transmitter including second bridge switching elements forming a second bridge circuit, and configured to receive the driving power to transmit a second power, wherein a magnitude of a second input voltage applied to the second bridge circuit is determined by a duty of at least one of the second bridge switching elements; and a controller configured to output first and second power transmitting control signals respectively controlling the first bridge switching elements and the second bridge switching elements.

Abstract: An inverting apparatus comprises: a DC port; an AC port; five switches; a first capacitor coupled between the first terminal of the second switch and the second terminal of the fourth switch; and a free-wheeling element coupled between the second terminal of the third switch and the second terminal of the fifth switch; wherein the five switches are controlled so that the device can switch among a plurality of operating modes and transmit active or reactive power to a power grid.

Abstract: A direct current (DC)-DC converter is for a vehicle for converting a first voltage output of a first battery to a second voltage output of a second battery. The DC-DC converter includes a transformer, at least one switch, at least one rectifying diode, and a snubber circuit. The transformer is configured to transform the first voltage to the second voltage. The at least one switch is configured to control a first current input to the transformer from the first battery. The at least one rectifying diode is configured to rectify an alternate current (AC) output from the transformer. The snubber circuit is configured to prevent overvoltage from being applied to the at least one rectifying diode.

Abstract: A bi-directional variable voltage converter transfers power between a traction battery and an electric machine inverter. The bi-directional variable voltage converter includes a capacitor, two power module phase legs, and an air-gapped transformer with three windings and no more than four terminals. A first of the windings defines a first terminal and a second terminal of the no more than four terminals. The first terminal is directly electrically connected with a positive terminal of the traction battery and the second terminal is directly electrically connected with a positive terminal of the capacitor and a junction between the second and third windings. A second of the windings defines a third terminal of the no more than four terminals directly electrically connected with one of the power module phase legs. A third of the windings defines a fourth terminal of the no more than four terminals directly electrically connected with the other of the power module phase legs.

Abstract: An LLC converter includes a transformer that includes a primary winding and a secondary winding, a resonant stage that includes the primary winding, a switching stage that includes switches and that is connected to an input voltage and the resonant stage, a rectifying stage that is connected to the secondary winding and that provides an output voltage, and a controller that senses the output voltage and that controls switching of the switches based on proportional-integral control of the output voltage to reduce errors in the output voltage with respect to a DC voltage and based on quasi-resonant control of the output voltage to reduce errors in the output voltage with respect to a range of voltages with a frequency bandwidth.

Abstract: An apparatus includes a string of serially-connected energy storage devices, a string of serially-connected windings on at least one core and having a first medial node coupled to a first medial node of the string of serially-connected energy storage devices, and first and second switches configured to connect first and second end nodes of the string of serially-connected storage devices to respective first and second end nodes of the string of serially-connected energy storage devices. A control circuit is configured to operate the first and second switches at the same duty cycle.

Abstract: An apparatus to provide welding power. The apparatus may include a direct current-alternate current (DC-AC) power converter to output a primary current and a transformer stage. The transformer stage may include at least one power transformer to receive the primary current from the (DC-AC) power converter on a primary side of the transformer stage and to output a first voltage through a first rectifier and a first set of secondary windings disposed on a secondary side of the transformer stage. The transformer stage may further include an auxiliary set of secondary windings disposed on the secondary side to output a second voltage. The apparatus may also include a pair of active unidirectional switches disposed on the secondary side to receive the second voltage from the auxiliary set of secondary windings.

Abstract: Disclosed is a magnetic induction power supply device, which switches the unit coil having the smallest number of windings to a rectification unit at the initial operation, thereby preventing the parts damaged due to an excessive inrush voltage. The disclosed magnetic induction power supply device switches the unit coil having the smallest number of windings to the rectification unit when emergency power is applied from a first power supply unit or a second power supply unit. The second power supply unit can supply the power source induced in the unit coils to a sensing unit as the emergency power.

Abstract: An apparatus to provide welding power. The apparatus may include a direct current-alternate current (DC-AC) power converter to output a primary current and a transformer stage. The transformer stage may include at least one power transformer to receive the primary current from the (DC-AC) power converter on a primary side of the transformer stage and to output a first voltage through a first rectifier and a first set of secondary windings disposed on a secondary side of the transformer stage. The transformer stage may further include an auxiliary set of secondary windings disposed on the secondary side to output a second voltage. The apparatus may also include a pair of active unidirectional switches disposed on the secondary side to receive the second voltage from the auxiliary set of secondary windings.

Abstract: A power conversion device includes a power conversion unit that converts power into AC power having a predetermined frequency and voltage through a switching operation of a plurality of switching elements, a DC unit including a capacitor and a reactor, and a controller that controls the switching operation. The capacitor smooths a ripple caused by the switching operation in the power conversion unit. The controller monitors an indicator value correlated with a disturbance that distorts an input current supplied to the power conversion unit, and compensates a manipulated variable of control of the switching operation in the power conversion unit in accordance with at least a frequency component closest to a resonant frequency of the DC unit among a plurality of frequency components. The frequency components are included in variations in the indicator value and correspond to integral multiples of a power source frequency of an AC power source.

Abstract: Encapsulated electronic modules having complex contact structures may be formed by encapsulating panels containing a substrate comprising pluralities of electronic modules delineated by cut lines and having conductive interconnects buried within terminal holes and other holes drilled in the panel within the boundaries of the cut lines. Slots may be cut in the panel along the cut lines. The interior of the holes, as well as surfaces within the slots and on the surfaces of the panel may be metallized, e.g. by a series of processes including plating. Solder may be dispensed into the holes for surface mounting. Two or more panels may be stacked prior to singulation to form module stacks. Multi-cell converters having a large cell pitch may be combined with an interconnection module to provide vertical power delivery to semiconductor devices through a semiconductor power grid having a small pitch. The converters and interconnection modules may be fabricated in panels and stacked prior to singulation.

Abstract: A control unit 10 performs switching control of IGBTs 5a to 5d, 8b, and 8d, makes IGBTs 8a and 8c an OFF state, changes ON-duty of the IGBTs 5a to 5d, 8b, and 8d, and thereby adjusts first output power output from a secondary side converter 200. The IGBTs 5b, 5c, and 8b are synchronized together and switched in a prescribed cycle, and the IGBTs 5d and 8d are switched in a state where a phase is shifted by half a cycle with respect to the IGBTs 5b, 5c, and 8b (in a state where the phase is shifted by 180 degrees).

Abstract: A bidirectional phase-shift full bridge converter includes a primary side having switch devices forming a full-bridge power stage and a first inductor connected to the power stage, a secondary side having switch devices forming a power stage and a second inductor connected to that power stage, a transformer, and a controller for controlling switching of the switch devices to transfer energy from the primary to secondary side in a first mode, and to transfer energy from the secondary to primary side in a second mode. In the second mode, the controller controls switching of the switch devices to pre-charge the first inductor at, near or above a current level of the second inductor prior to transferring energy from the secondary to primary side, so that the current in the first inductor is at, near or above the current in the second inductor at the beginning of the energy transfer.

Abstract: A multi-die health monitoring device: sets, at a given current provided to the load by the group of dies, one of the dies in a non-conducting state (NCS), obtains, when the die is in the NCS, a signal that is representative of the temperature of the die and determines the temperature of the die, obtains, when the die is in the NCS, a signal that is representative of an on-state voltage (OSV) of the die and determines the OSV of the die, retrieves in a table stored in a memory of the multi-die health monitoring device, an OSV that corresponds to the given current and the determined temperature of the die, notifies that the multi-die power module has to be replaced, if the difference between the determined OSV of the die and the retrieved OSV is equal or upper than a predetermined value.

Abstract: According to one aspect, embodiments of the invention provide a power system comprising an input power distribution circuit including a plurality of power connections, a first power supply coupled to a first power connection of the plurality of power connections, a scalable battery bank including at least a first battery module coupled to a second power connection of the plurality of power connections, the first battery module including a first battery and a first battery charger, the first battery charger and the first power supply being removable and interchangeable, and an output power distribution circuit coupled to the first power supply and the first battery and configured to provide output power derived from at least one of the first power supply and the first battery.

Abstract: The invention concerns a method for charging an electrical energy storage unit, in particular installed in a vehicle, from a continuous charging terminal, using a DC/DC voltage converter to adapt the voltage between said continuous charging terminal and said electrical energy storage unit, said DC/DC voltage converter comprising at least two interleaved cells operating out of phase, each cell having respective switches; said method comprising control of the switches of said DC/DC voltage converter by pulse width modulation with a duty cycle to adapt the voltage between said continuous charging terminal and the electrical energy storage unit, said duty cycle having a given value ?v that is substantially constant over several interleaving cycles.

Abstract: In at least one embodiment, a charging apparatus for a vehicle is provided. The apparatus includes a power converter having a primary stage, a first secondary stage, and a second secondary stage. The primary stage is configured to receive an incoming voltage to generate a first input voltage. The first secondary stage includes a first plurality of electrical components configured to generate a first portion of an output voltage. The second secondary stage is in series with the first secondary stage and includes a second plurality of electrical components configured to generate a second portion of the output voltage. Each of the first plurality of electrical components and the second plurality of electrical components is rated to a voltage rating that is less than a total sum of the first portion and the second portion of the output voltage.

Abstract: A power switching circuit includes a transformer, a rectifying unit, a first switching unit, a second switching unit and a feedback unit. The transformer includes a central-tapped terminal. The transformer is configured to output a first power signal. The rectifying unit is coupled to the transformer. The rectifying unit receives the first power signal and outputs a second power signal to a load. The first switching unit is coupled to the central-tapped terminal of the transformer. The second switching unit is coupled to the rectifying unit and the first switching unit. The feedback unit is configured to receive the second power signal and control the first switching unit and the second switching unit.

Abstract: Disclosed is a high-voltage generator for an x-ray apparatus. The generator comprises a voltage multiplier having a high-voltage output terminal and first and second alternating-current input terminals, an output transformer coil (12) having first and second output terminals respectively electrically connected to the first and second input terminals of the voltage multiplier, and an input transformer coil (11) having first and second input terminals and being arranged coaxially with and inductively coupled to the output transformer coil. The input and output transformer coils are relatively axially movable. Disclosed is also an x-ray apparatus using the high-voltage generator, a method of configuring a high-voltage generator and a method of configuring a high-voltage apparatus.

Abstract: A power converter device includes a first phase-shift full-bridge circuit, a second phase-shift full-bridge circuit, a detector circuit, and a control circuit. The control circuit controls the first phase-shift full bridge circuit and the second phase-shift full bridge circuit. The control circuit disables the second phase-shift full-bridge circuit when the output current is less than a first predetermined value. The control circuit enables the second phase-shift full-bridge circuit when the output current is equal to or greater than the first predetermined value. The control circuit controls a synchronous switching circuit of the second phase-shift full-bridge circuit to operate in a traditional control mode when the output current is equal to or greater than a second predetermined value and a duty cycle of a phase-shift switching circuit is equal to or greater than a third predetermined value. The second predetermined value is greater than the first predetermined value.

Abstract: A power converter for an electric power system comprises a switching circuit (102) for supplying, in a first operating mode of the power converter, voltages for driving a rotating electric machine. The power converter comprises a contactor system (110) and a controller (109) for using, in a second operating mode of the power converter, the switching circuit and at least one of windings (115) of the rotating electric machine as a voltage-decreasing direct voltage converter between direct voltage terminals of the power converter. Therefore, the switching circuit of the power converter can be utilized both for driving the rotating electric machine and, for example, for charging a battery element connected to a direct voltage terminal of the power converter.

Abstract: A charging circuit and a mobile terminal are provided. The charging circuit is coupled between a charging interface and a battery. The charging circuit includes a first circuit, a magnetic coupling element, and a second circuit connected in series between the charging interface and the battery. The first circuit is configured to receive a first current from the charging interface and convert the first current to a second current with magnitude and/or direction changed. The charging interface is a universal serial bus interface and the first current is a direct current. The magnetic coupling element includes a first coil and a second coil, the first coil is connected with the first circuit, the second coil is connected with the second circuit, and the first coil and the second coil are separated from each other to disconnect a direct current path of the charging circuit when the first circuit fails.

Abstract: The present invention discloses a power supply circuit and a UPS auxiliary power supply system having the same. The power supply circuit comprises a transformer, a primary-side switch unit and a secondary-side switch unit. When the input power supply is powered on, the second switch of the secondary-side switch unit maintains in an off state, the first switch of the primary-side switch unit performs an on-off action, and the input power supply supplies power to the load and the energy storage unit. When the input power supply is powered down, the first switch of the primary-side switch unit maintains in an off state, the second switch of the secondary-side switch unit performs an on-off action, and the energy storage unit supplies power to the load.

Abstract: A power supply device comprises: a first switching circuit that includes a series circuit, connected between a predetermined voltage level and a ground level, having a high side switching element and a low side switching element connected in series that are alternately turned on and off at a predetermined frequency; a second switching circuit that includes a switching element controlled between on and off, the switching element having one end being connected to the ground level, and that makes an ON time point of the switching element variable; and a control unit that performs control such that ON time points of the switching element and the high side switching element are not overlapped with each other.

Abstract: A power converter including: a dual output resonant converter including a first output, a second output, a common mode control input, and a differential mode control input, wherein a voltage/current at the first output and a voltage/current at the second output are controlled in response to a common mode control signal received at the common mode control input and a differential mode control signal received at the differential mode control input; and a dual output controller including a first error signal input, a second error signal input, a delta power signal input, a common mode control output, and a differential mode control output, wherein the dual output controller is configured to generate the common mode control signal and the differential mode control signal in response to a first error signal received at the first error signal input and a second error signal received at the second error signal input, wherein the first error signal is a function of the voltage/current at the first output and the seco

Abstract: A power supply system comprises: a switched-capacitor converter, a multi-tapped autotransformer, and an output stage. The multi-tapped autotransformer includes multiple primary windings. The switched-capacitor converter includes multiple circuit paths coupled to the primary windings. For example, a first circuit path includes a first capacitor; a second circuit path includes a second capacitor. The power supply further includes a controller that controllably switches an input voltage to the first circuit path and the second circuit path, conveying energy to the primary windings of the multi-tapped autotransformer. The output stage of the power supply is coupled to receive energy from a combination of the first primary winding and the second primary winding of the multi-tapped autotransformer. Via the received energy, the output stage produces an output voltage that powers a load.

Abstract: The present invention discloses a method and an apparatus for controlling a flyback converter, the flyback converter including a main switch, a transformer and an auxiliary switch. The method includes: obtaining a first voltage signal and a second voltage signal, the first voltage signal representing an input voltage of the flyback converter, and the second voltage signal representing an output voltage of the flyback converter; controlling turn-on of the auxiliary switch, wherein the turn-on time period of the auxiliary switch is determined according to the first voltage signal and the second voltage signal; and turning on the main switch at ZVS condition, wherein the main switch is turned on at the time delayed for a duration of a dead time after turning off of the auxiliary switch.

Abstract: A reactor according to an embodiment of the present disclosure includes a reactor main body including cores and coils wound on the cores; and a base having a polygonal shape extending outside the reactor main body, configured to support the reactor main body. In at least two sides that are not opposite each other, of a plurality of sides of the base, a plurality of notches are formed inwardly from each of the sides, so that axes of fasteners to temporarily secure the base to an installation target object pass through the notches.

Abstract: A method for controlling a PSFB converter, an apparatus, and a storage medium are disclosed, and relate to the field of power supply technologies. The method includes: controlling, by a control circuit after controlling a first clock and a second clock to operate in a first state for a time period, the first clock and the second clock to switch to a second state, where when the first clock and the second clock operate in the first state, the first bridge arm is a leading bridge arm, and the second bridge arm is a lagging bridge arm, and when the first clock and the second clock operate in the second state, the first bridge arm is a lagging bridge arm, and the second bridge arm is a leading bridge arm.

Abstract: A driving circuit and driving method for driving a synchronous rectifier. When a drain-source detecting voltage between a drain terminal and a source terminal of the synchronous rectifier reaches a second reference voltage, the driving voltage applied at a gate terminal of the synchronous rectifier is decreased to regulate the drain-source detecting voltage to a first reference voltage. The first reference voltage is lower than the second reference voltage. And when the drain-source detecting voltage reaches an off reference voltage, the synchronous rectifier is turned off.

Abstract: An apparatus includes power blocks. Each power block includes converter modules. Each converter module includes a positive and a negative bidirectional converter and a battery module. The bidirectional converters are connected to the battery module and outputs are connected in parallel. Paralleled positive bidirectional converters are connected in series between a positive connection and a neutral connection and the paralleled negative bidirectional converters of each power block are connected in series between the neutral connection and a negative connection. A DC-link controller controls a positive output voltage between the positive and neutral connections to follow a positive voltage reference and controls a negative output voltage between the neutral and negative connections to follow a negative voltage reference.

Abstract: A high speed sensor system including coupler, a sensor, a memory module, and a processor module is provided. The sensor includes a transmitter coil adapted to be energized by a high frequency current source and at least two receiving coils. One of the receiver coils generates a sine-like function output signal and the other generates a cosine-like function output signal upon rotation of the coupler. The memory module is operable to compensate for non-sinusoidal output signals caused by the high speed sensor system and the gap between the coupler and the at least two receiving coils. The processor module is communicatively coupled to the memory module. The processor module is configured to process the non-sinusoidal output signals from both the first and second receiver coils, determine the offset error, and generate a corrected output signal representative of the rotational position of the coupler.

Abstract: Disclosed examples include isolated dual active bridge (DAB) DC to DC converters with first and second bridge circuits, a transformer with a sense coil, and a secondary side control circuit to provide secondary side switching control signals to regulate an output voltage or current signal by controlling a phase shift angle between switching transitions of the secondary side switching control signals and switching transitions of a secondary side clock signal, where the secondary side control circuit includes a clock recovery circuit to synchronize the secondary side clock signal to transitions in a sense coil voltage signal of the sense coil.

Abstract: A power supply includes a transformer winding, a switching circuit, a controller and a filter circuit. The transformer winding is configured to provide a first voltage. The switching circuit is coupled to the transformer winding and includes a first and a second switching unit. On the condition that the power supply is operated under a standby mode, the controller controls the first and the second switching units to provide a discharging path between two terminals of the transformer winding. On the condition that the power supply is operated under an operating mode, the controller controls the switching circuit such that the switching circuit provides a second voltage according to the first voltage. The filter circuit is coupled to the switching circuit and configured to filter the second voltage to provide an output voltage.

Abstract: A series-type photovoltaic high-voltage direct current (DC) grid-connected converter topological circuit and a modulation method thereof, wherein the topological circuit includes a high-frequency transformer configured to isolate a primary side circuit from a secondary side circuit. The primary side circuit includes a high-frequency full-bridge inverter circuit, an active-clamping circuit, an input capacitor C1, an input diode D0, and a boost inductor L1 and adjusts the boost mode and buck mode of the topological circuit. The secondary side circuit includes a high-frequency rectifying circuit, a filter capacitor C3 and a filter capacitor C4, and rectifies and filters an output voltage of the high-frequency transformer. The secondary side circuit further includes a switch tube Q5, and the switch tube Q5 adjusts the secondary side circuit into a voltage multiplication circuit to double the output voltage of the high-frequency transformer.

Abstract: An LLC converter includes a resonant circuit connected to a DC input voltage, a switching circuit connected to the DC input voltage, transformers each including primary windings and secondary windings, and synchronous rectifiers each connected to one secondary winding and to ground. The primary windings of the transformers include a first primary winding and a second primary winding. The first primary windings of the transformers are connected in series, and the second primary windings of each of the plurality of transformers are connected in series. The series-connected first primary windings and the series-connected second primary windings are directly connected in parallel with the resonant circuit. A first current from a first switch flows into the series-connected first primary windings, and a second current from a second switch flows into the series-connected second primary windings. Currents from each of the secondary windings are equal or substantially equal.

Abstract: An AC/DC PFC converter comprises an LLC PFC pre-regulator and a DC/DC converter output stage. The output stage has a feedback unit adapted to provide a feedback signal (in addition to the conventional feedback of the bus voltage error) to the control circuit of the PFC pre-regulator for modulating the controlled output voltage of the PFC pre-regulator in dependence on the output power and/or the input current and voltage. In this way, the total harmonic distortion of the input of the converter can be reduced by controlling the gate switching in the PFC pre-regulator.

Abstract: Controllers, systems and methods are presented related to resonant converters. In case of a load imbalance between the resonant converters, an on-time of a synchronous rectifier switch of one of the resonant converters is reduced.

Abstract: A DC/DC converter comprises a transformer having a primary and a secondary, a winding of the primary forming part of a transformer power supply self-oscillating circuit. The primary side includes a controllable circuit that receives a first digital signal to be transmitted to the secondary, and a modulation device acting on the self-oscillating circuit. The secondary side comprises a detection and de-modulation circuit for recovering the first signal. The modulation device delivers a second signal that controls, via a switch, application of a first DC voltage across the self-oscillating circuit when the second signal is in a first state, the second signal comprising first pulse trains in a second state during first periods of the first signal. The detection and demodulation circuit comprises a device for reconstructing the first pulse trains of the second signal based on interruptions of energy recovered at the secondary, thereby deducing the first signal therefrom.

Abstract: One example includes an interleaved resonant converter circuit. The circuit includes a plurality of resonant converter circuits that are each coupled to an output node and are configured to collectively generate an output voltage on the output node in response to a respective plurality of sets of switching signals at each of a respective plurality of phases. The circuit also includes a switching controller configured to generate each of the plurality of sets of switching signals having a variable duty-cycle relative to each other at each of the plurality of phases.

Abstract: A power conversion apparatus includes: a busbar; a magnetic core disposed to surround the busbar; and a fixing member that supports the magnetic core and is secured to the busbar. A noise filter includes: a magnetic core disposed to surround a busbar of a power conversion apparatus, and a fixing member that supports the magnetic core and is secured to the busbar.

Abstract: Controlling operation of a converter circuit regulating power transfer between first and second voltage sources includes comparing a detected power value in the converter circuit with a power command value; determining a converter gain based on detected first and second voltage levels of the first and second voltage sources; and determining operation signals for transmitting to switches in the converter circuit during a steady state to control switching time and duration. When the detected power value differs from the power command value, the method includes determining values of two or more variables associated with adjustment of switching time and duration based on the detected first and second voltage levels; and determining operation signals to transmit to the switches during a power transition state based on the determined values of the two or more variables to adjust switching time and switching duration of the switches, thereby regulating power transition.

Abstract: At least one aspect of the disclosure is directed to an AC switching system. The AC switching system includes a first I/O, a second I/O, a first segment including a first plurality of switches, the first segment being coupled to the first I/O, a second segment including a second plurality of switches, the second segment being coupled with the first segment and coupled to the second I/O, a third segment including a diode, the third segment being coupled to the first I/O and coupled to a junction of the first segment and the second segment, and a fourth segment including a diode, the fourth segment being coupled to the second I/O and coupled to the junction of the first segment and the second segment.

Abstract: A flyback switching power supply, comprising a main power switch, a transformer and a rectifier is described. The transformer comprises a primary winding and a secondary winding, the main power switch is connected with the primary winding, the rectifier is connected with the secondary winding. When the output voltage of the flyback switching power supply is lower than a first threshold value, the rectifier is controlled to be turned on for a transient period; by detecting the negative current flowing through the main power switch, performing integral operation on the voltage across the auxiliary winding, and sampling the peak voltage of the drain-to-source voltage of the main power switch for several times, whether the rectifier is turned on can be determined if the output voltage at the secondary side is lower than the threshold voltage, and the main power switch is controlled to be turned on accordingly.

Abstract: An X-ray generation device that emits X-rays due to an electron beam emitted from a cathode arriving at a target, includes: first and second high voltage power supplies that are connected in series between the cathode and the target, and both of which accelerate the electron beam; and wherein the second high voltage power supply outputs a second high voltage so that, with respect to a phase of a ripple component of a first high voltage generated by the first high voltage power supply, a phase of a ripple component of the second high voltage generated by the second high voltage power supply has a predetermined relationship.

Abstract: A wireless power transfer system with a class DE inverter for power transfer to a load. The wireless power transfer system includes a half-bridge circuit, a zero voltage switching (ZVS) tank, a shunt capacitor array, an evaluation circuit, and a controller. The half-bridge circuit has two transistors connected in series with each of the two transistors driven by a gate driving signal with a duty cycle. The ZVS tank and the shunt capacitor array are electrically connected with the half-bridge circuit. The ZVS tank includes two capacitors and an inductor. The shunt capacitor array has a capacitance that is tunable. The evaluation circuit calculates a power conversion efficiency of the system. The controller receives the power conversion efficiency from the evaluation circuit and generates control signals to adjust the duty cycle of the gate driving signal and to adjust the capacitance of the shunt capacitor array in order to maximize the power conversion efficiency of the system.

Abstract: The power supply apparatus includes a current detection unit configured to detect a current that flows through a first switching element of a transformer, and a control unit controls a turn-on time of the first switching element based on a feedback voltage from a secondary side of the transformer, controls a turn-on time of a second switching element based on a detection result of the current detection unit, and performs switching between a continuous control and an intermittent control based on the feedback voltage, the continuous control being a control to perform an operation of continuing a first period, the intermittent control being a control to perform an operation of alternately repeating the first period and a second period.

Abstract: A resonant inverter includes: an input capacitor; an inverter; a snubber circuit; a transformer having a primary winding connected to an AC end of the inverter; a resonant coil, a resonant capacitor, and a current sensor on the secondary winding side of the transformer; and a control unit, wherein, on the basis of current detected by the current sensor, the control unit controls switching elements so as to perform zero voltage switching at the time of turning-on, at a frequency at which a load including the resonant coil and the resonant capacitor becomes capacitive, and performs power regeneration of energy stored in a snubber capacitor to a DC voltage source.

Abstract: A power supply device used in an induction type power supply system is provided that includes a power supply coil, an auxiliary coil, a power supply driving module, a auxiliary driving module, a harmonic frequency measuring module, a voltage measuring module and a processing module. The power supply driving module drives the power supply coil. The auxiliary driving module drives the auxiliary coil. The harmonic frequency measuring module measures a resonance frequency of the power-supply coil according to a capacitive and inductive parameter related to the power-supply coil. The voltage measuring module tracks and locks a maximum of an oscillation voltage of the auxiliary coil. When the processing module determines that the resonance frequency is stable and the oscillation voltage decreases more than a predetermined ratio of the oscillation voltage, the processing module keeps the power supply driving module under a non-working status.