Abstract: A reactor includes a plurality of windings, a coupling core, and an inductor core. A coupling core configured to form a coupling closed magnetic circuit that magnetically couples the plurality of windings, the plurality of windings being wound around the coupling core; and. An inductor core, which includes a main part, a first projection part projecting from one end of the main part, and a second projection part projecting from another end of the main part, and each of the first projection part and the second projection part is magnetically connected to the coupling core. The inductor core forms an inductor closed magnetic circuit together with a part of the coupling core around which one winding of the plurality of windings is wound.

Abstract: The present disclosure relates to a motor control device and method. The motor control device includes an inverter for driving a motor, a first shunt resistor connected to a first low-side switching element included in the inverter, a second shunt resistor connected to a second low-side switching element included in the inverter, a DC-link shunt resistor in series with the inverter, and a controller for controlling the inverter based on first current value measured through the first and second shunt resistors and a second current value measured through the DC-link shunt resistor.

Abstract: A motor control system includes a VFD unit comprising a rectifier circuit having a plurality of phase legs each including thereon an upper switching unit and a lower switching unit, an inverter connected to the rectifier circuit by way of a DC link and having a plurality of switches therein controllable to provide a three-phase AC output power to a load, and a bypass relay unit comprising a bypass relay coupled to each of the phase legs of the rectifier circuit downstream from the lower switching unit. An isolation contactor unit is positioned between the inverter and the load and operable to selectively connect/disconnect the inverter to/from the load. The bypass relay unit is operable in a first and second positions to couple the rectifier circuit to the inverter and to couple the rectifier circuit to a bypass path that bypasses the inverter.

Abstract: A method for protecting data in a storage system is disclosed. In one embodiment, such a method includes detecting, by a first hardware management console, first battery-on status associated with a first uninterruptible power supply. The method further detects, by a second hardware management console, second battery-on status associated with a second uninterruptible power supply. The method communicates, from the first hardware management console to the second hardware management console, the first battery-on status. The method then triggers, by the second hardware management console, a dump of modified data from memory to more persistent storage upon detecting both the first battery-on status and the second battery-on status. A corresponding system and computer program product are also disclosed.

Abstract: A gateway system for a building comprises: a first relay to couple a first line of the gateway system to a first grid line of a power grid; a second relay to couple a second line of the gateway system to a second grid line of the power grid; a neutral line coupled to a neutral grid line of the power grid; a first electric-vehicle (EV) line coupled to the first line of the gateway system, the first EV line configured for being coupled to a first line of an EV charging connector; a second EV line coupled to the second line of the gateway system, the second EV line configured for being coupled to a second line of the EV charging connector, wherein the EV charging connector has no neutral line; and a balancing converter coupled to the first and second lines of the gateway system.

Abstract: A semiconductor module arrangement includes a housing and at least one pair of semiconductor substrates arranged inside the housing. Each pair of semiconductor substrates includes first and second semiconductor substrates. The first semiconductor substrate includes a first dielectric insulation layer arranged between a first metallization layer and a third metallization layer, and a second dielectric insulation layer arranged between the third metallization layer and a second metallization layer. The second semiconductor substrate includes a first dielectric insulation layer arranged between a first metallization layer and a third metallization layer, and a second dielectric insulation layer arranged between the third metallization layer and a second metallization layer.

Abstract: A power apparatus applied in a solid state transformer structure includes an AC-to-DC conversion unit, a first DC bus, and a plurality of bi-directional DC conversion units. First sides of the bi-directional DC conversion units are coupled to the first DC bus. Second sides of the bi-directional DC conversion units are configured to form at least one second DC bus, and the number of the at least one second DC bus is a bus number. The bi-directional DC conversion units receive a bus voltage of the first DC bus and convert the bus voltage into at least one DC voltage, or the bi-directional DC conversion units receive at least one external DC voltage and convert the at least one external DC voltage into the bus voltage.

Abstract: The invention relates to a method and to a device for operating a bidirectional voltage transformer connectable to a primary battery and having a primary-side smoothing capacitor, an inductive transformer, and a secondary-side clamping capacitor, wherein, before the primary battery is connected, a voltage at the primary-side smoothing capacitor is matched to a voltage of the primary battery by a cyclical transfer of charge from the secondary-side clamping capacitor. The voltage of the primary-side smoothing capacitor is matchable in this way to the voltage of the primary battery before the primary battery is connected, and current spikes thus avoided during connection of the primary battery.

Abstract: An apparatus having an AC rectifier configured to generate one or more rectified signals from an alternating current (AC) signal, bus having a positive line and a negative line, parallel converter connected between the positive line and the negative line, and bulk capacitor coupled to the parallel converter. The bus is connected to the AC rectifier to receive a first of the rectified signals between the positive line and the negative line. The apparatus has a controller configured to operate the parallel converter in a first mode in which energy from a second of the rectified signals from the AC rectifier is stored in the bulk capacitor and a second mode in which the energy stored in the bulk capacitor is discharged to the bus to increase a voltage on the bus during at least an initial portion of the second mode.

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 at least one primary winding selected from said plurality of transformers, wherein the inductive element restricts variation in inductance for said plurality of transformers and power outputs in operation.

Abstract: A charging system including an accumulator, a use of an MPP tracking method for charging an accumulator, and a method for charging an accumulator with the aid of a charging system, the charging system including a voltage source, a converter, and a rectifier, the current supplied and/or driven by the voltage source being supplied to the DC-voltage-side terminal of a converter, the converter having semiconductor switches, which are controllable in a pulse-width modulated manner, in order to generate an output-side AC voltage, the output-side AC voltage feeding a rectifier, whose output-side voltage, especially rectified voltage, functioning and/or acting as charging voltage for the accumulator, an arrangement for detecting the output current of the inverter being situated in the converter, the effective value of the output current in particular corresponding to the charge current of the converter, a current limiting arrangement of the converter limiting the output current of the inverter to a current value such

Abstract: The disclosure provides a multilevel port under-voltage protection circuit with flying capacitor, comprising: a first circuit unit having first to fourth power switches sequentially connected in series, wherein the first circuit unit is arranged a positive terminal and a negative terminal of a DC input port and each of the switches can tolerate a reverse current; a first flying capacitor having a first terminal connected to the common node of the first power switch and the second power switch in series, and a second terminal connected to the common node of the third power switch and the fourth power switch in series; and a first shunt element connected in antiparallel to the first power switch or the fourth power switch, wherein a pulse peak current tolerated by the first shunt element is greater than the reverse current tolerated by the first power switch or the fourth power switch.

Abstract: Techniques for achieving a variety of selected direct current (DC) voltage outputs are disclosed. In one embodiment, a power generation system includes at least one multi-phase generator configured to generate an alternating current (AC) voltage. A plurality of diode rectifier circuits is coupled to the at least one multi-phase generator, which are configured to receive the AC voltage and convert the AC voltage to a DC voltage output. The power generation system includes configuration circuitry coupled to the plurality of diode rectifier circuits configured to configure the diode rectifier circuits in multiple configurations. For example, the configuration circuitry can configure the diode rectifier circuits in a series configuration to achieve a first DC voltage level, a parallel configuration to achieve a second DC voltage level, or a mixed series-parallel configuration to achieve a third DC voltage level.

Abstract: Methods and systems for controlling a multipurpose power converter for converting power for a transport climate control system are provided. The multipurpose power converter includes a rectifier having a first leg, a second leg, and a third leg. The multipurpose power converter also includes a first switch, a second switch, and an inductor-capacitor network. The first switch and the second switch are connected to the third leg. The inductor-capacitor network is connected to the first switch. When the first switch is on and the second switch is off, the multipurpose power converter is configured as a single-phase AC power converter. When the first switch is off and the second switch is on, the multipurpose power converter is configured as a three-phase AC power converter.

Abstract: The present invention provides an electric power conversion device and an electric power generation system which are capable of suppressing ripples in a detected voltage and detection delay.

Abstract: System and methods for power conversion are provided. Aspects include a first switching module comprising a first set of switches, wherein the first set of switches comprise wide-bandgap devices having a first bandgap, a second switching module comprising a second set of switches, wherein the second set of switches comprise semiconductor devices having a second bandgap, and wherein the first bandgap is larger than the second bandgap, an alternating current (AC) power source connected to the first switching module and the second switching module, a first capacitor bank, a second capacitor bank, and a controller configured to operate the first switching module and the second switching module to create a first direct current (DC) voltage across the first capacitor bank and a second direct current (DC) voltage across the second capacitor bank.

Abstract: A modular power converter with wide-bandgap semiconductors, in particular SiC semiconductors. The modular power converter has at least two base units. The base units are connected together on the input side, and each base unit has an input circuit on the input side and an output circuit on the output side. The input circuit and the output circuit are each formed by the wide-bandgap semiconductors arranged in a B6-bridge circuit. An intermediate circuit capacitor is connected in parallel with the input circuit and the output circuit forming an intermediate circuit. The input circuits of the base units or a sub-quantity of the base units are arranged in a series circuit. At least one inductor is arranged between each pair of input circuits.

Abstract: A method for protecting data in a storage system is disclosed. In one embodiment, such a method includes detecting, by a first rack power controller, first battery-on status associated with a first uninterruptible power supply. The method further detects, by a second rack power controller, second battery-on status associated with a second uninterruptible power supply. The method communicates, from the first rack power controller to the second rack power controller, the first battery-on status. The method then triggers, by the second rack power controller, a dump of modified data from memory to more persistent storage upon detecting both the first battery-on status and the second battery-on status. A corresponding system and computer program product are also disclosed.

Abstract: A motor driver apparatus includes: a converter including a first electrical network configured to convert AC electrical power into DC electrical power, the first electrical network including at least one electronic element that includes a wide bandgap semiconductor material; and an inverter electrically connected to the converter, the inverter including a second electrical network configured to generate an AC motor power signal from the DC electrical power, the second electrical network includes a plurality of electronic elements that include a semiconductor material that is not a wide bandgap semiconductor material.

Abstract: A zero-sequence current balancer for a controlling zero-sequence current in a three-phase power system includes a cascade multilevel modular inverter (CMMI) coupled to the three-phase power system, wherein the CMMI has a plurality of modules, each module having a module capacitor, and a real power injector circuit provided between the three-phase power system and the CMMI, wherein the real power injector circuit is structured and configured to cause real power to injected into and/or absorbed from the CMMI to regulate a voltage of one or more of the module capacitors.

Abstract: A power conversion device which includes an input terminal that receives a rectified AC power, an active power factor correction circuit including a switching element that turns on or off and boosts an input voltage to correspond to a turn on time, an output terminal connected to an output of the active power factor correction circuit. The power conversion device includes a comparator that compares an output voltage of the output terminal with a reference voltage and outputs a signal having a different magnitude depending on the comparison result, a control circuit that adjusts a duty cycle of the control signal depending on an output signal of the comparator, and a discharge circuit electrically connected between the input terminal and an output of the comparator, and when the input voltage is equal to or greater than a first specified voltage, that discharges the output of the comparator.

Abstract: An uninterruptible power supply system includes: at least one AC input terminal; an AC output terminal; an DC input terminal; at least one uninterruptible power supply (UPS) device having: a DC link; a DC/AC converter connecting on a first side to the DC link and on a second side to the AC output terminal; and a DC/DC converter connecting on a first side to the DC input terminal and on second side to the DC link. The uninterruptible power supply system further includes at least two switches; and at least one coupled differential mode inductor having two windings. Each switch of the at least two switches is connected in series with at least one winding of the at least one coupled differential mode inductor forming a series connection. The series connection is connected on a first side to the at least one AC input terminal.

Abstract: A controller (203) comprises a processing system (205) for controlling a power electronic converter during a short circuit taking place in a direct voltage side of the power electronic converter. The processing system recognizes a direction of current in a phase (126-128) of an alternating voltage side of the power electronic converter, sets a high-leg controllable switch (108-110) of the phase to a conductive state while keeping a low-leg controllable switch (111-113) of the phase in a non-conductive state when the recognized direction of the current is outwards from the power electronic converter, and otherwise sets the low-leg controllable switch to the conductive state while keeping the high-leg controllable switch in the non-conductive state. Thermal loadings of freewheeling diodes (114-119) of the power electronic converter are reduced since currents needed to burn input fuses (122) of the power electronic converter are shared between the controllable switches and the freewheeling diodes.

Abstract: An apparatus includes a controlled field alternator or utility source of electrical power, a conversion device, and a controller. The conversion device includes a first power input associated with a first power source, a second power input associated with a second power source, and circuitry configured to perform a first conversion of power from a first format from the first power source to a second format for charging the second power source and perform a second conversion of power from the second format for the second power source to a third format for supplying a load.

Abstract: In response to a problem wherein a voltage of a capacitor of a power conversion device decreases when a voltage of an alternating current power supply is restored after once decreasing, the voltage of the capacitor drops below a maximum value of the voltage of the alternating current power supply when power is restored, and an inrush current occurs, the power conversion device, provided between an alternating current power supply and a load, is such that a decrease in an input voltage or an input current of a power converting unit is detected, a change in the voltage of the capacitor is predicted, and operations of the power converting unit are caused to stop before the voltage of the capacitor drops to or below the maximum value of the voltage of the alternating current power supply, thereby restricting an occurrence of an inrush current.

Abstract: A battery including: a power supply bus; an assembly of electric cells and of first switches coupling the cells; second switches forming an H bridge and coupling said assembly to nodes; a first circuit for supplying first control signals to the first and second switches; a second circuit for delivering a first power supply voltage to the first circuit based on the voltage across one of the cells; a third circuit for supplying second control signals to at least two of the second switches and connected to the power supply bus; and first diodes coupling the first circuit to the two second switches and second diodes coupling the third circuit to the two second switches.

Abstract: A system including a control system is provided. The control system includes a main drive that receives power from a power source and outputs a variable frequency and a variable amplitude AC voltage. The control system also includes a controller to interface with the main drive and an electric machine. The controller receives one or more electrical signals associated with an operating condition of the electric machine from one or more sensors disposed between the electric machine and the main drive. The controller determines correction information based on the received electrical signals and based on a desired operating condition of the electric machine. The controller transmits the correction information to the main drive. The correction information corresponds to a rotor position of the electric machine or operating commands configured to implement the desired operating condition of the electric machine.

Abstract: A method for generating a current set point value for a charging device connected to an electrical network includes measuring at least one electrical voltage, calculating a filtered voltage according to the measured voltage and a value of electrical pulsation of the electrical network, estimating a frequency and the amplitude of the measured voltage according to the at least one measured voltage and the at least one filtered voltage, calculating a consolidated voltage according to the measured voltage and the filtered voltage, and generating a current set point value according to the consolidated voltage and the estimated amplitude.

Abstract: A method, apparatus, system and computer program is provided for controlling an electric power system, including implementation of a voltage control and conservation (VCC) system used to optimally control the independent voltage and capacitor banks using a linear optimization methodology to minimize the losses in the EEDCS and the EUS. An energy validation process system (EVP) is provided which is used to document the savings of the VCC and an EPP is used to optimize improvements to the EEDCS for continuously improving the energy losses in the EEDS. The EVP system measures the improvement in the EEDS a result of operating the VCC system in the “ON” state determining the level of energy conservation achieved by the VCC system. In addition the VCC system monitors pattern recognition events and compares them to the report-by-exception data to detect HVL events.

Abstract: Embodiments of the present application disclose a multi-level inverter clamping modulation method and apparatus, and an inverter. Switching elements of an inverter are controlled when an output voltage of the inverter crosses zero, and switching elements in each inverter bridge arm of an active clamp multi-level inverter include an internal tube, an external tube, and a clamping tube. The internal tube and the external tube are connected in series between a positive bus and a negative bus, the clamping tube is connected between a common terminal of the internal tube and the external tube and a bus, the internal tube is a low-frequency switching element, and the external tube and the clamping tube are high-frequency switching elements.

Abstract: A capacitor capacitance estimation device including processing circuitry to segment a section signal into a plurality of signals and to generate a plurality of pieces of frequency domain data by converting each of the plurality of signals obtained by the segmentation into a plurality of component values in a frequency domain. Each of the plurality of signals having a predetermined duration. The processing circuitry further configured to extract a component value of a frequency corresponding to a carrier frequency from the plurality of component values in each of the plurality of pieces of frequency domain data, to use the extracted component value as a value at time corresponding to the corresponding one of the extracted signals, and to generate time-series data representing a plurality of the extracted component values in a time series, to estimate a capacitance of a capacitor from processed and filtered time-series data.

Abstract: Provided is a semiconductor device including a semiconductor substrate doped with impurities, a front surface-side electrode provided on a front surface side of the semiconductor substrate, a back surface-side electrode provided on a back surface side of the semiconductor substrate, wherein the semiconductor substrate has a peak region arranged on the back surface side of the semiconductor substrate and having one or more peaks of impurity concentration, a high concentration region arranged closer to the front surface than the peak region and having a gentler impurity concentration than the one or more peaks, and a low concentration region arranged closer to the front surface than the high concentration region and having a lower impurity concentration than the high concentration region.

Abstract: A soft-switching solid-state power transformer, including: a high-frequency (HF) transformer comprising first and second winding connections; a first auxiliary resonant circuit coupled to the first winding connection, the first auxiliary resonant circuit comprising: a resonant capacitor coupled across the first winding connection, a resonant inductor coupled across the first winding connection in parallel with the resonant capacitor, and a damping feature coupled across the first winding connection in series with the resonant capacitor and the resonant inductor; a first current-source inverter (CSI) bridge coupled to the first auxiliary resonant circuit, the first CSI bridge comprising reverse blocking switches configured to conduct current in one direction and block voltage in both directions; a second auxiliary resonant circuit coupled to the second winding connection; and a second CSI bridge coupled to the second auxiliary resonant circuit, the second CSI bridge comprising reverse blocking switches.

Abstract: A converter circuitry between a first network, which may be either a poly-phase medium-voltage alternating current (AC) network, at least one polyphase low-voltage AC network or at least one direct-current (DC) network, and a second network, which may be either a polyphase medium-voltage AC network or a medium-voltage DC network, wherein the converter circuitry comprises at least one power bus and low-voltage power cells both at the first and at the second network side such that each power cell is connected to a power bus via a transformer. Each power bus is connected to a low-voltage power unit, which is able to supply pre-charging power via the power bus to all power cell intermediate DC-link filtering capacitors before the converter is started. The low-voltage power unit is also able to take care of a resistor braking in case the first network cannot take the power supplied by the load connected to the second network.

Abstract: A method and apparatus for operating a converter system of a wind turbine for exchanging electrical power with an electrical supply grid at a grid connection point are provided. In the method and apparatus, the converter system is operated in a normal operating mode. An overload situation affecting the converter system is detected and operation of the converter system is changed to an overload operating mode when the overload situation is detected. An average switching frequency for generating an output current is reduced in the overload operating mode of the converter system in comparison with the normal operating mode, a higher load is permitted on the converter system, which may be in the form of an increased temperature or an increased output current, in the overload operating mode of the converter system for a predetermined maximum overload period.

Abstract: An uninterruptible portable power bank, including: a portable power bank, the PWM charge and discharge control circuit is coupled to the AC to DC transformer circuit, the battery and the protection circuit module and the DC to AC transformer circuit, the automatic power switch is coupled to the first AC power transmission interface, the AC power output interface and the DC to the AC transformer circuit, the AC to DC transformer circuit is coupled to the first AC power transmission interface, the automatic power switch is connected to the first AC power transmission interface and the AC power output interface while connected with the wall power, and turn to connect to the DC to AC transformer circuit and AC power output interface while the wall power is cut off; and an AC power transmission cable having a second AC power transmission interface and a second wall power input interface.

Abstract: An objective of the present application is to provide an apparatus for conversion between AC power and DC power. The apparatus includes a first power conversion circuit having a first AC side and a first DC side, at least one second power conversion circuit each having a second AC side and a second DC side; and at least one choke having a first terminal, a second terminal and at least one third terminal, wherein the first terminal is arranged to be electrically coupled to a phase of the AC power, and the second terminal and the at least one third terminal are electrically coupled to respective same phases of the first AC side of the first power conversion circuit and the second AC side of the at least one second power conversion circuit.

Abstract: A zero-sequence current balancer for a controlling zero-sequence current in a three-phase power system includes a cascade multilevel modular inverter (CMMI) coupled to the three-phase power system, wherein the CMMI has a plurality of modules, each module having a module capacitor, and a real power injector circuit provided between the three-phase power system and the CMMI, wherein the real power injector circuit is structured and configured to cause real power to injected into and/or absorbed from the CMMI to regulate a voltage of one or more of the module capacitors.

Abstract: An electric power distribution system includes a first path through which electric power is supplied to a main load; a second path through which electric power is supplied to the backup load; a third path that connects a second DC/DC converter and a first battery; a fourth path that connects the first battery and the first DC/DC converter in parallel to the main load; and a control unit that controls an output voltage of the second DC/DC converter according to an assumed output capacity derived from travel route information of a navigation system mounted on the vehicle. The assumed output capacity is a capacity that is able to supply electric power used for a driven load in the backup load, and is set to be lower than a threshold battery capacity that is lower than in a fully charged state of the second battery.

Abstract: A system for distinguishing between actual power failure and false power failure in relation to a system under Efuse control includes a power unit, a detection unit, a control unit, a management substrate, and a management unit. The power unit outputs a voltage to the detection unit and the control unit. The detection unit detects state of a power supply from the power unit, and outputs a signal to the control unit. The management substrate monitors an operating state of the power unit, and outputs a status signal. The management unit obtains a system interrupt instruction from the control unit, and generates an error event or does not generate an error event according to the system interrupt instruction and a small period of time for establishing an actual or a false abnormality. A method for detecting an apparent or an actual power failure is also provided.

Abstract: An uninterruptible power supply (UPS) is provided including an interface to receive first sensor data indicative of operating information of a battery and second sensor data indicative of state-of-health characteristics of the battery from one or more sensors, and configured to communicate with a computer coupled to a plurality of UPSs, and a controller configured to receive the first sensor data, provide the first sensor data to the computer, receive an estimated battery health status (EBHS) of the battery based on the first sensor data and baseline battery health characteristics from the computer, receive the second sensor data from the one or more sensors, determine an actual battery health status (ABHS) of the battery based on the second sensor data, compare the EBHS and the ABHS, and communicate information to the computer to adjust the baseline battery health characteristics based on the comparison of the EBHS and the ABHS.

Abstract: A battery charger capable of receiving AC power and delivering both AC and DC power to an electric power storage battery in accordance to different embodiments disclosed herein using a rectifier circuit supplying the DC load and absorbing power as a five-level active rectifier with low harmonics on the AC input. In one aspect, the battery charger may have a bidirectional rectifier/inverter converter providing power conversion between a DC source and AC enabling the user to not only charge an electrical vehicle (“EV”) but also convert the energy charged in the EV/battery or solar panel to AC for use.

Abstract: A power factor correction circuit includes an input power source, a first bridge arm, a second bridge arm, an output capacitor and an active clamp unit. The first bridge arm includes a first switch and a second switch in series. The second bridge arm includes a third switch and a fourth switch in series. The active clamp unit includes a second inductor, a clamp capacitor and a fifth switch. The power factor correction circuit may realize the ZVS function of the first switch and the second switch by the collaboration of the active clamp unit and the conduction/non-conducting state of the first switch, the second switch, the third switch and the fourth switch.

Abstract: An alternating current power electronic converter includes an alternating current chopper circuit including two pairs of switches, each switch of a pair connected in series and the two pairs of switches connected in parallel. Each switch of a pair is a uni-directional switch. The uni-directional switches of each pair are arranged in opposing directions, and the uni-directional switches of one pair of switches are arranged in an opposing configuration to the uni-directional switches of the other pair of switches. The circuit comprises a bridge connection between switches of each pair of switches. A controller is configured to control a sequence of operation of the switches, providing an overlap period whenever one of the switches of a pair changes from open to closed and the other switch of the pair changes from closed to open. During the overlap period the switch that is moving from closed to open remains closed.

Abstract: An AC-DC conversion circuit can include an adaptive rectifier configured to receive an AC input voltage with different ranges, where operation states of the adaptive rectifier are adjusted according to a range of the AC input voltage, in order to decrease a fluctuation range of a DC output voltage of the adaptive rectifier.

Abstract: A multi-level circuit, a three-phase multi-level circuit, and a control method are provided. The multi-level circuit includes two groups of bus capacitors (C1 and C2) that are connected in series; a plurality of switching transistor branches that are connected in parallel to the capacitors, where each switching transistor branch includes a first half bridge (Q1 and Q2) and a second half bridge (Q3 and Q4), and a common terminal of the two half bridges is grounded (N); and two negative coupled inductors (L1 and L2), where each input terminal of each negative coupled inductor is connected to a common terminal (A1 and A2) of two switching transistors in the first half bridge in only one of the switching transistor branches. In this circuit, a quantity of groups of bus capacitors is decreased and circuit design complexity is reduced. Further, a dropout voltage of the switching transistors is reduced.

Abstract: The present application provides a power converter and a power supply system, the power converter includes: a star/delta switching unit, a first power conversion unit, a second power conversion unit, a third power conversion unit, and a controller; AC terminals of the first power conversion unit, the second power conversion unit and the third power conversion unit are connected to a three-phase AC terminal through the star/delta switching unit, and DC terminals of the first power conversion unit, the second power conversion unit, and the third power conversion unit are connected to a DC power terminal; wherein the controller is configured to control the star/delta switching unit according to a signal reflecting a voltage of the DC power terminal, to form a star connection or a delta connection among the three-phase AC terminal and the first power conversion unit, the second power conversion unit and the third power conversion unit.

Abstract: There is provided a power conversion device capable of effectively reducing a surge voltage generated by a parasitic inductance of a circuit. The power conversion device 1 is configured to operate a motor 8 driving a compression mechanism 7 of an electric compressor 16 by means of a three-phase inverter circuit 28 having a plurality of switching elements 18A to 18F. The power conversion device calculates a surge voltage value of each phase from a parasitic inductance of the circuit and phase currents iu, iv, and iw of the motor 8 to derive a phase in which the surge voltage value becomes maximum, and suppresses the switching of the switching elements 18A-18F of the phase having the maximum surge voltage value by a discontinuous modulation method.

Abstract: The present disclosure provides to a power converter including an AC input terminal (ACin), a neutral terminal (N), an AC output terminal (ACout), an AC/DC converter circuit (210) connected between the AC input terminal, a positive DC terminal (DCP), and a negative DC terminal (DCN), a DC capacitor (C15) connected between the positive DC terminal (DCP) and the negative DC terminal (DCN), a line frequency commutated neutral circuit (220) connected between the positive DC terminal (DCP), the negative DC terminal (DCN), and the neutral terminal (N), and a DC/AC converter circuit (230) connected between the positive DC terminal (DCP), the negative DC terminal (DCN), the AC output terminal (ACout), and the neutral terminal (N). The power converter further includes an auxiliary converter circuit (240) connected between the positive DC terminal (DCP), the negative DC terminal (DCN), and the neutral terminal (N).

Abstract: A power conversion system and controller configured to generate a real average DC current reference based on a DC bus voltage of a DC link circuit and a DC bus voltage setpoint, generate real and reactive ripple current references based on the DC bus voltage of the DC link circuit and a ripple angle of the DC link circuit, and generate rectifier switching control signals to operate rectifier switching devices based on the real average DC current reference and the real and reactive ripple current references.