Abstract: A system and method for combining power from DC power sources. Each power source is coupled to a converter. Each converter converts input power to output power by monitoring and maintaining the input power at a maximum power point. Substantially all input power is converted to the output power, and the controlling is performed by allowing output voltage of the converter to vary. The converters are coupled in series. An inverter is connected in parallel with the series connection of the converters and inverts a DC input to the inverter from the converters into an AC output. The inverter maintains the voltage at the inverter input at a desirable voltage by varying the amount of the series current drawn from the converters. The series current and the output power of the converters, determine the output voltage at each converter.

Abstract: A system and method for combining power from DC power sources. Each power source is coupled to a converter. Each converter converts input power to output power by monitoring and maintaining the input power at a maximum power point. Substantially all input power is converted to the output power, and the controlling is performed by allowing output voltage of the converter to vary. The converters are coupled in series. An inverter is connected in parallel with the series connection of the converters and inverts a DC input to the inverter from the converters into an AC output. The inverter maintains the voltage at the inverter input at a desirable voltage by varying the amount of the series current drawn from the converters. The series current and the output power of the converters, determine the output voltage at each converter.

Abstract: A method relating to control of a system including a single-phase three-level quasi-Z type source inverter connected to an LC filter which is in turn connected to a load, the inverter including first and second bridge arms, each including a plurality of switches, the method including the steps of (a) for each of a plurality of consecutive sampling periods (i) determining the duration of a shoot-through period for the next sampling period during which the inverter is in shoot-through mode; (ii) choosing a configuration of the switches for the next sampling period (iii) at the end of the sampling period setting the switches in the chosen configuration for the next sampling period; and (b) at a time during the next sampling period and for the duration of the shoot-through period setting the switches such that the inverter is in shoot-through mode.

Abstract: A method for operating a multi-level bridge power converter includes providing a plurality of switching devices of the power converter in one of a neutral point clamped topology or an active neutral point clamped topology. The method also includes providing a plurality of deadtimes for the switching devices. Further, the method includes selecting one of the deadtimes for each of the switching devices such that at least two of the switching devices operate according to different deadtimes. Moreover, the method includes operating the switching devices at the selected deadtimes to allow a first group of the switching devices to switch slower than a second group of the switching devices such that the first group of the switching devices satisfy safe operating requirements while the second group of the switching devices switch faster than the first group.

Abstract: An uninterruptible power supply (UPS) is provided that includes a split direct current (DC) link having a first capacitor coupled between a positive DC link terminal and a first node, and a second capacitor coupled between the first node and a negative DC link terminal. The UPS also includes a rectifier coupled to an input of the split DC link and a controller coupled to the rectifier. The rectifier includes first, second, and third legs, wherein each leg is configured to convert a first alternating current (AC) voltage received from an AC source into a DC voltage to be provided to the split DC link, and a fourth leg configured to balance DC link voltages of the first and second capacitors. The controller is configured to maintain functionality of the rectifier during at least one of a partial utility power outage, a full utility outage, and a failure of at least one of the first, second, third, and fourth legs.

Abstract: A circuit comprising a first power node for connection to a positive voltage of a DC link, a second power node for connection to a negative voltage of the DC link and a mid-point power node for connection to a mid-point voltage of the DC-link, the circuit further comprising a three-level neutral point clamped converter module and a brake resistor connection.

Abstract: Various embodiments according to the present invention relate to a power conversion device and method, the device comprising: a converter; a capacitor unit including a plurality of capacitors for storing input voltage input thereto; a switch unit connected to the capacitor unit and including a plurality of switches for selectively connecting at least one capacitor among the plurality of capacitors to the converter; and a controller connected to the capacitor unit and the switch unit, wherein the controller determines at least one capacitor satisfying a specified condition, among the plurality of capacitors, sets at least one switch among the plurality of switches to be turned on, the at least one switch corresponding to the at least one capacitor, and sets at least another switch among the plurality of switches except for the at least one switch, to be turned off, so that the at least one capacitor and the converter are electrically connected and configured to allow at least partial voltage of the input volta

Abstract: An inductive driver circuit with improved speed of clamping down a powered solenoid element, which solenoid exhibits inductive properties, for purposes of rapid shut down of the solenoid.

Abstract: An electronic device includes a first voltage conversion unit that divides an input voltage and outputs the divided voltage, a detection unit that detects the input voltage, and a control unit that controls the voltage division ratio of the first voltage conversion unit such that the output voltage of the first voltage conversion unit decreases as the input voltage increases.

Abstract: A method manages a fault on a DC voltage side of a converter assembly including a modular multistage converter with switching modules having semiconductor switches and an energy store. Some switching modules are a first type and others are a second type. During operation, a positive switching module voltage, negative switching module voltage or zero voltage are generated at terminals of switching modules of the first type, and a positive switching module voltage or zero voltage are generated at terminals of switching modules of the second type. Upon detecting a DC voltage side fault, switching modules of the first type are actuated such that the polarity of their energy store voltages corresponds to the polarity of a fault current, and energy stores of switching modules of the first type are charged to a voltage exceeding their rated voltage. A converter assembly carrying out the method is also provided.

Abstract: The power supply device includes a first winding, a second winding, a third winding, a fourth winding, a first AC-DC conversion unit, a second AC-DC conversion unit, a first power supply terminal and a second power supply terminal. The first and second windings are disposed on a secondary side of a multi-pulse transformer, and coupled to an input of the first AC-DC conversion unit. The first power supply terminal is coupled to an output of the first AC-DC conversion unit. The third and fourth windings are disposed on the secondary side of the multi-pulse transformer, and coupled to an input of the second AC-DC conversion unit. The second power supply terminal is coupled to an output of the second AC-DC conversion unit. Phases of output voltages of the first winding, the third winding, the second winding and the fourth winding are successively shifted left or successively shifted right for 15°.

Abstract: Systems and methods presented herein provide for multivariable model predictive control of a multistep plant. In one embodiment, a model predictive controller (MPC) includes a model of the multistep plant. The MPC is operable to linearize at least two steps of the multistep plant into cycle steps based on the model, to process an output signal from the multistep plant, and to independently control the cycle steps based on the output signal to optimize an output of the multistep plant.

Abstract: A control system for a multiphase electric motor comprises processing means arranged to determine a pattern of PWM voltage waveforms to be applied to respective phases of the motor, the processing means assigning different PWM patterns for use with different motor positions. In use for a given rotational position of the motor the processing means is normally adapted to apply PWM waveforms according to the assigned PWM pattern unless a different PWM pattern is currently in use at that time, except that in the event that the demanded voltage waveforms cannot be achieved with the current PWM pattern the processing means is adapted to force the PWM pattern to change. Upon the rotor moving into a different position associated with a different assigned pattern the processing means forces the PWM pattern to change to the assigned PWM pattern.

Abstract: Disclosed is a rectifying device provided with a standby power reduction function. When a voltage of unsmoothed DC power, which is output from a rectifying unit that rectifies AC power, is lowered to be equal to or smaller than a discharge reference voltage at a time around a zero-crossing point of the AC power, the present invention can instantaneously discharge a capacitor, which has been charged with the unsmoothed DC power, to be synthesized with the unsmoothed DC power, and thus supply stable DC power to a load without using an electrolytic capacitor. In particular, the present invention can adjust a resistance value of a surge prevention switch connected in series with the capacitor to control a current amount flowing through the capacitor, and thus can prevent a surge voltage from being generated when charging and discharging the capacitor.

Abstract: A power conversion device may include a first inverter to which one end of each phase winding of a motor is coupled, a second inverter to which the other end of each phase winding is coupled, and a switch circuit having at least one of a first switch element that switches between connection and disconnection of the first inverter to and from a ground, a first protection circuit being coupled in parallel to the first switch element, and a second switch element that switches between connection and disconnection of the second inverter to and from the ground, a second protection circuit being coupled in parallel to the second switch element.

Abstract: A power supply device includes a storage battery, a capacitor unit connected to the storage battery, a power converter including three phases connected to the storage battery in parallel, a control device configured to control a switching on and off of switching elements included in the three phases respectively, a first connection terminal connected to a P terminal of a DC charger and located between first and second switching elements in any one of the three phases, and a second connection terminal connected to an N terminal of the DC charger and located between third and fourth switching elements in another one of the three phases.

Abstract: A power conversion device includes a case, a power module, a smoothing capacitor and a high-voltage connection portion. The power module is housed in the case. The smoothing capacitor is fixed to the case by capacitor fixing bolt, and suppresses voltage fluctuations. In the high-voltage connection portion, the power module and the smoothing capacitor are electrically connected. The locations at which the smoothing capacitor is fixed to the case by the capacitor fixing bolts correspond to the capacitor fixing points. The capacitor fixing points are arranged at positions that avoid corner portions of the smoothing capacitor. The power module and the smoothing capacitor are disposed adjacent to each other at the high-voltage connection portion.

Abstract: A method for controlling shutdown wave blocking of a multilevel inverter circuit and an application apparatus for applying the method are provided. After a shutdown command is issued, the multilevel inverter circuit is controlled to switch between a free state and a specific turn-on state. The free state is a state in which all switch tubes in the multilevel inverter circuit are turned off. The specific turn-on state is a state in which voltage stress withstood by a switch tube, on which clamping protection is not performed, in the multilevel inverter circuit is zero by controlling a specific combination of switch tubes in the multilevel inverter circuit to be turned on.

Abstract: An electric traction machine, a motor vehicle, and a method for controlling dissipated heat in the electrical power plant of the motor vehicle are described herein. The power plant is supplied with a current, where, in order to provide a predetermined amount of dissipated heat, a ratio between a field-forming and a torque-forming current deviating from an optimum ratio for a respective operating point of the power plant is prescribed. The predetermined dissipated heat is provided by a power plant embodied as a magnet-less three-phase alternator while a rotor current flowing through a rotor of the three-phase alternator is adjusted, the field-forming and the torque-forming currents being prescribed such that acoustic interference signals of the three-phase alternator are minimized by the ratio, and the rotor current is adjusted such that the predetermined dissipated heat is provided by a combination of the rotor current and the ratio minimizing the interference signals.

Abstract: The present invention relates to an actuator in a landing gear system of an aircraft, comprising: an electric drive for driving the actuator and first drive electronics for controlling the electric drive that are connected to the drive via an electric line, with second drive electronics for controlling the electric drive that are connected to the drive via an electric line, with the first drive electronics and the second drive electronics being redundant with respect to one another.

Abstract: A switching circuit includes a diode, a semiconductor switch, and a first bidirectional switch. The semiconductor switch is configured to conduct a first current from a second terminal to a third terminal of the semiconductor switch when a first on-state signal is sent to a first terminal of the semiconductor switch. An anode of the diode is connected to the second terminal of the semiconductor switch, and a cathode of the diode is connected to the third terminal of the semiconductor switch. The first bidirectional switch includes a first terminal, a second terminal connected to the anode of the diode, and a third terminal and is configured to conduct a second current from the second terminal to the third terminal or from the third terminal to the second terminal when a second on-state signal is sent to the first terminal of the first bidirectional switch.

Abstract: Electronic circuitry for independently adjusting color temperature and brightness of an LED light fixture is disclosed utilizing two wires. According to one embodiment, a color-tunable and dimmable LED light fixture has first and second LED light strings connected in an anti-parallel arrangement.

Abstract: The system determines that a multiphase electric motor is in a low-speed operating range, near stall. The system determines a duty cycle for each phase of the multiphase electric motor. The duty cycle includes a nominal component and a zero-sequence component configured to balance temperature rises of power electronics devices of the motor drive. Power electronics devices can include diodes, IGBTs, or other switches or devices. The system causes each duty cycle to be applied to a corresponding switch of the corresponding phase of the multiphase electric motor to cause current flow in the corresponding phase. The system may determine duty cycles corresponding to a thermal balance between a switch and a diode of a phase and a thermal balance between a pair of like devices of different phases, and then determine which duty cycle is closer to a predetermined value.

Abstract: An emergency lighting security system has a system control panel, a plurality of predetermined light fixtures, each light fixture in communication with a smart switch in data communication with the system control panel. A building distribution panel for distributing power to the light fixtures; Wi-Fi repeaters for boosting signal strength within an installation, and a key-fob operable by a homeowner to initiate an emergency signal to the control panel to set the smart switches into a strobe or flash mode controlling the light fixtures. Also a method of controlling an emergency lighting security system via a wireless control panel with Wi-Fi switches to set predetermined exterior and interior light fixtures into a strobe or flashing mode.

Abstract: A controlling method is for a single-phase bidirectional inverter. The single-phase bidirectional inverter includes a switch and an inductor. The controlling method for the single-phase bidirectional inverter includes an extracting step, a calculating step, and an integrating step. In the extracting step, a current command is inputted to the switch and obtaining a current through the inductor. The current is piecewisely linearized to extract a magnetizing inductance and a demagnetizing inductance of the inductor. In the calculating step, a duty ratio of the switch is used to calculate a variation of the current of the magnetizing inductance and a variation of the current of the demagnetizing inductance. In the integrating step, the variation of the current of the magnetizing inductance and the variation of the current of the demagnetizing inductance are integrated to obtain another duty ratio of the switch in the next cycle.

Abstract: Certain embodiments involve a modular medium voltage fast charger. The modular medium voltage fast charger can include: (1) a predictive power factor correction (“PFC”) controller (or predictive controller) for series-interleaved multi-cell three-level boost (“SIMCB”) converters, (2) an active neutral point clamped (“NPC”) dual active bridge (“DAB”) modulation scheme to achieve soft switching, (3) an auxiliary capacitor to reduce NPC DAB turn-off voltages, (4) a comprehensive and scalable protection circuit, and (5) a high-isolation pulse transformer with a bobbin for reducing coupling capacitance of the pulse transformer.

Abstract: Systems, methods, techniques and apparatuses of power switches are disclosed. One exemplary embodiment is a power switch comprising an outer housing; a power electronics board disposed within the housing and including a semiconductor switch structured to selectively conduct a current between a first power terminal and a second power terminal; a first heat sink coupled to the power electronics board; a plurality of thermally conductive connectors; a second heat sink coupled to the plurality of thermally conductive connectors, a control electronics board structured to control the semiconductor switch, the control electronics board being located within an enclosure formed of the second heat sink, the plurality of thermally conductive connectors, and the power electronics board.

Abstract: A power converter apparatus is provided with: a plurality of leg circuits, each including two switch circuits connected in series between input terminals; a transformer including a primary winding and a secondary winding, the primary winding having a first terminal and a second terminal; and at least one capacitor. The at least one capacitor is connected between the first terminal or the second terminal of the primary winding of the transformer, and a node between the two switch circuits in at least one leg circuit among the plurality of leg circuits. The first terminal of the primary winding of the transformer is connected to at least two nodes between the switch circuits in at least two first leg circuits among the plurality of leg circuits, via at least two first circuit portions having at least one of capacitances and inductances different from each other, respectively.

Abstract: A low frequency direct drive amplifier is disclosed which can simultaneously achieve high drive voltages, high power density, high efficiency, and wide bandwidth operation is disclosed. The power circuit structure includes an input DC-DC converter and an output multi-level DC-AC inverter. The input DC-DC converter's circuit topology is commonly referred to as the phase shifted full bridge, which includes input capacitors, a Gallium Nitride (GaN) based full bridge, an isolation transformer, two rectifying diodes, and two series stacked output capacitors. The output DC-AC inverter includes two series stacked input capacitors (same as the input DC-DC converter's output capacitors), four Silicon Carbide (SiC) semiconductors, four Silicon IGBTs, and an output filter. The disclosure's features the combination of the output multi-level DC-AC inverter circuit topology paired with 1.7 kV SiC semiconductors, allowing for a high voltage direct drive design without a low frequency boost transformer.

Abstract: The present disclosure relates to a power converter device including a power factor correction circuit, a resonance converter circuit, and a zero voltage switching circuit. The power factor correction circuit is coupled to the primary side rectifier circuit, and includes a first switching circuit, a first control circuit and a first output circuit. The resonance converter circuit includes a second switching circuit and a second control circuit. The second switching circuit is coupled to the first output circuit, and the second control circuit is coupled to the secondary side rectifier circuit. The zero voltage switching circuit is coupled between the first control circuit and the second control circuit. The zero voltage switching circuit is configured to obtain a switching voltage of a switch element in the second switching circuit, and output an adjustment signal to the first control circuit according to the switching voltage.

Abstract: A power conversion apparatus includes: an inverter unit; a first capacitor group, an positive electrode of the first capacitor group connected to an positive electrode on the DC input side of the inverter unit; a second capacitor group, a negative electrode of the second capacitor group connected to a negative electrode of the DC input side of the inverter unit; a first terminal portion connected to the positive electrode of the first capacitor group; a second terminal portion connected to a negative electrode of the first capacitor group; a third terminal portion connected to an positive electrode of the second capacitor group; and a fourth terminal portion connected to the negative electrode of the second capacitor group, wherein a distance between the first terminal portion and the third terminal portion is approximately equal to a distance between the second terminal portion and the fourth terminal portion.

Abstract: A PWM controlled multi-phase resonant voltage converter may include a plurality of primary windings powered through respective half-bridges, and as many secondary windings connected to an output terminal of the converter and magnetically coupled to the respective primary windings. The primary or secondary windings may be connected such that a real or virtual neutral point is floating.

Abstract: A circuit comprising a first power node for connection to a positive voltage of a DC link, a second power node for connection to a negative voltage of the DC link and a mid-point power node for connection to a mid-point voltage of the DC-link, the circuit further comprising a three-level neutral point clamped converter module and a brake resistor connection.

Abstract: A multiphase inverter apparatus includes an insulating substrate, a plurality of half bridge circuits and a phase output lead for each half bridge circuit. The substrate includes a conductive redistribution structure on a first surface and having at least one low voltage bus and at least one high voltage bus. Each half-bridge circuit is electrically coupled between a low voltage bus and a high voltage bus and includes: a packaged low side switch; a packaged high side switch; and a phase output electrically coupled with the respective phase output lead. The packaged low side and high side switches are arranged on the first surface of the substrate. The phase output lead is arranged on and electrically coupled to the packaged low side and high side switches such that the low side and high side switches are arranged vertically between the phase output lead and the first surface of the substrate.

Abstract: A switch module assembly including a switch module including a bus bar system having a positive bus bar and a negative bus bar, and at least one snubber capacitor fastened to the switch module, each of the at least one snubber capacitor having a body part, a positive terminal connected to the positive bus bar, and a negative terminal connected to the negative bus bar. The switch module assembly includes a capacitor support member adapted to reduce vibration of the body part of the at least one snubber capacitor relative to the switch module, the capacitor support member is made of flexible material, and is in contact with the body part of the at least one snubber capacitor and the switch module.

Abstract: A power supply according to the present disclosure includes: a step-down circuit which has at least one pair of positive/negative step-down switching elements; at least one pair of positive/negative inductors to which voltage is applied via the step-down switching element, and one pair of positive/negative output capacitors which are connected in series and charged by electrical current passing through the inductor, and steps down input voltage and then outputs; an inverse-conversion circuit which has a plurality of inverse-conversion switching elements, and inverse-converts output voltage of the step-down circuit into alternating current; and a control circuit which controls switching of the plurality of step-down switching elements so that the output voltage of the step-down circuit becomes a desired voltage.

Abstract: The present invention discloses a modular multilevel dynamic switching DC-DC transformer, which consists of N DC-DC sub-modules connected in series. Each of the DC-DC sub-modules is of a symmetrical structure capable of realizing bidirectional power flow, which consists of two half-bridge sub-modules and isolating switches S1, S2 between capacitors C1, C2 of the two half-bridge sub-modules. The capacitors C1, C2 are disposed in parallel between the half-bridge sub-modules and the isolating switches. Assuming that the power flows in the primary side of the DC-DC transformer and flows out from the secondary side; the half-bridge sub-module located on the primary side of the DC-DC transformer is referred to as a primary-side sub-module; and, the half-bridge sub-module located on the secondary side of the DC-DC transformer is referred to as a secondary-side sub-modules.

Abstract: A device includes a driver circuit to send data bits onto a data bus that is partitioned into a DC component and an AC component. The driver circuit is to, for some data bits, retrieve a value of a DC power ratio of the data bus. The driver circuit is further to determine, using the value of the DC power ratio, a first value for a first portion of total power to be dissipated over the DC component to transmit the data bits, and determine, using one minus the value of the DC power ratio, a second value for a second portion of total power to be dissipated over the AC component to transmit the data bits. The driver circuit is to determine whether to send the data bits onto the data bus using data bus inversion dependent on a combination of the first value and the second value.

Abstract: The present disclosure discloses a hybrid five-level bidirectional DC/DC converter and a voltage match modulation method thereof. The converter includes a first input filter capacitor Cinp and a second input filter capacitor Cinn, an output filter capacitor Co, a DC voltage source, a primary-side hybrid five-level unit, a primary-side two-level half bridge, a secondary-side single-phase full bridge H2, a high-frequency isolation transformer M1, a high-frequency inductor Ls, and a controller. A positive pole of a DC bus of the primary-side hybrid five-level unit is coupled to a positive pole of the corresponding DC voltage source and to a positive pole of the input filter capacitor Cinp respectively. A negative pole of the DC bus of the primary-side hybrid five-level unit is coupled to a negative pole of the corresponding DC voltage source and to a negative pole of the input filter capacitor Cinn respectively.

Abstract: A power conversion device achieves size reduction and reliability by reducing the number of components of the system. The power conversion device has a semiconductor module of a half-bridge configuration in which two semiconductor elements are arranged in series. The semiconductor module has a cuboidal shape and has, along a longitudinal direction thereof, a positive pole terminal, a negative pole terminal, and terminals for inputting or outputting alternating current or for forming a single phase of the power conversion device. In the vertical direction corresponding to a widthwise direction of the cuboid, a plurality of the semiconductor modules are arranged vertically, forming a plurality of phases of the power conversion device. The semiconductor modules of the plurality of phases are installed in contact with a cooling unit, and one or more capacitors are disposed so as to face the cooling unit across the semiconductor modules of the plurality of phases.

Abstract: A control unit repeats the series of processing of comparing a first phase representing a phase of the first reference sine wave and being a phase included in the first synchronization signal, with a second phase that is the phase of the second reference sine wave when the first synchronization signal is received when the communication unit receives the first synchronization signal from the other inverter generator, changing a phase change amount per unit time of the second reference sine wave in accordance with the comparison result, continuing to update the phase of the second reference sine wave so that the phase of the second reference sine wave changes with a phase change amount per unit time after the change with reference to the first phase until the next first synchronizing signal is received from the other inverter generator.

Abstract: A dual active bridge system can include a plurality of dual active bridges (DABs). Each DAB can have a first side connected in parallel and a second side connected in parallel such that each of the plurality of DABs share a common first side capacitor and a common second side capacitor. The plurality of DABs can be configured to be operated to reduce or eliminate ripple current at the first side capacitor and/or second side capacitor.

Abstract: A new class of DC-AC inverter consists of a buck or two buck converters and two or four low frequency switches, and it achieves ultra-high efficiency, reactive power flow capability, small size and low cost in grid-connected applications.

Abstract: The instant disclosure concerns a power converter including: a primary stage (110) including at least one first cut-off switch (S11, S12, S13, S14); a control circuit (112) capable of applying a first control signal to said at least ore first switch; a secondary stage (130) including at least one second cut-off switch (S21, S22, S23, S24); a control circuit (132) capable of applying a second control signal to said at least one second switch; a power transmission stage (120) coupling the primary stage (110) to the secondary stage (130), wherein the control circuit (132) of the secondary stage is electrically isolated from the control circuit (112) of the primary stage.

Abstract: A control circuit for an induction heating device includes a D.C. power supply, referenced to a ground connection and configured to supply power to the induction heating device. A switching device is configured to be selectively activated to control the induction heating device. The switching device is connected on one end to the ground connection. A resonant load is disposed between the D.C. power supply and the switching device, the resonant load including a capacitor and an inductor connected in a parallel configuration. At least one rectifying device is disposed in series with the resonant load and the switching device. The switching device is configured to control current from the D.C. power supply through the resonant load.

Abstract: A motor drive apparatus includes: a DC-side capacitor charged with direct current power; an inverter unit comprising multiple top switches and bottom switches, performing a switching operation so as to convert power stored in the DC-side capacitor into alternating current power, and outputting the converted alternating current power to a motor; a shunt resistor for detecting a current flowing through the DC-side capacitor; and a controller for controlling the inverter unit to perform dynamic braking for stopping the motor. Before the dynamic braking is performed, the controller controls the inverter unit to gradually increase a phase current flowing through the bottom switches.

Abstract: A drive circuit for a switch capacitor converter having first, second, third, and fourth power switches connected in series, can include: first, second, third, and fourth drivers configured to respectively drive the first, second, third power, and fourth power switches according to control signals; a bootstrap power supply circuit comprising a bootstrap capacitor configured to supply power to the first, second, and third drivers in a time-sharing manner; and a power supply configured to supply power to the fourth driver and charge the bootstrap capacitor, where the fourth power switch is grounded.

Abstract: An inverter circuit for realizing high-efficiency control of single-phase power of a single-phase three-wire power supply includes a bridge inverter circuit connected to an output end of a DC power supply, a freewheeling circuit connected to an output end of the bridge inverter circuit for providing freewheeling during switching of the bridge inverter circuit, and a control unit connected with the bridge inverter circuit and the freewheeling circuit. When the switching units in the high-frequency operating state are switched to an off state, the freewheeling circuit is controlled to operate continuously to output power to the U-phase line or the W-phase line, so that the switching units only participate in high-frequency operations in nearly half of the whole mains cycle, thereby switching loss and conduction loss of the switching units Q1 to Q6 can be reduced by nearly half, and the efficiency of the whole inverter circuit is greatly improved.

Abstract: A three-dimensional (3-D) inductor is incorporated in a substrate. The 3-D inductor has a first connector plate, a second connector plate, a third connector plate, a first terminal plate, and a second terminal plate. Four multi-via walls connect the various plates, wherein each multi-via wall includes a first group of at least three individual via columns, each of which connects two plates together.

Abstract: A power module for a converter of electrical magnitudes having an electronic board on which a first electrical circuit is fashioned which defines a positive pole of a direct magnitude, a second electrical circuit is fashioned which defines a negative pole of a direct magnitude, and a third electrical circuit is fashioned which conducts an alternating magnitude. There is one or more first and second electronic switching devices arranged between the first and second electrical circuit, and the third electrical circuit so as to realize the conversion. The first and second electrical circuit are, at least for respective coupling portions, arranged in proximity to the electronic switching devices, neared and superposed at a same face of the board so that a capacitive and/or inductive coupling between the two circuits is realized.