Abstract: The disclosure discloses a method and device for detecting insulation state in a conversion system, wherein the conversion system includes an excitation source, a converter having an input end coupled to the excitation source, a connection element coupled between an output end of the converter and a reference point, and a coupling impedance having a first end coupled to the excitation source and a second end coupled to the reference point, the method for detecting insulation state including steps of: S1, controlling at least one main power switch of the converter not to switch; S2, detecting a pulse current signal of the connection element; and S3, processing the pulse current signal and outputting a partial discharge information, the partial discharge information indicating an insulation state of an isolating transformer in the converter. The disclosure can overcome electromagnetic interference of high frequency steep waves on a partial discharge signal.

Abstract: The present application provides a wireless charging transmitting apparatus, comprising: a charging module comprising a charging coil; a plurality of electromagnet units arranged around the charging coil to form an electromagnet array; and a control unit for acquiring state information of a charging receiving apparatus, generating configuration information of the respective electromagnet units, and activating and configuring the electromagnet units to be a magnetic structure matched with the charging receiving apparatus, and the control unit controlling the charging module. The application further provides a method for controlling charging using the wireless charging transmitting apparatus. According to the embodiments of the application, the wireless charging transmitting apparatus is effectively compatible with and adapted to various types of charging receiving apparatuses by configuring the electromagnet units according to the state information of the charging receiving apparatus.

Abstract: The application provides a photovoltaic inverter system, an automatic locating method of RSDs and a fault control method thereof. The automatic locating method comprises turning off all RSDs and sampling a voltage of an output end of each RSD as a first voltage before an inverter operates; turning on any one of the RSDs and sampling a voltage of the output end of each RSD as a second voltage, determining all RSDs in a photovoltaic module string to which the RSD in a turned-on state belongs according to the first voltage and the second voltage, and repeating the above control method for any one of the RSDs outside the photovoltaic module string to which the determined RSDs belong until corresponding connection relations between all RSDs and all photovoltaic module strings are determined.

Abstract: A power supply system includes a system board electrically connected to a load; a first package and a second package provided on an upper side of the system board; and a bridge member provided on upper sides of the first package and the second package, comprising a passive element and used for power coupling between the first package and the second package, wherein vertical projections of the first package and the second package on the system board are both overlapped with a vertical projection of the bridge member on the system board, the first package, and the second package are encapsulated with switching devices, terminals on upper surfaces of the first package and the second package are electrically connected to the bridge member, and terminals on lower surfaces thereof are electrically connected to the system board.

Abstract: Embodiments of the present application provide a transformer and a bidirectional isolated resonant converter, where the transformer includes a first side winding, a second side winding, and a magnetic core. The magnetic core includes a winding column, at least one side column and two connecting portions. The first side winding includes: a first side first winding and a first side second winding that are electrically connected, and the second side winding is located between the first side first winding and the first side second winding. An air gap is provided on the winding column, and the air gap is provided between the second side winding and a first end surface of the winding column, and a first side equivalent leakage inductance and a second side equivalent leakage inductance are obtained through the air gap.

Abstract: A resonant converter includes primary and secondary circuits, a transformer, a resonant network and a control circuit. The control circuit is coupled to the primary circuit and the secondary circuit, and configured to control primary switches of the primary circuit operating with a switching frequency. At least one of primary switches is configured to be turned on from a first switching moment until a second switching moment. The control circuit is configured to control secondary switches of the secondary circuit, such that at least one of secondary switches is turned on during a first time interval to increase a current of the resonant network in a first flowing direction and an output current in a second flowing direction or equal to zero.

Abstract: A method for controlling a power module includes: configuring N cells in cascade connection, where N is a positive integer equal to or greater than 2, each cell comprising a bidirectional switching unit and a non-controlled rectifier bridge, the bidirectional switching unit being connected to central points of two bridge arms of the non-controlled rectifier bridge; controlling each cell to operate in one of three operating modes of a modulation mode, a bypass mode and a non-controlled rectifying mode, wherein in the N cells, m1 cells operate in the bypass mode, where 0?m1?M1, m2 cells operate in the non-controlled rectifying mode, where 0?m2?M2, m3 cells operate in the modulation mode and can realize power factor correction, where 0<m3; wherein m1+m2+m3=N, M1 is the allowable number of cells for bypass in the system, and M2 is the allowable number of cells for non-controlled rectification in the system.

Abstract: The disclosure discloses a cooling system and an automatic coolant injection method for the cooling system. The cooling system includes a heat exchanger; a converter; a liquid cooling pipeline; a coolant tank with a liquid-level sensor; an injection pump for injecting coolant from the coolant tank into the liquid cooling pipe; and a control unit. When liquid level of the coolant tank reaches an upper threshold, the injection pump injects coolant into the liquid cooling pipeline. When pressure of the coolant in the liquid cooling pipe reaches an upper static liquid pressure threshold, the control unit turns off the injection pump, and executes the turning-on and turning-off operations of the circulation pump with a preset circulation period. The circulation pump forces the coolant to circulate in the liquid cooling pipeline when being turned on.

Abstract: The disclosure provides a power supply module, including a transformer including magnetic core and winding, and a rectifier circuit electrically connected to the winding, wherein the magnetic core further comprises: a first and a second cover plate opposite to each other; a first magnetic column; and a second magnetic column having a magnetic flux in opposite direction to that of the first magnetic column, the first and second magnetic column connected between the first and the second cover plate; the winding further includes: a first winding wound onto the first magnetic column; and a second winding wound onto the second magnetic column, wherein the first and second winding have a shared winding portion at least partially located between the first and second magnetic column; the rectifier circuit includes a plurality of rectifier components including first to fourth rectifier component electrically connected to form a full bridge rectifier circuit.

Abstract: The present disclosure relate to a fault diagnosis method, including: collecting at least one set of original data of the high voltage generator during operation, each condition attribute in a condition attribute set corresponding to one piece of original data; pre-processing the original data to obtain pre-processed data and generating a decision table; performing an attribute reduction based on the decision table to obtain a reduced condition attribute set and a reduced decision table; generating a decision tree model according to the reduced decision table; generating a decision forest model according to at least one decision tree model; obtaining a fault type and a fault level according to the decision forest model; determining an acceptable level of the fault according to the fault level and a frequency of occurrence of the same type of fault, and sending the fault type and the acceptable level to the display terminal.

Abstract: The present disclosure provides a magnetic component and a power module, relating to the technical field of power electronics; the magnetic component provided by the present disclosure includes: a first heat sink, a magnetic core extending in a transverse direction and a winding structure wound on the magnetic core, the winding structure includes at least a first coil and a second coil arranged adjacently along the transverse direction, a gap is provided between the first coil and the second coil, at least part of the first heat sink is arranged in the gap, the first heat sink is in thermal contact with the first coil, the second coil and the magnetic core.

Abstract: The present disclosure provides a transformer module and a power module, wherein the transformer module comprises: a magnetic core, where a first insulating layer and a second wiring layer are sequentially disposed on the magnetic core from inside to outside; a first metal winding, wound around the magnetic core in a foil structure, and comprising a first winding segment formed in the first wiring layer and a second winding segment formed in the second wiring layer; and a second metal winding, wound around the magnetic core in a foil structure, comprising a third winding segment formed in the first wiring layer and a fourth winding segment formed in the second wiring.

Abstract: A magnetic component includes a magnetic core and a first winding module. The magnetic core has two opposite openings and at least one magnetic column. The first winding module has a plurality of annular metal plates disposed around the at least one magnetic column. Each of the annular metal plates has an electrical connection end, an annular portion and a heat-dissipating end. The electrical connection end and the heat-dissipation end are located at the two opposite openings of the magnetic core respectively. A thermal-dissipating area of the heat-dissipating end is greater than a cross-sectional area of a connection portion between the heat-dissipating end and the annular portion.

Abstract: The embodiments of the present disclosure provide a switching method and a multi-input power system, where the method is used to control an input power source connected with N power supply units, and N is greater than 1, and the method includes: determining a switching strategy for each power supply unit, where the switching strategy is used to indicate a moment when input of a power supply unit is switched from an auxiliary input power source to a main input power source; switching, according to the switching strategy, the input of each power supply unit from the auxiliary input power source to the main input power source at the moment indicated by the switching strategy, where the main input power source includes a standby power source.

Abstract: A charging pile includes a plurality of charging guns and a single heat dissipation module. The plurality of charging guns is connected to the heat dissipation module for heat dissipation via heat exchange. A power distribution system for the charging pile includes: a power module for supplying power to the plurality of charging guns; a control unit connected to the power module and the heat dissipation module for determining an output current of each charging gun depending on the maximum heat dissipation power PlossMax of the heat dissipation module and the maximum heat loss PchargerMax of each charging gun when the plurality of charging guns charge simultaneously; and a power distribution unit connected to the power module and the control unit for distributing the power supplied by the power module to a device through a charging gun connected thereto depending on the output current of that charging gun.

Abstract: A hybrid flyback circuit is provided and includes an upper switch, a lower switch, a transformer, a resonant circuit, a current sampling circuit and a control unit. The control unit includes an output voltage feedback unit, a peak current comparison unit controlling the upper switch to turn off when a sampling voltage corresponding to the current sampling signal is equal to the first voltage feedback signal, a first dead time delay unit controlling the lower switch to turn on after a first dead time starting from the turn-off time of the upper switch, a negative peak current feedback unit for generating a second voltage feedback signal, a conduction control unit controlling the lower switch to turn off, and a second dead time delay unit controlling the upper switch to turn on after a second dead time starting from the turn-off time of the lower switch.

Abstract: A circuit for preventing false turn-on of a semiconductor switching device includes an active clamp circuit, a control circuit, a power amplifier circuit, and a suppression circuit. The control circuit is coupled to an input of the power amplifier circuit. An output of the power amplifier circuit is coupled to a gate of the semiconductor switching device. The active clamp circuit is configured to operate within a preset period when a voltage between the first end of the semiconductor switching device and a second end of the semiconductor switching device is greater than a preset voltage. The suppression circuit includes a controllable switch, which is configured to turn on after the operation of the active clamp circuit is completed, such that potential at the input of the power amplifier circuit is clamped to a fixed potential.

Abstract: The embodiments of the present disclosure provide a power management system of a mobile X-ray machine and a control method thereof. The power management system comprises a power module group; a main control module being connected with a upper machine, and configured to receive an action signal sent by the upper machine, acquire status information of the power module group, and output a control signal; a functional component power pack being connected with the power module group and the main control module, and configured to convert electrical energy of the power module group according to the control signal and output converted energy to a functional component of a high-voltage generator.

Abstract: A vertical power supply system and a manufacturing method of a connection board are provided. The vertical power supply system includes a system board, a substrate, a chip unit, a plurality of first capacitors, a plurality of second capacitors, a plurality of conductive portions and a power unit. The system board includes a first surface and a second surface which are opposite to each other. The substrate includes a third surface and a fourth surface which are opposite to each other, and the third surface is located between the fourth surface and the second surface. The chip unit is disposed on the first surface. The first capacitors are disposed on the second surface. The second capacitors are disposed on the third surface. The third surface and the second surface are electrically connected through the conductive portions. The power unit is disposed on the fourth surface.