Abstract: A single-stage AC-DC converter circuit with a power factor correction function. The single-stage AC-DC converter circuit comprises a primary-side AC-DC converter, a transformer, a secondary-side AC-DC converter and a controller which are connected to each other. The primary-side AC-DC converter is configured to convert an AC power source into DC. The secondary-side AC-DC converter is configured to convert electrical energy into DC and supply power to a load. The controller is configured to control duty ratios of power switches in the primary-side and secondary-side AC-DC converters, and a phase difference between control signals for the power switches, and finally control the amount of electrical energy transfer and correct a power factor. The single-stage AC-DC converter circuit of the present invention reduces the capacity and volume of a filter inductor and a voltage stabilizing capacitor, and has the advantages of simple circuit and low cost.

Abstract: The present invention discloses an on-board integrated charging device and a current distribution calculating method thereof. The on-board integrated charging device comprises a voltage conversion module. The voltage conversion module is provided with an AC terminal connected to an alternating current or an alternating current load, an HV terminal connected to a power battery and an LV terminal connected to a direct current load. When the AC terminal is idle, the LV terminal is powered by the HV terminal, and an input current of the LV terminal is an actual current of the HV terminal. According to the on-board integrated charging device, OBC, DCAC and DCDC functions can be integrated on the same circuit board, a current reporting requirement can be realized through a distribution algorithm, and the volume and weight of the whole device can be reduced.

Abstract: A single-phase and three-phase compatible conversion circuit includes an EMC module, a PFC module, a switch K1 and a control module. The EMC module is connected between lines A, B, C and N of a power grid and the PFC module. Three lines A1, B1 and C1 are led out from the EMC module and are connected with the PFC module, and are respectively connected to a set virtual midpoint through capacitors CX1, CX2, and CX3. The virtual midpoint is connected to a bus midpoint of the PFC module through the switch K1. The control module is used for detecting a power grid input signal and controlling the state of the switch K1 according to the type of the power grid input signal. The common-mode noise of the three-phase conversion mode can be reduced, and the three-phase conversion mode can be controlled within a larger bus voltage regulation range.

Abstract: A pre-chargeable DCDC conversion circuit includes a high-voltage side conversion module connected to a primary winding of a main transformer T1, a low-voltage side conversion module connected to a secondary winding of the main transformer, and a controller used for controlling the high-voltage side conversion module and the low-voltage side conversion module. A pre-charging module is connected in series in a direct-current bus of the low-voltage side conversion module, and the pre-charging module is used for pre-charging a capacitor of electric equipment connected to a direct-current bus of the high-voltage side conversion module when the complete machine is powered on. The pre-charging module and a forward DCDC share most of power devices and power loops, and only a small number of devices are added, such that the volume and cost are reduced compared with an independent pre-charging branch, and the control mode is simple.

Abstract: The present invention discloses an insulation detection circuit and a detection method thereof for a two-way on-board charger. The detection circuit comprises an inverter circuit, a first Y capacitor connected between an output live line and a ground line of the inverter circuit, a second Y capacitor connected between an output neutral line and the ground line of the inverter circuit, a live line sampling circuit and a neutral line sampling circuit which are connected with the output live line and the output neutral line of the inverter circuit, and a controller. The controller determines an insulation state of the two-way on-board charger according to two sampling voltages.

Abstract: A magnetic balance circuit of a bidirectional resonant converter and a control method thereof are provided. The magnetic balance circuit includes a primary conversion circuit, a transformer, a secondary conversion circuit, and a controller. Said primary conversion circuit is connected to a primary winding of said transformer through a first capacitor, a current transformer is set between the secondary winding of said transformer and said secondary conversion circuit. According to the positive component of the current in the cavity of the secondary conversion circuit and the negative component of the current in the cavity of the secondary conversion circuit, said controller further controls the duty ratios of the switches in the secondary conversion circuit. In the invention, the magnetic deviation phenomenon on both sides of the bidirectional resonant converter is effectively eliminated to achieve balance control for the magnetic circuit, thereby avoiding saturation.

Abstract: A three-port charger with an inversion function includes a primary side conversion circuit connected with a primary side winding of a transformer, a secondary side first conversion circuit connected with a second winding of the transformer, a secondary side second conversion circuit connected with a third winding of the transformer and a fourth winding of the transformer which are connected in series, and a central control unit used for controlling switches in the primary side conversion circuit, the secondary side first conversion circuit and the secondary side second conversion circuit. The primary side conversion circuit is connected with an external power supply, the secondary side first conversion circuit is connected with a high-voltage battery. The secondary side second conversion circuit is connected with a low-voltage load. The present invention integrates the independent charger and a high-power DCDC module, and shares a power switch, a control circuit and a magnetic core.

Abstract: An installation structure and an installation method of a plug-in switch tube is disclosed in the present invention, the installation structure comprises, a PCB board, a plug-in switch tube fixed on said PCB board, and a housing matching said PCB board and said plug-in switch tube, wherein the lower end surface of said housing is provided with a cooling liquid flow channel, and said plug-in switch tube is pressed against the side wall of the cooling liquid flow channel by an elastic pressing-piece. The installation structure according to the present invention has the advantages of small volume, excellent heat dissipation effect, simple assembly, low cost and light weight.

Abstract: A phase shift control method for a charging circuit is disclosed. The charging circuit includes a primary conversion circuit, a first secondary conversion circuit, and a second secondary conversion circuit. The controller causes a phase angle difference ? between an ON/OFF waveform of power switches in the primary conversion circuit and an ON/OFF waveform of power switches in the first secondary conversion circuit. The controller collects an output current (Io1) and an output voltage (Vo1) of the first secondary conversion circuit, collected by the first secondary current collector and the first secondary voltage collector, carries out comparison and calculation between the collected output current and output voltage and a preset output current and output voltage, and adjusts the magnitude and positive and negative of the phase angle difference ? according to the comparison result.