A vehicle-mounted power supply device and powertrain

Abstract

This application provides an on-board power supply device and powertrain. In the on-board power supply device, an AC port receives the AC supply voltage output from an AC power source and outputs a first AC voltage to an AC load; a high-voltage DC port receives the DC supply voltage output from a power battery and outputs a DC charging voltage to the power battery; a first low-voltage DC port outputs a first output voltage to a first DC load and a low-voltage battery; and a second low-voltage DC port outputs a second output voltage to a second DC load. When the second low-voltage DC port cannot output the second output voltage, the first low-voltage DC port outputs the first output voltage to the second DC load; when the first low-voltage DC port cannot output the first output voltage, the second low-voltage DC port outputs the second output voltage to the first DC load and the low-voltage battery. This application reduces the power consumption and size of the on-board power supply device.

Description

Technical Field

[0001] This application relates to the field of vehicle charging, and more particularly to a vehicle power supply device and powertrain. Background Technology

[0002] To meet the low-voltage redundancy power supply requirements of the entire vehicle, vehicles typically employ a dual-battery system to provide low-voltage power to different low-voltage loads within the vehicle. Examples of low-voltage loads include the electromechanical braking system (EMB), steer-by-wire components, and brake-by-wire components. Currently, dual-battery systems usually incorporate two low-voltage batteries to achieve redundant power supply for low-voltage load 1 and low-voltage load 2. However, the structural design of dual-battery systems is overly complex, resulting in high power consumption and large size. Summary of the Invention

[0003] This application provides an on-board power supply device and powertrain, which avoids the use of two low-voltage batteries in the on-board power supply device. The on-board power supply device has a simple structural design and flexible redundant power supply method, thereby reducing the power consumption of the on-board power supply device and reducing the size of the on-board power supply device.

[0004] In a first aspect, embodiments of this application provide an on-board power supply device for providing a first output voltage or a second output voltage to a DC load and a low-voltage battery in a vehicle. The on-board power supply device includes an AC port, a high-voltage DC port, a redundant first low-voltage DC port, and a redundant second low-voltage DC port. The AC port is used to receive an AC supply voltage from an AC power source and output a first AC voltage to the AC load. The high-voltage DC port is used to receive a DC supply voltage from a power battery in the vehicle and output a DC charging voltage to the power battery, wherein the DC supply voltage output by the power battery is greater than the first output voltage and the second output voltage. The first low-voltage DC port is used to output the first output voltage to a first DC load and a low-voltage battery in the vehicle. The second low-voltage DC port is used to output a second output voltage to a second DC load in the vehicle. The on-board power supply device is used to receive the DC supply voltage from the power battery through the high-voltage DC port and output the first output voltage through the first low-voltage DC port and the second output voltage through the second low-voltage DC port. The first low-voltage DC port is also used to output the first output voltage to the second DC load when the on-board power supply device malfunctions and the second low-voltage DC port cannot output the second output voltage. The second low-voltage DC port is also used to output the second output voltage to the first DC load and the low-voltage battery when the on-board power supply device malfunctions and the first low-voltage DC port cannot output the first output voltage.

[0005] The aforementioned vehicle-mounted power supply device receives the DC power supply voltage output from the power battery through a high-voltage DC port and outputs a first output voltage through a first low-voltage DC port and a second output voltage through a second low-voltage DC port. This allows for redundant power supply to the first DC load, the second DC load, and the low-voltage battery via the first and second low-voltage DC ports. The first and second output voltages are mutually redundant. If the vehicle-mounted power supply device malfunctions and the second low-voltage DC port cannot output the second output voltage, the first low-voltage DC port outputs the first output voltage to the second DC load. Conversely, if the vehicle-mounted power supply device malfunctions and the first low-voltage DC port cannot output the first output voltage, the second low-voltage DC port outputs the second output voltage to the first DC load and the low-voltage battery, thus ensuring the power supply safety of the first DC load, the second DC load, and the low-voltage battery. By implementing the embodiments of this application, redundant power supply can be provided to the first DC load, the second DC load, and the low-voltage battery through the first low-voltage DC port and the second low-voltage DC port. In this redundant power supply process, it is also possible to avoid using two low-voltage batteries in the vehicle power supply device. The structural design of the vehicle power supply device is simple and the redundant power supply method is flexible, thereby reducing the power consumption of the vehicle power supply device and reducing the size of the vehicle power supply device.

[0006] In one possible implementation, the aforementioned vehicle-mounted power supply device further includes an integrated conversion circuit and a DC-DC conversion circuit. When the AC port is used to connect to an AC power source, the integrated conversion circuit receives the AC supply voltage output from the AC power source through the AC port and converts it into a DC charging voltage, which is then output to the high-voltage DC port. The integrated conversion circuit also receives the AC supply voltage output from the AC power source through the AC port and converts it into a first output voltage, which is then output to the first low-voltage DC port, enabling the first low-voltage DC port to supply power to the first DC load, the second DC load, and the low-voltage battery. When the AC port is used to connect to an AC load, the integrated conversion circuit receives the DC supply voltage output from the power battery through the high-voltage DC port and converts it into a first AC voltage, which is then output to the AC port. The integrated conversion circuit also receives the DC supply voltage output from the power battery through the high-voltage DC port and converts it into a first output voltage, which is then output to the first low-voltage DC port, enabling the first low-voltage DC port to supply power to the first DC load, the second DC load, and the low-voltage battery. The DC-DC conversion circuit receives the DC supply voltage output from the power battery through the high-voltage DC port and converts it into a second output voltage, which is then output to the second low-voltage DC port, enabling the second low-voltage DC port to supply power to the first DC load, the second DC load, and the low-voltage battery. By implementing the embodiments of this application, the existing dual power supply system can be replaced by an integrated conversion circuit and a DC-DC conversion circuit to achieve low-voltage redundant power supply for the first DC load, the second DC load, and the low-voltage battery. This avoids the use of two low-voltage batteries in the vehicle power supply device, thereby reducing the cost and size of the vehicle power supply device.

[0007] In one possible implementation, the aforementioned vehicle power supply device is used to utilize an integrated converter circuit and a DC-DC converter circuit according to changes in vehicle state. When the vehicle is in motion, the DC-DC converter circuit outputs a second output voltage to the second low-voltage DC port to supply power to the second DC load. At this time, the DC-DC converter circuit is the main power supply circuit, and the integrated converter circuit is the backup power supply circuit. The backup power supply circuit in this embodiment is used to provide power in case of a failure in the main power supply circuit. When the vehicle is in motion, if the DC-DC converter circuit experiences a short circuit or open circuit, or other faults affecting power supply, and cannot output the second output voltage to the second low-voltage DC port, the integrated converter circuit outputs a first output voltage to the first low-voltage DC port to supply power to the second DC load. At this time, the integrated converter circuit is the main power supply circuit, and the DC-DC converter circuit is the backup power supply circuit. When the vehicle is parked and the AC port is used to connect to an AC power source, the integrated converter circuit outputs a DC charging voltage to the high-voltage DC port to charge the power battery, and outputs a first output voltage to the first low-voltage DC port to supply power to the first DC load and the low-voltage battery. At this time, the vehicle is in a charging state, the integrated converter circuit is the main power supply circuit, and the DC-DC converter circuit is the backup power supply circuit. When the vehicle is parked and the AC port is used to connect an AC load, the integrated converter circuit outputs a first AC voltage to the AC port to power the AC load, and outputs a first output voltage to the first low-voltage DC port to power the first DC load and the low-voltage battery. At this time, the vehicle is in a discharging state, with the integrated converter circuit as the main power supply circuit and the DC converter circuit as a backup power supply circuit. When the vehicle is parked and the AC port is used to connect an AC power source, if the integrated converter circuit experiences a short circuit or open circuit, or other fault affecting power supply, it cannot output a DC charging voltage to the high-voltage DC port to charge the power battery, and it also cannot output a first output voltage to the first low-voltage DC port to power the first DC load and the low-voltage battery. The aforementioned DC converter circuit then outputs a second output voltage to the second low-voltage DC port to power the first DC load and the low-voltage battery. At this time, the vehicle is in a non-charging state, with the DC converter circuit as the main power supply circuit and the integrated converter circuit as a backup power supply circuit. When the vehicle is parked and the AC port is used to connect an AC load, a short circuit or open circuit in the integrated converter circuit will prevent it from outputting the first AC voltage to the AC load and also prevent it from outputting the first output voltage to the first low-voltage DC port to supply power to the first DC load and the low-voltage battery. The aforementioned DC-DC converter circuit is then used to output a second output voltage to the second low-voltage DC port to supply power to the first DC load and the low-voltage battery. At this time, the vehicle is in a non-discharging state, with the DC-DC converter circuit serving as the main power supply circuit and the integrated converter circuit as a backup power supply circuit.By implementing the embodiments of this application, different conversion circuits can be flexibly switched as the main power supply circuit and the backup power supply circuit according to the actual vehicle status. The power supply flexibility of the first DC load, the second DC load and the low-voltage battery is greater, and the power consumption of the vehicle power supply device is reduced.

[0008] In one possible implementation, the above-mentioned vehicle power supply device further includes an active switch. The first low-voltage DC port includes a first positive port, and the second low-voltage DC port includes a second positive port. The active switch connects the first positive port of the first low-voltage DC port and the second positive port of the second low-voltage DC port, and is used to connect or disconnect the electrical connection between the first and second low-voltage DC ports. Implementing the embodiments of this application allows for flexible control of the switching state of the active switch, thereby meeting different power supply requirements of the vehicle power supply device. Furthermore, by integrating a conversion circuit, a DC-DC conversion circuit, and an active switch, the existing dual-power system can be replaced, thereby avoiding the use of two low-voltage batteries in the vehicle power supply device, thus reducing the cost and size of the vehicle power supply device.

[0009] In one possible implementation, the aforementioned active switch includes two semiconductor field-effect transistors (FETs), wherein the drains of the two FETs are connected together, and the two FETs are connected in series between a first positive port and a second positive port. The FETs are used to receive commands to control the electrical connection between the first low-voltage DC port and the second low-voltage DC port, wherein the commands can be issued by the control circuit of the active switch. Implementing the embodiments of this application, when both FETs are turned on, power can be supplied to a first DC load, a second DC load, and a low-voltage battery through either the first low-voltage DC port or the second low-voltage DC port, thus increasing the power supply flexibility of the vehicle power supply device. Furthermore, the active switch can also form a current isolation when either the first positive port or the second positive port fails, thereby protecting the circuit.

[0010] In one possible implementation, when the vehicle is in driving, charging, or discharging mode, the active switch is in the ON state, and the electrical connection between the first low-voltage DC port and the second low-voltage DC port is established. By implementing this embodiment, when the vehicle is in any of the driving, charging, or discharging states, power can be supplied to the first DC load, the second DC load, and the low-voltage battery through either the first or second low-voltage DC port, resulting in higher power supply efficiency for the on-board power supply device.

[0011] In one possible implementation, the aforementioned vehicle power supply device is used to perform voltage conversion in at most one of the integrated conversion circuit and the DC-DC conversion circuit when the vehicle is in driving, charging, or discharging state, and the active switch is conducting the electrical connection between the first low-voltage DC port and the second low-voltage DC port. Implementing the embodiments of this application, when the main power supply circuit in the integrated conversion circuit and the DC-DC conversion circuit fails, i.e., when the vehicle power supply device experiences a single point of failure, the low-voltage DC port corresponding to the backup power supply circuit can supply power to the first DC load, the second DC load, and the low-voltage battery, thereby improving the power supply reliability of the DC load and the low-voltage battery.

[0012] In one possible implementation, the on-board power supply device is configured to perform voltage conversion in at least one of the integrated conversion circuit and the DC-DC conversion circuit when the vehicle is in a driving state, charging state, or discharging state, and the active switch disconnects the electrical connection between the first low-voltage DC port and the second low-voltage DC port. Implementing the embodiments of this application, when one of the active switch, the first low-voltage DC port, or the second low-voltage DC port fails—that is, when the on-board power supply device experiences a single point of failure—at least one of the first and second low-voltage DC ports can receive low-voltage DC power and supply power to the corresponding DC load, thereby improving the reliability of the DC load power supply.

[0013] In one possible implementation, the aforementioned vehicle-mounted power supply device further includes a first fuse, through which the control circuit of the active switch is connected to the first low-voltage DC port. The first fuse is designed to blow in the event of a short circuit at the first low-voltage DC port, or in the event of a short circuit in the active switch. This isolates short-circuit faults at the first low-voltage DC port or the active switch, preventing the short-circuit fault from propagating to the control circuit of the active switch and causing it to fail, thereby reducing the failure rate of the active switch's control circuit.

[0014] In one possible implementation, when a short circuit occurs at the second low-voltage DC port, the short-circuit fault at the second low-voltage DC port will propagate through the active switch to the first low-voltage DC port, thereby causing a short circuit at the first low-voltage DC port. Therefore, the aforementioned first fuse is also used to blow in the event of a short circuit at the second low-voltage DC port, isolating the short-circuit fault at the second low-voltage DC port and preventing the short-circuit fault from propagating to the control circuit of the active switch and causing it to fail, thus reducing the failure rate of the active switch's control circuit.

[0015] In one possible implementation, the aforementioned vehicle power supply device further includes a second fuse, through which the control circuit of the integrated converter circuit is connected to the second low-voltage DC port and the low-voltage battery. The second fuse is designed to blow in the event of a short circuit in any of the second low-voltage DC port, the low-voltage battery, or the interface through which the low-voltage battery supplies power to the control circuit of the integrated converter circuit. This isolates the short-circuit fault to prevent it from propagating to the control circuit of the integrated converter circuit, thereby reducing the failure rate of the control circuit.

[0016] In one possible implementation, the aforementioned on-board power supply device further includes a third fuse, through which the control circuit of the DC-DC converter is connected to the second low-voltage DC port and the low-voltage battery. The third fuse is designed to blow in the event of a short circuit in any of the second low-voltage DC port, the low-voltage battery, or the interface through which the low-voltage battery supplies power to the control circuit of the integrated converter circuit. This isolates the short-circuit fault to prevent it from propagating to the control circuit of the DC-DC converter, thereby reducing the failure rate of the control circuit.

[0017] In one possible implementation, the first low-voltage DC port includes a first negative port, and the second low-voltage DC port includes a second negative port, wherein the first negative port and the second negative port are connected. By implementing the embodiments of this application, when the main power switch is turned on, a loop can be formed between the first low-voltage DC port and the second low-voltage DC port, thereby satisfying the need to supply power to the first DC load, the second DC load, and the low-voltage battery through either low-voltage DC port.

[0018] In one possible implementation, the aforementioned vehicle-mounted power supply device further includes a first chip and a second chip. The first chip controls the integrated converter circuit to perform voltage conversion, and the second chip controls the DC-DC converter circuit to perform voltage conversion. That is, both the integrated converter circuit and the DC-DC converter circuit are controlled by independent chips. By implementing the embodiments of this application, when one of the first chip or the second chip fails, it will not interfere with the other chip controlling the corresponding converter circuit, thus improving the control reliability of the vehicle-mounted power supply device.

[0019] Secondly, embodiments of this application provide a powertrain including a drive motor and an on-board power supply device as described in the first aspect and its possible embodiments. The on-board power supply device further includes an inverter circuit. The inverter circuit receives the DC power supply voltage output from the power battery through a high-voltage DC port and converts it into a three-phase AC voltage output. The three-phase AC voltage is used to supply the drive motor with operating torque and speed, thereby meeting the vehicle's driving requirements.

[0020] It should be understood that the implementations and beneficial effects of the above-mentioned aspects of this application can be referenced from each other. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the vehicle structure provided in the embodiments of this application;

[0022] Figure 2 This is a schematic diagram of the electronic control of the powertrain provided in the embodiments of this application;

[0023] Figure 3 This is a schematic diagram of the structure of the vehicle power supply device provided in the embodiments of this application;

[0024] Figure 4 This is a circuit diagram of an on-board power supply device provided in an embodiment of this application;

[0025] Figure 5 This is another circuit diagram of the vehicle power supply device provided in the embodiments of this application;

[0026] Figure 6 This is another circuit diagram of the vehicle power supply device provided in the embodiments of this application;

[0027] Figure 7 This is another circuit diagram of the vehicle power supply device provided in the embodiments of this application. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] The implementation of the technical solution of this application will be further described in detail below with reference to the accompanying drawings.

[0030] See Figure 1 , Figure 1 This is a structural schematic diagram of the vehicle provided in an embodiment of this application. For example... Figure 1 As shown, vehicle 1 includes a powertrain 11 and a power battery 12. The powertrain 11 includes a drive motor 111 and an on-board power supply unit 112. The on-board power supply unit 112 includes a high-voltage DC port 1121 and an inverter circuit 1122. When the powertrain 11 receives DC power, the inverter circuit 1122 receives the DC power supply voltage output from the power battery 12 through the high-voltage DC port 1121 and converts it into a three-phase AC voltage output. This three-phase AC voltage supplies the drive motor 111 with operating torque and speed, allowing the drive motor 111 to convert electrical energy into mechanical energy and drive the vehicle 1.

[0031] The above-mentioned powertrain 11 electronic control schematic diagram can be seen as follows: Figure 2 As shown above, Figure 1 The drive motor 111 shown includes a U-phase winding, a V-phase winding, and a W-phase winding. The inverter circuit 1122 includes a capacitor C0 and switching transistors S1 to S6. The two ends of capacitor C0 are connected to the high-voltage DC port 1121. Switches S1 and S2 are connected in series and then in parallel with capacitor C0; switches S3 and S4 are connected in series and then in parallel with capacitor C0; and switches S5 and S6 are connected in series and then in parallel with capacitor C0. The series connection point of switches S1 and S2 is connected to the U-phase winding; the series connection point of switches S3 and S4 is connected to the V-phase winding; and the series connection point of switches S5 and S6 is connected to the W-phase winding. When the inverter circuit 1122 receives DC power, capacitor C0 is used to reduce or eliminate fluctuations in the DC power supply voltage. Switches S1 to S6 are used to invert the DC power supply voltage into a three-phase AC voltage and output it to the U-phase winding, V-phase winding and W-phase winding so that the drive motor 111 can work to output torque and speed, thereby driving the vehicle 1 to move.

[0032] like Figure 2 As shown above, Figure 1The illustrated on-board power supply device 112 also includes an integrated conversion circuit 1123 and a DC-DC conversion circuit 1124. When the integrated conversion circuit 1123 receives AC power, it converts the AC supply voltage output from the AC power source 13 into a DC charging voltage and outputs it to the high-voltage DC port 1121, so that the high-voltage DC port 1121 charges the power battery 12. The integrated conversion circuit 1123 also converts the AC supply voltage into a first output voltage and supplies power to the first DC load 16, the second DC load 17, and the low-voltage battery 15. When the integrated conversion circuit 1123 receives DC power, it receives the DC supply voltage output from the power battery 12 through the high-voltage DC port 1121 and converts it into a first AC voltage to supply power to the AC load 14. The integrated conversion circuit 1123 also converts the DC supply voltage into a first output voltage to supply power to the first DC load 16, the second DC load 17, and the low-voltage battery 15. The aforementioned DC-DC converter circuit 1124 is used to receive the DC power supply voltage output by the power battery 12 through the high-voltage DC port 1121 and convert it into a second output voltage to supply power to the first DC load 16, the second DC load 17 and the low-voltage battery 15. The first output voltage and the second output voltage are backup voltages for each other. The first output voltage and the second output voltage are usually equal. Sometimes, while ensuring that the first DC load 16 and the second DC load 17 can work normally and the low-voltage battery 15 can be charged, the first output voltage and the second output voltage can be set to differ by less than 10% as needed to save energy, extend the power supply time, and ensure safer voltage backup supply.

[0033] The following will combine Figures 3 to 7 The specific structure and working principle of the vehicle-mounted power supply device are illustrated with examples.

[0034] See Figure 3 , Figure 3 This is a schematic diagram of the structure of the vehicle-mounted power supply device provided in the embodiments of this application. Figure 3As shown, the on-board power supply device 2 provides a first output voltage Vout1 or a second output voltage Vout2 to the vehicle's DC load and the vehicle's low-voltage battery 42. The vehicle's DC load includes a first DC load 51 and a second DC load 52. For example, either the first output voltage Vout1 or the second output voltage Vout2 can be 12V or 48V. The on-board power supply device 2 includes an AC port, a high-voltage DC port HVDC, a redundant first low-voltage DC port LVDC1, and a redundant second low-voltage DC port LVDC2. The AC port is used to connect to the AC power supply 31 or the AC load 32, and the high-voltage DC port HVDC is used to connect to the power battery 41. The first low-voltage DC port LVDC1 is used to connect the first DC load 51 and the low-voltage battery 42, and the second low-voltage DC port LVDC2 is used to connect the second DC load 52. Optionally, the first low-voltage DC port LVDC1 is used to connect the first DC load 51, and the second low-voltage DC port LVDC2 is used to connect the second DC load 52 and the low-voltage battery 42. This application does not limit the specific connection location of the low-voltage battery 42.

[0035] The AC port is used to receive the AC supply voltage output from the AC power source 31 and to output a first AC voltage to the AC load 32. For example, the AC supply voltage or the first AC voltage can be a single-phase AC voltage or a three-phase AC voltage, and there is no limitation herein.

[0036] The high-voltage DC port HVDC is used to receive the DC supply voltage output from the power battery 41 in the vehicle and to output a DC charging voltage to the power battery 41. The DC supply voltage output by the power battery 41 is greater than the first output voltage Vout1 and the second output voltage Vout2.

[0037] The first low-voltage DC port LVDC1 is used to output the first output voltage Vout1 to the first DC load 51 and the low-voltage battery 42 in the vehicle.

[0038] The second low-voltage DC port LVDC2 is used to output the second output voltage Vout2 to the second DC load 52 in the vehicle.

[0039] The first low-voltage DC port LVDC1 is also used to output the first output voltage Vout1 to the second DC load 52 when the vehicle power supply device 112 fails and the second low-voltage DC port LVDC2 cannot output the second output voltage Vout2. The second low-voltage DC port LVDC2 is also used to output the second output voltage Vout2 to the first DC load 51 and the low-voltage battery 42 when the vehicle power supply device 112 fails and the first low-voltage DC port LVDC1 cannot output the first output voltage Vout1.

[0040] The on-board power supply device 2 is used to receive the DC power supply voltage output by the power battery 41 through the high voltage DC port HVDC and output the first output voltage Vout1 through the first low voltage DC port LVDC1 and the second output voltage Vout2 through the second low voltage DC port LVDC2, thereby realizing redundant power supply for the first DC load 51, the second DC load 52 and the low voltage battery 42.

[0041] It is understood that the above is only a functional description of the AC port, the high voltage DC port HVDC, the first low voltage DC port LVDC1, the second low voltage DC port LVDC2, and the vehicle power supply device 2, and does not mean that all operations described in the functional description will occur simultaneously.

[0042] In implementing the embodiments of this application, the first output voltage Vout1 and the second output voltage Vout2 are mutually redundant, thereby ensuring the power supply safety of the first DC load 51, the second DC load 52, and the low-voltage battery 42. Redundant power supply can be provided to the first DC load 51, the second DC load 52, and the low-voltage battery 42 through the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2. In this redundant power supply process, the use of two low-voltage batteries in the vehicle power supply device 2 can also be avoided. The vehicle power supply device 2 has a simple structural design and flexible redundant power supply method, thereby reducing the power consumption of the vehicle power supply device 2 and reducing its size.

[0043] When the AC port is used to connect to the AC power supply 31, the vehicle power supply device 2 is also used to receive the AC power supply voltage output by the AC power supply 31 through the AC port and output a DC charging voltage through the high voltage DC port HVDC to charge the power battery 41. The vehicle power supply device 2 is also used to receive the AC power supply voltage output by the AC power supply 31 through the AC port and output a first output voltage Vout1 through the first low voltage DC port LVDC1, so that the first low voltage DC port LVDC1 supplies power to the first DC load 51, the second DC load 52 and the low voltage battery 42.

[0044] When the AC port is used to connect the AC load 32, the vehicle power supply device 2 is also used to receive the DC power supply voltage output by the power battery 41 through the high-voltage DC port HVDC and output a first AC voltage through the AC port AC to supply power to the AC load 32. The vehicle power supply device 2 is also used to receive the DC power supply voltage output by the power battery 41 through the high-voltage DC port HVDC and output a first output voltage Vout1 through the first low-voltage DC port LVDC1, so that the first low-voltage DC port LVDC1 supplies power to the first DC load 51, the second DC load 52 and the low-voltage battery 42.

[0045] exist Figure 3In a corresponding embodiment, the first DC load 51 includes the main load within the vehicle, and the second DC load 52 includes the functional safety backup load and other secondary loads within the vehicle. For example, the main load within the vehicle may be the steering system, braking system, battery management system, motor controller, lights, and fan; the functional safety backup load may be the vehicle driving dynamics control system and the steering and braking systems; and other secondary loads may be the battery management system. These are merely examples and are not intended to be limiting. Optionally, the first DC load 51 includes the functional safety backup load and other secondary loads within the vehicle, and the second DC load 52 includes the main load within the vehicle. It should be understood that the specific load type and quantity of the first DC load 51 and the second DC load 52 can be determined by the actual electrical structure of the vehicle and are not limited here.

[0046] See Figure 4 , Figure 4 This is a circuit diagram of an on-board power supply device provided in an embodiment of this application. For example... Figure 4 As shown above, Figure 3 The illustrated on-board power supply device 2 includes an integrated converter circuit 21 and a DC-DC converter circuit 22. Exemplarily, the DC-DC converter circuit 22 can be a half-bridge hard-switching converter circuit, a full-bridge converter circuit, or an LLC resonant converter circuit. Specifically, the AC terminal ac1 of the integrated converter circuit 21 is connected to the AC port, the first DC terminal dc1 of the integrated converter circuit 21 is connected to the high-voltage DC port HVDC, and the second DC terminal dc2 of the integrated converter circuit 21 is connected to the first low-voltage DC port LVDC1. Similarly, the first DC terminal dc3 of the aforementioned DC-DC converter circuit 22 is connected to the high-voltage DC port HVDC, and the second DC terminal dc4 of the DC-DC converter circuit 22 is connected to the second low-voltage DC port LVDC2.

[0047] When the AC port is used to connect to the AC power supply 31, the integrated conversion circuit 21 receives the AC supply voltage output from the AC power supply 31 through the AC port and converts it into a DC charging voltage, which is then output to the high-voltage DC port HVDC to charge the power battery 41. The integrated conversion circuit 21 also receives the AC supply voltage output from the AC power supply 31 through the AC port and converts it into a first output voltage Vout1, which is then output to the first low-voltage DC port LVDC1 to supply power to the first DC load 51, the second DC load 52, and the low-voltage battery 42.

[0048] When the AC port is used to connect the AC load 32, the integrated conversion circuit 21 receives the DC supply voltage output from the power battery 41 through the high-voltage DC port HVDC and converts it into a first AC voltage, which is then output to the AC port AC, so that the AC port AC supplies power to the AC load 32. The integrated conversion circuit 21 also receives the DC supply voltage output from the power battery 41 through the high-voltage DC port HVDC and converts it into a first output voltage Vout1, which is then output to the first low-voltage DC port LVDC1, so that the first low-voltage DC port LVDC1 supplies power to the first DC load 51, the second DC load 52, and the low-voltage battery 42.

[0049] The DC-DC converter circuit 22 described above is used to receive the DC power supply voltage output by the power battery 41 through the high voltage DC port HVDC and convert it into the second output voltage Vout2 and output it to the second low voltage DC port LVDC2, so that the second low voltage DC port LVDC2 supplies power to the first DC load 51, the second DC load 52 and the low voltage battery 42.

[0050] By implementing the embodiments of this application, the existing dual power supply system can be replaced by the integrated conversion circuit 21 and the DC-DC conversion circuit 22 to achieve low-voltage redundant power supply for the first DC load 51, the second DC load 52 and the low-voltage battery 42, thereby avoiding the use of two low-voltage batteries in the vehicle power supply device 2, thereby reducing the cost of the vehicle power supply device 2 and reducing its size.

[0051] To reduce the power consumption of the vehicle power supply device 2, the vehicle power supply device 2 can use an integrated conversion circuit 21 and a DC-DC conversion circuit 22 according to changes in vehicle state. For example, the vehicle state can be driving state, charging state, discharging state, non-charging state, or non-discharging state.

[0052] When the vehicle is in operation, and the second DC load 52 includes the vehicle's functional safety backup load and other secondary loads, the DC-DC converter circuit 22 outputs a second output voltage Vout2 to the second low-voltage DC port LVDC2 to supply power to the second DC load 52. At this time, the DC-DC converter circuit 22 is the main power supply circuit, and the integrated converter circuit 21 is the backup power supply circuit. The backup power supply circuit in this embodiment is used to provide power in the event of a failure in the main power supply circuit.

[0053] When the vehicle is in operation, and the first DC load 51 includes the vehicle's functional safety backup load and other secondary loads, if the DC-DC converter circuit 22 experiences a short circuit or open circuit, affecting power supply, it will be unable to output the second output voltage Vout2 to the second low-voltage DC port LVDC2. In this case, the integrated converter circuit 21 will output the first output voltage Vout1 to the first low-voltage DC port LVDC1 to supply power to the second DC load 52. At this time, the integrated converter circuit 21 is the main power supply circuit, and the DC-DC converter circuit 22 is the backup power supply circuit.

[0054] When the vehicle is parked and the AC port is connected to the AC power supply 31, the integrated converter circuit 21 outputs a DC charging voltage to the high-voltage DC port HVDC to charge the power battery 41, and outputs a first output voltage Vout1 to the first low-voltage DC port LVDC1 to supply power to the first DC load 51 and the low-voltage battery 42. At this time, the vehicle is either charging or parked and charging; the integrated converter circuit 21 is the main power supply circuit, and the DC converter circuit 22 is the backup power supply circuit. When the vehicle is parked and the AC port is connected to the AC load 32, the integrated converter circuit 21 outputs a first AC voltage to the AC port AC to supply power to the AC load 32, and outputs a first output voltage Vout1 to the first low-voltage DC port LVDC1 to supply power to the first DC load 51 and the low-voltage battery 42. At this time, the vehicle is either discharging or parked and discharging; the integrated converter circuit 21 is the main power supply circuit, and the DC converter circuit 22 is the backup power supply circuit. When implementing the embodiments of this application, the integrated conversion circuit 21 is already in operation when the vehicle is in a charging or discharging state. At this time, the already operating integrated conversion circuit 21 is used as the main power supply circuit to supply power, which can avoid the situation where the two conversion circuits work at the same time due to the start of the DC-DC conversion circuit 22, thereby reducing the power consumption of the vehicle power supply device 2 and thus reducing the overall power consumption of the vehicle.

[0055] When the vehicle is parked and the AC port is used to connect to AC power supply 31, the integrated converter circuit 21 may experience a short circuit or open circuit, affecting power supply. It will be unable to output DC charging voltage to the high-voltage DC port HVDC to charge the power battery 41, and it will also be unable to output the first output voltage Vout1 to the first low-voltage DC port LVDC1 to supply power to the first DC load 51 and the low-voltage battery 42. The aforementioned DC converter circuit 22 is used to output the second output voltage Vout2 to the second low-voltage DC port LVDC2 to supply power to the first DC load 51 and the low-voltage battery 42. At this time, when the vehicle is not charging or is parked and not charging, the DC converter circuit 22 is the main power supply circuit, and the integrated converter circuit 21 is the backup power supply circuit. When the vehicle is parked and the AC port is used to connect to AC load 32, the integrated converter circuit 21 may experience a short circuit or open circuit, affecting power supply. It will be unable to output the first AC voltage to the AC port AC to supply power to the AC load 32, and it will also be unable to output the first output voltage Vout1 to the first low-voltage DC port LVDC1 to supply power to the first DC load 51 and the low-voltage battery 42. The aforementioned DC-DC converter circuit 22 is used to output a second output voltage Vout2 to the second low-voltage DC port LVDC2 to supply power to the first DC load 51 and the low-voltage battery 42. At this time, the vehicle is in a non-discharging state or a parked non-discharging state. The DC-DC converter circuit 22 is the main power supply circuit, and the integrated converter circuit 21 is the backup power supply circuit. It should be understood that the integrated converter circuit 21 integrates charging / discharging functions and port power supply functions, while the DC-DC converter circuit 22 only integrates port power supply functions. Therefore, compared with the integrated converter circuit 21, the DC-DC converter circuit 22 has lower power consumption during operation. Implementing the embodiments of this application, when the vehicle is in a non-charging or non-discharging state, the integrated converter circuit 21 is not working. At this time, the DC-DC converter circuit 22, with lower power consumption, is used as the main power supply circuit, which can reduce the power consumption of the on-board power supply device 2, thereby reducing the overall power consumption of the vehicle.

[0056] As can be seen, the vehicle power supply device 2 can flexibly switch between different conversion circuits as the main power supply circuit and the backup power supply circuit according to the actual vehicle status. The power supply flexibility of the first DC load 51, the second DC load 52 and the low-voltage battery 42 is stronger, and the power consumption of the vehicle power supply device 2 is reduced.

[0057] See Figure 5 , Figure 5 This is another circuit diagram of the vehicle power supply device provided in the embodiments of this application. For example... Figure 5 As shown above, Figure 4The vehicle-mounted power supply device 2 shown also includes an active power switch (APS) 23. This active power switch 23 is an active switch connected between the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2, and it is bidirectionally cut off. The first low-voltage DC port LVDC1 includes a first positive port LVDC1+ and a first negative port LVDC1-, and the second low-voltage DC port LVDC2 includes a second positive port LVDC2+ and a second negative port LVDC2-. The active power switch 23 is used to connect the first positive port LVDC1+ of the first low-voltage DC port LVDC1 and the second positive port LVDC2+ of the second low-voltage DC port LVDC2, and to connect the first negative port LVDC1- to the second negative port LVDC2-.

[0058] The aforementioned active switch 23 is used to connect or disconnect the electrical connection between the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2. For example, when the vehicle power supply device 2 is not faulty, or when one of the integrated conversion circuit 21 and the DC-DC conversion circuit 22 fails, the active switch 23 connects the electrical connection between the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2. When one of the active switch 23, the first low-voltage DC port LVDC1, and the second low-voltage DC port LVDC2 fails, the active switch 23 disconnects the electrical connection between the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2. By implementing the embodiments of this application, the switching state of the active switch 23 can be flexibly controlled, thereby meeting the different power supply needs of the vehicle power supply device 2. In addition, the existing dual power supply system can be replaced by an integrated conversion circuit 21, a DC-DC conversion circuit 22 and an active switch 23, thereby avoiding the use of two low-voltage batteries in the vehicle power supply device 2, thus reducing the cost and size of the vehicle power supply device 2.

[0059] The aforementioned active switch 23 can be composed of at least one of a switch and a diode, wherein the number of switches and diodes and their specific connection method can be determined by the actual application scenario and are not limited herein. Figure 4In this active switch 23, two metal-oxide-semiconductor field-effect transistors (MOSFETs) are included. The drains of the two MOSFETs are connected together, and they are connected in series between the first positive port LVDC1+ and the second positive port LVDC2+. These MOSFETs are used to receive commands to control the electrical connection between the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2. These commands can be issued by the control circuit of the active switch 23 (as described in control circuit 24). When the integrated converter circuit 21 outputs a first output voltage Vout1 to the first low-voltage DC port LVDC1, and the first low-voltage DC port LVDC1 supplies power to the first DC load 51 and the low-voltage battery 42, the first low-voltage DC port LVDC1 is also used to output the first output voltage Vout1 to the second low-voltage DC port LVDC2 via the two MOSFETs to supply power to the second DC load 52. When the DC-DC converter circuit 22 outputs a second output voltage Vout2 to the second low-voltage DC port LVDC2 and supplies power to the second DC load 52, the second low-voltage DC port LVDC2 is also used to output a second output voltage Vout2 to the first low-voltage DC port LVDC1 via two semiconductor field-effect transistors to supply power to the first DC load 51 and the low-voltage battery 42. Implementing this embodiment, when the two semiconductor field-effect transistors are turned on, power can be supplied to the first DC load 51, the second DC load 52, and the low-voltage battery 42 through either the first low-voltage DC port LVDC1 or the second low-voltage DC port LVDC2, thus increasing the power supply flexibility of the vehicle power supply device 2. Furthermore, the active switch 23 can also form a current interruption when either the first positive port LVDC1+ or the second positive port LVDC2+ fails, thereby protecting the circuit.

[0060] When the vehicle is in any of the following states: driving, charging, discharging, non-charging, or non-discharging, the active switch 23 is in the ON state, and the electrical connection between the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2 is established. By implementing this embodiment, when the vehicle is in any of these states, it can supply power to the first DC load 51, the second DC load 52, and the low-voltage battery 42 through either the first low-voltage DC port LVDC1 or the second low-voltage DC port LVDC2, resulting in higher power supply efficiency for the on-board power supply device 2.

[0061] When the vehicle is in any of the following states: driving, charging, discharging, non-charging, or non-discharging, and the active switch 23 connects the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2, at most one of the integrated converter circuit 21 and the DC-DC converter circuit 22 performs voltage conversion. For example, when the DC-DC converter circuit 22 fails as the main power supply circuit, the integrated converter circuit 21 will act as a backup power supply circuit to perform voltage conversion and output a first output voltage Vout1 to the first low-voltage DC port LVDC1. At this time, the first low-voltage DC port LVDC1 can supply power to the first DC load 51, the second DC load 52, and the low-voltage battery 42. When the integrated converter circuit 21 fails as the main power supply circuit, the DC-DC converter circuit 22 will act as a backup power supply circuit to perform voltage conversion and output a second output voltage Vout2 to the second low-voltage DC port LVDC2. At this time, the second low-voltage DC port LVDC2 can supply power to the first DC load 51, the second DC load 52, and the low-voltage battery 42. When the main power supply circuit in the integrated conversion circuit 21 and the DC-DC conversion circuit 22 fails, i.e., when the vehicle power supply device 2 experiences a single point of failure, the low-voltage DC port corresponding to the backup power supply circuit can supply power to the first DC load 51, the second DC load 52 and the low-voltage battery 42, thereby improving the power supply reliability of the DC load and the low-voltage battery 42.

[0062] When the vehicle is in any of the following states: driving, charging, discharging, non-charging, and non-discharging, and the active switch 23 disconnects the electrical connection between the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2, at least one of the integrated converter circuit 21 and the DC-DC converter circuit 22 performs voltage conversion.

[0063] For example, when the active switch 23 fails, the integrated converter circuit 21 performs voltage conversion and outputs a first output voltage Vout1 to the first low-voltage DC port LVDC1, and the DC-DC converter circuit 22 performs voltage conversion and outputs a second output voltage Vout2 to the second low-voltage DC port LVDC2. At this time, the first low-voltage DC port LVDC1 can supply power to the first DC load 51 and the low-voltage battery 42, and the second low-voltage DC port LVDC2 can supply power to the second DC load 52. The failure of the active switch 23 can be any one of an overvoltage fault, a short-circuit fault, or an undervoltage fault.

[0064] For example, when either the first low-voltage DC port LVDC1 or the second low-voltage DC port LVDC2 fails, and the DC-DC converter circuit 22 acts as the main power supply circuit and has the function of fault recovery, the integrated converter circuit 21 performs voltage conversion and outputs a first output voltage Vout1 to the first low-voltage DC port LVDC1. After fault recovery, the DC-DC converter circuit 22 outputs a second output voltage Vout2 to the second low-voltage DC port LVDC2. At this time, the first low-voltage DC port LVDC1 can supply power to the first DC load 51 and the low-voltage battery 42, and the second low-voltage DC port LVDC2 can supply power to the second DC load 52. When either the first low-voltage DC port LVDC1 or the second low-voltage DC port LVDC2 fails, and the DC-DC converter circuit 22 acts as the main power supply circuit and does not have the function of fault recovery, the DC-DC converter circuit 22 will stop outputting to quickly isolate the faulty low-voltage DC port, thereby avoiding failure of the DC-DC converter circuit 22. The integrated converter circuit 21 performs voltage conversion and outputs the first output voltage Vout1 to the first low-voltage DC port LVDC1. At this time, the first low-voltage DC port LVDC1 can supply power to the first DC load 51 and the low-voltage battery 42.

[0065] For example, when either the first low-voltage DC port LVDC1 or the second low-voltage DC port LVDC2 fails, and the integrated converter circuit 21, acting as the main power supply circuit and possessing fault recovery capabilities, outputs a first output voltage Vout1 to the first low-voltage DC port LVDC1 after fault recovery. The DC-DC converter circuit 22 performs voltage conversion and outputs a second output voltage Vout2 to the second low-voltage DC port LVDC2. At this time, the first low-voltage DC port LVDC1 can supply power to the first DC load 51 and the low-voltage battery 42, and the second low-voltage DC port LVDC2 can supply power to the second DC load 52. When either the first low-voltage DC port LVDC1 or the second low-voltage DC port LVDC2 fails, and the integrated converter circuit 21, acting as the main power supply circuit, does not possess fault recovery capabilities, the integrated converter circuit 21 will stop outputting to quickly isolate the faulty low-voltage DC port, thereby preventing the integrated converter circuit 21 from failing. The DC-DC converter circuit 22 performs voltage conversion and outputs a second output voltage Vout2 to the second low-voltage DC port LVDC2. At this time, the second low-voltage DC port LVDC2 can supply power to the second DC load 52.

[0066] The fault occurring at the first low-voltage DC port LVDC1 or the second low-voltage DC port LVDC2 can be any one of an overvoltage fault, a short-circuit fault, or an undervoltage fault. For example, when the main power supply circuit has the function of recovering from an overvoltage fault, the main power supply circuit stops outputting voltage to reduce the voltage of the corresponding low-voltage DC port when an overvoltage fault occurs at the low-voltage DC port corresponding to the main power supply circuit (i.e., the voltage of the corresponding low-voltage DC port is greater than or equal to a first preset voltage value). Then, when the voltage of the corresponding low-voltage DC port decreases to a second preset voltage value, it resumes outputting voltage to the corresponding low-voltage DC port, thereby quickly recovering from the overvoltage fault at the low-voltage DC port. The second preset voltage value is a pre-set voltage value for restoring the output of the main power supply circuit, and this second preset voltage value is less than the first preset voltage value but greater than the rated voltage of the corresponding port of the main power supply circuit. When the main power supply circuit has the function of recovering from short-circuit faults, it reduces the current of the corresponding low-voltage DC port to a second preset current value and continues to output voltage to the corresponding low-voltage DC port when a short-circuit fault occurs at the low-voltage DC port of the main power supply circuit (i.e., the current at the low-voltage DC port of the main power supply circuit is greater than or equal to a first preset current value). The second preset current value is the maximum operating current that the main power supply circuit can withstand. When the main power supply circuit has the function of recovering from undervoltage faults, it continues to output voltage to the corresponding low-voltage DC port when an undervoltage fault occurs at the low-voltage DC port of the main power supply circuit (i.e., the voltage at the low-voltage DC port of the main power supply circuit is less than or equal to a third preset voltage value). The third preset voltage value is less than the rated voltage of the main power supply circuit.

[0067] By implementing the embodiments of this application, when one of the active active switch 23, the first low-voltage DC port LVDC1, and the second low-voltage DC port LVDC2 fails, i.e. when the vehicle power supply device 2 experiences a single point of failure, at least one of the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2 can obtain low-voltage DC power supply and supply power to the corresponding DC load, thereby improving the power supply reliability of the DC load.

[0068] See Figure 6 , Figure 6 This is another circuit diagram of the vehicle power supply device provided in the embodiments of this application. For example... Figure 6 As shown above, Figure 5The vehicle-mounted power supply device 2 shown also includes a control circuit 24 and a first fuse 25 corresponding to the active switch 23. For example, the control circuit 24 can be an analog control chip. The control circuit 24 is connected to the first low-voltage DC port LVDC1 via the first fuse 25. The control circuit 24 receives the first output voltage Vout1 from the first low-voltage DC port LVDC1 via the first fuse 25 and controls the active switch 23 to either turn on or off the electrical connection between the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2. The first fuse 25 is used to blow in the event of a short circuit in the first low-voltage DC port LVDC1, or to blow in the event of a short circuit in the active switch 23. This isolates short-circuit faults in the first low-voltage DC port LVDC1 or the active switch 23, preventing the short-circuit fault from propagating to the control circuit 24 and causing it to fail, thereby reducing the failure rate of the control circuit 24.

[0069] When a short circuit occurs at the second low-voltage DC port LVDC2, the short-circuit fault at LVDC2 will propagate through the active switch 23 to the first low-voltage DC port LVDC1, causing a short circuit at LVDC1. Therefore, the first fuse 25 is also used to blow in the event of a short circuit at LVDC2, isolating the short-circuit fault at LVDC2 and preventing the short-circuit fault from propagating to the control circuit 24, thereby reducing the failure rate of the control circuit 24.

[0070] When a short circuit occurs in the control circuit 24, the first fuse 25 will blow to isolate the fault in the control circuit 24, preventing the fault in the control circuit 24 from spreading to the first low-voltage DC port LVDC1 and its connected integrated converter circuit 21, thus reducing the failure rate of the first low-voltage DC port LVDC1 and the integrated converter circuit 21. The short circuit in the control circuit 24 can be caused by a short circuit within itself, or by a short circuit in the active switch 23 that spreads to the control circuit 24.

[0071] like Figure 6 As shown above, Figure 5The vehicle-mounted power supply device 2 shown also includes a control circuit 26 and a second fuse 27 integrated with a conversion circuit 21. The control circuit 26 is connected to the second low-voltage DC port LVDC2 and the low-voltage battery 42 via the second fuse 27. The second fuse 27 is designed to blow in the event of a short circuit in any of the following: the second low-voltage DC port LVDC2, the low-voltage battery 42, or the interface DC5 through which the low-voltage battery 42 supplies power to the control circuit 26. For example, when any short circuit occurs and the current at any of these ports is greater than or equal to a third preset current value, the second fuse 27 blows when the current at any of these ports is greater than or equal to the third preset current value. This isolates the short-circuit fault to prevent it from spreading to the control circuit 26, thereby reducing the failure rate of the control circuit 26.

[0072] like Figure 6 As shown, the control circuit 26 includes a voltage conversion circuit 261, which is connected to the second low-voltage DC port LVDC2 and the low-voltage battery 42 via a second fuse 27. When the power or voltage required by the voltage conversion circuit 261 exceeds a preset threshold, the voltage conversion circuit 261 converts the voltage output from the second low-voltage DC port LVDC2 or the low-voltage battery 42 via the second fuse 27 and supplies power to the drive circuit (not shown) corresponding to the control circuit 26. The preset threshold can be determined by electronic components inside the vehicle power supply device 2. The drive circuit amplifies the switching control signal output from the control circuit 26 and outputs it to the integrated converter circuit 21 to enable the integrated converter circuit 21 to perform voltage conversion. In addition, the voltage conversion circuit 261 also supplies power to the sampling circuit, protection circuit, and other circuits corresponding to the control circuit 26. The sampling circuit is used to collect the electrical parameters of the integrated converter circuit 21, and the protection circuit is used to provide protection to the integrated converter circuit 21. When the integrated converter circuit 21 experiences a short circuit, the short circuit fault in the integrated converter circuit 21 will propagate step by step to the voltage conversion circuit 261, thereby causing a short circuit in the voltage conversion circuit 261. At this time, the aforementioned second fuse 27 is also used to melt and isolate the short circuit fault in the voltage conversion circuit 261 in the event of a short circuit, thereby preventing the short circuit fault in the voltage conversion circuit 261 from propagating to the second low-voltage DC port LVDC2 and the low-voltage battery 42 and causing them to fail, thus improving the power supply reliability of the second low-voltage DC port LVDC2 and the low-voltage battery 42.

[0073] like Figure 6As shown, the control circuit 26 further includes a power management chip 262 and a first chip 263. The first chip 263 is connected to the second low-voltage DC port LVDC2 and the low-voltage battery 42 through the power management chip 262. For example, the first chip 263 may be a digital signal processing (DSP) chip. The power management chip 262 is used to perform voltage conversion on the voltage output from the second low-voltage DC port LVDC2 or the low-voltage battery 42 and supply power to the first chip 263. Further, the first chip 263 is used to receive power from the power management chip 262 and control the integrated conversion circuit 21 to perform voltage conversion.

[0074] When the integrated conversion circuit 21 malfunctions, the fault propagates to the corresponding first chip 263, causing a change in the electrical parameters of the power management chip 262. At this time, the power management chip 262 determines that the first chip 263 has malfunctioned if its electrical parameters are within a first preset parameter range. The electrical parameters of the power management chip 262 include output voltage or output current. It can be understood that the output voltage and output current of the power management chip 262 are the same as the input voltage and input current of the first chip 263, respectively. Therefore, the magnitude of the electrical parameters of the power management chip 262 can be used to determine whether the first chip 263 has malfunctioned. For example, when the electrical parameters include output voltage, the first preset parameter range is greater than or equal to a preset overvoltage value of the power management chip 262, thus determining that the first chip 263 has an overvoltage fault. When the electrical parameters include output voltage, the first preset parameter range is less than or equal to a preset undervoltage value of the power management chip 262, thus determining that the first chip 263 has an undervoltage fault. When the electrical parameters include the output current, the first preset parameter range is greater than or equal to the preset short-circuit current value of the power management chip 262, thereby determining that the first chip 263 has a short-circuit fault.

[0075] When the power management chip 262 meets the requirements of a certain automotive safety integrity level (ASIL), such as ASILD, the power management chip 262 has over / under voltage protection and short circuit protection functions. In this case, the power management chip 262 is also used to stop output in the event of a failure in the first chip 263. That is, the power management chip 262 enters a safe state to isolate the failure of the first chip 263, thereby preventing the failure of the first chip 263 from spreading to the second low-voltage DC port LVDC2 and the low-voltage battery 42, thus improving the power supply reliability of the second low-voltage DC port LVDC2 and the low-voltage battery 42.

[0076] When the power or voltage required by the voltage conversion circuit 261 is less than a preset threshold, the power management chip 262 is also used to convert the voltage output from the second low-voltage DC port LVDC2 or the low-voltage battery 42 and supply power to the voltage conversion circuit 261. Further, the voltage conversion circuit 261 receives power from the power management chip 262, performs voltage conversion, and supplies power to the drive circuit corresponding to the control circuit 26.

[0077] When the integrated converter circuit 21 fails, the fault propagates cascading to the voltage converter circuit 261, causing changes in its electrical parameters. At this time, the power management chip 262 further determines that the voltage converter circuit 261 has failed if its electrical parameters fall within a second preset parameter range. The electrical parameters of the voltage converter circuit 261 include either output voltage or input current. For example, when the electrical parameters include output voltage, the second preset parameter range is greater than or equal to a preset overvoltage value of the voltage converter circuit 261, thus determining that the voltage converter circuit 261 has experienced an overvoltage fault. When the electrical parameters include output voltage, the second preset parameter range is less than or equal to a preset undervoltage value of the voltage converter circuit 261, thus determining that the voltage converter circuit 261 has experienced an undervoltage fault. When the electrical parameters include input current, the second preset parameter range is greater than or equal to a preset short-circuit current value of the voltage converter circuit 261, thus determining that the voltage converter circuit 261 has experienced a short-circuit fault.

[0078] When the power management chip 262 has over- and under-voltage protection and short-circuit protection functions, the power management chip 262 is also used to stop the output in the event of a fault in the voltage conversion circuit 261. That is, the power management chip 262 will enter a safe state to isolate the fault in the voltage conversion circuit 261, thereby preventing the fault in the voltage conversion circuit 261 from spreading to the second low-voltage DC port LVDC2 and the low-voltage battery 42 and causing them to fail, thus improving the power supply reliability of the second low-voltage DC port LVDC2 and the low-voltage battery 42.

[0079] like Figure 6 As shown, a combining power supply circuit can also be provided between the second fuse 27 or power management chip 262 and the second low-voltage DC port LVDC2 and low-voltage battery 42. This combining power supply circuit can be composed of at least one of a diode and a switch. For example, when the combining power supply circuit is composed of a diode, its circuit structure can be as follows: Figure 5 As shown, the combined power supply circuit 20 includes diodes D1 and D2. Diode D1 is connected between the low-voltage battery 42, the second fuse 27, and the power management chip 262, while diode D2 is connected between the second low-voltage DC port LVDC2, the second fuse 27, and the power management chip 262.

[0080] When the low-voltage battery 42 and its line a connecting diode D1, the interface dc5 (such as KL30) supplying power to the control circuit 26 from the low-voltage battery 42, the second low-voltage DC port LVDC2 and its line b connecting diode D2 are functioning correctly, the output voltages of the low-voltage battery 42 and the second low-voltage DC port LVDC2 are the same, meaning the anode voltages of diode D1 and D2 are the same. At this time, both diodes D1 and D2 are conducting, and without considering the forward voltage drop of the diodes, the voltage at point e will be raised to near the anode voltages of diodes D1 and D2. When any one of the following fails—the low-voltage battery 42, line a, interface dc5, the second low-voltage DC port LVDC2, or line b—such as a failure of the low-voltage battery 42, line a, or interface dc5, the anode voltage of diode D1 will drop to below the voltage at point e or even equal to 0, while the anode voltage of diode D2 remains unchanged. At this time, diode D1 is turned off to isolate the faulty low-voltage battery 42, line a, or interface DC5, thereby preventing the fault from propagating to the control circuit 26 and causing it to fail, thus reducing the failure rate of the control circuit 26. Diode D2 remains on to output the second output voltage Vout2 from the second low-voltage DC port LVDC2 to the control circuit 26, ensuring the normal operation of the control circuit 26 and improving the control reliability of the integrated converter circuit 21. When the second low-voltage DC port LVDC2 or line b fails, diode D1 remains on to output the voltage from the low-voltage battery 42 to the control circuit 26, and diode D1 is turned off to isolate the faulty second low-voltage DC port LVDC2 or line b.

[0081] Among them, a fault occurring in any of the low-voltage battery 42, line a, interface dc5, second low-voltage DC port LVDC2, and line b can be a short-circuit fault, overvoltage fault, undervoltage fault, or open-circuit fault. Furthermore, the cause of any of these faults can be a fault in itself or a fault in other components of the on-board power supply device 2 that has spread.

[0082] By implementing the embodiments of this application, when any one of the low-voltage battery 42, line a, interface dc5, second low-voltage DC port LVDC2, and line b fails, the control circuit 26 can continue to be powered through the non-faulty low-voltage battery 42 or the second low-voltage DC port LVDC2 via the combined power supply circuit 20 to ensure the normal operation of the control circuit 26. This avoids the situation where the control circuit 26 cannot continue to control the integrated conversion circuit 21 to perform voltage conversion due to the failure of the low-voltage battery 42, thereby improving the control reliability of the integrated conversion circuit 21.

[0083] like Figure 6 As shown above, Figure 5The on-board power supply device 2 shown also includes a control circuit 28 and a third fuse 29 for the DC-DC converter circuit 22. The control circuit 28 is connected to the second low-voltage DC port LVDC2 and the low-voltage battery 42 via the third fuse 29. The third fuse 29 is designed to blow in the event of a short circuit in any of the following: the second low-voltage DC port LVDC2, the low-voltage battery 42, or the interface DC5 through which the low-voltage battery 42 supplies power to the control circuit 28. This isolates the short-circuit fault to prevent it from spreading to the control circuit 28, thereby reducing the failure rate of the control circuit 28.

[0084] like Figure 6 As shown, the control circuit 28 includes a voltage conversion circuit 281, a power management chip 282, and a second chip 283. For example, the second chip 283 can be a digital signal processing (DSP) chip. The first chip 263 and the second chip 283 are two independent chips. Optionally, the first chip 263 and the second chip 283 can also be integrated into a single chip, that is, the integrated conversion circuit 21 and the DC-DC conversion circuit 22 are controlled by the same chip. Specifically, the voltage conversion circuit 281 is connected to the second low-voltage DC port LVDC2 and the low-voltage battery 42 via a third fuse 29, and the second chip 283 is connected to the second low-voltage DC port LVDC2 and the low-voltage battery 42 via the power management chip 282. It is understood that the specific implementation methods and corresponding beneficial effects of the functions of voltage conversion circuit 281, power management chip 282 and the second chip 283, the third fuse 29 for isolating voltage conversion circuit 281 from faults, the power management chip 282 for isolating the second chip 283 from faults, and the power management chip 262 for isolating voltage conversion circuit 261 from faults can be found in the above description of the specific implementation methods and corresponding beneficial effects of the functions of voltage conversion circuit 261, power management chip 262 and the first chip 263, the second fuse 27 for isolating voltage conversion circuit 261 from faults, the power management chip 262 for isolating the first chip 263 from faults, and the power management chip 262 for isolating voltage conversion circuit 261 from faults. These will not be repeated here.

[0085] like Figure 6As shown, a combined power supply circuit 20 can also be provided between the third fuse 29 or power management chip 282 and the second low-voltage DC port LVDC2 and the low-voltage battery 42. In the combined power supply circuit 20, diode D1 is connected between the low-voltage battery 42 and the third fuse 29 and power management chip 282, and diode D2 is connected between the second low-voltage DC port LVDC2 and the third fuse 29 and power management chip 282. When the low-voltage battery 42, line a, or interface DC5 fails, diode D1 is turned off to isolate the faulty low-voltage battery 42, line a, or interface DC5, thereby preventing the fault from propagating to the control circuit 28 and causing it to fail, thus reducing the failure rate of the control circuit 28. Diode D2 remains in the conducting state to output the second output voltage Vout2 from the second low-voltage DC port LVDC2 to the control circuit 28, thereby ensuring the normal operation of the control circuit 28. When the second low-voltage DC port LVDC2 or line b fails, diode D1 remains conducting to output the voltage from the low-voltage battery 42 to the control circuit 28, and diode D1 is turned off to isolate the faulty second low-voltage DC port LVDC2 or line b. Implementing this embodiment avoids the situation where the control circuit 28 cannot continue to control the DC-DC converter circuit 22 to perform voltage conversion due to a failure of the low-voltage battery 42, thereby improving the control reliability of the DC-DC converter circuit 22.

[0086] according to Figure 6 In the corresponding embodiment, the integrated conversion circuit 21 is controlled by the first chip 263 for voltage conversion, and the DC-DC conversion circuit 22 is controlled by the second chip 283 for voltage conversion. That is, both the integrated conversion circuit 21 and the DC-DC conversion circuit 22 are controlled by independent chips. When one of the chips, the first chip 263 and the second chip 283, fails, it will not interfere with the control of the corresponding conversion circuit by the other chip, thus improving the control reliability of the vehicle power supply device 2. Furthermore, single-point faults in the vehicle power supply device 2 can be isolated, ensuring that cascading failures caused by single-point faults do not couple to other components or circuits (such as the combined power supply circuit 20), thereby improving the power supply reliability of the control circuits 26 and 28, and consequently improving the control reliability of the vehicle power supply device 2.

[0087] For example, one circuit topology of the vehicle power supply device 2 can be as follows: Figure 7 As shown above, Figure 6The integrated converter circuit 21 shown includes a power factor correction circuit 211 and a DC-DC converter circuit 212. The DC-DC converter circuit 212 includes switches Q1 to Q8, bus capacitor Cbus, capacitors C1 to C3, inductor L1, transformer T1, switches Q9 to Q12, capacitors C4 and C5, and inductor L2. The transformer T1 is a three-port transformer, and it includes windings Z1, Z2, and Z3.

[0088] In this circuit, the AC terminal of the power factor correction circuit 211 is connected to the AC terminal ac1 of the integrated converter circuit 21. Switches Q1 and Q2 are connected in series to the DC terminal of the power factor correction circuit 211, as are switches Q3 and Q4. The two ends of the bus capacitor Cbus are connected to the DC terminal of the power factor correction circuit 211. The series connection point of switches Q1 and Q2 is connected to one end of winding Z1 via capacitor C1 and inductor L1, and the series connection point of switches Q3 and Q4 is connected to the other end of winding Z1. One end of winding Z2 is connected to the series connection point of switches Q5 and Q6 via capacitor C2, and the other end of winding Z2 is connected to the series connection point of switches Q7 and Q8. Switches Q5 and Q6 are connected in series to the first DC terminal dc1 of the integrated converter circuit 21, as are switches Q7 and Q8. The two ends of capacitor C3 are connected to the first DC terminal dc1 of the integrated converter circuit 21. The first end of winding Z3 is connected via switch Q9 to the source of switch Q10, one end of capacitor C4, the source of switch Q12, one end of capacitor C5, the negative connection terminal of the second DC terminal dc2 of integrated converter circuit 21, and the first negative terminal LVDC1-. The second end of winding Z3 is connected to the other end of capacitor C4 and the drain of switch Q11. The source of switch Q11 and the drain of switch Q12 are connected via inductor L2 to the other end of capacitor C5, the positive connection terminal of the second DC terminal dc2, and the first positive terminal LVDC1+. The third end of winding Z3 is connected to the drain of switch Q10.

[0089] When the AC terminal ac1 of the integrated converter circuit 21 is connected to the AC power supply 31, the first chip 263 controls the power factor correction circuit 211 to convert the AC supply voltage output by the AC power supply 31 and output a DC voltage to the DC converter circuit 212. The first chip 263 also controls the switches Q1 to Q8 to turn on or off, so that the DC converter circuit 212 converts the DC voltage output by the power factor correction circuit 211 into a DC charging voltage and outputs it to the high-voltage DC port HVDC to charge the power battery 41. The aforementioned bus capacitor Cbus is used to mitigate or eliminate fluctuations in the DC voltage output by the power factor correction circuit 211, and capacitors C1 to C3 are used to mitigate or eliminate fluctuations in the DC charging voltage. The first chip 263 also controls the switches Q1 to Q4 and Q9 to Q12 to turn on or off, so that the DC converter circuit 212 converts the DC voltage output by the power factor correction circuit 211 into a first output voltage Vout1 and outputs it to the first low-voltage DC port LVDC1. The capacitors C4 and C5 mentioned above are used to reduce or eliminate fluctuations in the first output voltage Vout1.

[0090] When the AC terminal ac1 of the integrated converter circuit 21 is used to connect the AC load 32, the first chip 263 controls the switches Q1 to Q8 to turn on or off, so that the DC-DC converter circuit 212 converts the DC supply voltage output from the power battery 41 and outputs a DC voltage to the power factor correction circuit 211. Capacitors C1 to C3 are used to reduce or eliminate fluctuations in the DC supply voltage, and the bus capacitor Cbus is used to reduce or eliminate fluctuations in the DC voltage output by the DC-DC converter circuit 212. The first chip 263 also controls the power factor correction circuit 211 to invert the DC voltage output by the DC-DC converter circuit 212 into a first AC voltage to supply power to the AC load 32. The first chip 263 also controls the switches Q5 to Q12 to turn on or off, so that the DC-DC converter circuit 212 converts the DC supply voltage output from the power battery 41 into a first output voltage Vout1 and outputs it to the first low-voltage DC port LVDC1. Capacitors C4 and C5 are used to reduce or eliminate fluctuations in the first output voltage Vout1. At this time, the first low-voltage DC port LVDC1 can supply power to the first DC load 51, the second DC load 52, and the low-voltage battery 42.

[0091] When the first low-voltage DC port LVDC1 receives the first output voltage Vout1 from the DC-DC converter circuit 212, the first low-voltage DC port LVDC1 can supply power to the first DC load 51 and the low-voltage battery 42, and supply power to the second DC load 52 when the active switch 23 is turned on.

[0092] It is understood that the power factor correction circuit 211, switches Q1 to Q8, bus capacitor Cbus, capacitors C1 to C3, inductor L1, and transformer T1 constitute the original on-board charger (OBC) conversion circuit of the vehicle power supply device 2. This embodiment adds switches Q9 to Q12, capacitors C4 and C5, and inductor L2 to the OBC conversion circuit to output the first output voltage Vout1 to the first low-voltage DC port LVDC1, thereby enabling the supply of power to the first DC load 51, the second DC load 52, and the low-voltage battery 42. In other words, the DC-DC conversion circuit 212 can reuse the transformer T1 in the OBC conversion circuit and integrate it with the original OBC conversion circuit, eliminating the need to add a separate DC / DC conversion circuit as the DC-DC conversion circuit 212. This results in lower cost and smaller size for the vehicle power supply device 2.

[0093] like Figure 7 As shown above, Figure 6 The DC-DC converter circuit 22 shown includes capacitors C6 to C8, switches Q13 to Q16, transformer T2, and inductor L3. Transformer T2 includes windings Z4 and Z5. Capacitors C6 and C7 are connected in series to the first DC terminal dc3 of the DC-DC converter circuit 22. Switches Q13 and Q14 are also connected in series to the first DC terminal dc3 of the DC-DC converter circuit 22. The series connection point of capacitors C6 and C7 is connected to one end of winding Z4, and the series connection point of switches Q13 and Q14 is connected to the other end of winding Z4. The first end of winding Z5 is connected via switch Q15 to the source of switch Q16, one end of capacitor C8, the negative terminal of the second DC terminal dc4 of the DC-DC converter circuit 22, and the second negative terminal LVDC2-. The second end of winding Z5 is connected via inductor L3 to the other end of capacitor C8, the positive terminal of the second DC terminal dc4, and the second positive terminal LVDC2+. The third terminal of winding Z5 is connected to the drain of switch Q16. The second chip 283 controls the switching on or off of each switch from Q13 to Q16, so that the DC-DC converter circuit 22 converts the DC supply voltage output from the power battery 41 into a second output voltage Vout2, which is then output to the second low-voltage DC port LVDC2. Capacitors C6 and C7 are used to mitigate or eliminate fluctuations in the DC supply voltage, and also to mitigate or eliminate fluctuations in the second output voltage Vout2. At this time, the second low-voltage DC port LVDC2 can supply power to the second DC load 52, and when the active switch 23 is turned on, it supplies power to the first DC load 51 and the low-voltage battery 42.

[0094] Understandable. Figure 7The circuit topology of the vehicle power supply device 2 shown is only an example, and the embodiments of this application do not limit the circuit topology of the vehicle power supply device 2.

[0095] By implementing the embodiments of this application, it is not necessary to add two independent DC-DC converter circuits to the original OBC converter circuit to supply power to the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2 respectively, which greatly reduces the cost of the vehicle power supply device 2 and reduces the size of the vehicle power supply device 2.

[0096] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A vehicle-mounted power supply device, characterized in that, The on-board power supply device is used to provide a first output voltage or a second output voltage to the vehicle's DC load and the vehicle's low-voltage battery, and the on-board power supply device includes: The AC port is used to receive the AC supply voltage from the AC power source and to output the first AC voltage to the AC load. A high-voltage DC port is used to receive the DC supply voltage output from the power battery in the vehicle and to output a DC charging voltage to the power battery, wherein the DC supply voltage output by the power battery is greater than the first output voltage and the second output voltage. A first low-voltage DC port is used to output the first output voltage to a first DC load in the vehicle and the low-voltage battery; The second low-voltage DC port is used to output the second output voltage to the second DC load in the vehicle; The on-board power supply device is used to receive the DC power supply voltage output by the power battery through the high-voltage DC port and output the first output voltage through the first low-voltage DC port and the second output voltage through the second low-voltage DC port; The first low-voltage DC port is also used to output the first output voltage to the second DC load when the vehicle power supply device fails and the second low-voltage DC port cannot output the second output voltage; The second low-voltage DC port is also used to output the second output voltage to the first DC load and the low-voltage battery when the vehicle power supply device malfunctions and the first low-voltage DC port cannot output the first output voltage.

2. The vehicle-mounted power supply device according to claim 1, characterized in that, The vehicle-mounted power supply device also includes: An integrated conversion circuit is used to receive the AC supply voltage output by the AC power source through the AC port and convert it into the DC charging voltage and output it to the high-voltage DC port; the integrated conversion circuit is used to receive the AC supply voltage output by the AC power source through the AC port and convert it into the first output voltage and output it to the first low-voltage DC port; the integrated conversion circuit is used to receive the DC supply voltage output by the power battery through the high-voltage DC port and convert it into the first AC voltage and output it to the AC port; the integrated conversion circuit is used to receive the DC supply voltage output by the power battery through the high-voltage DC port and convert it into the first output voltage and output it to the first low-voltage DC port. A DC-DC converter circuit is used to receive the DC power supply voltage output by the power battery through the high-voltage DC port and convert it into the second output voltage to be output to the second low-voltage DC port.

3. The vehicle-mounted power supply device according to claim 2, characterized in that, The on-board power supply device is used to utilize the integrated conversion circuit and the DC-DC conversion circuit according to the vehicle state change, wherein: When the vehicle is in motion, the DC-DC converter circuit is used to output the second output voltage to the second low-voltage DC port to supply power to the second DC load. When the vehicle is in motion, and the DC-DC converter circuit fails and cannot output the second output voltage to the second low-voltage DC port, the integrated converter circuit is used to output the first output voltage to the first low-voltage DC port to supply power to the second DC load. When the vehicle is parked, the integrated conversion circuit is used to output the DC charging voltage to the high-voltage DC port to charge the power battery and to output the first output voltage to the first low-voltage DC port to power the first DC load and the low-voltage battery; or the integrated conversion circuit is used to output the first AC voltage to the AC port to power the AC load and to output the first output voltage to the first low-voltage DC port to power the first DC load and the low-voltage battery. When the vehicle is parked, and the integrated conversion circuit malfunctions and cannot output the DC charging voltage to the high-voltage DC port to charge the power battery and cannot output the first output voltage to the first low-voltage DC port to power the first DC load and the low-voltage battery, the DC conversion circuit is used to output the second output voltage to the second low-voltage DC port to power the first DC load and the low-voltage battery. Alternatively, when the integrated conversion circuit malfunctions and cannot output the first AC voltage to the AC port to power the AC load and cannot output the first output voltage to the first low-voltage DC port to power the first DC load and the low-voltage battery, the DC conversion circuit is used to output the second output voltage to the second low-voltage DC port to power the first DC load and the low-voltage battery.

4. The vehicle-mounted power supply device according to claim 2 or 3, characterized in that, The vehicle-mounted power supply device further includes an active switch. The first low-voltage DC port includes a first positive port, and the second low-voltage DC port includes a second positive port. The active switch is used to connect the first positive port of the first low-voltage DC port and the second positive port of the second low-voltage DC port. The active switch is used to turn on or off the electrical connection between the first low-voltage DC port and the second low-voltage DC port.

5. The vehicle-mounted power supply device according to claim 4, characterized in that, The active switch includes two semiconductor field-effect transistors (FETs) with their drains connected together. The two FETs are connected in series between the first positive port and the second positive port. The FETs are used to receive commands to control the electrical connection between the first low-voltage DC port and the second low-voltage DC port.

6. The vehicle-mounted power supply device according to claim 4 or 5, characterized in that, The vehicle is in driving, charging, and discharging states, the active switch is in the ON state, and the electrical connection between the first low-voltage DC port and the second low-voltage DC port is connected.

7. The vehicle-mounted power supply device according to any one of claims 4-6, characterized in that, The vehicle-mounted power supply device is used for: When the vehicle is in driving, charging, or discharging state, and the active switch connects the first low-voltage DC port and the second low-voltage DC port, at most one of the integrated conversion circuit and the DC-DC conversion circuit performs voltage conversion.

8. The vehicle-mounted power supply device according to any one of claims 4-6, characterized in that, The vehicle-mounted power supply device is used for: When the vehicle is in driving, charging, or discharging state, and the active switch disconnects the electrical connection between the first low-voltage DC port and the second low-voltage DC port, at least one of the integrated conversion circuit and the DC-DC conversion circuit performs voltage conversion.

9. The vehicle-mounted power supply device according to any one of claims 4-8, characterized in that, The vehicle-mounted power supply device also includes a first fuse. The control circuit of the active switch is connected to the first low-voltage DC port through the first fuse. The first fuse is used to blow in the event of a short circuit in the first low-voltage DC port or to blow in the event of a short circuit in the active switch.

10. The vehicle-mounted power supply device according to claim 9, characterized in that, The first fuse is also designed to blow in the event of a short circuit at the second low-voltage DC port.

11. The vehicle-mounted power supply device according to any one of claims 2-10, characterized in that, The vehicle power supply device also includes a second fuse. The control circuit of the integrated converter circuit is connected to the second low-voltage DC port and the low-voltage battery through the second fuse. The second fuse is used to blow in the event of a short circuit in any of the second low-voltage DC port, the low-voltage battery, and the interface through which the low-voltage battery supplies power to the control circuit of the integrated converter circuit.

12. The vehicle-mounted power supply device according to any one of claims 2-11, characterized in that, The vehicle power supply device also includes a third fuse. The control circuit of the DC-DC converter is connected to the second low-voltage DC port and the low-voltage battery through the third fuse. The third fuse is used to blow in the event of a short circuit in any of the second low-voltage DC port, the low-voltage battery, and the interface through which the low-voltage battery supplies power to the control circuit of the integrated converter.

13. The vehicle-mounted power supply device according to any one of claims 1-12, characterized in that, The first low-voltage DC port includes a first negative port, and the second low-voltage DC port includes a second negative port. The first negative port is connected to the second negative port.

14. The vehicle-mounted power supply device according to any one of claims 2-12, characterized in that, The vehicle-mounted power supply device also includes: The first chip is used to control the integrated conversion circuit to perform voltage conversion. The second chip is used to control the DC-DC converter circuit to perform voltage conversion.

15. A powertrain, characterized in that, The powertrain includes a drive motor and an on-board power supply device as described in any one of claims 1-14. The on-board power supply device includes an inverter circuit, which receives the DC power supply voltage output by the power battery through the high-voltage DC port and converts it into a three-phase AC voltage to drive the drive motor.

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