Abstract: A voltage conversion device includes a first conversion circuit configured to switch a DC voltage at a DC power supply to convert the DC voltage into an AC voltage, a second conversion circuit configured to rectify the AC voltage converted with the first conversion circuit to convert the AC voltage into a DC voltage, a controller configured to control switching operation of the first conversion circuit, and emergency power supply circuits (a clamp circuit and a constant-voltage circuit) provided between a connection point of an auxiliary switching element and a capacitor and the controller. When an input voltage at the DC power supply decreases due to start-up of a starter motor in releasing idling stop of a vehicle, the emergency power supply circuits obtain a power supply voltage necessary for operation of the controller from a voltage at the connection point, and supply the power supply voltage to the controller.

Abstract: An automatic tuning assist circuit is coupled in series with a transmission antenna. A first switch and a second switch are arranged in series between a first terminal and a second terminal of the automatic tuning assist circuit. Furthermore, a third switch and a fourth switch are arranged in series between the first terminal and the second terminal. A first auxiliary capacitor is arranged between a connection node that connects the first switch and the second switch and a connection node that connects the third switch and the fourth switch. A control unit switches the first switch through the fourth switch with the same frequency as that of the driving voltage, and with a predetermined phase difference with respect to the driving voltage.

Abstract: A synchronization rectification device is connected with a secondary side of a transformer of a power supply and an output capacitor. The synchronization rectification device includes a rectification switch, a voltage-controlled switch module and a rectification controller. The rectification switch is connected between the secondary side and the output capacitor. The voltage-controlled switch module connected with the secondary side has a voltage-division capacitor and receives a secondary voltage generated by the secondary side. The rectification controller is connected with the rectification switch and the voltage-controlled switch module. When the secondary voltage rises to a switching voltage value below a first voltage value, the rectification controller controls the rectification switch to be turned off. After the rectification switch is turned off, the voltage-controlled switch module is turned off, and the voltage-division capacitor receives the secondary voltage.

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: A power conversion device includes: a positive arm and a negative arm each of which is formed by connecting a plurality of converter cells in series, the converter cells each being composed of a plurality of semiconductor switching elements and a DC capacitor; and a control circuit. An arm balance control unit in the control circuit calculates a first voltage adjustment value for balancing voltage of the DC capacitors in the positive arm and voltage of the DC capacitors in the negative arm. The control circuit adjusts an AC control command using the first voltage adjustment value, thereby calculating an AC voltage command for AC voltage to be outputted to an AC line for each phase.

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: An electric generator driven by a source of variable energy produces at its output an alternating current (AC) output voltage and current which is converted via controllable active switching circuitry into a direct current (DC) voltage which is stored in an energy storage element. Power losses are associated with the active switching circuit and the AC to DC conversion. The power available at the output of the generator can be determined. If the available power is less than the power losses the controllable switching circuitry is disabled.

Abstract: A class of switching power supplies that use a resonant isolation stage (typically LLC) fed directly or via a diode bridge from the line. Extension of the range of available gain values over frequency without material loss of efficiency is facilitated by usage of additional resonant elements. This capability allows the devices to provide narrow-range inputs to secondary-processing circuits, with the ability to achieve power factor correction if required. The conversion architecture is also compatible with optimal usage of energy storage elements suitable for use with switching power supplies.

Abstract: A radio frequency system has a first and a second antenna terminal, a radio frequency transceiver coupled to the antenna terminals, a rectifier connected to the antenna terminals at its input side and a voltage limiter. The voltage limiter comprises a first and a second input terminal connected to the antenna terminals, and a first and a second diode element connected between the first respectively the second input terminal and a bias terminal. A regulation transistor is connected between the bias terminal and the reference potential terminal. A voltage controller has a reference input for receiving a reference signal, a feedback input connected to the bias terminal and a control output for providing a control potential to a control terminal of the regulation transistor on the basis of the reference signal and a signal at the bias terminal.

Abstract: A rectifier includes: first and second high side switches including source terminals connected to an alternating current input terminal and drain terminals connected to one end of an output capacitor; first and second low side switches including drain terminals connected to the alternating current input terminal and source terminals connected to a ground terminal and another end of the output capacitor; and a cross connector configured to allow parasitic capacitance of the first high side switch or the second high side switch to flow to a ground when the first high side switch or the second high side switch is turned off.

Abstract: Methods and systems for transforming electric power between two or more portals. Any or all portals can be DC, single phase AC, or multi-phase AC. Conversion is accomplished by a plurality of bi-directional conducting and blocking semiconductor switches which alternately connect an inductor and parallel capacitor between said portals, such that energy is transferred into the inductor from one or more input portals and/or phases, then the energy is transferred out of the inductor to one or more output portals and/or phases, with said parallel capacitor facilitating “soft” turn-off, and with any excess inductor energy being returned back to the input. Soft turn-on and reverse recovery is also facilitated. Said bi-directional switches allow for two power transfers per inductor/capacitor cycle, thereby maximizing inductor/capacitor utilization as well as providing for optimum converter operation with high input/output voltage ratios. Control means coordinate the switches to accomplish the desired power transfers.

Abstract: A rectifier circuit can include a plurality of FETs arranged as a rectifier; and a start-up circuit applied to each of the plurality of FETs that turn each of the FETs off during a circuit startup period, wherein the start-up circuit provides a large impedance for low power dissipation during normal operation of the rectifier.

Abstract: Switched mode power supply (SMPS) with adaptive reference voltage for controlling an output transistor and method of operating the SMPS are described. The adaptive reference voltage is implemented using a timer that starts when the voltage on a conduction terminal of the output transistor reaches a reference voltage and stops when the current through the output transistor reaches zero. The voltage difference between a target voltage and a voltage accumulated when the timer was active is then sampled to produce a sampled voltage, which defines a new reference voltage if the accumulated voltage is not equal to the target voltage so that the reference voltage is adaptively adjusted in accordance with an operational characteristic of the output transistor.

Abstract: A method for operating an active rectifier including a multitude of controllable semiconductor switching elements, in which a switch is carried out between a first control mode and a second control mode for controlling the semiconductor switching elements, and vice versa, the semiconductor switching elements being controlled with a first switching time in the first control mode and with a second switching time in the second control mode, the second switching time being greater than the first switching time.

Abstract: The present invention relates to a power supply device for voltage converter, which includes a master switch, a first controller for generating a first pulse signal to drive the master switch to be turned on and turned off, a second controller for comparing a detection voltage representing an output voltage and/or load current with a first reference voltage to determine the logic state of a control signal generated by the second controller, and a coupling element connected between the first controller and the second controller for transmitting the logic state of the control signal to the first controller and enabling the first controller to determine the logic state of the first pulse signal according to the logic state of the control signal. The second controller includes a driving module for generating a second control signal to drive a synchronous switch to be turned on and turned off.

Abstract: Disclosed herein is an active rectifier. The rectifier includes a rectifier unit, a driver unit, and a switching device control circuit unit. The rectifier unit includes first and fourth transistors configured to become conductive when the voltage of an alternating current (AC) input is negative and apply the current of the AC input to a rectifier capacitor, and second and third transistors configured to become conductive when the voltage of the AC input is positive and apply the current of the AC input to the rectifier capacitor. The driver unit outputs first to fourth drive control signals, and drives the first to fourth transistors. The switching device control circuit unit compares the first drive control signal and the second drive control signal with the AC input, and outputs switching device control signals to delay the first to fourth drive control signals based on the extents to delay.

Abstract: A method comprises providing a resonant converter comprising a switching network comprising a first high-side switch, a second high-side switch, a first low-side switch and a second low-side switch, a resonant tank coupled between the switching network and a transformer and a rectifier coupled to a secondary side of the transformer, coupling a driver to the switching network and the rectifier, wherein the driver includes a first winding coupled to the rectifier, a second winding coupled to the first high-side switch and a third winding coupled to the second high-side switch, detecting a signal indicating a soft switching process of the driver and adjusting a resonant frequency of the driver until the resonant frequency of the driver approximately matches a switch frequency of the resonant converter.

Abstract: A power supply device includes: a rectifier having an input terminal connected to one end of a switching element configured to perform synchronous rectification; a coil having one end connected to an output terminal of the power supply device; and a second capacitor connected in series to a first capacitor, the first capacitor having one end grounded, the second capacitor having one end connected to a connection point between another end of the first capacitor and the one end of the coil, and the second capacitor having another end connected to an output terminal of the rectifier.

Abstract: Disclosed is an isolated power conversion system for providing a function of isolated power conversion by converting an AC power into a DC output power, and a rectifying unit, a transformer, a switching transistor, a first pulse width modulation (PWM) controller, a second PWM controller, an output unit and a signal blocking unit are included. The signal blocking unit is employed as a connection interface between the first and second PWM controllers to provide digital signal for communication. Noise margin and stability of electrical operation are improved to avoid malfunction. Overall, the present invention greatly enhances stability of power conversion and secures quality of electrical signal.

Abstract: A power converter for converting DC power to DC power includes an inverter stage having two or more switched inverters configured to receive DC power from a source and produce a switched AC output power signal. A transformation stage is coupled to receive the switched output power signal from the inverter stage, shape the output power signal, and produce a shaped power signal. A rectifier stage having two or more switched inverters coupled to receive the shaped power signal and convert the shaped power signal to a DC output power signal is included. A controller circuit is coupled to operate the power converter in a variable frequency multiplier mode where at least one of the switched inverters is switched at a frequency or duty cycle that results in an output signal having a frequency that is a harmonic of the fundamental frequency being generated by the power converter.

Abstract: An inductive wireless power enabled device may comprise a transceiver including a plurality of switches coupled with a resonant tank, and control logic configured to drive the plurality of switches to operate the resonant tank in one of a transmit mode and a receive mode. Another inductive wireless power enabled device may comprises a transceiver including a plurality of switches coupled with a resonant tank. The transceiver may be configured to both transmit a wireless power signal through the resonant tank and generate power from an incoming wireless power signal through the resonant tank depending on a current operational mode. A related method for operating a wireless power enabled device according to either a transmit mode or a receive mode is also disclosed.

Abstract: An energy harvesting device harvests energy from an energy source, and includes an inductor and a control switch coupled in series, and a control module. The series connection of the inductor and the control switch is adapted to be coupled to the energy source in parallel or in series. The control module controls the control switch such that the control switch starts to operate in an ON state for a predetermined time period from a transition time point during each predetermined cycle starting from a start time point, and such that a time difference between the transition time point and the start time point is variable. The control module obtains an output power of the energy source, and adjusts the time difference such that the output power of the energy source is increased.

Abstract: A non-contact charger aims to control transmitted power efficiently. The non-contact charger includes a transmitting coil, an inverter circuit, a receiving coil, and a transmitted power control circuit. The inverter circuit outputs the transmitted power to the transmitting coil. The receiving coil receives power as received power from the transmitting coil. The transmitted power control circuit drives the inverter circuit at a frequency higher than maximum received power frequencies at which the received power has one or two maximum values.

Abstract: A switching converter includes a synchronous rectifier and a synchronous rectifier driver that controls conduction of the synchronous rectifier. The synchronous rectifier driver turns OFF the synchronous rectifier in response to a turn-off trigger. The synchronous rectifier driver prevents the turn-off trigger from turning OFF the synchronous rectifier during a turn-off trigger blanking time that is adaptively set based on a conduction time of the synchronous rectifier.

Abstract: A short-circuit device and a protection method for a submodule for a power converter are disclosed. The submodule includes a bridge circuit having at least one power semiconductor branch extending between a first and a second DC voltage node and at least one controllable power semiconductor switch disposed therein to which a freewheeling diode is connected in anti-parallel, and a capacitor connected in parallel to the bridge circuit. The short-circuit device has at least one selected of the freewheeling diodes anti-parallel to the power semiconductor switches of the bridge circuit, wherein the at least one selected freewheeling diode is manufactured in press pack design and rated such that, when a fault occurs in the submodule, the at least one selected freewheeling diode breaks down due to the fault conditions and provides a durable, stable, low-impedance short circuit path between a first and a second AC voltage connection of the submodule.

Abstract: A power converter arrangement is described. The power converter includes a dc link and a power converter. The dc link is operably connected between a generator, or other power source, that provides an output voltage in use and a dc network. The power converter includes an inverter connected across the dc link in parallel with the generator, an isolation transformer having a primary tap changer and a secondary tap changer, and a rectifier. The rectifier has ac terminals connected to the secondary tap changer, a first dc terminal connected to the dc link, and a second dc terminal connected to the dc network. The dc terminal voltage of the rectifier is therefore summated with the output voltage of the generator to provide a converter output voltage.

Abstract: A switching converter has a self-driven bipolar junction transistor (BJT) synchronous rectifier. The BJT rectifier includes a BJT and a parallel-connected diode, and has a low forward voltage drop. In a first portion of a switching cycle, a main switch is on and the BJT rectifier is off. Current flows from an input, through the main switch, through the first inductor, to an output. Current also flows through the main switch, through the second inductor, to the output. In a second portion of the cycle, the main switch is turned off but the inductor currents continue to flow. Current flows from a ground node, through the BJT rectifier, through the first inductor, to the output. The BJT is on due to the second inductor drawing a base current from the BJT. In one example, the main switch is a split-source NFET that conducts separate currents through the two inductors.

Abstract: A switch mode power converter includes a primary side, an energy transfer element, and a secondary side. The secondary side includes output terminals coupled to a load and an output capacitance across the output terminals. The secondary side further includes a compensation signal generator—configured to generate a compensation signal. The compensation signal compensates charging the output capacitance with power transferred from the primary side to the secondary side. The secondary side further includes computational circuitry configured to output an adjusted compensation signal that compensates, based on the compensation signal, one of an output sense signal representative of an output signal at the output terminals and a reference signal representative of a desired output voltage of the switch mode power converter. The secondary side further includes a comparator to compare the adjusted compensation signal with the other one of the output sense signal and the reference signal.

Abstract: A circuit for providing dynamic output current sharing using average current mode control for active-reset and self-driven synchronous rectification with pre-bias startup and redundancy capabilities for power converters. The circuit communicates a secondary side feedback signal to a primary side via a bidirectional magnetic communicator that also provides a secondary voltage supply. Pre-bias startup is achieved by detection of the output current direction and controlling the gate signals of synchronous rectifiers. The circuit permits dynamic current sharing via a single-control signal and automatic master converter selection and promotion.

Abstract: A bidirectional DC/DC converter includes first and second control circuits, and first and second bridge circuits respectively connected to first and second direct current voltage supplies. In one embodiment variant, when power is supplied from the first direct current voltage supply to the second direct current voltage supply, the first control circuit carries out PFM control of the first bridge circuit at a frequency equal to or lower than the resonance frequency of an LC resonant circuit in accordance with a control amount based on the voltage and current of the second direct current voltage supply. When power is supplied in the other direction, the second control circuit carries out fixed frequency control of the second bridge circuit, using phase shift control or the like, in accordance with a control amount based on the voltage and current of the first direct current voltage supply.

Abstract: An active rectifier and a wireless power reception apparatus using the same are disclosed herein. The active rectifier includes first and fourth switches, second and third switches, and a synchronization control unit. The first and fourth switches are turned on while the voltage of an alternating current (AC) input is negative, and apply the current of the AC input to a rectifying capacitor. The second and third switches are turned on while a voltage of the AC input is positive, and apply the current of the AC input to the rectifying capacitor. The synchronization control unit compensates for the delay time of the comparator for detecting zero-crossing of the AC input so as to switch the first to fourth switches.

Abstract: The disclosed embodiments provide a system that operates a flyback converter. During activation of a synchronous rectifier (SR) controller on a secondary side of the power converter, the system temporarily disables driving of a gate of a metal-oxide-semiconductor field-effect transistor (MOSFET) by the SR controller to enable synchronization of the SR controller to a switching frequency on a primary side of the power converter. After driving of the gate of the MOSFET by the SR controller has been disabled for a pre-specified period, the system enables driving of the gate of the MOSFET by the SR controller.

Abstract: A synchronous rectifier comprises at least one rectification switch (102, 103), and a control circuit (104) for controlling the at least one rectification switch to allow unidirectional current flow only. The control circuit comprises at least one current sensor (105, 106) for sensing an alternating component of current of the at least one rectification switch, and at least one driver circuit (107, 108) for controlling the at least one rectification switch at least partly on the basis of the direction of the sensed alternating component. Using the alternating component for controlling the rectification switch removes a need to compare the current to any non-zero constant or adjustable threshold value, and thus challenges related to defining the threshold value can be avoided. The synchronous rectifier can be for example a part of a resonant converter.

Abstract: A power converter 1 includes a first conversion circuit 10 connected with a first winding n1 of a transformer 40, and a second conversion circuit 20 connected with a second winding n2 of the transformer 40. The first and second conversion circuits 10 and 20 are configured to perform bidirectional power conversion. The power converter further includes a third conversion circuit 30 that is a circuit provided at a pre-stage of the first conversion circuit 10 in a direction of transferring electric power toward the second conversion circuit 20 from the first conversion circuit 10. The third conversion circuit 30 is configured to perform bidirectional power conversion, and function as a boosting chopper circuit upon transferring electric power toward the second conversion circuit 20 from the first conversion circuit 10.

Abstract: An electric power converter for converting AC to DC power or DC to AC power is disclosed. The converter includes a circuit for controlling the voltage and the circuit for controlling the current separately. The voltage is controlled by the switching modules and the up-side controller using the calculated target voltage. The current is controlled by the current controller using the calculated target current.

Abstract: A bidirectional DC-DC converter is disclosed. According to the bidirectional DC-DC converter, switching loss is reduced by implementing zero voltage switching of switching devices in a boost mode of the bidirectional DC-DC converter. Accordingly, it is possible to realize the high efficiency of power conversion. Further, switching devices of the bidirectional DC-DC converter are controlled using simple logic devices, thereby controlling a plurality of directional DC-DC converters coupled in parallel to each other.

Abstract: A synchronous rectification controller is arranged on the secondary side of an insulated synchronous rectification DC/DC converter. The synchronous rectification controller controls a synchronous rectification transistor M. An automatic shutdown circuit judges, based on the voltage VDS across the synchronous rectification transistor, whether the operation mode of a primary-side controller is a burst mode or a non-burst mode. When judgment has been made that the operation mode is the burst mode, the automatic shutdown circuit instructs a driver to suspend the switching of the synchronous rectification transistor M.

Abstract: Disclosed is a rectifying circuit for high-frequency power supply that rectifies an alternating voltage at a high frequency equal to or higher than 2 MHz, the rectifying circuit for high-frequency power supply including a current doubler rectifier circuit that rectifies the alternating voltage inputted from a reception antenna for power transmission 10, a partial resonant circuit that causes the current doubler rectifier circuit to perform partial resonant switching in a switching operation at the time of rectification, a matching functional circuit that has a function of matching a resonance condition to that of the reception antenna for power transmission 10, and a function of matching the resonance condition to that of the partial resonant circuit, and a smoothing functional circuit that smooths the voltage rectified by the current doubler rectifier circuit into a direct voltage.

Abstract: A power supply device includes: a switching element that performs synchronous rectification on a power to be induced in a first secondary wiring of a transformer that performs voltage conversion; a first current detection circuit that detects a value of a current to be induced in a second secondary wiring of the transformer; a second current detection circuit that detects a change in the current to be induced in the second secondary wiring, the second current detection circuit having a higher response speed with respect to conversion of the current than that of the first current detection circuit; and a control unit (control circuit) that determines based on the change in the current detected by the second current detection circuit whether or not backflow is occurring, and controls the switching element in accordance with a result of the determination.

Abstract: An energy efficient apparatus includes a switching device, a frequency dependent reactive device, and a control element is provided. The switching device is coupled to a source of electrical power and includes a pair of transistors and is adapted to receive a control signal and to produce an alternating current power signal. The frequency of the alternating current power signal is responsive to the control signal. The frequency dependent reactive device is electrically coupled to the pair of transistors for receiving the alternating current power signal and producing an output power signal. The frequency dependent reactive device is chosen to achieve a desired voltage of the output power signal relative to the frequency of the alternating current power signal. The control element senses an actual voltage of the direct current power signal and modifies the control signal delivered to achieve the desired voltage of the direct current power signal.

Abstract: A semi-active bridge for furnishing voltage of a correct polarity to a powered device in a Power over Ethernet (PoE) network is disclosed. In one or more implementations, the semi-active bridge includes a diode having an anode portion and a cathode portion. The anode portion of the diode is connected to an input terminal, and the cathode portion of the diode is connected to an output terminal. The semi-active bridge also includes an active transistor device having a source region and a drain region. The drain region of the active transistor device is connected to the input terminal, and the source region of the active transistor device is connected to the output terminal.

Abstract: A boost regulator that selectively operates in an asynchronous mode, a synchronous mode, or an adaptive mode. In the adaptive mode, the boost mode regulator controls a high side switch according to an adaptive dead time. Adaptive mode allows the boost regulator to operate more efficiently than in asynchronous mode.

Abstract: A hand tool battery includes a charging coil and a bridge rectifier. The bridge rectifier has at least two rectifying arrangements for synchronous rectification.

Abstract: A power converter with an isolated topology may include a primary side and a secondary side. The secondary side includes a self-powered synchronous rectifier. The synchronous rectifier includes a synchronous rectifier transistor having at least a drain and a gate, a voltage regulator having at least an input that is coupled to the drain of the synchronous rectifier transistor, and an auxiliary transistor having at least a drain that is coupled to the drain of the synchronous rectifier transistor. The auxiliary transistor is on a same die as the synchronous rectifier transistor. The synchronous rectifier also includes a clamping device having at least an output that is coupled to the gate of the auxiliary transistor, and a gate driver circuit having at least: a power supply input that is coupled to the output of the voltage regulator, and an output that is coupled to a gate of the synchronous rectifier transistor.

Abstract: It is possible to achieve zero-voltage switching in continuous conductance mode (CCM) flyback converters by reducing the voltage differential across the primary winding immediately prior to transitioning the primary circuit from the off-state to the on-state. In one example, the voltage differential is reduced to the extent that polarity across the primary winding is reversed. In another example, the voltage differential across the primary winding is reduced significantly, but not to the extent that the polarity is reversed. Reducing the voltage differential across the primary winding may reduce a voltage potential across a current path of a switching transistor (e.g., a source-drain in a FET transistor) used to transition the primary circuit from the off-state to the on-state, which may decrease the parasitic power loss when the switching transistor is activated (closed).

Abstract: The present invention provides a light emitting diode (LED) driving device as a semiconductor device, which comprises: a direct current/direct current (DC/DC) controller, for controlling an output segment that is used to generate an output voltage from an input voltage and supply the output voltage to an LED; an output current driver, for generating an output current of the LED; and an LED short-circuit detection circuit, for monitoring a cathode voltage of the LED to perform an LED short-circuit detection, wherein the LED short-circuit detection circuit controls whether an action is performed or not according to a short-circuit detection enable signal input from outside the LED driving device.

Abstract: A circuit can include a switching element, a charge storage element, a first rectifying element, and a second rectifying element. A current-carrying electrode of the switching element and a terminal of the charge storage element are coupled to each other. The other terminal of the charge storage element, an anode of the first rectifying element, and a cathode of the second rectifying element are coupled to a floating node. A cathode of the first rectifying element is coupled to an input terminal, and an anode of the second rectifying element is coupled to a reference node. In a particular embodiment, the circuit can be part of a power converter. The charge storage element can help to capture charge during a switching operation and release the captured charge during a subsequent switching operation. The charge storage element can help the circuit to operate more efficiently.

Abstract: One or more first switches coupled to one of a primary transformer winding and a secondary transformer winding are controlled based on a first switch control reference clock signal. A reflected voltage across the other of the primary and secondary windings is sensed, and a second switch control reference clock signal is synchronized to the first switch control reference clock signal based on the reflected voltage. One or more second switches coupled to the other of the primary and secondary windings are controlled based on the second switch control reference clock signal. A digital isolator could instead be used to transfer a switch control reference signal across an isolation boundary. Switch control signals for controlling a set of switches on one side of the isolation boundary may be derived from a switch control reference signal that is synchronized with the transferred switch control reference clock signal.

Abstract: A dual active bridge (DAB) converter operates in a power conversion operation by controlling multiple bridge configured switches to charge a magnetization inductance from an input supply during a charge phase of a power cycle and to discharge the magnetization inductance into an output of the DAB during a discharge phase of the power cycle. The DAB converter includes an input converter connected to the input supply, an inductance connected to the input converter, a transformer comprising a primary and a secondary winding, and an output converter connected to the transformer. The input and output converters each include a first pair of switches forming a first circuit path, and a second pair of switches forming a second circuit path parallel to the first circuit path. The first and second circuit paths are both completed by a third circuit path including the inductance and the primary winding of the transformer.

Abstract: A shunt regulator for use in a power converter having an energy transfer element for regulating a transfer energy of the output signal delivered to the load. An auxiliary winding of the energy transfer element being utilized to produce an internal bypass voltage, VBP, at a bypass pin coupled to an external capacitive load, the shunt regulator including a two-mode operational amplifier that produces an output signal that controls a shunt current through the shunt switch. At power-up, or at low load conditions, the operational amplifier operates in a low-power mode of operation with low quiescent current. When a current comparator circuit senses that the shunt current exceeds a predetermined level, the current comparator circuit sets a latch which produces a logical signal that causes the operational amplifier to switch to a high-power mode of operation.