Abstract: A control device is configured to, when the direct current output voltage of a resonant DC-DC converter is of a value that exceeds the maximum value that can be output in a fixed frequency control region, there is a switch from fixed frequency control to frequency modulation control. Because of this, conduction loss and turn-off loss caused by backflow current among semiconductor switching elements of the resonant DC-DC converter are reduced, power conversion efficiency is improved, and the range of voltage that can be output by the resonant DC-DC converter is expanded.

Abstract: Embodiments provide an apparatus for controlling conversion between an alternating current and a direct current, including a rectifier circuit, a detection circuit, and a logic circuit, where the detection circuit includes a voltage divider module, a first comparator module, and a second comparator module.

Abstract: A Low Forward Voltage Rectifier (LFVR) includes a bipolar transistor, a parallel diode, and a base current injection circuit disposed in an easy-to-employ two-terminal package. In one example, the transistor is a Reverse Bipolar Junction Transistor (RBJT), the diode is a distributed diode, and the base current injection circuit is a current transformer. Under forward bias conditions (when the voltage from the first package terminal to the second package terminal is positive), the LFVR conducts current at a rated current level with a low forward voltage drop (for example, approximately 0.1 volts). In reverse bias conditions, the LFVR blocks current flow. Using the LFVR in place of a conventional silicon diode rectifier in the secondary of a flyback converter reduces average power dissipation and increases power supply efficiency.

Abstract: A circuit configured to detect the conduction of a first body diode and a second body diode of the first and second synchronous rectification transistors is provided. The circuit includes a low-pass filter configured to generate a filtered voltage by receiving a detection voltage based on a drain voltage of the first synchronous rectification transistor and low-pass filtering the received drain voltage, a first comparator configured to compare whether the filtered voltage is higher than the detection voltage, and a second comparator configured to compare whether the detection voltage is higher than the filtered voltage. A time point of ending a first synchronous rectification conduction interval of the first body diode and a time point of a second synchronous rectification conduction interval of the second body diode are determined, according to outputs from the first and second comparators.

Abstract: A synchronous rectifier controlling module includes a signal-processing unit and a plurality of driving units, the signal-processing unit is coupled with a secondary winding of a power transformer, and the driving units are electrically connected to a plurality of switch groups, each switch group includes a plurality of power switches. The signal-processing unit measures a current flowing through the secondary winding and determined operation mode of each of the power switches. When the current is increased from a first determined level to the second determined level, the synchronous rectifier controlling module makes an amount of the power switches of each of the switch groups turn on and off by following the driving signal increase accordingly.

Abstract: A power electronic converter (30), for connecting AC and DC networks (46,44) and transferring power therebetween, comprises: first and second DC terminals (32,34) defining a DC link for connection to a DC network (44); wherein, in use, the DC link has a reversible DC link voltage applied thereacross; at least one converter limb (36) extending between the first and second DC terminals (32,34) and having first and second limb portions (38,40) separated by an AC terminal (42) for connection to an AC network (46), each limb portion (38,40) including at least one rationalized module (52) having first and second sets of series-connected current flow control elements (54) connected in parallel with at least one energy storage device (56), each set of current flow control elements (54) including a primary active switching element to selectively direct current through the energy storage device (56) and a primary passive current check element to limit current flow through the rationalized module (52) to a single direct

Abstract: A method for operating an inverter and an inverter operating according to the method is disclosed, wherein the inverter is controlled in accordance with line-angle-specific control sets provided in a database, wherein a switchover from one control set to the next control set can be performed only in a direction of rotation of a space vector resulting from a respective line angle.

Abstract: A transistor device includes at least one transistor cell. The cell includes a drift region, a source region, a body region arranged between the source region and the drift region, and a drain region. The drift region is arranged between the body region and the drain region. A gate electrode is adjacent the body region and dielectrically insulated from the body region by a gate dielectric. A channel region of a doping type complementary to a doping type of the drain region is arranged between the drift region and the drain region. A drift control region is adjacent the drift region and dielectrically insulated from the drift region and the channel region by a drift control region dielectric. A first switch is coupled between the drift control region and the drain region.

Abstract: A switching power supply apparatus which receives AC voltage and includes: a transformer including a primary winding and a secondary winding; a first bidirectional switch connected in series with the primary winding; and a Snubber circuit connected in parallel with the primary winding. The AC voltage is applied to a series circuit which includes the primary winding and the first bidirectional switch. The Snubber circuit includes a second bidirectional switch for controlling the first bidirectional switch.

Abstract: Systems and methods for providing a self-driven synchronous rectification circuit for an active-clamp forward converter which includes automatically enhancing synchronous MOSFETs and maximizing input voltage range. The gate signals for the synchronous MOSFETs are derived from a unipolar magnetic coupling signal instead of a bipolarized magnetic coupling signal. The unipolar signal is retained for fully enhanced driving of the MOSFETs at low line voltage and the unipolar signal is automatically converted to a bipolar signal at high line amplitude due to line variance to maximize input voltage range by utilizing non-polarized characteristics of the MOSFET gate-to-source voltage (Vgs). The circuit permits efficient scaling for higher output voltages such as 12 volts DC or 15 volts DC, without requiring extra windings on the transformer of the forward converter.

Abstract: In some aspects of the invention, a zero current detecting circuit of a switching power supply device detects a gradient of the current flowing in an inductor in the OFF state of the switching element and detects the timing at which the current through the inductor becomes zero corresponding to the detected gradient of the inductor current. Specifically, the zero current detecting circuit receives a signal for controlling ON/OFF driving of the switching element and a voltage signal proportional to the current flowing through the inductor in an OFF state of the switching element. The voltage signal can be compared sequentially with first and second comparison reference voltages to control charging and discharging of a capacitor. Further, the zero current detecting circuit can detect a timing at which the charging and discharging voltage of the capacitor as the timing of zero current flowing through the inductor.

Abstract: A power factor improvement circuit is configured with two series circuits each having a switching element and a rectifying element connected in series. Two input terminals of a single-phase AC power source are respectively connected between the switching elements and the rectifying elements in the series circuits. An inductor element is connected between an output terminal of the power factor improvement circuit and two terminals, which are on the other side of the rectifying elements, of the switching elements. A capacitor element is connected between the output terminal and the two terminals. According to the above configuration, it is possible to decrease a loss of a bridge circuit and common-mode noise, and to provide a power factor improvement circuit in a smaller size.

Abstract: A drive transformer isolated-adaptive drive-circuit includes a power supply, a first MOSFET and a second MOSFET, the drain electrode of the first MOSFET coupled with the positive electrode of the power supply, and the source electrode of the first MOSFET coupled with the drain electrode of second MOSFET; the source of the second MOSFET coupled with the negative electrode of the power supply; a drive transformer having a first winding and a second winding; a first fast drive circuit, one end coupled with the first winding, the other end coupled with the first MOSFET; a second fast drive circuit, one end coupled with the second winding, the other end coupled with the second MOSFET; a first adaptive-dead-time control sub-circuit; and a second adaptive-dead-time control sub-circuit.

Abstract: For signal luminaires which indicate the term STOP or DANGER upon activation, a circuit containing a first operating case feed unit and a second auxiliary source is provided for the purpose of supplying a reliable power supply. In this case, the second auxiliary source is inductively coupled to the signal luminaire electric circuit; while the signal luminaires are capacitively coupled to ground. The use of switches during operation in a fall-back level is obviated in this way.

Abstract: An AC-to-DC converter circuit includes DC-to-DC converter that in turn includes a secondary side circuit. The secondary side circuit includes a secondary winding, a pair of bipolar transistor-based self-driven synchronous rectifiers, a pair of current splitting inductors, and an output capacitor. Each of the synchronous rectifiers includes a bipolar transistor and a diode whose anode is coupled to the transistor collector and whose cathode is coupled to the transistor emitter. The current splitting inductors provide the necessary base current to the bipolar transistors at the appropriate times such that the bipolar transistors operate as synchronous rectifiers.

Abstract: A bridgeless power factor improvement converter is configured with input terminals for an AC voltage, output terminals from for a DC output voltage, diodes, first through fourth switches, and coils. A control circuit selectively switches the first through fourth switches according to the AC voltage, a first dead time period (the third switch OFF/the fourth switch ON) in which the first and second switches are in a dead time including a zero-cross point from a positive period to a negative period, and a second dead time period (the third switch ON/the fourth switch OFF) in which the first and second switches are in the dead time including the zero-cross point from the negative period to the positive period. The control circuit maintains the third and fourth switches in the OFF state during a period other than the first and second dead periods.

Abstract: A switching power supply device includes a full-bridge circuit comprising a plurality of switching devices, a transformer comprising a primary coil and a secondary coil, the primary coil being connected to an output of the full-bridge circuit, and a DC/DC converter comprising a rectifier circuit. The rectifier circuit includes a plurality of diodes and is connected to the secondary coil to rectify a voltage outputted from the secondary coil. A snubber circuit includes a first snubber diode connected to an intermediate point of the secondary coil, a second snubber diode connected in series with the first snubber diode, the second snubber diode being connected to one end of an output capacitor, and a snubber capacitor connected between a node between the first and second snubber diodes and a positive side output of the rectifier circuit.

Abstract: A circuit includes a conduction detector configured to monitor conduction of a body diode of a synchronous rectifier switch relative to a predetermined threshold and to generate a detector output that indicates conduction or non-conduction of the body diode. A window analyzer is configured to generate a timing signal to indicate if the synchronous rectifier switch is turned off prematurely or turned off late relative to an on-time turn off based on the detector output from the conduction detector. A controller is configured to adjust the timing of the synchronous rectifier switch based on whether the timing signal indicates that the synchronous rectifier switch is turned off prematurely or turned off late relative to the on-time turn off.

Abstract: A rectifier includes two input paths configured to receive an alternating input voltage, two output paths configured to provide a direct output voltage, and an auxiliary output path configured to provide an auxiliary output voltage. At least two rectifying paths are connected between each of the input and output paths. At least two rectifying paths are switched-mode rectifying paths that are connected to the same output path. The two switched-mode rectifying paths are configured to connect one output path to one input path during one half wave of the input voltage, and to connect the one output path to the other input path during the other half wave. The two switched-mode rectifying paths each comprise two semiconductor elements with controllable paths that are series-connected with each other by an auxiliary output node. At least one rectifier element is connected between the auxiliary output and the two auxiliary output nodes.

Abstract: A sampling circuit for current transformer includes a current sensing unit, a rectification unit, a sampling unit and a switching unit. The rectification unit is electrically connected to the current sensing unit. The sampling unit is electrically connected to the rectification unit and outputs a first signal. The sampling unit includes an energy leakage device and a switching device. The switching device is electrically connected to the energy leakage device in parallel, and is turned on or off according to a second signal and a third signal. The switching unit is electrically connected to the sampling unit, and is turned on or off according to the second signal.

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: An example embodiment relates to a switched-mode power supply comprising a transformer with a first winding and a second winding. There is a transmitter configured to: detect a detectable variable (Vout) at the first winding, generate a transformer relayed signal in accordance with the detectable variable (Vout), and provide the transformer relayed signal to the first winding. A receiver is configured to: receive the transformer relayed signal from the second winding, and control a controllable variable at the second winding in response to the transformer relayed signal, wherein the transformer relayed signal is a symbol stream comprising a plurality of symbols.

Abstract: Provided is a synchronous rectifier circuit which, even if a synchronous rectification element having a low on-resistance is used, can perform a synchronous rectifying operation without being influenced by the inductance component. It is a synchronous rectifier circuit having a synchronous rectification element QSR1 and a synchronous rectification control circuit IC1 for turning on/off the synchronous rectification element QSR1 in accordance with the current iSR flowing through the synchronous rectification element QSR1, including a current detection circuit for detecting the current iSR flowing through the synchronous rectification element QSR1 during an on-period of the synchronous rectification element QSR1 as a synchronized voltage waveform, the synchronous rectification control circuit IC1 being configured so as to turn off the synchronous rectification element QSR1 on the basis of the voltage waveform detected by the current detection circuit 1a.

Abstract: The invention relates to a method for actuating the switching transistors of a rectifier which is provided for converting the phase voltages that are provided by a vehicle generator into a direct current voltage. Each switching transistor comprises a parasitic diode. An activation signal for initiating the conducting phase and a de-activation signal for ending the conducting phase are supplied to each control terminal of the switching transistors. A timer is started simultaneously with the provision of an activation signal and the de-activation signal is provided once a predetermined time period has passed.

Abstract: The invention is a control method and a control device for determining components of a control voltage of an inverter adapted for feeding power to a grid, in the course of which a vector direction (?*) of a voltage of the grid is determined, on the basis of active power and reactive power of the grid, current reference signal components (id,ref, iq,ref) are determined, Park vector components (ix, iy) are generated by Park transformation from components (i1, i2, i3) associated with phases of a current of the inverter, the current reference signal components (id,ref, iq ref) are transformed into the transformed current reference signal components (ix,ref, iy,ref) on the basis of the vector direction (?*), a first error signal is generated by leading the first component (ix) of the Park vector and the first component (ix ref) of the transformed current reference signal to a first subtracting unit (77), and a second error signal is generated by leading the second component (iy) of the Park vector and the second c

Abstract: An electric power conversion device comprises a conversion circuit having bi-directionally switchable plural pairs of switching elements connected to respective phases and converting an inputted AC power into an AC electric power. A first switching time is calculated using detected voltages detected by voltage sensors and an output command value. A second switching time is calculated using a carrier and the first switching time. A control signal generating section generates control signals to switch on and off of the switching elements using the first switching time and second switching time. In a case where a state is transited from the first switching time to the second switching time, a controller turns off one of on a state switching elements of either one of an upper arm circuit or a lower arm circuit and maintains on state of the other of the on state switching elements of the other arm circuit.

Abstract: An electric power supply apparatus, which enables a driving frequency of a switching circuit connected to a primary side of a transformer constant and output of a secondary side variable, comprises a transformer (5), a series circuit of two first switching elements (Q1, Q2) connected between terminals of a direct current power supply (2), an LC resonant circuit connected between both ends of one of the first switch element (Q2) and a primary winding (Np) of the transformer (5), bidirectional switch elements (Q3, Q4) connected to secondary windings (Ns1, Ns2) of the transformer (5) and having a rectification function and a phase control function, and a control circuit for inputting gate driving signals having a phase difference into the first switch elements (Q1, Q2) and the second switch elements (Q3, Q4).

Abstract: A semiconductor device according to one embodiment includes first and second transistor columns which each include a NMOS transistor and a PMOS transistor which are connected in series between a first power wire and a second power wire. Further, a gate of the PMOS transistor of one transistor column is connected to a wire which connects the NMOS transistor and the PMOS transistor of the other transistor column. Furthermore, an AC signal obtained by superimposing a signal on a bias voltage which is a voltage lower than that of the gate of the PMOS transistor included in the same transistor column is supplied to the gate of the NMOS transistor included in the transistor column.

Abstract: A hybrid diode-less power converter topology of the present invention converts power from an AC power source to a variable load with high efficiency. The power converter includes a non-symmetrical arrangement of rectifying switches for rectifying an input AC voltage and shaping switches for shaping an input AC current. The shaping switches are operated in Continuous Conduction Mode (CCM) based on an input AC current. Operation of each of the rectifying switches and shaping switches are further controlled wherein a commutation time for the shaping switches is associated with a first voltage rise and fall time (e.g., less than 10 ns), and a commutation time for the rectifying switches is associated with a second voltage rise and fall time (e.g., at least 100 ns), wherein the first voltage rise and fall time is less than the second voltage rise and fall time by a factor of nine or more.

Abstract: The present invention relates to a circuit for emulating a current via a power inductor of a DC-to-DC converter. The circuit is able to generate a first signal and detect or emulate the constant component of the current by using a power inductor. The circuit is also able to generate a second signal or components of a second signal and emulate an alternating component of the current by using the power inductor. The circuit also is able to splice the first and second signal or the first signal and components of the second signal into a signal which at least partially emulates the current via the power inductor. The circuit able to generate a first signal may include a current sensing resistor connected to the power inductor and a first capacitor, and to a first input and output.

Abstract: Low-voltage outputs are provided by full-bridge rectification using controlled switches with fault detection monitoring of circuit conditions and disabling switches upon detection of a fault to decouple the converter from the system. Common-source dual MOSFET devices include elements arranged in alternating patterns on the die. Common-source dual synchronous rectifiers include control circuitry powered from the voltage across the complementary switch. A DC-to-DC transformer converts power using a fixed voltage transformation ratio. A clamp phase may be used to reduce power losses, control the output resistance, effectively regulate the voltage transformation ratio, provide narrow band output regulation, and control the rate of change of output voltage. A new point of load converter includes input driver circuitry removed from and output circuitry located at the point of load, with a transformer located near the output circuit and an AC bus between the driver circuit and the primary winding of the transformer.

Abstract: A Low Forward Voltage Rectifier (LFVR) includes a bipolar transistor, a parallel diode, and a base current injection circuit disposed in an easy-to-employ two-terminal package. In one example, the transistor is a Reverse Bipolar Junction Transistor (RBJT), the diode is a distributed diode, and the base current injection circuit is a current transformer. Under forward bias conditions (when the voltage from the first package terminal to the second package terminal is positive), the LFVR conducts current at a rated current level with a low forward voltage drop (for example, approximately 0.1 volts). In reverse bias conditions, the LFVR blocks current flow. Using the LFVR in place of a conventional silicon diode rectifier in the secondary of a flyback converter reduces average power dissipation and increases power supply efficiency.

Abstract: A drive circuit for a synchronous rectifier, a method of driving a synchronous rectifier and a power converter incorporating the drive circuit or the method. In one embodiment, the drive circuit includes: (1) a first drive circuit stage configured to derive a timing for at least one drive signal from a secondary winding of a transformer coupled to the synchronous rectifier and (2) a second drive circuit stage, coupled to the first drive circuit stage and configured to employ a substantially stable voltage source to provide power for the at least one drive signal and apply the at least one drive signal to at least one control terminal of at least one synchronous rectifier switch in the synchronous rectifier.

Abstract: A motor drive system wherein an LC circuit exists between an inverter and a motor is such that switching of semiconductor switching elements Su to Sw and Sx to Sz configuring the inverter is controlled by an on-signal formed of a first on-signal, a second on-signal, and an off-state period of a time the same as the first on-signal provided between the first on-signal and second on-signal, and by an off-signal formed of a first off-signal, a second off-signal, and an on-state period of a time the same as the first off-signal provided between the first off-signal and second off-signal, and surge voltage applied to an input terminal of the motor is suppressed by the time of the first on-signal and the time of the second off-signal being set to one-sixth of a resonance cycle specific to the LC circuit.

Abstract: A DC-DC converter in which a primary side and a secondary side are insulated by a transformer, includes: two diodes having anodes respectively connected to both ends of a secondary winding of the transformer and cathodes connected to each other; a series circuit composed of a resistor and a capacitor connected in series; and a snubber circuit formed by connecting the cathodes of the diodes to the connection point between the resistor and the capacitor. Surge voltage caused on the secondary side of the transformer is clamped at the voltage of the capacitor, and surge energy stored in the capacitor is regenerated to a load via the resistor. Thus, surge voltage caused on the secondary side of the transformer is suppressed with a simple configuration, and effective use of surge energy is ensured.

Abstract: A control system for a power drive section of a three-phase system is disclosed. The control system comprises a positive sequence channel, a negative sequence channel, and a zero sequence channel. The positive sequence channel processes positive sequence error signals, the negative sequence channel processes negative sequence error signals, and the zero sequence channel processes zero sequence error signals. Each sequence channel includes a harmonic repetitive controller, a repetitive controller compensator, and a fundamental frequency controller configured to operate in parallel with the harmonic repetitive controller and repetitive controller compensator. Both the repetitive controller compensator of the negative sequence channel and the repetitive controller compensator of the positive sequence channel are configured with the same, first frequency response.

Abstract: A two-phase interleaved converter includes two sub-circuits, a voltage controller, a current controller, a balancing controller and a phase shifter. The voltage controller receives the output voltage of the two sub-circuits and outputs a signal in proportion to the level of the output voltage. The current controller receives the output signal of the voltage controller and an inductor current from one of the two sub-circuits and outputs a control signal that controls one of the two sub-circuits which is in charge of one phase. The balancing controller receives values of currents output from the two sub-circuits and calculates a difference between the values of the currents output from the two sub-circuits to control a duty ratio of the control signal applied to one of the two sub-circuits. The phase shifter shifts a phase of the control signal output from the balancing controller.

Abstract: A method of compensating for reverse current leakage in an active rectifier may include advancing an output of a comparator by a predetermined period of time by applying a predetermined offset voltage to a reference voltage input to the comparator, and activating a switch based on the output of the comparator. The method may also include deactivating the switch when a predetermined time delay elapses from a point in time at which the switch was activated.

Abstract: A high voltage full wave rectifier and doubler circuit having complementary serially connected low voltage MOSFET stacks to provide high voltage capability. The state of the MOSFETs in the MOSFET stacks is controlled by means of resistors coupled between the circuit's outputs and a time varying input signal. The resistance values of the resistors are selected to maintain operation of the stacked MOSFETs below their breakdown voltages.

Abstract: A Low Forward Voltage Rectifier (LFVR) circuit includes a bipolar transistor, a parallel diode, and a capacitive current splitting network. The LFVR circuit, when it is performing a rectifying function, conducts the forward current from a first node to a second node provided that the voltage from the first node to the second node is adequately positive. The capacitive current splitting network causes a portion of the forward current to be a base current of the bipolar transistor, thereby biasing the transistor so that the forward current experiences a low forward voltage drop across the transistor. The LFVR circuit sees use in as a rectifier in many different types of switching power converters, including in flyback, Cuk, SEPIC, boost, buck-boost, PFC, half-bridge resonant, and full-bridge resonant converters. Due to the low forward voltage drop across the LFVR, converter efficiency is improved.

Abstract: A bridge-less step-up switching power supply device includes (i) a first and a second reactor having: a first and a second main winding connected to a first and a second input terminal, respectively; and a first and a second auxiliary winding magnetically coupled to the first main winding and connected to the first and second main windings, the first and second auxiliary windings having a first and a second leakage inductance, respectively; (ii) a first and a second diode connected between the first and second auxiliary windings and a first output terminal, respectively; (iii) a first capacitor connected between the first output terminal and a second output terminal; (iv) a second capacitor connected between a connection point of a third switch and a fourth switch, and the first output terminal; and (v) a controller for controlling turning on/off of first to fourth switches.

Abstract: A power supply for a load control device generates a DC voltage and provides an asymmetrical output current, while drawing a substantially symmetrical input current. The power supply comprises a controllably conductive switching circuit for controllably charging an energy storage capacitor across which the DC voltage is produced. The energy storage capacitor begins charging at the beginning of a half-cycle and stops charging after a charging time in response to the magnitude of the DC voltage and the amount of time that the energy storage capacitor has been charging during the present half-cycle. The charging time is maintained substantially constant from one half-cycle to the next. The power supply is particularly beneficial for preventing asymmetrical current from flowing in a multiple location load control system having a master load control device supplying power to a plurality of remote load control devices all located on either the line-side or the load-side of the system.

Abstract: A switching arrangement for triggering a semiconductor switching element with a first electrode, a second electrode and a control electrode includes: a pulse generator for generating a control voltage input signal; a bias voltage capacitor; a first electrical resistor electrically connected in series with the bias voltage capacitor between first and second terminals of the pulse generator, wherein the control electrode is electrically connected to the bias voltage capacitor and the first electrical resistor, and the first electrode is electrically connected to the pulse generator and the first electrical resistor; and an additional capacitor connected in series to the pulse generator, the first electrical resistor, and the bias voltage capacitor.

Abstract: The present disclosure relates to a synchronous rectification circuit adapted to an electronic transformer. Operation states of four transistor switches in the synchronous rectification circuit are adjusted in accordance with a detected input voltage signal of the synchronous rectification circuit to achieve synchronous rectification. Moreover, the transistor switches in a rectifier bridge and a switching control circuit are all integrated into a single chip to have an increased integration level, a reduced chip size, and high efficiency. The present disclosure also relates to a switching power supply comprising the above synchronous rectification circuit.

Abstract: A power converter for an engine generator includes an insulative support that receives and supports circuit components for converting incoming AC power to desired power, such as power suitable for a welding application. One or more rectifier modules are provided that are received and supported by the support. Three such modules may be provided for receiving three phase power from a generator. DC power from the rectifier module is applied to DC bus plates. The plates may be coupled to capacitors. A power conversion circuit, such as a buck converter, is coupled to the DC bus plates to convert the DC power to output power.

Abstract: A controller outputs a pulse signal to a first switch and a second switch on the basis of a circuit current flowing through a power conversion circuit and a voltage of an alternating-current power supply. The first switch and the second switch alternately open and close. According to the opening and closing, an electric current in which a high-frequency current is mixed with a low-frequency component of the alternating-current power supply flows to the power conversion circuit.

Abstract: An induction heating system includes an induction heating coil operable to inductively heat a load with a magnetic field, a detector for detecting a current feedback signal corresponding to a current flowing through the induction heating coil, and a controller for detecting a switching transient in the current feedback signal and determining a resonant frequency of the system based on a characteristic of the switching transient.

Abstract: The motor (1) of the present invention is fed by the mains voltage (Vac), and comprises a main winding (MW), an auxiliary winding (AW), a first triac (2) connected in series to the auxiliary winding (AW) which provides to start up the motor (1) by being actuated at the moment of start up in order to operate the motor (1), a second triac (3) connected in series to the main winding (MW) which provides the motor (1) to continue operating and a control unit (4) which controls the start up and operation of the motor (1) by actuating the triacs (2 and 3) when required.

Abstract: Various active diode circuits are described. In one example, there is provided an active diode circuit having an active diode and a control circuit. The active diode includes an anode terminal, a cathode terminal and a control terminal. The control circuit is configured to generate a control current of the active diode on the control terminal proportional to the diode current of the active diode. The control circuit is also configured to control the diode voltage of the active diode below a predetermined threshold.

Abstract: A rectifier circuit includes first and second load terminals, a first semiconductor device having a load path and configured to receive a drive signal, and a plurality of second semiconductor devices each having a load path and each configured to receive a drive signal. The load paths of the second semiconductor devices are connected in series, and connected in series to the load path of the first semiconductor device. A series circuit with the first semiconductor device and the second semiconductor devices is connected between the load terminals. Each of the second semiconductor devices is configured to receive as a drive voltage either a load-path voltage of at least one of the second semiconductor devices, or a load-path of at least the first semiconductor device. The first semiconductor device is configured to receive as a drive voltage a load-path-voltage of at least one of the second semiconductor devices.