All-in-one power supply device for realizing multiplexing of bridge arms, power assembly and electric vehicle

Abstract

The invention discloses an all-in-one power supply device for realizing bridge arm multiplexing, a power assembly and an electric vehicle, and relates to the technical field of new energy automobiles. The all-in-one power supply device comprises a vehicle-mounted charger circuit, a three-phase inverter circuit and a direct current conversion circuit, the direct current conversion circuit is used for carrying out voltage reduction conversion on direct current output by a power battery to supply power to a low-voltage load, and the direct current conversion circuit comprises a primary side bridge arm, a transformer, a switch unit and a secondary side circuit, one end of a primary winding of the transformer is used for being connected with a bridge arm midpoint of a primary bridge arm, the other end of the primary winding is used for being selectively communicated with a bridge arm midpoint of one of a vehicle-mounted charger circuit and a three-phase inverter circuit through a switch unit, and a secondary winding of the transformer is used for supplying power to a secondary circuit. The secondary circuit is used for supplying power to a low-voltage load. According to the scheme, the integration level can be effectively improved, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of electric vehicles, and more specifically, to an all-in-one power supply device, a power assembly and an electric vehicle for realizing bridge arm multiplexing. Background Art

[0002] With the development of the vehicle industry, the integration of electric vehicle components continues to increase. The high degree of integration not only improves the reliability of the integrated system, improves the lightweight design of the vehicle, significantly improves power efficiency and performance, but also effectively reduces costs. All-in-one powertrains have gradually become an industry development trend, and creating deeply integrated all-in-one components that pursue extreme costs has become an important focus.

[0003] Existing all-in-one products integrate on-board chargers (OBC), DC / DC converters (DCDC) and motor control units (MCU). However, current all-in-one products simply integrate multiple components together, integrating the controllers and structures of OBC / DCDC / MCU, which were originally controlled by independent controllers, without deep integration in power topology, resulting in high costs.

[0004] Therefore, how to improve the integration of all-in-one devices and reduce costs is a problem that needs to be solved. Summary of the invention

[0005] The present application provides an all-in-one power supply device, a power assembly and an electric vehicle that realize bridge arm reuse, and reuses the bridge arms of other circuits as the bridge arms of the DC conversion circuit, which can effectively improve the integration and reduce the cost.

[0006] In the first aspect, the present application provides an all-in-one power supply device for realizing bridge arm reuse, the all-in-one power supply device includes an on-board charger circuit, a three-phase inverter circuit and a DC conversion circuit, the on-board charger circuit is used to receive AC power supply and charge the power battery of the electric vehicle, the three-phase inverter circuit is used to receive power from the power battery and power the drive motor or compressor of the electric vehicle, the DC conversion circuit is used to step down the DC power output by the power battery to power a low-voltage load, the DC conversion circuit includes a primary bridge arm, a transformer, a switch unit and a secondary circuit, wherein one end of the primary winding of the transformer is used to connect the midpoint of the bridge arm of the primary bridge arm, and the other end of the primary winding is used to selectively connect the on-board charger circuit or the midpoint of the bridge arm of one of the bridge arms of the three-phase inverter circuit through the switch unit, the secondary winding of the transformer is used to power the secondary circuit, and the secondary circuit is used to power the low-voltage load.

[0007] The on-board charger circuit and the three-phase inverter circuit each include at least one bridge arm. The bridge arm refers to two electronic switching devices connected in series, and the midpoint of the bridge arm refers to the connection between the two electronic switching devices. The electronic switching device is composed of an insulated gate bipolar transistor and an anti-parallel diode. The electronic switching device can also be composed of other electrical components.

[0008] The DC conversion circuit is used to connect to the power battery and the low-voltage load. The DC conversion circuit converts the high-voltage DC power into low-voltage DC power to supply power to the low-voltage load. The low-voltage load in this application is a low-voltage electrical device or a low-voltage battery in an electric vehicle, and there can be multiple low-voltage loads. The DC conversion circuit converts the high-voltage DC power into low-voltage power through a transformer, and the transformer includes a primary winding and a secondary winding. The primary winding of the transformer receives current through two bridge arms, and one of the two bridge arms reuses a bridge arm in the on-board charger circuit or a three-phase inverter circuit.

[0009] Since the on-board charger circuit needs to charge the power battery, one of the bridge arms in the on-board charger circuit works when supplying power to the power battery, and cannot be used as a bridge arm when the DC conversion circuit performs step-down conversion. The three-phase inverter circuit needs to supply power to the drive motor, and one of the bridge arms in the three-phase inverter circuit works when supplying power to the drive motor, and cannot be used as a bridge arm when the DC conversion circuit performs step-down conversion. Therefore, the other end of the primary winding is selectively connected to the midpoint of the bridge arm of the on-board charger circuit or one of the bridge arms of the three-phase inverter circuit through the switch unit, thereby avoiding conflicts between the on-board charger circuit and the three-phase inverter circuit during normal operation.

[0010] When the electric vehicle is parked and charged, the three-phase inverter circuit controls the drive motor to stop working, and the DC conversion circuit conducts the connection between the midpoint of one bridge arm of the three-phase inverter circuit and the other end of the primary winding of the transformer through the switch unit, and disconnects the connection between the midpoint of one bridge arm of the on-board charger circuit and the other end of the primary winding of the transformer. At this time, the DC conversion circuit uses the switch device of one bridge arm of the three-phase inverter circuit as the high-frequency switch device of the DC conversion circuit. Since the other two bridge arms of the three-phase inverter circuit are not working, no additional torque and current are generated. At the same time, it does not affect the on-board charger circuit to receive AC power from the external power supply and charge the power battery and / or low-voltage load.

[0011] When the electric vehicle is running, the on-board charger is not working, and the DC conversion circuit conducts the connection between the midpoint of one bridge arm of the on-board charger and the other end of the primary winding of the transformer through the switch unit, and disconnects the connection between the midpoint of one bridge arm of the three-phase inverter circuit and the other end of the primary winding of the transformer. At this time, the DC conversion circuit uses the switch device of one bridge arm of the on-board charger as the high-frequency switch device of the DC conversion circuit. Since the remaining switch bridge arms of the on-board charger are not working, no actual energy transmission will be generated. At the same time, it does not affect the three-phase inverter circuit receiving the power battery current to power the drive motor or receiving the current generated by the drive motor to charge the power battery.

[0012] According to the solution of the present application, by utilizing the characteristics of the working time of the on-board charger and the motor controller, the bridge arm of the on-board charger or the three-phase inverter circuit is reused as the bridge arm of the DC conversion circuit through the control of the switch unit, thereby improving the integration and reducing the cost.

[0013] In combination with the first aspect, in certain implementations of the first aspect, when the on-board charger circuit is used to charge the power battery, the switch unit disconnects the connection between the midpoint of a bridge arm of the on-board charger circuit and the other end of the primary winding and connects the midpoint of a bridge arm of the three-phase inverter circuit and the other end of the primary winding. One bridge arm of the three-phase inverter circuit and the primary bridge arm are used to supply power to the primary winding.

[0014] The on-board charger OBC circuit is used to receive power from an external power source and convert the AC power provided by the external power source into DC power to charge the power battery. In the process of charging the power battery, the on-board charger circuit needs to use all bridge arms for circuit control, so any bridge arm cannot be reused as a bridge arm of the primary side of the DC conversion circuit. At this time, the switch unit shuts off the connection between the other end of the primary winding of the transformer and the midpoint of the bridge arm of one of the bridge arms of the on-board charger circuit. At the same time, in the process of the on-board charger circuit charging the power battery, the three-phase inverter circuit does not need to supply power to the drive motor, the bridge arm of the three-phase inverter circuit is reused, and the switch unit conducts the connection between the midpoint of the bridge arm of one of the bridge arms of the three-phase inverter circuit and the other end of the primary winding.

[0015] According to the solution of the present application, the connection between the bridge arm of the reused on-board charger circuit or the three-phase inverter circuit and the primary winding is controlled by the on and off control of the switch unit, thereby avoiding the inability to use the DC conversion circuit when the on-board charger is working, improving availability and reducing costs.

[0016] In combination with the first aspect, in certain implementations of the first aspect, the on-board charger circuit is further used to convert the DC power output by the power battery into AC power to power the AC load. In the process of the on-board charger circuit powering the AC load, the switch unit disconnects the connection between the midpoint of one bridge arm of the on-board charger circuit and the other end of the primary winding and connects the midpoint of one bridge arm of the three-phase inverter circuit and the other end of the primary winding.

[0017] The on-board charger circuit is also used to receive power from the power battery and convert the DC power output by the power battery into AC power to power the AC load. When the on-board charger circuit is supplying power to the AC load, it is necessary to use all bridge arms for circuit control, so any bridge arm cannot be reused as a bridge arm of the primary side of the DC conversion circuit. At this time, the switch unit disconnects the connection between the other end of the primary winding of the transformer and the midpoint of the bridge arm of one of the bridge arms of the on-board charger circuit. At the same time, when the on-board charger circuit is supplying power to the AC load, the three-phase inverter circuit does not need to supply power to the drive motor, the bridge arm of the three-phase inverter circuit is reused, and the switch unit conducts the connection between the midpoint of the bridge arm of one of the bridge arms of the three-phase inverter circuit and the other end of the primary winding.

[0018] According to the solution of the present application, the connection between the bridge arm of the reused on-board charger circuit or the three-phase inverter circuit and the primary winding is controlled by the on and off control of the switch unit, thereby avoiding the inability to use the DC conversion circuit when the on-board charger is working, improving availability and reducing costs.

[0019] In combination with the first aspect, in certain implementations of the first aspect, when the three-phase inverter circuit is used to power the drive motor, the switch unit turns on the connection between the midpoint of a bridge arm of the on-board charger circuit and the other end of the primary winding and disconnects the connection between the midpoint of a bridge arm of the three-phase inverter circuit and the other end of the primary winding, and one bridge arm of the on-board charger circuit and the primary bridge arm are used to power the primary winding.

[0020] The three-phase inverter circuit is used to receive power from the power battery and convert the DC power provided by the power battery into AC power to power the drive motor. The three-phase inverter circuit includes three-phase bridge arms, and the midpoint of each bridge arm is used to connect the three-phase winding of the stator of the drive motor, and the DC conversion circuit reuses any bridge arm in the three-phase inverter circuit. In the process of the three-phase inverter circuit supplying power to the drive motor, all bridge arms need to be used for circuit control, so any bridge arm cannot be reused as a bridge arm of the primary side of the DC conversion circuit. At this time, the switch unit shuts off the connection between the other end of the primary winding of the transformer and the midpoint of the bridge arm of one bridge arm of the vehicle three-phase inverter circuit. At the same time, in the process of the three-phase inverter circuit supplying power to the drive motor, the on-board charger circuit does not need to supply power to the power battery, and the bridge arm of the on-board charger circuit is reused, and the switch unit conducts the connection between the midpoint of the bridge arm of one bridge arm of the on-board charger circuit and the other end of the primary winding.

[0021] The three-phase inverter circuit is also used to receive the AC power generated by the drive motor and convert the AC power generated by the drive motor into DC power to charge the power battery. In the process of receiving the AC power generated by the drive motor, the three-phase inverter circuit needs to use all bridge arms for circuit control, so any bridge arm cannot be reused as a bridge arm of the primary side of the DC conversion circuit. At this time, the switch unit shuts off the connection between the other end of the primary winding of the transformer and the midpoint of the bridge arm of one of the bridge arms of the vehicle three-phase inverter circuit. At the same time, in the process of receiving the AC power generated by the drive motor, the on-board charger circuit does not need to supply power to the power battery, the bridge arm of the on-board charger circuit is reused, and the switch unit conducts the connection between the midpoint of the bridge arm of one of the bridge arms of the on-board charger circuit and the other end of the primary winding.

[0022] The on-board charger circuit is used to charge the power battery, and the three-phase inverter circuit is used to power the drive motor. The power battery and the drive motor do not need to be powered at the same time. Therefore, the DC conversion circuit reuses one bridge arm of the on-board charger circuit or one bridge arm of the three-phase inverter circuit to make full use of the working time of the on-board charger circuit and the three-phase inverter circuit.

[0023] According to the solution of the present application, the connection between the bridge arm of the reused on-board charger circuit or the three-phase inverter circuit and the primary winding is controlled by the on and off control of the switch unit, thereby avoiding the inability to use the DC conversion circuit when the three-phase inverter circuit is working, improving availability and reducing costs.

[0024] In combination with the first aspect, in certain implementations of the first aspect, the all-in-one power supply device includes two circuit boards, one of the two circuit boards is used to carry electrical components of the vehicle charger circuit, the primary bridge arm and the transformer, and the other of the two circuit boards is used to carry electrical components of the secondary circuit.

[0025] The all-in-one power supply device includes two circuit boards, which are used to carry the electrical components of the on-board charger circuit, the three-phase inverter circuit, and the DC conversion circuit. The two circuit boards carry different electrical components. One of the two circuit boards is used to carry the electrical components of the on-board charger circuit, the primary bridge arm, and the transformer. The primary circuit of the on-board charger circuit and the DC conversion circuit is the high-voltage side. The other of the two circuit boards is used to carry the electrical components of the secondary circuit. The complex circuit of the DC conversion circuit is the low-voltage side.

[0026] According to the solution of the present application, the safety and availability of the all-in-one power supply device are improved by respectively carrying high-voltage and low-voltage electrical components on two circuit boards.

[0027] In combination with the first aspect, in certain implementations of the first aspect, one of the two circuit boards is also used to carry electrical components of the three-phase inverter circuit.

[0028] The three-phase inverter circuit is also a high-voltage side circuit. The electrical components of the three-phase inverter circuit are carried on the same circuit board as the on-board charger circuit, the primary bridge arm, and the electrical components of the transformer.

[0029] According to the solution of the present application, the electrical components of the three-phase inverter circuit and other high-voltage electrical components are carried on the same circuit board, thereby improving the safety and availability of the all-in-one power supply device.

[0030] In combination with the first aspect, in certain implementations of the first aspect, the all-in-one power supply device further includes a shell, the shell is used to accommodate two circuit boards, and the two circuit boards are stacked in the shell.

[0031] The shell of the all-in-one power supply device accommodates two circuit boards. The circuit board carrying high-voltage circuit electrical components and the circuit board carrying low-voltage electrical components are stacked, which reduces interference between the high and low voltage electrical components and reduces the volume of the all-in-one power supply device.

[0032] The housing further includes a power battery interface for connecting to a power battery of an electric vehicle, an external interface for connecting to an AC load or an AC power source, and a load interface for connecting to a low-voltage load. The all-in-one power supply device is used to receive AC power provided by an external AC power source or to supply power to an external AC load through the external interface, and is also used to charge the power battery or receive power from the power battery through the power battery interface, and is also used to supply power to a low-voltage load through the load interface.

[0033] The all-in-one power supply device is connected to other components through multiple interfaces on the housing. The on-board charger, motor controller and DC conversion circuit are all connected to the power battery through the power battery interface, and receive current from the power battery or charge the power battery through the power battery interface. The on-board charger is connected to the AC power source or AC load through the external interface, and receives AC power from the AC power source or supplies power to the AC load through the external interface. The DC conversion circuit is connected to the low-voltage load through the load interface, and supplies power to the low-voltage load through the load interface.

[0034] According to the solution of the present application, the on-board charger, motor controller and DC conversion circuit are arranged in the same housing and connected to other components through interfaces. The circuit boards in the housing are stacked, which improves the integration of the all-in-one power supply device and reduces the cost.

[0035] In combination with the first aspect, in some implementations of the first aspect, the primary bridge arm includes a first capacitor and a second capacitor connected in series.

[0036] The primary side topology of the transformer in the DC conversion circuit is a hard-switching half-bridge circuit, and the first capacitor and the second capacitor connected in series in the primary side bridge arm form a half-bridge capacitor.

[0037] In combination with the first aspect, in some implementations of the first aspect, the primary bridge arm includes two switching tubes connected in series.

[0038] The primary side topology of the transformer in the DC conversion circuit is a hard-switching full-bridge circuit, and the two switching tubes connected in series in the primary side bridge arm and the two switching tubes on a reused bridge arm form a full-bridge bridge arm.

[0039] In combination with the first aspect, in certain implementations of the first aspect, the switching unit is a single-pole double-throw switch, the common contact of the single-pole double-throw switch is used to connect the other end of the primary winding, and the two contacts of the single-pole double-throw switch are respectively used to connect the midpoint of a bridge arm of a vehicle charger circuit and the midpoint of a bridge arm of a three-phase inverter circuit.

[0040] The switch unit is a single-pole double-throw switch, which controls the other end of the primary winding to be connected to the midpoint of a bridge arm of the on-board charger circuit or the midpoint of a bridge arm of the three-phase inverter circuit by switching the contacts, thereby controlling the DC conversion circuit to reuse the bridge arm of the on-board charger circuit or the three-phase inverter circuit. The switch unit can also be a combination of multiple switches, and the topology of the multiple switches can achieve the same control effect.

[0041] According to the solution of the present application, by setting the switch unit as a single-pole double-throw switch, the circuit structure is simplified and the cost is reduced.

[0042] In combination with the first aspect, in certain implementations of the first aspect, the all-in-one power supply device also includes a filtering circuit, which is used to filter the output current or the ripple of the output current of the power battery. The on-board charger circuit charges the power battery through the filtering circuit, and the three-phase inverter circuit and the DC conversion circuit receive power from the power battery through the filtering circuit.

[0043] The on-board charger circuit, three-phase inverter circuit and DC conversion circuit are all connected to the power battery through the same filter circuit, which is used to filter the output current or output current ripple of the power battery. The DC conversion circuit converts the high-voltage DC voltage output by the power battery into a low-voltage DC voltage to charge the low-voltage battery, and also converts the low-voltage DC output by the low-voltage battery into a high-voltage DC voltage to pre-charge the capacitor in the filter circuit.

[0044] According to the solution of the present application, the on-board charger, the motor controller and the DC conversion circuit share a filter circuit, which reduces the impact of the filter and further reduces costs.

[0045] In combination with the first aspect, in certain implementations of the first aspect, the on-board charger circuit includes a power factor correction circuit and a power conversion circuit. The power factor correction circuit is used to convert the AC power output by the AC power supply into DC power, and the power conversion circuit is used to perform power conversion on the DC power output by the power factor correction circuit and charge the power battery.

[0046] The on-board charger circuit includes a power conversion circuit for power conversion, the power conversion circuit includes at least one controllable bridge arm, and the DC conversion circuit reuses one bridge arm in the power conversion circuit. The on-board charger circuit also includes a power factor correction PFC circuit, one end of the PFC circuit is used to connect to an AC power source or an AC load, and the other end of the PFC circuit is used to connect to the power conversion circuit. The PFC circuit is used to convert the AC power input from an external power source into DC power and charge the power battery, or convert the DC power input from the power battery into AC power and power the AC load.

[0047] In combination with the first aspect, in certain implementations of the first aspect, the all-in-one power supply device includes two control chips, one of the two control chips is used to control the operation of the power factor correction circuit, and the other of the two control chips is used to control the operation of the power conversion circuit, the three-phase inverter circuit and the DC conversion circuit, and the two control chips communicate through an isolation chip.

[0048] The shell also includes a control chip, which is used to control the on and off of the switch tube in the all-in-one power supply device.

[0049] In a possible configuration, the PFC circuit of the on-board charger circuit is controlled by a digital signal processor DSP, and the remaining power circuit, three-phase inverter circuit, and DC conversion circuit of the on-board charger circuit can be controlled by another digital signal processor DSP. Necessary information is transmitted between the two digital signal processors via an isolation chip.

[0050] In another possible configuration, the PFC circuit and three-phase inverter circuit of the on-board charger circuit are controlled by a digital signal processor DSP, and the remaining power circuit and DC conversion circuit of the on-board charger circuit can be controlled by another digital signal processor DSP. Necessary information is transmitted between the two digital signal processors via an isolation chip.

[0051] According to the solution of the present application, the same control chip is used to control the DC conversion circuit and part of the on-board charger circuit, which has high resource utilization and reduces the cost of the entire control architecture.

[0052] In a second aspect, the present application provides a power assembly, which includes a drive motor and an all-in-one power supply device in the first aspect and its various implementations.

[0053] In a third aspect, the present application provides an electric vehicle, comprising four wheels, a power battery and the powertrain as described in the second aspect, wherein the powertrain is used to receive power from the power battery to drive the four wheels.

[0054] The beneficial effects of other aspects can refer to the beneficial effects described in the first aspect and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 is a schematic diagram of an electric vehicle provided in an embodiment of the present application;

[0056] Figure 2 It is a schematic diagram of an all-in-one assembly provided in an embodiment of the present application;

[0057] Figure 3 is a schematic diagram of the circuit topology of the all-in-one power supply device provided in an embodiment of the present application;

[0058] Figure 4 is a schematic diagram of an all-in-one power supply device provided in an embodiment of the present application;

[0059] Figure 5 This is a connection diagram of an all-in-one power supply device provided in an embodiment of the present application;

[0060] Figure 6 This is a connection diagram of another all-in-one power supply device provided in an embodiment of the present application;

[0061] Figure 7This is a connection diagram of another all-in-one power supply device provided in an embodiment of the present application;

[0062] Figure 8 This is a connection diagram of another all-in-one power supply device provided in an embodiment of the present application;

[0063] Fig. 9 It is a control schematic diagram of an all-in-one power supply device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0064] The following will describe the technical solution in the present application in conjunction with the accompanying drawings. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0065] Figure 1 It is a schematic diagram of the architecture of the electric vehicle 10 provided in an embodiment of the present application.

[0066] like Figure 1 As shown, the electric vehicle 10 includes four wheels, a power battery 20, a powertrain 30 and a low-voltage load 60, wherein the powertrain 30 includes an all-in-one power supply device 40 and a drive motor 50. During the charging process of the electric vehicle 10, the powertrain 30 is used to receive AC power and convert the AC power into DC power to charge the power battery 20. During the driving process of the electric vehicle 10, the powertrain 30 is used to receive DC power from the power battery 20 and power the drive motor 50 to drive the four wheels. The drive motor 50 includes a stator winding and a rotor, and the output torque of the drive motor 50 is controlled by outputting AC power to the three-phase stator winding. The drive motor 50 can also enter the feedback working state. When the rotor speed of the drive motor 50 exceeds the rotation speed of the synchronous magnetic field of the drive motor 50, the direction of the rotor cutting the magnetic field lines is reversed, and the electromagnetic torque generated by the rotor is opposite to the rotation direction of the rotor. The drive motor 50 is in a braking state and generates AC power.

[0067] The low voltage load 60 is an electrical device in the electric vehicle 10, which may be one or more low voltage devices in the power system, control system, sensor system, switch system, multimedia system, lighting system, safety system, micro-motor system and related accessory systems, such as low voltage batteries, electric windows, interior lighting, cigarette lighters, brake lights, ignition sparks, air conditioners, driver assistance systems, infotainment systems, etc.

[0068] The electric vehicle 10 in the embodiment of the present application can be any one of different types of vehicles such as a car, a truck, a passenger bus, etc., and can also be a transport device for carrying people or goods such as a tricycle, a two-wheeled vehicle, a train, or other types of vehicles driven by power batteries, which are not limited in the embodiment of the present application. Among them, the electric vehicle 10 includes but is not limited to pure electric vehicles (pure electric vehicle / battery electric vehicle, pure EV / batteryEV), hybrid electric vehicles (hybrid electric vehicle, HEV), range extended electric vehicles (range extended electric vehicle, REEV), plug-in hybrid electric vehicles (plug in hybrid electric vehicle, PHEV), new energy vehicles (new energy vehicle, NEV), etc.

[0069] Figure 2 This is a schematic diagram of the power supply architecture of an all-in-one power supply device, which integrates an on-board charger (OBC), a DC / DC converter (DCDC) and a motor control unit (MCU). The all-in-one product is controlled by a digital signal processor (DSP). DSP1 controls the OBC circuit and the power battery, DSP2 controls the MCU circuit and the drive motor, and DSP3 controls the DCDC circuit and the low-voltage battery. The all-in-one power supply device simply integrates multiple components together, and integrates the controllers and structures of the OBC, DCDC and MCU that were originally controlled by independent controllers. There is no deep integration in the power topology, and the cost is still relatively high.

[0070] Figure 3 Schematic diagram of the circuit topology of an all-in-one power supply device. Figure 3As shown, the all-in-one power supply device 40 includes an on-board charger circuit 43 and a three-phase inverter circuit 44, wherein the on-board charger circuit 43 is used to receive power from an AC power source and charge the power battery 20, and the three-phase inverter circuit 44 is used to receive power from the power battery 20 and power the drive motor 50. In one embodiment, the all-in-one power supply device 40 also includes a three-phase inverter circuit 45 and a PTC power circuit 46. The three-phase inverter circuit 45 is a compressor drive circuit, which is used to drive the air-conditioning compressor of the electric vehicle 10, and the PTC power circuit 46 is used to power the thermistor (positive temperature coefficient, PTC). In one embodiment, the all-in-one power supply device 40 also includes a DC conversion circuit 42, which is used to step down the DC power output by the power battery 20 to power the low-voltage load 60.

[0071] based on Figure 3 The circuit topology of the all-in-one power supply device shown in the figure, the embodiment of the present application further provides an all-in-one power supply device, a powertrain and an electric vehicle that realize bridge arm reuse, and reuses the bridge arms of other existing circuits as the bridge arms of DCDC, which can effectively improve the integration of the all-in-one power supply device and reduce costs.

[0072] Figure 4 An all-in-one power supply device 40 is provided in an embodiment of the present application. The all-in-one power supply device 40 includes a shell 41, which is used to accommodate two circuit boards. The two circuit boards are stacked in the shell.

[0073] In one embodiment, the all-in-one power supply device 40 includes two circuit boards, one of the two circuit boards is used to carry electrical components of the vehicle charger circuit 43, the primary bridge arm 421 and the transformer 422, and the other of the two circuit boards is used to carry electrical components of the secondary circuit 423.

[0074] In one embodiment, one of the two circuit boards is also used to carry electrical components of the three-phase inverter circuit 44 .

[0075] In one embodiment, the housing 41 further includes a power battery interface for connecting the power battery 20 of the electric vehicle 10, an external interface for connecting an AC load or an AC power source, and a load interface for connecting a low-voltage load 60. The all-in-one power supply device 40 is used to receive AC power provided by the AC power source or to supply power to the AC load through the external interface, and the all-in-one power supply device 40 is also used to charge the power battery 20 or receive power from the power battery 20 through the power battery interface.

[0076] Figures 5 to 8 A circuit topology and control schematic diagram of the all-in-one power supply device 40 provided in an embodiment of the present application.

[0077] See also Figures 5 to 8 , the DC conversion circuit 42 includes a primary bridge arm 421, a transformer 422, a switch unit 424 and a secondary circuit 423. Among them, one end of the primary winding of the transformer 422 is used to connect the midpoint of the bridge arm of the primary bridge arm 421, and the other end of the primary winding is used to selectively conduct the midpoint of the bridge arm of one of the bridge arms connected to other circuits through the switch unit 424. The secondary winding of the transformer 422 is used to supply power to the secondary circuit 423, and the secondary circuit 423 is used to supply power to the low-voltage load 60. In the embodiment of the present application, the other circuits are any one of the on-board charger circuit 43, the three-phase inverter circuit 44, the three-phase inverter circuit 45, the PTC power circuit 46, or other circuits of the electric vehicle 10. Among them, Figure 5 The other circuits are the on-board charger circuit 43, Figure 6 The other circuits are three-phase inverter circuits 44, Figure 7 and Figure 8 The other circuit is an on-board charger circuit 43 or one of the three-phase inverter circuits 44 , and the other end of the primary winding is used to selectively turn on one of the on-board charger circuit 43 or the three-phase inverter circuit 44 through a switch unit 424 .

[0078] See also Fig. 9 The all-in-one power supply device 40 includes two control chips, one of the two control chips is used to control the operation of the power factor correction circuit, and the other of the two control chips is used to control the operation of the power conversion circuit, the three-phase inverter circuit 45 and the DC conversion circuit 42. The two control chips communicate through an isolation chip.

[0079] The control chip is used to control the on and off of the switch tube in the all-in-one power supply device 40 .

[0080] In a possible configuration, the PFC circuit of the onboard charger circuit 43 is controlled by a digital signal processor DSP, and the remaining power circuits, the three-phase inverter circuit 44, and the DC conversion circuit 42 of the onboard charger circuit 43 can be controlled by another digital signal processor DSP. Necessary information is transmitted between the two digital signal processors via an isolation chip.

[0081] In another possible configuration, the PFC circuit and the three-phase inverter circuit 44 of the onboard charger circuit 43 are controlled by a digital signal processor DSP, and the remaining power circuits and the DC conversion circuit 42 of the onboard charger circuit 43 can be controlled by another digital signal processor DSP. Necessary information is transmitted between the two digital signal processors via an isolation chip.

[0082] According to the solution of the present application, the same control chip is used to control the DC conversion circuit 42 and part of the on-board charger circuit 43, which has high resource utilization and reduces the cost of the entire control architecture.

[0083] In one embodiment, the switch unit 424 is a single-pole double-throw switch, the common contact of the single-pole double-throw switch is used to connect the other end of the primary winding, and the two contacts of the single-pole double-throw switch are respectively used to connect the midpoint of a bridge arm of the vehicle charger circuit 43 and the midpoint of a bridge arm of the three-phase inverter circuit 44.

[0084] In one embodiment, if Figure 7 As shown, the primary bridge arm 421 includes a first capacitor C1 and a second capacitor C2 connected in series. When the other end of the primary winding is used to conduct the midpoint of a bridge arm connected to another circuit through the switch unit 424, one of the bridge arms of the other circuit and the primary bridge arm 421 form a hard-switched half-bridge circuit, and the first capacitor C1 and the second capacitor C2 connected in series in the primary bridge arm 421 form a half-bridge capacitor.

[0085] Exemplarily, the primary topology of the transformer 422 in the DC conversion circuit 42 is a hard-switched half-bridge circuit, and the first capacitor C1 and the second capacitor C2 connected in series in the primary bridge arm 421 form a half-bridge capacitor. The other end of the primary winding is used to conduct the midpoint of the bridge arm of one of the two bridge arms in the power conversion circuit 432 of the on-board charger circuit 43 through the switch unit 424, and the power conversion circuit 432 of the on-board charger circuit 43 is composed of switch tubes Q1 and Q2, switch tubes Q3 and Q4. The other end of the primary winding is used to conduct the midpoint of the bridge arm of one of the three bridge arms of the three-phase inverter circuit 44 through the switch unit 424, and the three-phase inverter circuit 44 is composed of switch tubes Q5 and Q6, switch tubes Q7 and Q8, switch tubes Q9 and Q10. The switch bridge arm of the primary bridge arm 421 reuses the bridge arm composed of switch tube Q3 and switch tube Q4 in the power conversion circuit 432 in the vehicle charger circuit 43, or the bridge arm composed of switch tube Q5 and switch tube Q6 in one of the three-phase inverter circuits 44.

[0086] In the default state, the A end point of the switch unit 424 is connected to the B end point, and the B end point is connected to the midpoint of the bridge arm composed of the switch tube Q3 and the switch tube Q4 in the power conversion circuit 432 in the vehicle charger circuit 43. When the vehicle is parked for slow charging or when the vehicle is parked for discharging, the A end point of the switch unit 424 is connected to the C end point, and the C end point is connected to the midpoint of the bridge arm composed of the switch tube Q5 and the switch tube Q6 in the three-phase inverter circuit 44.

[0087] In one embodiment, if Figure 8 As shown, the primary bridge arm 421 includes two switch tubes connected in series.

[0088] Exemplarily, the primary side topology of the transformer 422 in the DC conversion circuit 42 is a hard-switching half-bridge circuit, and the switch tubes Q11 and Q12 connected in series in a primary side bridge arm 421, the bridge arm composed of the switch tubes Q3 and Q4 in the power conversion circuit 432 in the on-board charger circuit 43, or the bridge arm composed of the switch tubes Q5 and Q6 in one of the three-phase inverter circuits 44, constitute a full-bridge bridge arm.

[0089] In the default state, the A end point of the switch unit 424 is connected to the B end point, and the B end point is connected to the midpoint of the bridge arm composed of the switch tube Q3 and the switch tube Q4 in the power conversion circuit 432 in the vehicle charger circuit 43, and the switch tubes Q3, Q4, Q11 and Q12 form a full bridge arm. When the vehicle is parked for slow charging or when the vehicle is parked for discharging, the A end point of the switch unit 424 is connected to the C end point, and the C end point is connected to the midpoint of the bridge arm composed of the switch tube Q5 and the switch tube Q6 in the three-phase inverter circuit 44, and the switch tubes Q5, Q6, Q11 and Q12 form a full bridge arm.

[0090] The DC conversion circuit 42 of the all-in-one power supply device 40 in the embodiment of the present application includes only one primary bridge arm, and reuses the bridge arm of the vehicle charger circuit 43 or the three-phase inverter circuit 44 as another bridge arm of the DC conversion circuit 42, thereby improving integration and reducing costs.

[0091] In one embodiment, the all-in-one power supply device 40 also includes a filter circuit 45, which is used to filter the output current or the ripple of the output current of the power battery 20. The on-board charger circuit 43 charges the power battery 20 through the filter circuit 45, and the three-phase inverter circuit 44 and the DC conversion circuit 42 receive power from the power battery 20 through the filter circuit 45.

[0092] The two ends of a bridge arm of the on-board charger circuit 43 are used to be connected to the positive and negative poles of the power battery 20 respectively through the filter circuit 45, the two ends of a bridge arm of the three-phase inverter circuit 44 are used to be connected to the positive and negative poles of the power battery 20 respectively through the filter circuit 45, and the two ends of the primary bridge arm 421 are used to be connected to the positive and negative poles of the power battery 20 respectively through the filter circuit 45.

[0093] Exemplarily, the filter circuit 45 is composed of an MCU DC-link capacitor and a π-type filter.

[0094] The on-board charger circuit 43, the three-phase inverter circuit 44 and the DC conversion circuit 42 are all connected to the power battery 20 through the filter circuit 45. The DC conversion circuit 42 converts the high-voltage DC voltage output by the power battery 20 into a low-voltage DC voltage to supply power to the low-voltage load, and also converts the low-voltage DC output by the low-voltage battery into a high-voltage DC voltage to pre-charge the capacitor in the filter circuit 45.

[0095] According to the solution of the present application, the vehicle charger, the motor controller and the DC conversion circuit 42 share the filter circuit 45, which reduces the influence of the filter and further reduces the cost.

[0096] Figure 5 An all-in-one power supply device 40 for realizing bridge arm multiplexing is provided in an embodiment of the present application. Figure 5 As shown, the all-in-one power supply device 40 includes an on-board charger circuit 43 and a DC conversion circuit 42 .

[0097] The all-in-one power supply device 40 is used to receive AC power supply through the on-board charger circuit 43 to charge the power battery 20, or to convert the DC power output by the power battery 20 into AC power to power the AC load through the on-board charger circuit 43. The on-board charger circuit 43 includes a power factor correction circuit 431 and a power conversion circuit 432. The power factor correction circuit 431 is used to convert the AC power output by the external power supply into DC power, and the power conversion circuit 432 is used to perform power conversion on the DC power output by the power factor correction circuit 431 and power the power battery 20.

[0098] See also Figure 5 In the circuit topology, the on-board charger circuit 43 includes a power conversion circuit 432 for power conversion, the power conversion circuit 432 includes at least one controllable bridge arm, and the DC conversion circuit 42 reuses one bridge arm of the power conversion circuit 432. In the process of the all-in-one power supply device 40 being used to supply power to the power battery 20, the switch unit 424 disconnects the connection between the other end of the primary winding of the transformer 422 and the midpoint of one bridge arm of the on-board charger circuit 43, and the on-board charger circuit 43 is used to supply power to the power battery 20. In the process of the all-in-one power supply device 40 being used to supply power to the low-voltage load 60, the switch unit 424 connects the other end of the primary winding of the transformer 422 and the midpoint of one bridge arm of the on-board charger circuit 43, and the primary bridge arm 421 and one bridge arm of the on-board charger circuit 43 are used to receive power from the power battery 20 and supply power to the primary winding of the transformer 422.

[0099] When the all-in-one power supply device 40 is supplying power to the power battery, the on-board charger circuit 43 needs to use a reused bridge arm for circuit control. At this time, the switch unit 424 disconnects the connection between the other end of the primary winding of the transformer 422 and the midpoint of the bridge arm 431 of the on-board charger circuit 43. The DC conversion circuit 42 does not use a reused bridge arm of the on-board charger circuit 43 at this time. The on-board charger circuit 43 is used to supply power to the power battery 20.

[0100] When the all-in-one power supply device 40 is used to supply power to the low-voltage load 60, the on-board charger circuit 43 does not need to use a reused bridge arm. At this time, the switch unit 424 connects the other end of the primary winding of the transformer 422 with the midpoint of the bridge arm of one bridge arm of the on-board charger circuit 43. The DC conversion circuit 42 uses the primary bridge arm 421 and the reused bridge arm 431 of the on-board charger circuit 43 to receive power and supply power to the primary winding of the transformer 422.

[0101] The primary bridge arm 421 is always connected to one end of the primary winding, and the midpoint of a bridge arm of the vehicle-mounted charger circuit 43 is connected to the other end of the primary winding through a switch unit 424. The switch unit 424 controls the conduction and disconnection of the midpoint of a bridge arm of the vehicle-mounted charger circuit 43 and the primary winding, thereby avoiding conflicts with the vehicle-mounted charger circuit 43 during operation.

[0102] According to the solution of the present application, a bridge arm of the on-board charger circuit 43 is reused as the bridge arm of the primary winding of the DC conversion circuit 42, thereby improving the integration of the all-in-one power supply device and reducing the cost.

[0103] Figure 6 Another all-in-one power supply device 40 for realizing bridge arm multiplexing is provided in the embodiment of the present application. Figure 6 As shown, the three-phase inverter circuit 44 is used to convert the direct current output by the power battery 20 into three-phase alternating current to power the drive motor 50 of the electric vehicle.

[0104] See also Figure 6In the circuit topology, the three-phase inverter circuit 44 includes three-phase bridge arms, and the midpoint of each bridge arm is used to connect the three-phase winding of the stator of the drive motor 50, and the DC conversion circuit 42 reuses any one of the bridge arms of the three-phase inverter circuit 44. In the process of the multi-in-one power supply device 40 being used to power the drive motor 50, the switch unit 424 disconnects the connection between the other end of the primary winding of the transformer 422 and the midpoint of the bridge arm of the bridge arm of the three-phase inverter circuit 44, and the three-phase inverter circuit 44 is used to power the drive motor 50. In the process of the multi-in-one power supply device 40 being used to power the low-voltage load 60, the switch unit 424 connects the other end of the primary winding of the transformer 422 and the midpoint of the bridge arm of one of the bridge arms of the three-phase inverter circuit 44, and the primary bridge arm 421 and one of the bridge arms of the three-phase inverter circuit 44 are used to receive power from the power battery 20 and supply power to the primary winding of the transformer 422.

[0105] When the all-in-one power supply device 40 is supplying power to the drive motor 50, the three-phase inverter circuit 44 needs to use a reused bridge arm for circuit control. At this time, the switch unit 424 disconnects the connection between the other end of the primary winding of the transformer 422 and the midpoint of the bridge arm 431 of the on-board charger circuit 43. The DC conversion circuit 42 does not use one bridge arm of the reused three-phase inverter circuit 44 at this time, and the three-phase inverter circuit 44 is used to supply power to the drive motor 50.

[0106] When the all-in-one power supply device 40 is used to supply power to the low-voltage load 60, the three-phase inverter circuit 44 does not need to use a reused bridge arm. At this time, the switch unit 424 connects the other end of the primary winding of the transformer 422 with the midpoint of the bridge arm of one bridge arm of the three-phase inverter circuit 44, and the DC conversion circuit 42 uses the primary bridge arm 421 and the reused bridge arm of the three-phase inverter circuit 44 to receive power and supply power to the primary winding of the transformer 422.

[0107] The primary bridge arm 421 is always connected to one end of the primary winding, and the midpoint of a bridge arm of the three-phase inverter circuit 44 is connected to the other end of the primary winding through the switch unit 424. The switch unit 424 controls the conduction and disconnection of the midpoint of a bridge arm of the three-phase inverter circuit 44 and the primary winding, thereby avoiding conflicts with the three-phase inverter circuit 44 during operation.

[0108] According to the solution of the present application, a bridge arm of the vehicle-mounted three-phase inverter circuit 44 is reused as the bridge arm of the primary winding of the DC conversion circuit 42, thereby improving the integration of the all-in-one power supply device and reducing the cost.

[0109] Figure 7 Another all-in-one power supply device 40 for realizing bridge arm multiplexing is provided in the embodiment of the present application. Figure 7As shown, the all-in-one power supply device 40 includes an on-board charger circuit 43, a three-phase inverter circuit 44, and a DC conversion circuit 42. One end of the primary winding of the DC conversion circuit 42 is used to connect the bridge arm midpoint of the primary bridge arm, and the other end of the primary winding is used to selectively connect the on-board charger circuit 43 or the bridge arm midpoint of one of the bridge arms of the three-phase inverter circuit 44 through a switch unit. The secondary winding of the transformer is used to supply power to the secondary circuit, and the secondary circuit is used to supply power to the low-voltage load 60.

[0110] Since the on-board charger circuit 43 needs to charge the power battery 20, one of the bridge arms in the on-board charger circuit 43 works when supplying power to the power battery 20, and cannot be used as a bridge arm when the DC conversion circuit 42 performs step-down conversion. The three-phase inverter circuit 44 needs to supply power to the drive motor 50, and one of the bridge arms in the three-phase inverter circuit 44 works when supplying power to the drive motor 50, and cannot be used as a bridge arm when the DC conversion circuit 42 performs step-down conversion. Therefore, the other end of the primary winding is selectively connected to the midpoint of the bridge arm of the on-board charger circuit 43 or one of the bridge arms of the three-phase inverter circuit 44 through the switch unit 424, thereby avoiding conflicts between the on-board charger circuit 43 and the three-phase inverter circuit 44 during normal operation.

[0111] In one embodiment, when the on-board charger circuit 43 is used to charge the power battery 20, the switch unit 424 disconnects the connection between the midpoint of one bridge arm of the on-board charger circuit 43 and the other end of the primary winding and connects the connection between the midpoint of one bridge arm of the three-phase inverter circuit 44 and the other end of the primary winding. One bridge arm of the three-phase inverter circuit 44 and the primary bridge arm 421 are used to supply power to the primary winding.

[0112] The on-board charger circuit 43 is used to receive power from an external power source and convert the AC power provided by the external power source into DC power to charge the power battery 20. In the process of charging the power battery, the on-board charger circuit 43 needs to use all bridge arms for circuit control, so any bridge arm cannot be reused as a bridge arm of the primary side of the DC conversion circuit 42. At this time, the switch unit 424 turns off the connection between the other end of the primary winding of the transformer 422 and the midpoint of the bridge arm of one of the bridge arms of the on-board charger circuit 43. At the same time, in the process of charging the power battery 20 by the on-board charger circuit 43, the three-phase inverter circuit 44 does not need to supply power to the drive motor, the bridge arm of the three-phase inverter circuit 44 is reused, and the switch unit 424 turns on the connection between the midpoint of the bridge arm of one of the bridge arms of the three-phase inverter circuit 44 and the other end of the primary winding.

[0113] In one embodiment, the on-board charger circuit 43 is also used to convert the DC power output by the power battery 20 into AC power to power the AC load; in the process of the on-board charger circuit 43 powering the AC load, the switch unit 424 disconnects the connection between the midpoint of one bridge arm of the on-board charger circuit 43 and the other end of the primary winding and connects the connection between the midpoint of one bridge arm of the three-phase inverter circuit 44 and the other end of the primary winding.

[0114] The on-board charger circuit 43 is also used to receive power from the power battery and convert the DC power output by the power battery 20 into AC power to power the AC load. In the process of supplying power to the AC load, the on-board charger circuit 43 needs to use all bridge arms for circuit control, so any bridge arm cannot be reused as a bridge arm of the primary side of the DC conversion circuit 42. At this time, the switch unit 424 disconnects the connection between the other end of the primary winding of the transformer 422 and the midpoint of the bridge arm of one of the bridge arms of the on-board charger circuit 43. At the same time, in the process of supplying power to the AC load, the three-phase inverter circuit 44 does not need to supply power to the drive motor, the bridge arm of the three-phase inverter circuit 44 is reused, and the switch unit 424 conducts the connection between the midpoint of the bridge arm of one of the bridge arms of the three-phase inverter circuit 44 and the other end of the primary winding.

[0115] In one embodiment, when the three-phase inverter circuit 44 is used to power the drive motor 50, the switch unit 424 turns on the connection between the midpoint of one bridge arm of the on-board charger circuit 43 and the other end of the primary winding and disconnects the connection between the midpoint of one bridge arm of the three-phase inverter circuit 44 and the other end of the primary winding. One bridge arm of the on-board charger circuit 43 and the primary bridge arm 421 are used to power the primary winding.

[0116] The three-phase inverter circuit 44 is used to receive power from the power battery 20 and convert the DC power provided by the power battery 20 into AC power to power the drive motor 50. The three-phase inverter circuit 44 includes three-phase bridge arms, and the midpoint of each bridge arm is used to connect the three-phase winding of the stator of the drive motor 50, and the DC conversion circuit 42 reuses any bridge arm in the three-phase inverter circuit 44. In the process of supplying power to the drive motor 50, the three-phase inverter circuit 44 needs to use all bridge arms for circuit control, so any bridge arm cannot be reused as a bridge arm of the primary side of the DC conversion circuit 42. At this time, the switch unit 424 shuts off the connection between the other end of the primary winding of the transformer 422 and the midpoint of the bridge arm of a bridge arm of the three-phase inverter circuit 44. At the same time, when the three-phase inverter circuit 44 is supplying power to the drive motor 50, the on-board charger circuit 43 does not need to supply power to the power battery 20, the bridge arm of the on-board charger circuit 43 is reused, and the switch unit 424 turns on the connection between the midpoint of one bridge arm of the on-board charger circuit 43 and the other end of the primary winding.

[0117] The three-phase inverter circuit 44 is also used to receive the AC power generated by the drive motor 50, and convert the AC power generated by the drive motor 50 into DC power to charge the power battery 20. In the process of receiving the AC power generated by the drive motor 50, the three-phase inverter circuit 44 needs to use all bridge arms for circuit control, so any bridge arm cannot be reused as a bridge arm of the primary side of the DC conversion circuit 42. At this time, the switch unit 424 turns off the connection between the other end of the primary winding of the transformer 422 and the bridge arm midpoint of one bridge arm of the vehicle three-phase inverter circuit 44. At the same time, in the process of receiving the AC power generated by the drive motor 50, the on-board charger circuit 43 does not need to supply power to the power battery 20, the bridge arm of the on-board charger circuit 43 is reused, and the switch unit 424 conducts the connection between the bridge arm midpoint of one bridge arm of the on-board charger circuit 43 and the other end of the primary winding.

[0118] The on-board charger circuit 43 is used to charge the power battery 20, and the three-phase inverter circuit 44 is used to power the drive motor 50. The power battery 20 and the drive motor 50 do not need to be powered at the same time. Therefore, the DC conversion circuit 42 reuses one bridge arm of the on-board charger circuit 43 or one bridge arm of the three-phase inverter circuit 44 to fully utilize the working time of the on-board charger circuit 43 and the three-phase inverter circuit 44.

[0119] According to the solution of the present application, the connection between the bridge arm of the reused on-board charger circuit 43 or the three-phase inverter circuit 44 and the primary winding is controlled by the on and off control of the switch unit 424, thereby avoiding the inability to use the DC conversion circuit 42 when the three-phase inverter circuit 44 is working, thereby improving availability and reducing costs.

[0120] Through the solution of the present application, by utilizing the characteristics of the working time of the on-board charger and the motor controller, the DC conversion circuit 42 is only provided with one primary bridge arm, and one bridge arm in the on-board charger circuit 43 or the three-phase inverter circuit 44 is reused, thereby reducing the number of devices, improving the integration of the all-in-one power supply device, and reducing the cost.

[0121] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An all-in-one power supply device for realizing bridge arm multiplexing, characterized in that: The all-in-one power supply device includes an on-board charger circuit, a three-phase inverter circuit and a DC conversion circuit. The on-board charger circuit is used to receive AC power supply and charge the power battery of the electric vehicle. The three-phase inverter circuit is used to receive power from the power battery and power the drive motor or compressor of the electric vehicle. The DC conversion circuit is used to step down the DC power output by the power battery to power a low-voltage load. The DC conversion circuit includes a primary bridge arm, a transformer, a switch unit and a secondary circuit, wherein: One end of the primary winding of the transformer is used to connect to the midpoint of the primary bridge arm, and the other end of the primary winding is used to selectively connect to the on-board charger circuit or the midpoint of one of the bridge arms of the three-phase inverter circuit through the switch unit. The secondary winding of the transformer is used to supply power to the secondary circuit, and the secondary circuit is used to supply power to the low-voltage load.

2. The all-in-one power supply device according to claim 1, characterized in that: When the on-board charger circuit is used to charge the power battery, the switch unit disconnects the connection between the midpoint of one bridge arm of the on-board charger circuit and the other end of the primary winding and connects the connection between the midpoint of one bridge arm of the three-phase inverter circuit and the other end of the primary winding. One bridge arm of the three-phase inverter circuit and the primary bridge arm are used to supply power to the primary winding.

3. The all-in-one power supply device according to claim 1 or 2, characterized in that: The on-board charger circuit is also used to convert the direct current output by the power battery into alternating current to supply power to the AC load; During the process of the on-board charger circuit supplying power to the AC load, the switch unit disconnects the connection between the midpoint of one bridge arm of the on-board charger circuit and the other end of the primary winding and connects the connection between the midpoint of one bridge arm of the three-phase inverter circuit and the other end of the primary winding.

4. The all-in-one power supply device according to any one of claims 1 to 3, characterized in that: During the process of the three-phase inverter circuit being used to power the drive motor, the switch unit turns on the connection between the midpoint of a bridge arm of the on-board charger circuit and the other end of the primary winding and disconnects the connection between the midpoint of a bridge arm of the three-phase inverter circuit and the other end of the primary winding. One bridge arm of the on-board charger circuit and the primary bridge arm are used to power the primary winding.

5. The all-in-one power supply device according to any one of claims 1 to 4, characterized in that: The all-in-one power supply device includes two circuit boards, one of the two circuit boards is used to carry the on-board charger circuit, the primary bridge arm and the electrical components of the transformer, and the other of the two circuit boards is used to carry the electrical components of the secondary circuit.

6. The all-in-one power supply device according to claim 5, characterized in that: One of the two circuit boards is also used to carry electrical components of the three-phase inverter circuit.

7. The all-in-one power supply device according to claim 5 or 6, characterized in that: The all-in-one power supply device also includes a shell, which is used to accommodate the two circuit boards, and the two circuit boards are stacked in the shell.

8. The all-in-one power supply device according to any one of claims 1 to 7, characterized in that: The primary bridge arm includes a first capacitor and a second capacitor connected in series.

9. The all-in-one power supply device according to any one of claims 1 to 7, characterized in that: The primary bridge arm includes two switch tubes connected in series.

10. The all-in-one power supply device according to any one of claims 1 to 9, characterized in that: The switch unit is a single-pole double-throw switch, the common contact of the single-pole double-throw switch is used to connect the other end of the primary winding, and the two contacts of the single-pole double-throw switch are respectively used to connect the midpoint of a bridge arm of the on-board charger circuit and the midpoint of a bridge arm of the three-phase inverter circuit.

11. The all-in-one power supply device according to any one of claims 1 to 10, characterized in that: The all-in-one power supply device also includes a filter circuit, which is used to filter the output current or the ripple of the output current of the power battery. The on-board charger circuit charges the power battery through the filter circuit, and the three-phase inverter circuit and the DC conversion circuit receive power from the power battery through the filter circuit.

12. The all-in-one power supply device according to any one of claims 1 to 11, characterized in that: The on-board charger circuit includes a power factor correction circuit and a power conversion circuit. The power factor correction circuit is used to convert the AC power output by the AC power supply into DC power, and the power conversion circuit is used to perform power conversion on the DC power output by the power factor correction circuit and charge the power battery.

13. The all-in-one power supply device according to claim 12, characterized in that: The all-in-one power supply device includes two control chips, one of the two control chips is used to control the operation of the power factor correction circuit, and the other of the two control chips is used to control the operation of the power conversion circuit, the three-phase inverter circuit and the DC conversion circuit. The two control chips communicate with each other through an isolation chip.

14. A powertrain, characterized in that: The power assembly includes a drive motor and an all-in-one power supply device according to any one of claims 1 to 13, wherein the all-in-one power supply device is used to receive power from a power battery to drive the drive motor.

15. An electric vehicle, characterized in that: The electric vehicle comprises four wheels, a power battery and the powertrain as claimed in claim 14, wherein the powertrain is used to receive power from the power battery to drive the four wheels.

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