Abstract: A method of monitoring the condition of a circuit comprises establishing a known baseline signal for a type of circuit (each is somewhat different) and defining these characteristics in terms of the lead and trailing edge angular components (@ zero crossing point), the voltage (amplitude), and the period (time length) of the waveform. Ideally, the angular component of the square wave should be vertical, or at 90 degrees to x-axis. The baseline non-regular square wave that is composed of current, voltage, any harmonic thereof, or the combination of these signals which best indicate predictive measurement attributed to the type of circuit being monitored. Future wave forms indicate the rate of decay based upon the aggregated angular, amplitude, and period components of the zero-crossing points when compared to the baseline signal and/or prior waveform of the observed specific splice. The rate of decay can help determine the life expectancy of the circuit.

Abstract: A universal power converter of the present application may include a link stage between an input stage and an output stage that operates at a higher frequency than the frequency of the input power source. As a result, a more compact capacitor may be used, thus reducing the size of the power converter. In some embodiments, the link stage may be a partially resonant link that permits zero current switching (ZCS). ZCS operation may reduce switching losses during operation. Universal power converters of the present application utilizing ZCS may be implemented using naturally commutated switches, such as silicon controlled rectifiers (SCRs), instead of transistor switches. Such power converters utilizing SCRs may be more reliable than power converters utilizing transistor switches. Additionally, control circuitry required to operate such power converters may be simplified. Accordingly, a more compact, efficient, and reliable universal power converter may be achieved.

Abstract: This discloses apparatus including, but not limited to, an all Direct Current (DC) energy transfer circuit, a energy transfer controller, an all-DC energy transfer network, components of use in such circuits, and application apparatus that benefits from including and/or using the all-DC energy transfer device and methods of operating the above in accord with this invention. The application apparatus may include, but are not limited to, a hybrid electric vehicle, an electric vehicle, and/or a solar power device, in particular, a hybrid electric/internal combustion engine automobile.

Abstract: The invention relates to a method for operating an inverter (1) and to an inverter (1) for converting a direct voltage (UDC) into an alternating voltage (UAC) with a specified grid frequency (fAC) for supplying loads (12) and/or feeding into a supply grid (13), comprising a direct voltage input (2) and multiple AC power units (6) which are connected in parallel and comprise semiconductor switches (7) in a bridge circuit and freewheeling diodes (8) arranged parallel thereto. The outputs of the AC power units (6) are connected to an alternating voltage output (10) via a respective inductivity (9).

Abstract: A power conversion apparatus includes positive-side and negative-side switching elements, positive-side and negative-side gate drive circuits, a capacitor and a gate signal controller. The positive-side switching element is disposed between a positive-side direct-current bus and an output node. The negative-side switching element is disposed between a negative-side direct-current bus and the output node. The gate drive circuits turn on and off the respective switching elements. The capacitor is inserted between the buses. The gate signal controller transmits, to the gate drive circuits, gate signals to instruct turning on or off the switching elements. In response to a start instruction of pre-charge of the capacitor, the gate signal controller transmits a first gate signal to temporarily turn on and then off the positive-side gate drive circuit and transmits a second gate signal to temporarily turn on and then turn off the negative-side gate drive circuit.

Abstract: A power inverter includes primary switches, a transformer, a rectifier, a high voltage (HV) bus, an H-bridge, a detector, and a feedback controller. The transformer receives a switched direct current (DC) signal from a battery. The H-bridge outputs an AC signal to a stepped load. The detector detects a step-up load change by monitoring the stepped load. The feedback controller regulates a duty cycle of the AC signal, thereby reducing total harmonic distortion (THD) affecting the power inverter and the stepped load. The feedback controller further regulates the duty cycle of the AC signal by temporarily setting the primary switching duty cycle at a maximum allowable level in response to the step-up load change.

Abstract: A method and apparatus for power conversion comprising a three-port converter comprising a DC port for coupling to an external DC line, an AC port for coupling to an external AC line, and a storage port, internal to the three-port converter, for storing excess energy and discharging needed energy during power conversion, wherein the storage port is located on a DC-side of the three-port converter and is decoupled from the DC port such that a voltage on the storage port can be controlled independently of a DC voltage on the DC port.

Abstract: A DC-DC converter that provides both buck and boost voltages using a single inductor is disclosed. The DC-DC converter includes an H-bridge circuit having an inductor having first and second terminals, and a number of switches. The switches include a first switch coupled between the second inductor terminal and a boost voltage node, a second switch coupled between the second inductor terminal and a buck voltage node, and a third switch coupled between the first inductor terminal and an input voltage node. A control circuit is coupled to activate the switches in accordance with a number of different phases such that a buck voltage (e.g., less than the input voltage) is provided on the buck voltage node, while a boost voltage (e.g., greater than the input voltage) is provided on the boost voltage node.

Abstract: A power supply ECU is configured to: adjust magnitude of transmission power by adjusting a duty of an output voltage of an inverter; and adjust a frequency of the transmission power by controlling the inverter. The power supply ECU is configured to execute first control and second control. In the first control, the frequency is adjusted such that a loss of the inverter decreases while maintaining the transmission power, when a temperature of the inverter exceeds a limit temperature. In the second control, the transmission power is reduced, when the temperature of the inverter exceeds the limit temperature even if the first control is executed.

Abstract: Technologies for interactive predictive control of uninterruptible power supply systems are disclosed. In an illustrative embodiment, a method of controlling a double-conversion uninterruptible power supply (UPS) system may include defining, with a digital signal processor (DSP), a curve as a function of a plurality of user-input reference points associated with an inductor coupled to either an input or an output of the double-conversion UPS system, where the curve is indicative of an electromagnetic behavior of the inductor. The method may also include determining, with the DSP, in response to an application of current to the inductor, an inductance value for the inductor based on the defined curve and the applied current. The method may further include setting, with the DSP, as a function of the determined inductance value, a duty cycle to control switching of at least one of an active rectifier and an inverter of the double-conversion UPS system.

Abstract: Embodiments described herein include a solid-state switch tube replacement for the radar system such as, for example, the SPY-1 radar system. Some embodiments provide for a technology for the precision switching that enables IGBT power modules to operate robustly in a series configuration and/or a parallel configuration to produce precision switching at high voltage (e.g., 20 kV and above) and high frequencies (e.g., 1 MHz and above).

Abstract: A vehicle includes an inverter having first and second half bridges configured to provide multiphase voltage to an electric machine. The vehicle further includes a controller configured to activate a switch of the first half bridge and pulse width modulate a switch of the second half bridge to conduct resonant output on a rail of the inverter to the electric machine such that the multiphase voltage is created for at least a sixth of a cycle of the electric machine. The activation is responsive to a torque command.

Abstract: A cascaded bootstrapping gate driver configured to provide quick turn-on of a high side power FET and low static current consumption. The cascaded bootstrapping gate driver includes an initial bootstrapping stage with a resistor to decrease static current consumption during transistor turn-off. A secondary bootstrapping stage is driven by the initial bootstrapping stage and includes a GaN FET transistor with a low on resistance in place of the resistor. The source terminal of the GaN FET transistor provides a gate driving voltage to the high side power switch FET. The low on-resistance of the GaN FET transistor provides quick turn-on of the high side power FET. Transistors in the cascaded bootstrapping gate driver are preferably enhancement mode GaN FETs and may be integrated into a single semiconductor die.

Abstract: A three-phase inverter includes three series circuits that are connected in parallel to a capacitor connected in parallel to a DC voltage source. Each of the three series circuits includes two semiconductor switching elements connected in series. A connection point between the two semiconductor switching elements is used as an AC output terminal for each phase. The three-phase inverter generates PWM pulses of three phases including a PWM pulse of one phase, whose pulse width of a positive side pulse in one switching cycle is the largest, and including PWM pulses of the other two phases such that a positional relationship between positive side pulses of the other two phases is a positional relationship in which an overlapping range on a time axis is smaller as compared with a state in which a positive side pulse of one phase encompasses a positive side pulse of the other pulse.

Abstract: A 3-level T-type neutral point clamped (NPC) inverter/rectifier is disclosed in which neutral point clamping is dynamically enabled/disabled responsive to load, e.g. enabled at low load for operation in a first mode as a 3-level inverter/rectifier and disabled at high/peak load for operation in a second mode as a 2-level inverter/rectifier. When the neutral clamping leg is enabled only under low load and low current, middle switches S2 and S3 can be smaller, lower cost devices with a lower current rating. Si, SiC, GaN and hybrid implementations provide options to optimize efficiency for specific load ratios and applications. For reduced switching losses and enhanced performance of inverters based on Si-IGBT power switches, a hybrid implementation of the dual-mode T-type NPC inverter is proposed, wherein switches S1 and S4 comprise Si-IGBTs and switches S2 and S3 of the neutral clamping leg comprise GaN HEMTs. Applications include electric vehicle traction inverters.

Abstract: A module for interconnecting a pair of DC sources or a pair of DC loads into a DC bus includes: a first port for each source or load; a switching cell for each first port, each cell having a pair of terminals and a switching node; a second port operatively connected to the DC bus and having a pair of terminals, one of the pair of terminals of the second port being connected to one of the terminals of one of the cells and the other of the pair of terminals of the second port being connected to one of the terminals of the other of the cells; and a filter inductor connected between the switching nodes of the cells. Systems including the module and methods utilizing the system are also disclosed.

Abstract: A vehicle includes a traction battery comprising a plurality of cells. The vehicle also includes a plurality of power converters each electrically coupled between a corresponding group of cells and an electrical bus. A controller is programmed to allocate current demand to the power converters and operate the power converters to minimize energy consumption and losses.

Abstract: A power transfer system includes power conversion circuitry that has first circuitry and second circuitry on either side of a transformer that include a transformer having a power supply, a switch, a capacitor connected in parallel with a winding of the transformer, and an inductor connected between the power supply and the capacitor. The inductor provides an additional resonance current path through the power conversion circuitry that is configured to reduce a peak voltage at the switch. A direction of power transfer through the power conversion circuit is determined, and the first circuitry and the second circuitry are configured based on the determined direction of power transfer. The switches of the first circuitry and second circuitry are controlled using switching based on the determined direction of power transfer and a quantity of power transfer.

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: Rectifier circuit. At least some of the example embodiments are circuits including: an anode terminal; a cathode terminal; a field effect transistor (FET) defining a drain, source, and gate, the source coupled to the anode terminal, and the drain coupled to the cathode terminal; a diode having anode and cathode, the anode coupled to the cathode terminal; a bootstrap capacitor coupled between the cathode of the diode and the anode terminal; a FET controller coupled to the gate of the FET and a node between the diode and bootstrap capacitor; the FET controller configured to make the FET conductive as the circuit becomes forward biased, and the FET controller configured to make the FET non-conductive during periods of time when the circuit is reverse biased.

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: A device for protecting an inverter include a first power switch configured to be turned on when a first voltage signal from a first switch of a safety relay is applied thereto; a second power switch connected in series with the first power switch, wherein the second power switch is configured to be turned on when a second voltage signal from a second switch of a safety relay is applied thereto; and a power line for connecting the first power switch and the second power switch to each other in series and for connecting the series of the first power switch and the second power switch to a buffer of the inverter, wherein a third voltage signal is applied via the power line to the buffer.

Abstract: Disclosed are a new phase shift full bridge (PSFB) converter using a clamp circuit connected to a center-tapped clamp circuit and an operating method thereof. The new PSFB converter using a clamp circuit connected to a center-tapped clamp circuit includes a primary-side circuit including a plurality of inductors connected to one end between a first switch and a second switch which are connected in series and to one end between a third switch and a fourth switch which are connected in series and a secondary-side circuit using a voltage applied by the primary-side circuit and including a clamping circuit configured with a first rectifier diode, a second rectifier diode, a third rectifier diode, a fourth rectifier diode, a first clamping diode, a second clamping diode and a capacitor in a center-tapped clamp circuit.

Abstract: Systems and methods to improve operation of a modular multilevel converter. Some embodiments include a first upper arm with a first active power link module, which facilitates producing a first portion of a first alternating current electrical power at a base frequency and injecting a first even-order current harmonic of the base frequency in the first upper arm, and a first lower arm with a second active power link module, which facilitates producing a second portion of the first alternating current, in which the first portion of the first alternating current and the second portion of the alternating current are combined to facilitate outputting the first alternating current electrical power at a first alternating current terminal, and injecting the first even-order current harmonic in the first lower arm, in which magnitude of the first even-order current harmonic is zero at the first alternating current terminal.

Abstract: A pulse generator is disclosed that includes at least the following stages a driver stage, a transformer stage, a rectifier stage, and an output stage. The driver stage may include at least one solid state switch such as, for example, of one or more IGBTs and/or one or more MOSFETs. The driver stage may also have a stray inductance less than 1,000 nH. The transformer stage may be coupled with the driver stage and/or with a balance stage and may include one or more transformers. The rectifier stage may be coupled with the transformer stage and may have a stray inductance less than 1,000 nH. The output stage may be coupled with the rectifier stage. The output stage may output a signal pulse with a voltage greater than 2 kilovolts and a frequency greater than 5 kHz. In some embodiments, the output stage may be galvanically isolated from a reference potential.

Abstract: An X-ray high voltage device according to an embodiment includes: an inverter circuit including a plurality of switching elements; acquiring circuitry configured to acquire information about an inverter current flowing through the inverter circuit; and controlling circuitry configured to determine, on the basis of the information about the inverter current, a first point in time at which the inverter current becomes substantially 0 and to exercise control by implementing zero current switching control on the switching elements at the first point in time and implementing zero voltage switching control on the switching elements at a second point in time excluding the first point in time.

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: A power conversion apparatus is provided in which an upper arm semiconductor device, a lower arm semiconductor device and a capacitor. At least either upper arm semiconductor device or lower arm semiconductor device constitutes a parallel-connected body. In an opposite arm against the parallel-connected body, a permissible element is provided. In the switching elements that constitute the parallel-connected body, a last off element and a non-last off circuit are identified. Inductance of a last off closed circuit where current flows through the last off element, reflux element in the opposite arm and the capacitor is smaller than inductance of a non-last off closed circuit where current flows through the last off element, reflux element in the opposite arm and the capacitor.

Abstract: A power conversion circuit board is a board on which a power conversion circuit which converts direct current to alternating current is mounted. A low voltage circuit to which a low voltage is applied and a high voltage circuit to which a high voltage is applied are separately disposed in different areas on the same board surface. Further, in the high voltage circuit, a part of a wiring is formed on the board surface, and another wiring includes a bus bar which is provided with a predetermined distance from the board surface.

Abstract: A 3-level power conversion circuit, including a high potential terminal configured to receive a high potential from a direct current (DC) power source, a low potential terminal configured to receive a low potential from the DC power source, an intermediate potential terminal configured to receive an intermediate potential from the DC power source, and an alternating current (AC) terminal configured to output an AC, the 3-level power conversion circuit being configured to perform power conversion between the high, low and intermediate potential terminals and the AC terminal. The 3-level power conversion circuit further includes a switching element and a diode connected in series between the intermediate potential terminal and the AC terminal, where the diode, but not the semiconductor switching element, includes a wideband gap semiconductor, and an ampacity of the switching element is greater than an ampacity of the diode.

Abstract: A half-bridge driver circuit is configured to generate drive signals based on control signals. A processing circuit is configured to generate high side and low side control signals based on a control signal. An edge detector is configured to generate first and second signals in response to rising and falling edges in the control signal. A state machine transitions between states in response to the first and second signals, and is configured to sequentially, in response to the first signal, set the high side and low side control signals low; in response to the second signal, set the high side control signal high and the low side control signal low; in response to the first signal, set the high side and low side control signals low; and in response to the second signal, set the high side control signal low and the low side control signal high.

Abstract: A control circuit converts power by controlling a phase difference between a switching phase of a plurality of switching elements of a first bridge circuit and a switching phase of a plurality of switching elements of a second bridge circuit such that the control circuit controls the phase difference to be smaller to reduce the output power. When the phase difference reaches a predefined lower limit value in a step-down mode of stepping down the input power, the control circuit controls an on-time of the plurality of switching elements of the second bridge circuit to be shorter while the phase difference is fixed at the lower limit value.

Abstract: A power conversion device includes a first switching unit connected between a DC power supply and an inverter circuit, a resonant circuit connected to the input of the inverter circuit and formed by connecting a capacitor, a reactor, and a second switching unit, and a control unit, wherein, during a resonant operation period in which the first switching unit is controlled to be off and the second switching unit is controlled to be on, the control unit controls the inverter circuit to shift from a mode in which current flows back through one of upper and lower arms of the inverter circuit to a mode in which current flows back through the other arm, and provides a period in which the upper and lower arms for every phase of the inverter circuit are turned on simultaneously.

Abstract: A power conversion device includes: an inverter for supplying high-frequency power to a coil; a harmonic filter connected to an output side of the inverter; and a controller for performing control to make a zero-cross point of an output current from the inverter coincide with a zero-cross point of a filter current of the harmonic filter. Through this, harmonic reduction effect can be fully exerted. Further, a contactless power supply system using the power conversion device can supply, to a load, power in which harmonics are significantly reduced, addressing a problem that inverter driving frequency cannot be controlled to a frequency at which harmonic reduction effect is maximized, and harmonic reduction effect cannot be fully exerted.

Abstract: A method for operating an inverter and an inverter configured to convert DC power supplied from a DC power source into AC power supplied to an AC network by applying maximum power point tracking, MPPT, such that a harmonic content of an AC current supplied from the inverter to the AC network is kept within a predetermined maximum level, wherein during the converting the inverter is configured to detect a need to increase the harmonic content of the AC current supplied from the inverter to the AC network beyond the predetermined maximum level, perform a check whether an increase of the harmonic content of the AC current beyond the predetermined maximum level is allowed, and, if an increase of the harmonic content of the AC current beyond the predetermined maximum level is allowed, raise the predetermined maximum level used in the converting.

Abstract: A motor drive device includes a power conversion unit configured to selectively execute a converter operation of converting AC power into DC power, and an inverter operation of converting DC power into AC power for motor driving, a power storage unit configured to store DC power output from the power conversion unit and also supply DC power to the power conversion unit, a switching unit configured to switch between an AC power supply and a motor a connection destination of the power conversion unit, and a control unit configured to control the switching unit to have the power conversion unit connected to the AC power supply and control the power conversion unit to have the converter operation executed, and configured to control the switching unit to have the power conversion unit connected to the motor and control the power conversion unit to have the inverter operation executed.

Abstract: A lighting system and a driving circuit thereof are provided. The driving circuit is configured to drive a light emitting device. The driving circuit includes a bulk voltage converter. The bulk voltage converter receives an input voltage and converts the input voltage to generate a driving voltage. The bulk voltage converter includes a snubber circuit, a power switch, and an inductor. The snubber circuit receives the input voltage through a first node and generates a snubber voltage at a second node according to the input voltage. The power switch is turned on or off according to a control signal. The inductor is coupled between the first node and a third node. The driving circuit is coupled to the light emitting device through the first node and the third node and provides the driving voltage to the light emitting device.

Abstract: In certain embodiments, an apparatus includes an inductor having first and second terminals. The first terminal is configured to be coupled to a power source. The apparatus includes a pair of serially-coupled transistors coupled to the second terminal of the inductor. A transistor intermediate node is positioned between the pair of serially-coupled transistors. The apparatus includes a pair of serially-coupled diodes coupled to the second terminal of the inductor. A diode intermediate node is positioned between the pair of serially-coupled diodes. The apparatus includes a first capacitor coupled in parallel with the serially-coupled transistors and the serially-coupled diodes. The apparatus includes a sub-circuit having a second capacitor serially-coupled with an auxiliary transistor.

Abstract: A single-phase converter control method and apparatus, includes calculating on a voltage corresponding to a first level output by a single-phase converter, a voltage corresponding to a second level output by the single-phase converter, and a voltage reference value about the voltage corresponding to the first level and the voltage corresponding to the second level to obtain a common-mode modulated-wave change rate of the single-phase converter, where the first level is a direct-current-side positive-bus level, and the second level is a direct-current-side negative-bus level, calculating on a first-phase initial modulated wave of the single-phase converter, a second-phase initial modulated wave of the single-phase converter, and the common-mode modulated-wave change rate to obtain a common-mode modulated wave of the single-phase converter, and calculating on the first-phase initial modulated wave, the second-phase initial modulated wave, and the common-mode modulated wave to obtain a pulse width modulated wave

Abstract: A power supply device includes a PF correction circuit, a power switching circuit and a control circuit. The PF correction circuit converts an input voltage to a bus voltage according to a control signal to supply a later stage circuit. The power switching circuit selectively switches to conduct a first source or a second source to the PF correction circuit to provide the input voltage to the PF correction circuit. The control circuit outputs the control signal to the PF correction circuit. When the control circuit detects a first voltage of the first source connecting to the PF correction circuit is abnormal, the control circuit determines whether a second voltage of the second source is smaller than the bus voltage and controls the power switching circuit to switch when the second voltage is smaller than the bus voltage to conduct the second source to the PF correction circuit.

Abstract: This conversion device includes: a DC bus with a smoothing capacitor; a first converter provided between a DC power supply and the DC bus to perform DC/DC conversion; a second converter provided between the DC bus and an AC electric path to perform DC/AC or AC/DC conversion by a full-bridge of switching elements; a voltage sensor for detecting voltage between both ends of the capacitor as DC bus voltage; and a control unit which causes a part of an absolute value of an AC waveform, and a DC waveform, to alternately arise as the DC bus voltage by selectively causing the first converter and the second converter to operate in one AC cycle of the AC electric path, the control unit detecting arm short-circuit in the second converter on the basis of a degree of reduction, in the DC bus voltage, that occurs during operation of the second converter.

Abstract: A control circuit for a DC-DC converter and a DC-DC converter are disclosed. The control circuit includes an integrator coupled to receive a first reference voltage and a first voltage that includes an output voltage for the DC-DC converter and to provide an integrated error signal. A first comparator is coupled to receive the first reference voltage and the first voltage and to provide a dynamic-integration signal that adjusts the integration time constant of the integrator.

Abstract: A semiconductor device includes a positive electrode-side semiconductor element, a negative electrode-side semiconductor element, a positive electrode plate, a negative electrode plate, an AC electrode plate, a positive electrode-side auxiliary electrode terminal, a negative electrode-side auxiliary electrode terminal, a positive electrode-side capacitor, and a negative electrode-side capacitor. The positive electrode plate is connected to a first positive electrode of the positive electrode-side semiconductor element. The negative electrode plate is connected to a second negative electrode of the negative electrode-side semiconductor element. The AC electrode plate is connected to a first negative electrode of the positive electrode-side semiconductor element and a second positive electrode of the negative electrode-side semiconductor element. The positive electrode-side capacitor is connected to the positive electrode plate and the positive electrode-side auxiliary electrode terminal.

Abstract: The invention relates to a drive system, in particular for a vehicle, comprising a fuel cell unit for generating electric energy, a secondary battery for storing electric energy, an electric machine with windings, and an inverter for actuating the electric machine. The inverter is designed as a 3-level inverter and has multiple electronic switches, diodes, a plus pole, a minus pole, and a neutral pole. The fuel cell unit and the secondary battery are connected in series and are connected to the poles of the inverter. The invention also relates to a method for heating a drive system according to the invention, wherein the switches of the inverter are actuated such that a short-circuit current path is produced between the poles of the inverter to which the fuel cell unit is connected.

Abstract: A power supply includes a reference voltage generator, a power supply phase, and an adjustor. During operation, the reference voltage generator produces a reference voltage. The power supply phase produces an output voltage to power a load as a function of an output voltage feedback signal derived from the output voltage and the reference voltage. The adjustor adjusts a magnitude of the reference voltage to maintain regulation of the output voltage with respect to a desired voltage setpoint.

Abstract: A fan apparatus has a drive circuit for an electrically-driven rotor, and includes a drive signal generating circuit portion for the electrically-driven rotor; an output stage including an upper MOSFET and a lower MOSFET; and a motor portion to be driven by the output stage. One of the upper MOSFET and the lower MOSFET is a braking MOSFET, while another of the upper MOSFET and the lower MOSFET is a non-braking MOSFET. The fan apparatus further includes a back-electromotive force supply portion arranged to supply, to the braking MOSFET, power by a back-electromotive force caused by rotation of the motor portion while a power supply voltage for the electrically-driven rotor is not being supplied; and an electromagnetic brake portion arranged to electromagnetically brake the motor portion by causing the braking MOSFET to enter an ON state through the power supplied by the back-electromotive force supply portion.

Abstract: A pulse width modulation method, a pulse width modulation system, and a controller are provided, which change a change rate of a common-mode component of a three-phase converter upon a change of a converter modulation degree, thereby improving stability and harmonic characteristics of the three-phase converter and implementing flexible adaptive adjustment. An example pulse width modulation method includes: obtaining initial three-phase modulation waves and a converter modulation degree; calculating a common-mode-component change-rate adjustment coefficient based on preset modulation parameters and the converter modulation degree; selecting a modulation wave having a minimum absolute value from the modulation wave set as a common-mode modulation wave; and performing waveform superposition on the initial three-phase modulation waves and the common-mode modulation wave to obtain output three-phase modulation waves.

Abstract: With the disclosed device, a control method is set forth to control the flow of power between an electrical source and an electrical load.

Abstract: A power electronic system for an electricity charging station having the following features: first busbars for feeding in an alternating current, second busbars for conducting away a direct current, a third busbar for grounding the system, ground cables connected to the first busbars, the second busbars and the third busbar, and power electronic assemblies for converting the alternating current into the direct current. The invention furthermore provides an electricity charging station including such a power electronic system.

Abstract: The present invention discloses a control method and device for a circuit with a bridge arm of a switch. The soft switching converter includes at least two bridge arms of the switch, and an auxiliary switch assisting in switching of a main switch of the bridge arm of the switch. The control method includes the steps of: S1. after controlling the auxiliary switch to be turned on for a first period of time, controlling main switches set at the same position of individual bridge arms of the switch to be simultaneously turned on; S2. after a second period of time following a time when the main switches set at the same position of individual bridge arms of the switch are simultaneously turned on, turning off the auxiliary switch. The present invention can reduce system loss and noise, so as to improve efficiency.