All-in-one power supply device for electric vehicle and electric vehicle

Abstract

According to the all-in-one power supply device for the electric vehicle and the electric vehicle, when a power battery is charged, alternating current is converted into direct current through a power factor correction circuit, the direct current is boosted through a second power conversion circuit and then charged for the power battery, and when power is supplied to a low-voltage load or a low-voltage storage battery, the direct current is boosted through a second power conversion circuit; the vehicle-mounted charging circuit receives the high-voltage direct current of the power battery and supplies power to the power battery after voltage reduction conversion, the all-in-one power supply device further comprises a first power conversion circuit, and the first power conversion circuit supplies power to the low-voltage load or the low-voltage storage battery through the first low-voltage direct current interface after voltage reduction of the high-voltage direct current of the power battery. A double-circuit low-voltage power supply structure can be provided for the interior of an automobile, and a vehicle-mounted charging circuit is reused, so that the size and the cost of the whole power supply circuit are reduced.

Description

Technical Field

[0001] The present application relates to the field of electric vehicle control, and in particular to an all-in-one power supply device for an electric vehicle and an electric vehicle. Background Art

[0002] With the development of electric vehicles, the number of various loads and equipment continues to increase, resulting in a growing demand for low-voltage power supply inside the car. Due to the needs of autonomous driving and driving safety, the reliability of low-voltage power supply is very high. Therefore, the low-voltage power supply in the current vehicle is not only provided by a low-voltage battery, but also by a power battery through a direct current-direct current (DC-DC) converter. In addition, in order to meet higher functional safety standards, it is necessary to use a dual-bus low-voltage power supply for the low-voltage load inside the car, thereby providing a redundant path to ensure that the operation of critical systems can be maintained in the event of a single point failure.

[0003] At present, the industry uses two independent DC-DCs to achieve dual-circuit power supply, that is, one converter is responsible for one low-voltage power supply, and the other converter is responsible for the other low-voltage power supply. Although this method can meet the redundancy and reliability requirements to a certain extent, it will also increase the size and cost of the entire power supply circuit.

[0004] In view of this, a solution is needed to provide a dual-path low-voltage power supply architecture inside the car while reducing the size and cost of the entire power supply circuit. Summary of the invention

[0005] The present application provides an all-in-one power supply device for electric vehicles and an electric vehicle. When charging a power battery, alternating current is converted into direct current through a power factor correction circuit, and a second power conversion circuit boosts the alternating current to charge the power battery. When supplying power to a low-voltage load or a low-voltage battery, an on-board charging circuit receives the high-voltage direct current of the power battery, performs a voltage reduction conversion, and supplies power to the low-voltage load or the low-voltage battery. In addition, the all-in-one power supply device also includes a first power conversion circuit, which reduces the high-voltage direct current of the power battery and supplies power to the low-voltage load or the low-voltage battery through a first low-voltage direct current interface. In this way, a dual-path low-voltage power supply architecture can be provided for the interior of the vehicle, thereby reducing the volume and cost of the entire power supply circuit.

[0006] In a first aspect, the present application discloses an all-in-one power supply device for an electric vehicle, the all-in-one power supply device comprising: a shell, the shell comprising an AC interface, a high-voltage DC interface, and a first low-voltage DC interface, the AC interface is used to connect to an AC charging pile, the high-voltage DC interface is used to connect to a power battery, the first low-voltage DC interface is used to connect to a low-voltage load and a low-voltage battery, a first power conversion circuit, the first power conversion circuit is used to step down the high-voltage DC output of the power battery and then power the low-voltage load or the low-voltage battery through the first low-voltage DC interface, an on-board charging circuit, the on-board charging circuit comprising a power factor correction circuit and a second power conversion circuit, the on-board charging circuit is used to charge the power battery Electricity, or, the on-board charging circuit is used to power a low-voltage load or a low-voltage battery, wherein, when the on-board charging circuit is used to charge the power battery, the power factor correction circuit is used to receive the AC power output by the AC charging pile through the AC interface and convert the AC power into DC power, and the second power conversion circuit is used to boost the DC power output by the power factor correction circuit and charge the power battery through the high-voltage DC interface. When the on-board charging circuit is used to power a low-voltage load or a low-voltage battery, the on-board charging circuit is used to receive the high-voltage DC power output by the power battery through the high-voltage DC interface and down-convert the high-voltage DC power and then power the low-voltage load or the low-voltage battery through the first low-voltage DC interface.

[0007] This application dynamically adjusts the working state of the power factor correction circuit and the second power conversion circuit according to the current working mode (charging or power supply) of the electric vehicle to ensure efficient operation in different application scenarios. By reusing the power factor correction circuit and the first power conversion circuit in the existing on-board charging circuit, and the all-in-one power supply device also includes a first power conversion circuit, the first power conversion circuit steps down the high-voltage direct current of the power battery and supplies power to the low-voltage load or low-voltage battery through the first low-voltage direct current interface. In this way, a dual-path low-voltage power supply architecture can be provided for the interior of the car, thereby reducing the volume and cost of the entire power supply circuit.

[0008] As a possible implementation, when the on-board charging circuit is used to power a low-voltage load or a low-voltage battery, the second power conversion circuit is used to step down the high-voltage direct current, and the power factor correction circuit is used to step down the direct current output by the second power conversion circuit and power the low-voltage load or the low-voltage battery.

[0009] When supplying power to low-voltage loads or low-voltage batteries, the DC power from the power battery is converted into lower DC power through two main steps: isolation step-down and inverter step-down. The isolation step-down stage is achieved through the second power conversion circuit, while the inverter step-down stage is achieved by controlling the switching devices in the bridge arm through appropriate modulation strategies and synchronous control to achieve further step-down, which not only improves energy utilization efficiency, but also enables the power battery of the electric vehicle to supply power to low-voltage loads or low-voltage batteries when needed.

[0010] As a possible implementation, the all-in-one power supply device also includes an isolating switch, and the power factor correction circuit is used to connect to the first low-voltage DC power interface through the isolating switch. When the on-board charging circuit is used to charge the power battery, the isolating switch is used to disconnect the connection between the power factor correction circuit and the first low-voltage DC power interface. When the on-board charging circuit is used to power a low-voltage load or a low-voltage battery, the isolating switch turns on the connection between the power factor correction circuit and the first low-voltage DC power interface, and the power factor correction circuit is used to power the low-voltage load or the low-voltage battery through the isolating switch.

[0011] By using an isolating switch, the all-in-one power supply device can flexibly switch between different working modes, ensuring efficient and safe operation when charging the power battery and supplying low-voltage loads or low-voltage batteries. The isolating switch realizes electrical isolation and path selection.

[0012] As a possible implementation, the shell also includes a second low-voltage DC power interface, and the first power conversion circuit is used to receive high-voltage DC power and step down the high-voltage DC power to power a low-voltage load or a low-voltage battery through the second low-voltage DC power interface.

[0013] As a possible implementation, the all-in-one power supply device includes a protection circuit, which is used to turn on or off the connection between the first power conversion circuit and the first low-voltage DC power interface. When the first power conversion circuit fails, the protection circuit disconnects the connection between the first power conversion circuit and the first low-voltage DC power interface. The on-board charging circuit is used to power a low-voltage load or a low-voltage battery through the first low-voltage DC power interface.

[0014] By controlling the state of the protection switch, the system can select different energy flow paths. Under normal circumstances, the protection switch remains on, allowing the first power conversion circuit to power the low-voltage load or the low-voltage battery. In the event of a fault, the protection switch is disconnected and switches to the backup path. The on-board charging circuit can continue to power the low-voltage load or the low-voltage battery through the first low-voltage DC interface.

[0015] As a possible implementation mode, the on-board charging circuit is also used to receive high-voltage direct current output by the power battery and invert the high-voltage direct current into alternating current and then output it through the AC interface. During the process of the on-board charging circuit outputting alternating current through the AC interface, the isolating switch is disconnected.

[0016] Through this design, electric vehicles can be used as mobile power sources to provide temporary power support for AC loads, enhancing the reliability and emergency response capabilities of electric vehicles.

[0017] As a possible implementation, the all-in-one power supply device also includes a filtering circuit. When the on-board charging circuit is used to charge the power battery, the power factor correction circuit is used to receive the AC power output by the AC charging pile through the filtering circuit, and the filtering circuit is used to reduce the ripple of the AC power output by the AC charging pile. When the on-board charging circuit is used to power a low-voltage load, the power factor correction circuit is used to output a second low-voltage DC power through the filtering circuit, and the filtering circuit is used to reduce the ripple of the second low-voltage DC power.

[0018] When charging the power battery, the power factor correction circuit receives the AC power from the AC charging pile through the filter circuit. The filter circuit filters the AC power to reduce its ripples, making the input current waveform closer to the ideal sine wave. The filtered AC power is rectified into DC power by the power factor correction circuit and the power factor is improved. When supplying power to low-voltage loads or low-voltage batteries, the filter circuit filters the stepped-down low-voltage DC power to reduce its ripples and ensure the stability of the output voltage.

[0019] As a possible implementation, the all-in-one power supply device includes a first transformer, the first power conversion circuit includes multiple first groups of primary bridge arms and multiple first groups of secondary bridge arms, the two ends of the multiple first groups of primary bridge arms receive the high-voltage direct current output by the power battery, the midpoints of the multiple first groups of primary bridge arms output alternating current to the primary winding of the first transformer, the midpoints of the multiple first groups of secondary bridge arms receive the alternating current generated by the secondary winding of the first transformer, and the two ends of the multiple first groups of secondary bridge arms supply power to a low-voltage load or a low-voltage battery through a first low-voltage direct current interface.

[0020] As a possible implementation, the all-in-one power supply device includes a first DC bus, the power factor correction circuit includes multiple PFC bridge arms, the first DC bus is used to connect the two ends of the bridge arms of the multiple PFC bridge arms, when the on-board charging circuit is used to charge the power battery, the midpoints of the multiple PFC bridge arms receive AC power from the AC charging pile through the AC interface, and the two ends of the multiple PFC bridge arms output high-voltage DC power to the first DC bus, when the on-board charging circuit is used to power a low-voltage load or a low-voltage battery, the multiple PFC bridge arms receive the high-voltage DC power input by the second power conversion circuit through the first DC bus, and after the multiple PFC bridge arms perform voltage reduction conversion on the high-voltage DC power, the midpoints of the multiple PFC bridge arms power the low-voltage load or the low-voltage battery through the first low-voltage DC interface.

[0021] As a possible implementation, the all-in-one power supply device includes a second transformer, the second power conversion circuit includes multiple second groups of primary bridge arms and multiple second groups of secondary bridge arms, the first DC bus is used to connect the two ends of the bridge arms of the multiple second groups of primary bridge arms, the two ends of the bridge arms of the multiple second groups of primary bridge arms receive the high-voltage direct current transmitted by the first DC bus, the midpoints of the bridge arms of the multiple second groups of primary bridge arms output alternating current to the primary winding of the first transformer, the midpoints of the bridge arms of the multiple second groups of secondary bridge arms receive the alternating current generated by the secondary winding of the first transformer, and the two ends of the multiple second groups of secondary bridge arms charge the power battery through the high-voltage direct current interface.

[0022] As a possible implementation, the protection circuit includes two diodes and two connecting switches, the anode of one diode is connected to the first end of the protection circuit, the anode of the other diode is connected to the second end of the protection circuit, the cathode of one diode is connected to the cathode of the other diode, one end of one connecting switch is connected to the first end of the second switch circuit, one end of the other connecting switch is connected to the second end of the second switch circuit, and the other end of one connecting switch is connected to the other end of the other connecting switch. In response to a current passing through any one connecting switch being greater than a preset current, the connecting switch with a current greater than the preset current is disconnected.

[0023] In a second aspect, the present application provides an all-in-one power supply device for an electric vehicle, the all-in-one power supply device comprising: a shell, the shell comprising an AC power interface, a high-voltage DC power interface, and a first low-voltage DC power interface, the AC power interface is used to connect to an AC charging pile, the high-voltage DC interface is used to connect to a power battery, the first low-voltage DC interface is used to connect to a low-voltage load and a low-voltage battery, a first power conversion circuit, the first power conversion circuit is used to step down the high-voltage DC power output by the power battery and then power the low-voltage load or the low-voltage battery through the first low-voltage DC interface, an on-board charging circuit, the on-board charging circuit comprising a power factor correction circuit, a second power conversion circuit and a third power conversion circuit, the on-board charging circuit is used To charge the power battery, or the on-board charging circuit is used to power a low-voltage load or a low-voltage battery, wherein, when the on-board charging circuit is used to charge the power battery, the power factor correction circuit is used to receive the AC power output by the AC charging pile through the AC interface and convert the AC power into DC power, and the second power conversion circuit is used to boost the DC power output by the power factor correction circuit and charge the power battery through the high-voltage DC interface. When the on-board charging circuit is used to power a low-voltage load or a low-voltage battery, the on-board charging circuit is used to receive the high-voltage DC power output by the power battery through the high-voltage DC interface and step down the high-voltage DC power to power the low-voltage load or the low-voltage battery through the first low-voltage DC interface.

[0024] The power factor correction circuit may not have a sufficient voltage-step-down ratio to meet the wide-range conversion requirements from high voltage to low voltage. Therefore, when the on-board charging circuit is used to power a low-voltage load or a low-voltage battery, the second power conversion circuit is used to step down the high-voltage direct current, the power factor correction circuit is used to step down the direct current output by the second power conversion circuit, and the third power conversion circuit is used to step down the direct current output by the power factor correction circuit and power the low-voltage load or the low-voltage battery. Therefore, when the power factor correction circuit and the second power conversion circuit have insufficient voltage ratios, the third power conversion circuit directly steps down the high-voltage direct current to the voltage level required by the low-voltage load or the low-voltage battery. In addition, through multi-stage step-down conversion, the voltage can be gradually reduced to improve the efficiency of power conversion.

[0025] As a possible implementation, when the on-board charging circuit is used to power a low-voltage load or a low-voltage battery, the second power conversion circuit is used to step down the high-voltage direct current, the power factor correction circuit is used to step down the direct current output by the second power conversion circuit, and the third power conversion circuit is used to step down the direct current output by the power factor correction circuit and power the low-voltage load or the low-voltage battery.

[0026] As a possible implementation, the all-in-one power supply device also includes an isolating switch, and the third power conversion circuit is used to connect to the first low-voltage DC power interface through the isolating switch. When the on-board charging circuit is used to charge the power battery, the isolating switch is used to disconnect the connection between the third power conversion circuit and the first low-voltage DC power interface. When the on-board charging circuit is used to power a low-voltage load or a low-voltage battery, the isolating switch circuit conducts the connection between the third power conversion circuit and the first low-voltage DC power interface, and the third power conversion circuit is used to power a low-voltage load or a low-voltage battery through the isolating switch.

[0027] In a third aspect, the present application provides an electric vehicle, the electric vehicle comprising an all-in-one power supply device as in the first aspect, or an all-in-one power supply device as in any one of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of an all-in-one power supply device for an electric vehicle in the present application Figure 1 ;

[0029] Figure 2 Schematic diagram for charging electric vehicles;

[0030] Figure 3 It is a structural schematic diagram of a power factor correction circuit;

[0031] Figure 4 This is a schematic structural diagram of a primary bridge arm of the present application;

[0032] Figure 5 This is a schematic diagram of the structure of a secondary bridge arm of the present application;

[0033] Figure 6 A schematic diagram of an all-in-one power supply device for an electric vehicle in the present application Figure 2 ;

[0034] Figure 7 A schematic diagram of an all-in-one power supply device for an electric vehicle in the present application Figure 3 ;

[0035] Figure 8 A schematic diagram of an all-in-one power supply device for an electric vehicle in the present application Figure 4 ;

[0036] Fig. 9 It is a schematic diagram of the structure of the protection circuit;

[0037] Fig.10 A schematic diagram of an all-in-one power supply device for an electric vehicle in the present application Figure 4 ;

[0038] Fig.11This is a schematic diagram of another all-in-one power supply device for electric vehicles according to the present application. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. The specific operating method in the method embodiment can also be applied to the device embodiment or the system embodiment. It should be noted that in the description of the present application, "at least one" refers to one or more, wherein multiple refers to two or more. In view of this, "multiple" can also be understood as "at least two" in the embodiment of the present invention. "And / or" describes the association relationship of the associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / ", unless otherwise specified, generally indicates that the related objects before and after are in an "or" relationship. In addition, it should be understood that in the description of the present application, words such as "first" and "second" are only used to distinguish the purpose of description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order.

[0040] It should be noted that in the embodiments of the present application, "connection" refers to electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, A and B are connected, which can be either A and B directly connected, or A and B indirectly connected through one or more other electrical components, for example, A and B are connected, or A and C are directly connected, C and B are directly connected, and A and B are connected through C.

[0041] With the rapid development of electric vehicles, the number and types of low-voltage electrical devices in vehicles have increased significantly, including but not limited to sensors, autonomous driving related components, and various safety systems. In order to support these growing power demands and ensure highly reliable low-voltage power supply for key systems such as autonomous driving and driving safety, modern electric vehicles rely not only on traditional low-voltage batteries, but also on power batteries via DC-DC converters (DC-DC converters).

[0042] To meet higher functional safety standards, automakers use a dual-bus low-voltage power supply architecture. This architecture provides two independent low-voltage power supply paths, thereby increasing system redundancy. When one power path fails, the other path can continue to power critical loads, ensuring vehicle safety and reliability.

[0043] Currently, two independent DC-DC converters are usually used to achieve dual low-voltage power supply. Although this method can effectively improve the redundancy and reliability of the system, it also brings problems of increased size and cost. For the automotive industry that pursues lightweight design and cost-effectiveness, this is an urgent problem to be solved.

[0044] An all-in-one power supply device for an electric vehicle provided in an embodiment of the present application is described below with reference to the accompanying drawings.

[0045] Figure 1 A schematic diagram of an all-in-one power supply device for an electric vehicle in the present application Figure 1 The all-in-one power supply device includes a shell 101, an on-board charging circuit 102 accommodated in the shell 101, and a first power conversion circuit 103. The shell 101 includes an AC power interface 104, a high-voltage DC power interface 105, and a first low-voltage DC power interface 106. The AC power interface 104 is used to connect to an AC charging pile 107, the high-voltage DC power interface 105 is used to connect to a power battery 110, and the first low-voltage DC power interface 106 is used to connect to a low-voltage load 108 and a low-voltage battery 109.

[0046] Each interface can conduct electricity, and conduct electricity to the devices or circuits connected at both ends of the connector. Exemplarily, the AC interface 104 can be used to connect to the vehicle charging circuit 102 and the AC charging pile, so that the vehicle charging circuit 102 is connected to the AC charging pile.

[0047] The on-board charging circuit 102 and the first power conversion circuit 103 may include an insulated gate bipolar transistor (IGBT) and its anti-parallel diode, or a metal oxide semiconductor field effect transistor (MOSFET) and other switching devices. The present application does not make too many restrictions on the specific structure inside the switch tube, wherein the on-board charging circuit 102 includes: a power factor correction circuit (power factor correction, PFC) 1021 and a second power conversion circuit 1022.

[0048] See also Figure 2 As shown, Figure 2Schematic diagram of charging an electric vehicle. Electric vehicles can usually be charged through an AC charging pile 107, which mainly includes a power circuit and a charging gun. One end of the power circuit is coupled to the industrial frequency power grid, and the other end is coupled to the charging gun through a cable. The power circuit receives the AC power provided by the industrial frequency power grid and converts the received AC power into charging power compatible with the electric vehicle. Insert the charging gun into the charging socket of the electric vehicle to couple the charging gun with the AC interface 104.

[0049] See also Figure 3 As shown, Figure 3 1 is a schematic diagram of the structure of the power factor correction circuit. The all-in-one power supply device includes a first DC bus, the power factor correction circuit 1021 includes a plurality of PFC bridge arms, the first DC bus is used to connect the two ends of the bridge arms of the plurality of PFC bridge arms,

[0050] The first group of bridge arms includes inductors L1 and L2, and switch tubes S1 to S6. One end of L1 and L2 is connected to the AC charging pile 107, the first electrodes of S1, S3 and S5 and one end of C1 are connected to one side of the first DC bus, the second electrodes of S3 and S5 are connected to the other end of L1 and L2 respectively, the second electrodes of S2, S4 and S6 and the other end of C1 are connected to the other side of the first DC bus, the first electrodes of S4 and S6 are connected to the other end of L1 and L2 respectively, the control electrodes of the switch tubes S1 to S6 are connected to the control circuit, and the control circuit realizes functions such as rectification by controlling the on and off of the switch tubes.

[0051] The control circuit can specifically be a central processing unit (CPU), other general-purpose processors, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0052] As a possible implementation, the all-in-one power supply device includes a first transformer, and the first power conversion circuit 103 includes multiple first groups of primary bridge arms and multiple first groups of secondary bridge arms, the two ends of the multiple first groups of primary bridge arms receive the high-voltage direct current output by the power battery 110, the midpoints of the multiple first groups of primary bridge arms output alternating current to the primary winding of the first transformer, the midpoints of the multiple first groups of secondary bridge arms receive the alternating current generated by the secondary winding of the first transformer, and the two ends of the multiple first groups of secondary bridge arms supply power to the low-voltage load 108 or the low-voltage battery 109 through the first low-voltage direct current interface 106.

[0053] The plurality of first groups of primary bridge arms receive high voltage direct current from the power battery 110, and each first group of primary bridge arms is composed of two switching devices to form a half-bridge structure. These switching devices are alternately turned on and off by PWM control signals to invert direct current into alternating current.

[0054] The midpoints of the multiple first groups of primary bridge arms are connected to the primary winding of the first transformer, and the inverted AC power is transmitted to the secondary winding of the first transformer. The first transformer provides electrical isolation and realizes voltage step-up or step-down through its turns ratio. The primary winding on the first transformer receives the AC power from the primary bridge arm, and the secondary winding on the first transformer generates AC power related to the primary winding, but the voltage is stepped down through the turns ratio of the transformer.

[0055] The midpoints of multiple first-group secondary bridge arms receive AC power from the secondary winding of the transformer. Each first-group secondary bridge arm is also composed of two switching devices. The AC power is rectified into DC power through a PWM control signal. The two ends of the secondary bridge arm supply power to a low-voltage load 108 or a low-voltage battery 109 through a first low-voltage DC power interface 106.

[0056] As a possible implementation, the all-in-one power supply device includes a second transformer, the second power conversion circuit 1022 includes multiple second groups of primary bridge arms and multiple second groups of secondary bridge arms, the first DC bus is used to connect the two ends of the bridge arms of the multiple second groups of primary bridge arms, the two ends of the bridge arms of the multiple second groups of primary bridge arms receive the high-voltage direct current transmitted by the first DC bus, the midpoints of the bridge arms of the multiple second groups of primary bridge arms output alternating current to the primary winding of the first transformer, the midpoints of the bridge arms of the multiple second groups of secondary bridge arms receive the alternating current generated by the secondary winding of the first transformer, and the two ends of the multiple second groups of secondary bridge arms charge the power battery 110 through the high-voltage direct current interface 105.

[0057] The second power conversion circuit 1022 can step down the high-voltage direct current output by the power factor correction circuit 1021, thereby supplying power to the low-voltage load 108 or the low-voltage battery 109. Among them, multiple second groups of primary bridge arms receive the high-voltage direct current from the power factor correction circuit 1021, and each second group of primary bridge arms is composed of two switching devices to form a half-bridge structure. These switching devices are alternately turned on and off through PWM control signals to invert the direct current into alternating current.

[0058] The midpoints of the multiple second groups of primary bridge arms are connected to the primary winding of the second transformer, and the inverted AC power is transmitted to the secondary winding of the second transformer. The second transformer provides electrical isolation and realizes voltage step-up or step-down through its turns ratio. The primary winding on the second transformer receives the AC power from the primary bridge arm, and the secondary winding on the second transformer generates AC power related to the primary winding, but the voltage is stepped down through the turns ratio of the transformer.

[0059] The circuit structure of the first power conversion circuit 103 and the second power conversion circuit 1022 is an isolated DC-DC converter circuit. For example, see Figure 4 As shown, Figure 4 This is a structural schematic diagram of a primary bridge arm of the present application, wherein the first transformer and the second transformer may include a primary winding L4, and one of the primary bridge arms in the multiple first groups of primary bridge arms or the second group of primary bridge arms may include: a switch tube S7, a switch tube S8, a switch tube S9, a switch tube S10, a capacitor C2 and an inductor L5.

[0060] The switch tube S7, the switch tube S8, the switch tube S9 and the switch tube S10 form a bridge rectifier circuit structure. The first electrode of the switch tube S7 is respectively coupled with the first electrode of the switch tube S9 and one side of the first DC bus, the second electrode of the switch tube S7 is respectively coupled with the first electrode of the switch tube S8 and the other side of the first DC bus of the capacitor C2, the second electrode of the capacitor C2 is coupled with the first end of the inductor L5, the second end of the inductor L5 is coupled with the first end of the primary winding L4 of the first transformer, the second electrode of the switch tube S9 is respectively coupled with the second end of the primary winding L4 and the first electrode of the switch tube S10, and the second electrode of the switch tube S8 is respectively coupled with the second electrode of the switch tube S10 and the first DC bus. The control electrode of the switch tube S7, the control electrode of the switch tube S8, the control electrode of the switch tube S9 and the control electrode of the switch tube S10 are coupled with the control circuit.

[0061] When the switch tubes S6 and S10 are turned on, the current output by the bridge arm circuit flows from the switch tube S6 to the switch tube S10, that is, from the first end to the second end of the primary winding L4, thereby generating the positive half-cycle power of the primary AC power. When the switch tubes S8 and S9 are turned on, the current output by the bridge arm circuit flows from the switch tube S9 to the switch tube S8, that is, from the second end to the first end of the primary winding, thereby generating the negative half-cycle of the primary AC power. The control circuit controls the switch tubes S7 and S10 to be turned on and off alternately, so that the current direction at the primary winding L4 is alternately changed, thereby obtaining the primary AC power at the primary winding L4, and the bridge arm midpoint of the secondary bridge arm receives the AC power generated by the secondary winding of the transformer, and the two ends of the secondary bridge arm output the first DC power.

[0062] continue Figure 5 As shown, Figure 5 The schematic diagram of the structure of a secondary bridge arm of the present application shows that one of the secondary bridge arms in the first group and the second group includes switch tube S11, switch tube S12, switch tube S13, switch tube S14, and capacitor C3. The first transformer includes a secondary winding L7.

[0063] Among them, the first electrode of the switch tube S11 is coupled with the first electrode of the switch tube S13, the second electrode of the switch tube S11 is coupled with the second end of the secondary winding L8 and the first electrode of the switch tube S12 respectively, the first end of the secondary winding L8 and the first end of the primary winding L4 are the same-named ends, and the first end of the secondary winding L8 is coupled with one end of the capacitor C3, and the other end of the capacitor C3 is coupled with the second electrode of the switch tube S13, the first electrode of the switch tube S13 is coupled with the first output end of the secondary circuit, the second electrode of the switch tube S13 is coupled with the first electrode of the switch tube S14, and the second electrode of the switch tube S12 and the second electrode of the switch tube S14 are coupled with the second output end of the secondary circuit.

[0064] When the switch tubes S12 and S13 are turned on, the current in the primary winding L4 flows from the first end to the second end. Since there is electromagnetic coupling between the primary winding L4 and the secondary winding L7, and the first end of the secondary winding L7 and the first end of the primary winding are the same end, the current in the secondary winding L7 flows from the second end to the first end. In other words, the current flows from the switch tube S12 to the switch tube S13, forming an output path of the secondary bridge arm.

[0065] When the switches S11 and S14 are turned on, the current in the primary winding L4 flows from the second end to the first end, so the current in the secondary winding L7 flows from the first end to the second end, that is, the current flows from the switch S14 to the switch S11, forming an output path of the secondary bridge arm. From the above process, it can be seen that the control circuit controls the switches S11 and S14 to alternately turn on and off the switches S12 and S13, so that the secondary circuit converts the AC power obtained from the primary bridge arm into DC power output.

[0066] Among them, the control circuit can adjust the voltage value output by the power conversion circuit by changing the cycle length and duty cycle of the control signal. In this case, the multiple switch tubes of the primary bridge arm can be turned on and off synchronously with the multiple switch tubes of the secondary bridge arm. It should be pointed out that the above circuit structure of the primary bridge arm and the secondary bridge arm is only an example. In the specific implementation structure, there are many possible implementation methods for the primary bridge arm and the secondary bridge arm, which are not listed one by one in the embodiments of the present application.

[0067] For the first power conversion circuit 103, when the input end of the first group of primary bridge arms of the first power conversion circuit 103 is connected to the power battery 110 through the high-voltage DC port, and the output end of the first group of secondary bridge arms of the first power conversion circuit 103 is connected to the low-voltage load 108 or the low-voltage battery 109 through the first low-voltage DC interface 106, the power battery 110 supplies power to the low-voltage load 108 or the low-voltage battery 109 through the first power conversion circuit 103.

[0068] For the on-board charging circuit 102, when the input end of the power factor correction circuit 1021 is connected to the AC charging pile 107 through the AC connection port, and the output end of the second group of secondary bridge arms of the second power conversion circuit 1022 is connected to the power battery 110 through the high-voltage DC port. The power factor correction circuit 1021 and the second power conversion circuit 1022 in the on-board charging circuit 102 are combined to have two working modes: charging mode and discharging mode. The power factor correction circuit 1021 and the first power conversion circuit 103 are controlled by the control circuit to enable the AC charging pile 107 to charge the power battery 110.

[0069] In addition, as a possible implementation, the on-board charging circuit 102 is also used to receive high-voltage direct current output by the power battery 110 and invert the high-voltage direct current into alternating current and then output it through the AC power interface 104. During the process of the on-board charging circuit 102 outputting alternating current through the AC power interface 104, the isolating switch is disconnected.

[0070] In another discharge mode, the power factor correction circuit 1021 and the first power conversion circuit 103 receive battery power provided by the power battery 110 and provide the power battery 110 power to a load outside the vehicle.

[0071] Based on the structure of the above-mentioned on-board charging circuit 102, in order to reduce the overall volume and reduce costs, and provide two power supplies for the low-voltage load 108 in the vehicle and the low-voltage battery 109, the present application proposes a new solution, which realizes multiple functions by multiplexing the power factor correction circuit 1021 and the second power conversion circuit 1022.

[0072] During the process of charging the power battery 110:

[0073] The power factor correction circuit 1021 receives AC power from the external AC charging station 107 through the AC power interface 104. The power factor correction circuit 1021 converts the AC power into DC power, improves the power factor of the input power supply, and reduces harmonic distortion.

[0074] The second power conversion circuit 1022 performs voltage boost conversion on the DC power output by the power factor correction circuit 1021 to match the high-voltage DC power required by the power battery 110 . The boosted DC power charges the power battery 110 through the high-voltage DC power interface 105 .

[0075] In the process of supplying power to the low voltage load 108 and the low voltage battery 109:

[0076] The power factor correction circuit 1021 can be reused as part of a bidirectional DC-DC converter. The circuit can invert the high-voltage DC power of the power battery 110 into low-voltage DC power suitable for the low-voltage load 108 or the low-voltage battery 109 when necessary. The second power conversion circuit 1022 is used to step down the high-voltage DC power into low-voltage DC power in normal charging mode.

[0077] The working states of the power factor correction circuit 1021 and the second power conversion circuit 1022 are dynamically adjusted according to the current working mode (charging or power supply) of the electric vehicle to ensure efficient operation in different application scenarios. By reusing the power factor correction circuit 1021 and the first power conversion circuit 103 in the existing on-board charging circuit 102, the need for additional hardware is reduced, thereby reducing the volume of the entire power supply circuit and reducing the manufacturing cost.

[0078] Continue reading Figure 3 As shown, the input end of the power factor correction circuit 1021 is connected to the AC charging pile 107 , and the output end is connected to the DC bus for charging the power battery 110 .

[0079] In the normal charging mode, the power factor correction circuit 1021 rectifies the three-phase AC power into DC power, and increases the voltage to a level suitable for charging the power battery 110 through the second power conversion circuit 1022 .

[0080] Specifically, by controlling the switching devices in the bridge arm, the three-phase AC power is rectified into pulsating DC power, and the input current waveform is adjusted to make it close to a sine wave, thereby improving the power factor and raising the DC voltage to the required level.

[0081] In the inverter step-down mode, the high-voltage direct current of the power battery 110 is first reduced to a voltage level suitable for inversion through the second power conversion circuit 1022. This step can be achieved by controlling the switching device in the second power conversion circuit 1022. The working principle of the second power conversion circuit 1022 is to reduce the input voltage by controlling the duty cycle of the switching tube. When the switch is turned on, the inductor stores energy, and when the switch is turned off, the inductor releases energy.

[0082] A suitable modulation strategy is selected to generate a PWM signal. According to the generated PWM signal, the on and off states of multiple switching devices are controlled. The upper bridge arm and the lower bridge arm of each bridge arm are alternately turned on, and the DC power output by the second power conversion circuit 1022 is further reduced.

[0083] In the inverter mode, the on-board charging circuit 102 converts the DC power from the power battery 110 into a lower DC power through two main steps: isolation step-down and inverter step-down. The step-down stage is achieved through the second power conversion circuit 1022, and the inverter stage is further reduced by controlling the switching devices in the bridge arm, combined with appropriate modulation strategies and synchronous control. This mode not only improves energy utilization efficiency, but also enables the power battery 110 of the electric vehicle to supply power to the low-voltage load 108 or the low-voltage battery 109 when needed.

[0084] See also Figure 6 As shown, Figure 6 A schematic diagram of an all-in-one power supply device for an electric vehicle in the present application Figure 2 The housing 101 further includes a second low-voltage DC interface 601 , and the first power conversion circuit 103 is used to receive high-voltage DC power and perform voltage reduction conversion on the high-voltage DC power to supply power to the low-voltage load 108 through the second low-voltage DC interface 601 .

[0085] The second low-voltage DC interface 601 is provided, so that when the first low-voltage DC interface 106 is damaged, the low-voltage load 108 can still be powered by the second low-voltage DC interface, thereby improving the reliability and fault tolerance of the system and avoiding the situation where the entire low-voltage power supply system fails due to a single interface failure.

[0086] See also Figure 7 As shown, Figure 7 A schematic diagram of an all-in-one power supply device for an electric vehicle in the present application Figure 3As a possible implementation, the all-in-one power supply device further includes an isolating switch 701, and the power factor correction circuit 1021 is used to connect to the first low-voltage DC interface 106 through the isolating switch 701. When the on-board charging circuit 102 is used to charge the power battery 110, the isolating switch 701 is used to disconnect the connection between the power factor correction circuit 1021 and the first low-voltage DC interface 106. When the on-board charging circuit 102 is used to supply power to the low-voltage load 108 or the low-voltage battery 109, the isolating switch 701 conducts the connection between the power factor correction circuit 1021 and the first low-voltage DC interface 106, and the power factor correction circuit 1021 is used to supply power to the low-voltage load 108 or the low-voltage battery 109 through the isolating switch 701.

[0087] When the on-board charging circuit 102 is used to charge the power battery 110 , the isolating switch 701 disconnects the power factor correction circuit 1021 from the first low-voltage DC power interface 106 , and the power factor correction circuit 1021 receives AC power from the external AC charging pile 107 through the AC power interface 104 .

[0088] The power factor correction circuit 1021 rectifies the AC power into DC power and improves the power factor. The second power conversion circuit 1022 performs voltage boost conversion on the DC power output by the power factor correction circuit 1021 to match the high voltage DC power required by the power battery 110 .

[0089] In this mode, the disconnection of the isolation switch 701 ensures that the power factor correction circuit 1021 is only used to process the conversion and boost of AC to DC without affecting the power supply path of the low-voltage load 108 or the low-voltage battery 109.

[0090] When the on-board charging circuit 102 is used to supply power to the low-voltage load 108 or the low-voltage battery 109, the isolating switch 701 conducts the connection between the power factor correction circuit 1021 and the first low-voltage DC interface 106. At this time, the high-voltage DC output by the power battery 110 enters the on-board charging circuit 102 through the high-voltage DC interface 105, the second power conversion circuit 1022 performs a step-down conversion on the high-voltage DC, and the power factor correction circuit 1021 performs a further step-down conversion to meet the low-voltage DC required by the low-voltage load 108 or the low-voltage battery 109.

[0091] During the process of charging the power battery 110, the isolating switch 701 disconnects the connection between the power factor correction circuit 1021 and the low-voltage DC power interface, ensuring that there is no direct electrical connection between the high-voltage charging path and the low-voltage power supply path, thereby preventing safety hazards such as current backflow or short circuit.

[0092] By controlling the state (off or on) of the isolation switch 701, different energy flow paths are selected. In the charging mode, the isolation switch 701 is off, so that the power factor correction circuit 1021 processes the conversion from AC to DC. In the power supply mode, the isolation switch 701 is on, so that the power factor correction circuit 1021 can participate in the low voltage power supply process.

[0093] In addition, the isolating switch 701 can be disconnected quickly when abnormal conditions (such as overcurrent, overvoltage, etc.) are detected to protect the safety of the power supply in the vehicle. For example, if a fault is detected in the low-voltage load 108 or the low-voltage battery 109 during the power supply process, the isolating switch 701 can be disconnected immediately to prevent the fault from spreading to other parts.

[0094] By using the isolating switch 701, the all-in-one power supply device can flexibly switch between different working modes, ensuring efficient and safe operation when charging the power battery 110 and supplying power to the low-voltage load 108 or the low-voltage battery 109. The isolating switch 701 not only realizes electrical isolation and path selection, but also enhances the protection function and versatility of the system.

[0095] See also Figure 8 As shown, Figure 8 A schematic diagram of an all-in-one power supply device for an electric vehicle in the present application Figure 4 As a possible implementation, the all-in-one power supply device includes a protection circuit 801, which is used to turn on or off the connection between the first power conversion circuit 103 and the first low-voltage DC interface 106. When the first power conversion circuit 103 fails, the protection circuit 801 disconnects the connection between the first power conversion circuit 103 and the first low-voltage DC interface 106, and the on-board charging circuit 102 is used to power the low-voltage load 108 or the low-voltage battery 109 through the first low-voltage DC interface 106.

[0096] As a possible implementation, the protection circuit 801 may be an active power switch (APS) structure, and the protection circuit 801 includes two diodes and two connection switches, wherein the anode of one diode is connected to the first end of the protection circuit 801, the anode of the other diode is connected to the second end of the protection circuit 801, and the cathode of one diode is connected to the cathode of the other diode.

[0097] One end of a connecting switch is connected to a first end of the second switch circuit, one end of another connecting switch is connected to a second end of the second switch circuit, and the other end of one connecting switch is connected to the other end of the other connecting switch.

[0098] In response to the current passing through any one of the connection switches being greater than a preset current, the connection switch having the current greater than the preset current is disconnected.

[0099] When the first power conversion circuit 103 fails (e.g., overheating, overcurrent, short circuit, etc.), the protection circuit 801 disconnects the first power conversion circuit 103 from the first low-voltage DC interface 106 to prevent the fault current from passing through the low-voltage load 108 or the low-voltage battery 109. At this time, the on-board charging circuit 102 can continue to supply power to the low-voltage load 108 or the low-voltage battery 109 through the first low-voltage DC interface 106 to ensure the normal operation of these important components.

[0100] When the system detects a fault in the low-voltage load 108 or the low-voltage battery 109 (such as a short circuit, overload, etc.), the protection circuit 801 will disconnect the connection between the first power conversion circuit 103 and the first low-voltage DC interface 106 to prevent the fault current from passing through the first power conversion circuit 103 and causing damage thereto. By disconnecting the connection, the protection switch effectively isolates the faulty part and prevents the fault from spreading to other system components, thereby ensuring the safe operation of the entire system.

[0101] By controlling the state of the protection switch (on or off), the system can select different energy flow paths. Under normal circumstances, the protection switch remains on, allowing the first power conversion circuit 103 to power the low-voltage load 108 or the low-voltage battery 109. In the event of a fault, the protection switch is disconnected and switched to the backup path, and the on-board charging circuit 102 can continue to power the low-voltage load 108 or the low-voltage battery 109 through the first low-voltage DC interface 106.

[0102] See also Fig. 9 As shown, Fig. 9 : is a structural diagram of a protection circuit. The protection circuit 801 specifically includes: a first switch 901, a second switch 902, a first diode 903 and a second diode 904, the first end of the first switch 901 serves as the first end of the protection circuit, the second end of the first switch 901 is connected to the first end of the second switch 902, the second end of the second switch 902 serves as the first end of the protection circuit, the first diode 903 is connected in parallel with the first switch 901, the second diode 904 is connected in parallel with the second switch 902, the cathode of the first diode 903 is connected to the first end of the first switch 901, the anode of the first diode 903 is connected to the anode of the second diode 904, and the cathode of the second diode 904 is connected to the second end of the second switch 902.

[0103] See also Fig.10 As shown, Fig.10 A schematic diagram of an all-in-one power supply device for an electric vehicle in the present application Figure 4As a possible implementation, the all-in-one power supply device also includes a filter circuit 1001. When the on-board charging circuit 102 is used to charge the power battery 110, the power factor correction circuit 1021 is used to receive the AC power output by the AC charging pile 107 through the filter circuit 1001. The filter circuit 1001 is used to reduce the ripple of the AC power output by the AC charging pile 107. When the on-board charging circuit 102 is used to power the low-voltage load 108, the power factor correction circuit 1021 is used to output a second low-voltage direct current through the filter circuit 1001. The filter circuit 1001 is used to reduce the ripple of the second low-voltage direct current.

[0104] The vehicle-mounted charging circuit 102 generally includes a filter circuit 1001, which is used to improve power quality and reduce electromagnetic interference. In the present application, the filter circuit 1001 can be reused to provide smooth current and voltage waveforms in different working modes.

[0105] In the process of charging the power battery 110, the power factor correction circuit 1021 receives the AC power from the AC charging pile 107 through the filter circuit 1001. The filter circuit 1001 filters the AC power to reduce its ripples, so that the input current waveform is closer to the ideal sine wave. The filtered AC power is rectified into DC power by the power factor correction circuit 1021, and the power factor is improved. Subsequently, the second power conversion circuit 1022 boosts the DC power to match the high-voltage DC power required by the power battery 110. In this case, the filter circuit 1001 ensures that the input AC power has lower ripples, thereby improving the working efficiency and stability of the power factor correction circuit 1021.

[0106] In the process of supplying power to the low-voltage load 108 or the low-voltage battery 109, the high-voltage direct current output by the power battery 110 enters the on-board charging circuit 102 through the high-voltage direct current interface 105, and the first power conversion circuit 103 steps down the high-voltage direct current to meet the low-voltage direct current required by the low-voltage load 108 or the low-voltage battery 109. The filter circuit 1001 filters the stepped-down low-voltage direct current to reduce its ripple and ensure the stability of the output voltage. The filtered low-voltage direct current supplies power to the low-voltage load 108 or the low-voltage battery 109 through the first low-voltage direct current interface 106. In this case, the filter circuit 1001 ensures that the output low-voltage direct current has lower ripples, thereby improving the working stability and reliability of the low-voltage load 108 and the low-voltage battery 109.

[0107] Among them, the main purpose of the power factor correction circuit 1021 is to improve the power factor of the input power supply and rectify the alternating current into a smooth direct current. Although the present application can achieve a certain degree of voltage reduction through the control strategy of the power factor correction circuit 1021, its main design goal is not to perform a large voltage reduction. Therefore, the voltage reduction ratio of the power factor correction circuit 1021 may not be sufficient to meet the large-scale conversion requirements from high voltage to low voltage.

[0108] In view of this, the present application also provides an all-in-one power supply device for electric vehicles, which is used to achieve a significant voltage reduction to avoid the problem of insufficient transformation ratio of the on-board charging circuit. Fig.11 As shown, Fig.11 This is a schematic diagram of another all-in-one power supply device for electric vehicles of the present application. The all-in-one power supply device includes a shell 1101, an on-board charging circuit 1102 accommodated in the shell 1101, and a first power conversion circuit 1103. The shell 1101 includes an AC power interface 1104, a high-voltage DC power interface 1105, and a first low-voltage DC power interface 1106. The AC power interface 1104 is used to connect to an AC charging pile 1107, the high-voltage DC power interface 1105 is used to connect to a power battery, and the first low-voltage DC power interface 1106 is used to connect to a low-voltage load 1108 and a low-voltage battery 1109. The first power conversion circuit 1103 is used to step down the high-voltage direct current output by the power battery and then power the low-voltage load 1108 or the low-voltage battery 1109 through the first low-voltage direct current interface 1106. The on-board charging circuit 1102 includes a power factor correction circuit 11021, a second power conversion circuit 11022 and a third power conversion circuit 11023. The on-board charging circuit 1102 is used to charge the power battery, or the on-board charging circuit 1102 is used to power the low-voltage load 1108 or the low-voltage battery 1109, wherein: when the on-board charging circuit 1102 is used to charge the power battery, the power factor correction circuit 11021 1021 is used to receive the AC power output by the AC charging pile 1107 through the AC power interface 1104 and convert the AC power into DC power. The second power conversion circuit 11022 is used to step up the DC power output by the power factor correction circuit 11021 and charge the power battery through the high-voltage DC power interface 1105. When the on-board charging circuit 1102 is used to supply power to the low-voltage load 1108 or the low-voltage battery 1109, the on-board charging circuit 1102 is used to receive the high-voltage DC power output by the power battery through the high-voltage DC power interface 1105 and step down the high-voltage DC power to supply power to the low-voltage load 1108 or the low-voltage battery 1109 through the first low-voltage DC interface.

[0109] When the on-board charging circuit is used to power a low-voltage load or a low-voltage battery, since the transformation ratio of the power factor correction circuit and the second power conversion circuit 11022 is insufficient, a third power conversion circuit 11023 can be added. When the on-board charging circuit is used to power a low-voltage load or a low-voltage battery, the second power conversion circuit 11022 is used to step down the high-voltage direct current, the power factor correction circuit is used to step down the direct current output by the second power conversion circuit 11022, and the third power conversion circuit 11023 is used to step down the direct current output by the power factor correction circuit and power the low-voltage load or the low-voltage battery.

[0110] Specifically, the second power conversion circuit performs a preliminary step-down conversion on the high-voltage direct current, reducing it from the high voltage to an intermediate voltage level. This intermediate voltage is still higher than the voltage required by the low-voltage load or the low-voltage battery. The power factor correction circuit is reused as part of a bidirectional DC-DC converter to further step down the direct current output by the second power conversion circuit. At this time, the power factor correction circuit plays a role in stepping down, further reducing the intermediate voltage to a level close to but still higher than the voltage required by the low-voltage load or the low-voltage battery.

[0111] The third power conversion circuit performs a final voltage reduction conversion on the DC power output by the power factor correction circuit, reducing it to a voltage level suitable for the low-voltage load or the low-voltage battery. The DC power after the voltage reduction by the third power conversion circuit supplies power to the low-voltage load or the low-voltage battery through the first low-voltage DC power interface.

[0112] The third power conversion circuit may be of a BUCK, BOOST, BUCK-BOOST or other circuit type, without further limitation, and may be capable of performing voltage reduction conversion on the DC power output by the power factor correction circuit.

[0113] Therefore, when the transformation ratio of the power factor correction circuit and the second power conversion circuit is insufficient, the third power conversion circuit directly steps down the high voltage DC power to the voltage level required by the low voltage load or the low voltage battery. In addition, through multi-stage step-down conversion, the voltage can be gradually reduced to improve the power conversion efficiency.

[0114] As a possible implementation, the all-in-one power supply device also includes an isolating switch, and the third power conversion circuit is used to connect to the first low-voltage DC power interface through the isolating switch. When the on-board charging circuit is used to charge the power battery, the isolating switch is used to disconnect the connection between the third power conversion circuit and the first low-voltage DC power interface. When the on-board charging circuit is used to power a low-voltage load or a low-voltage battery, the isolating switch circuit conducts the connection between the third power conversion circuit and the first low-voltage DC power interface, and the third power conversion circuit is used to power a low-voltage load or a low-voltage battery through the isolating switch.

[0115] Based on the same concept, the present application also provides an electric vehicle, which includes the all-in-one power supply device of the above embodiment.

[0116] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. An all-in-one power supply device for an electric vehicle, characterized in that: The all-in-one power supply device comprises: A housing, the housing comprising an AC interface, a high-voltage DC interface, and a first low-voltage DC interface, the AC interface being used to connect to an AC charging pile, the high-voltage DC interface being used to connect to a power battery, and the first low-voltage DC interface being used to connect to a low-voltage load and a low-voltage battery; a first power conversion circuit, the first power conversion circuit being used to step down the high-voltage direct current output by the power battery and then supply power to the low-voltage load or the low-voltage battery through the first low-voltage direct current interface; An on-board charging circuit, the on-board charging circuit comprising a power factor correction circuit and a second power conversion circuit, the on-board charging circuit is used to charge the power battery, or the on-board charging circuit is used to power the low-voltage load or the low-voltage battery, wherein: When the on-board charging circuit is used to charge the power battery, the power factor correction circuit is used to receive the AC power outputted by the AC charging pile through the AC power interface and convert the AC power into DC power, and the second power conversion circuit is used to step up the DC power outputted by the power factor correction circuit and charge the power battery through the high-voltage DC power interface; When the on-board charging circuit is used to supply power to the low-voltage load or the low-voltage battery, the on-board charging circuit is used to receive the high-voltage direct current output by the power battery through the high-voltage direct current interface and perform voltage reduction conversion on the high-voltage direct current, and then supply power to the low-voltage load or the low-voltage battery through the first low-voltage direct current interface.

2. The all-in-one power supply device according to claim 1, characterized in that: When the on-board charging circuit is used to supply power to the low-voltage load or the low-voltage battery, the second power conversion circuit is used to step down the high-voltage direct current, and the power factor correction circuit is used to step down the direct current output by the second power conversion circuit and supply power to the low-voltage load or the low-voltage battery.

3. The all-in-one power supply device according to claim 1, characterized in that: The all-in-one power supply device further includes an isolating switch, and the power factor correction circuit is used to connect the first low-voltage DC interface through the isolating switch; When the on-board charging circuit is used to charge the power battery, the isolating switch is used to disconnect the connection between the power factor correction circuit and the first low-voltage DC interface; When the on-board charging circuit is used to power the low-voltage load or the low-voltage battery, the isolating switch conducts the connection between the power factor correction circuit and the first low-voltage DC power interface, and the power factor correction circuit is used to power the low-voltage load or the low-voltage battery through the isolating switch.

4. The all-in-one power supply device according to claim 1, characterized in that: The shell also includes a second low-voltage DC power interface, and the first power conversion circuit is used to receive the high-voltage DC power and perform voltage reduction conversion on the high-voltage DC power, and then supply power to the low-voltage load or the low-voltage battery through the second low-voltage DC power interface.

5. The all-in-one power supply device according to claim 4, characterized in that: The all-in-one power supply device comprises a protection circuit, wherein the protection circuit is used to switch on or off the connection between the first power conversion circuit and the first low-voltage direct current interface; When the first power conversion circuit fails, the protection circuit disconnects the connection between the first power conversion circuit and the first low-voltage DC power interface, and the on-board charging circuit is used to power the low-voltage load or the low-voltage battery through the first low-voltage DC power interface.

6. The all-in-one power supply device according to claim 5, characterized in that: The on-board charging circuit is also used to receive the high-voltage direct current output by the power battery and invert the high-voltage direct current into alternating current and then output it through the alternating current interface. During the process of the on-board charging circuit outputting alternating current through the alternating current interface, the isolating switch is disconnected.

7. The all-in-one power supply device according to claim 1, characterized in that: The all-in-one power supply device also includes a filter circuit; When the on-board charging circuit is used to charge the power battery, the power factor correction circuit is used to receive the AC power output by the AC charging pile through the filter circuit, and the filter circuit is used to reduce the ripple of the AC power output by the AC charging pile; When the on-board charging circuit is used to supply power to the low-voltage load, the power factor correction circuit is used to output the second low-voltage direct current through the filter circuit, and the filter circuit is used to reduce the ripple of the second low-voltage direct current.

8. The all-in-one power supply device according to claim 1, characterized in that: The all-in-one power supply device comprises a first transformer, and the first power conversion circuit comprises a plurality of first groups of primary bridge arms and a plurality of first groups of secondary bridge arms; Two ends of the bridge arms of the first plurality of primary bridge arms receive the high-voltage direct current output by the power battery, and the midpoints of the bridge arms of the first plurality of primary bridge arms output alternating current to the primary winding of the first transformer; The midpoints of the multiple first groups of secondary bridge arms receive the alternating current generated by the secondary winding of the first transformer, and the two ends of the multiple first groups of secondary bridge arms supply power to the low-voltage load or the low-voltage battery through the first low-voltage direct current interface.

9. The all-in-one power supply device according to claim 1, characterized in that: The all-in-one power supply device comprises a first DC bus, the power factor correction circuit comprises a plurality of PFC bridge arms, and the first DC bus is used to connect two ends of the bridge arms of the plurality of PFC bridge arms; When the on-board charging circuit is used to charge the power battery, the midpoints of the multiple PFC bridge arms receive the AC power from the AC charging pile through the AC interface, and the two ends of the multiple PFC bridge arms output the high-voltage DC power to the first DC bus; When the on-board charging circuit is used to supply power to the low-voltage load or the low-voltage battery, the multiple PFC bridge arms receive the high-voltage direct current input by the second power conversion circuit through the first DC bus. After the multiple PFC bridge arms step down the high-voltage direct current, the midpoints of the multiple PFC bridge arms supply power to the low-voltage load or the low-voltage battery through the first low-voltage DC interface.

10. The all-in-one power supply device according to claim 9, characterized in that: The all-in-one power supply device includes a second transformer, the second power conversion circuit includes a plurality of second groups of primary bridge arms and a plurality of second groups of secondary bridge arms, and the first DC bus is used to connect the two ends of the bridge arms of the plurality of second groups of primary bridge arms; Two ends of the bridge arms of the plurality of second groups of primary bridge arms receive the high voltage direct current transmitted by the first direct current bus, and the middle points of the bridge arms of the plurality of second groups of primary bridge arms output alternating current to the primary winding of the first transformer; The midpoints of the bridge arms of the second plurality of secondary bridge arms receive the alternating current generated by the secondary winding of the first transformer, and the two ends of the second plurality of secondary bridge arms charge the power battery through the high-voltage direct current interface.

11. The all-in-one power supply device according to claim 5, characterized in that: The protection circuit comprises two diodes and two connection switches, wherein the anode of one diode is connected to the first end of the protection circuit, the anode of the other diode is connected to the second end of the protection circuit, and the cathode of the one diode is connected to the cathode of the other diode; One end of the one connecting switch is connected to the first end of the second switch circuit, one end of the other connecting switch is connected to the second end of the second switch circuit, and the other end of the one connecting switch is connected to the other end of the other connecting switch; In response to a current passing through any one of the connection switches being greater than a preset current, the connection switch having a current greater than the preset current is disconnected.

12. An all-in-one power supply device for an electric vehicle, characterized in that: The all-in-one power supply device comprises: A housing, the housing comprising an AC interface, a high-voltage DC interface, and a first low-voltage DC interface, the AC interface being used to connect to an AC charging pile, the high-voltage DC interface being used to connect to a power battery, and the first low-voltage DC interface being used to connect to a low-voltage load and a low-voltage battery; a first power conversion circuit, the first power conversion circuit being used to step down the high-voltage direct current output by the power battery and then supply power to the low-voltage load or the low-voltage battery through the first low-voltage direct current interface; An on-board charging circuit, the on-board charging circuit comprising a power factor correction circuit, a second power conversion circuit and a third power conversion circuit, the on-board charging circuit is used to charge the power battery, or the on-board charging circuit is used to power the low-voltage load or the low-voltage battery, wherein: When the on-board charging circuit is used to charge the power battery, the power factor correction circuit is used to receive the AC power outputted by the AC charging pile through the AC power interface and convert the AC power into DC power, and the second power conversion circuit is used to step up the DC power outputted by the power factor correction circuit and charge the power battery through the high-voltage DC power interface; When the on-board charging circuit is used to supply power to the low-voltage load or the low-voltage battery, the on-board charging circuit is used to receive the high-voltage direct current output by the power battery through the high-voltage direct current interface and to step down the high-voltage direct current to supply power to the low-voltage load or the low-voltage battery through the first low-voltage direct current interface.

13. The all-in-one power supply device according to claim 12, characterized in that: When the on-board charging circuit is used to supply power to the low-voltage load or the low-voltage battery, the second power conversion circuit is used to step down the high-voltage direct current, the power factor correction circuit is used to step down the direct current output by the second power conversion circuit, and the third power conversion circuit is used to step down the direct current output by the power factor correction circuit and supply power to the low-voltage load or the low-voltage battery.

14. The all-in-one power supply device according to claim 12, characterized in that: The all-in-one power supply device further includes an isolating switch, and the third power conversion circuit is used to connect the first low-voltage direct current interface through the isolating switch; When the on-board charging circuit is used to charge the power battery, the isolating switch is used to disconnect the connection between the third power conversion circuit and the first low-voltage DC interface; When the on-board charging circuit is used to power the low-voltage load or the low-voltage battery, the isolating switch circuit conducts the connection between the third power conversion circuit and the first low-voltage DC power interface, and the third power conversion circuit is used to power the low-voltage load or the low-voltage battery through the isolating switch.

15. An electric vehicle, characterized in that: The electric vehicle comprises the all-in-one power supply device as described in any one of claims 1-11, or the all-in-one power supply device as described in any one of claims 12-14.

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