Vehicle-mounted power supply device and power assembly

Abstract

The invention provides a vehicle-mounted power supply device and a power assembly. In the vehicle-mounted power supply device, an alternating-current port receives alternating-current power supply voltage output by an alternating-current power supply and outputs first alternating-current voltage to an alternating-current load, and a high-voltage direct-current port receives direct-current power supply voltage output by a power battery and outputs direct-current charging voltage to the power battery. The first low-voltage direct-current port outputs a first output voltage to the first direct-current load and the low-voltage battery, and the second low-voltage direct-current port outputs a second output voltage to the second direct-current load. When the second low-voltage direct-current port cannot output the second output voltage, the first low-voltage direct-current port outputs the first output voltage to the second direct-current load, and when the first low-voltage direct-current port cannot output the first output voltage, the second low-voltage direct-current port outputs the second output voltage to the first direct-current load and the low-voltage battery. The power consumption of the vehicle-mounted power supply device is reduced, and the size of the vehicle-mounted power supply device is reduced.

Description

Technical Field

[0001] The present application relates to the field of vehicle-mounted charging, and in particular to a vehicle-mounted power supply device and a power assembly. Background Art

[0002] In order to meet the demand for low-voltage redundant power supply for the whole vehicle, the vehicle usually adopts a dual battery system to provide low-voltage power supply to different low-voltage loads in the vehicle. For example, the low-voltage load can be an electromechanical braking system (EMB for short), a wire-controlled steering component, and a wire-controlled brake component. At present, two low-voltage batteries are usually arranged inside the dual-battery system to realize redundant power supply for low-voltage load 1 and low-voltage load 2. However, the structural design of the dual-battery system is too complicated, resulting in high power consumption and large size of the dual-battery system. Summary of the invention

[0003] The present application provides a vehicle-mounted power supply device and a power assembly, which can avoid the use of two low-voltage batteries in the vehicle-mounted power supply device. The vehicle-mounted power supply device has a simple structural design and a flexible redundant power supply method, thereby reducing the power consumption of the vehicle-mounted power supply device and reducing the size of the vehicle-mounted power supply device.

[0004] In the first aspect, an embodiment of the present application provides a vehicle-mounted power supply device, which is used to provide a first output voltage or a second output voltage to a DC load of a vehicle and a low-voltage battery of the vehicle. The vehicle-mounted power supply device includes an AC port, a high-voltage DC port, a first low-voltage DC port for redundant backup, and a second low-voltage DC port for redundant backup. Among them, the AC port is used to receive the AC power supply voltage output by the AC power source and output the first AC voltage to the AC load. The high-voltage DC port is used to receive the DC power supply voltage output by the power battery in the vehicle and output the DC charging voltage to the power battery, wherein the DC power 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 the first DC load and the low-voltage battery in the vehicle. The second low-voltage DC port is used to output the second output voltage to the second DC load in the vehicle. The vehicle-mounted 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 output 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-mounted 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-mounted power supply device fails and the first low-voltage DC port cannot output the first output voltage.

[0005] The above-mentioned vehicle-mounted 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, so as to realize redundant power supply of 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. The first output voltage and the second output voltage are in a backup relationship with each other. When the vehicle-mounted power supply device fails 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. When the vehicle-mounted power supply device fails 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, thereby ensuring the power supply safety of the first DC load, the second DC load and the low-voltage battery. By implementing the embodiments of the present 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. During this redundant power supply process, the use of two low-voltage batteries in the vehicle power supply device can be avoided. 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 a possible implementation, the vehicle-mounted power supply device further includes an integrated conversion circuit and a DC conversion circuit. When the AC port is used to connect an AC power source, the integrated conversion circuit is used to receive the AC power supply voltage output by the AC power source through the AC port and convert it into a DC charging voltage and output it to the high-voltage DC port. The integrated conversion circuit is also used to receive the AC power supply voltage output by the AC power source through the AC port and convert it into a first output voltage and output it to the first low-voltage DC port, so that the first low-voltage DC port supplies power to the first DC load, the second DC load and the low-voltage battery. When the AC port is used to connect an AC load, the integrated conversion 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 a first AC voltage and output it to the AC port. The integrated conversion circuit is also used to receive the DC power supply voltage output by the power battery through the high-voltage DC port and convert it into a first output voltage and output it to the first low-voltage DC port, so that the first low-voltage DC port supplies power to the first DC load, the second DC load and the low-voltage battery. The DC conversion 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 a second output voltage and output it to the second low-voltage DC port, so that the second low-voltage DC port supplies power to the first DC load, the second DC load and the low-voltage battery. By implementing the embodiments of the present application, the existing dual power supply system can be replaced by an integrated conversion circuit and a DC conversion circuit to achieve low-voltage redundant power supply for the first DC load, the second DC load and the low-voltage battery, thereby avoiding the use of two low-voltage batteries in the vehicle power supply device, thereby reducing the cost of the vehicle power supply device and reducing the size of the vehicle power supply device.

[0007] In a possible implementation, the above-mentioned on-board power supply device is used to use the integrated conversion circuit and the DC conversion circuit according to the vehicle state transformation. When the vehicle is in the driving state, the DC conversion circuit is used to output the second output voltage to the second low-voltage DC port to supply power to the second DC load. At this time, the DC conversion circuit is the main power supply circuit, and the integrated conversion circuit is the backup power supply circuit. The backup power supply circuit in the embodiment of the present application is used to provide power supply in the event of a failure in the main power supply circuit. When the vehicle is in the driving state, the DC conversion circuit has a short circuit or open circuit and other faults that affect the power supply and cannot output the second output voltage to the second low-voltage DC port, and the integrated conversion circuit is used to output the first output voltage to the first low-voltage DC port to supply power to the second DC load. At this time, the integrated conversion circuit is the main power supply circuit, and the DC conversion circuit is the backup power supply circuit. When the vehicle is in the parking state, and the AC port is used to connect to the AC power supply, the integrated conversion circuit is used to output the DC charging voltage to the high-voltage DC port to charge the power battery, and output the 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 the charging state, the integrated conversion circuit is the main power supply circuit and the DC conversion circuit is the backup power supply circuit. When the vehicle is in a parking state and the AC port is used to connect an AC load, the integrated conversion circuit is used to output a first AC voltage to the AC port to supply power to the AC load, and output 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 discharging state, the integrated conversion circuit is the main power supply circuit, and the DC conversion circuit is the backup power supply circuit. When the vehicle is in a parking state and the AC port is used to connect an AC power source, the integrated conversion circuit has a short circuit or open circuit or other faults that affect the power supply and cannot output a DC charging voltage to the high-voltage DC port to charge the power battery, and cannot output a first output voltage to the first low-voltage DC port to supply power to the first DC load and the low-voltage battery. The above-mentioned DC conversion circuit is 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-charging state, the DC conversion circuit is the main power supply circuit, and the integrated conversion circuit is the backup power supply circuit. When the vehicle is in a parking state and the AC port is used to connect an AC load, the integrated conversion circuit has a short circuit or open circuit or other faults that affect power supply and cannot output the first AC voltage to the AC port to supply power to the AC load, and cannot output 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 above-mentioned DC conversion circuit is used to output the 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, the DC conversion circuit is the main power supply circuit and the integrated conversion circuit is the backup power supply circuit.By implementing the embodiments of the present application, different conversion circuits can be flexibly switched according to the actual vehicle status to serve as the main power supply circuit and the backup power supply circuit for power supply, respectively. The power supply flexibility of the first DC load, the second DC load and the low-voltage battery is stronger, and the power consumption of the vehicle power supply device is reduced.

[0008] In a possible implementation, the above-mentioned vehicle-mounted power supply device also 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. Among them, 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, and 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. By implementing the embodiment of the present application, the switching state of the active switch can be flexibly controlled to meet the different power supply requirements of the vehicle-mounted power supply device. In addition, the existing dual power supply system can be replaced by an integrated conversion circuit, a DC conversion circuit and an active switch, thereby avoiding the use of two low-voltage batteries in the vehicle-mounted power supply device, thereby reducing the cost of the vehicle-mounted power supply device and reducing the volume of the vehicle-mounted power supply device.

[0009] In a possible implementation, the active switch includes two semiconductor field effect transistors, wherein the drains of the two semiconductor field effect transistors are connected, and the two semiconductor field effect transistors are connected in series between the first positive port and the second positive port. The semiconductor field effect transistor is used to receive instructions to control the electrical connection between the first low-voltage DC port and the second low-voltage DC port, wherein the instructions can be issued by the control circuit of the active switch. In the implementation of the embodiment of the present application, when the two semiconductor field effect transistors are turned on, the first DC load, the second DC load and the low-voltage battery can be powered through any one of the first low-voltage DC port and the second low-voltage DC port, and the power supply flexibility of the on-board power supply device is stronger. In addition, the active switch can also form a current isolation when there is a fault between the first positive port and the second positive port to protect the circuit.

[0010] In a possible implementation, when the vehicle is in a driving state, a charging state, and a discharging state, the active switch is in an on state, and the electrical connection between the first low-voltage DC port and the second low-voltage DC port is conducted. By implementing the embodiment of the present application, when the vehicle is in any of the driving state, the charging state, and the discharging state, power can be supplied to the first DC load, the second DC load, and the low-voltage battery through any of the first low-voltage DC port and the second low-voltage DC port, and the power supply efficiency of the vehicle-mounted power supply device is higher.

[0011] In a possible implementation, the above-mentioned on-board power supply device is used when the vehicle is in a driving state, a charging state, and a discharging state, and the active active switch conducts the electrical connection between the first low-voltage DC port and the second low-voltage DC port, and at most one of the integrated conversion circuit and the DC conversion circuit performs voltage conversion. When implementing the embodiment of the present application, when the main power supply circuit in the integrated conversion circuit and the DC conversion circuit fails, that is, when a single-point failure occurs in the on-board power supply device, 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 a possible implementation, the on-board power supply device is used to convert voltage when the vehicle is in a driving state, a charging state, and a discharging state, and the active switch disconnects the electrical connection between the first low-voltage DC port and the second low-voltage DC port, and at least one of the integrated conversion circuit and the DC conversion circuit performs voltage conversion. In the implementation of the embodiment of the present application, when one of the active switch, the first low-voltage DC port, and the second low-voltage DC port fails, that is, when a single-point failure occurs in the on-board power supply device, at least one of the first low-voltage DC port and the second low-voltage DC port 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.

[0013] In a possible implementation, the vehicle-mounted power supply device further includes a first fuse, and the control circuit of the active active switch is connected to the first low-voltage DC port via the first fuse. The first fuse is used to fuse when a short circuit occurs at the first low-voltage DC port, or to fuse when a short circuit occurs at the active active switch, and can isolate the short circuit fault occurring at the first low-voltage DC port or the active active switch, thereby preventing the short circuit fault from spreading to the control circuit of the active active switch to cause the control circuit of the active active switch to fail, thereby reducing the failure rate of the control circuit of the active active switch.

[0014] In a possible implementation, when a short circuit occurs at the second low-voltage DC port, the short circuit fault of the second low-voltage DC port will spread to the first low-voltage DC port through the active switch, thereby causing a short circuit at the first low-voltage DC port. Therefore, the first fuse is also used to fuse when a short circuit occurs at the second low-voltage DC port, and can isolate the short circuit fault at the second low-voltage DC port, thereby preventing the short circuit fault from spreading to the control circuit of the active switch to cause the control circuit of the active switch to fail, thereby reducing the failure rate of the control circuit of the active switch.

[0015] In a possible implementation, the vehicle-mounted power supply device further includes a second fuse, and the control circuit of the integrated conversion circuit is connected to the second low-voltage DC port and the low-voltage battery via the second fuse. The second fuse is used to fuse when 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 conversion circuit is short-circuited, and the short-circuit fault can be isolated to prevent the short-circuit fault from spreading to the control circuit of the integrated conversion circuit, thereby reducing the failure rate of the control circuit of the integrated conversion circuit.

[0016] In a possible implementation, the vehicle-mounted power supply device further includes a third fuse, and the control circuit of the DC conversion circuit is connected to the second low-voltage DC port and the low-voltage battery through the third fuse. The third fuse is used to fuse when 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 conversion circuit is short-circuited, and the short-circuit fault can be isolated to prevent the short-circuit fault from spreading to the control circuit of the DC conversion circuit, thereby reducing the failure rate of the control circuit of the DC conversion circuit.

[0017] In a possible implementation, the first low-voltage DC port includes a first negative electrode port, and the second low-voltage DC port includes a second negative electrode port, wherein the first negative electrode port is connected to the second negative electrode port. When the embodiment of the present application is implemented, a loop between the first low-voltage DC port and the second low-voltage DC port can be formed when the main power switch is turned on, thereby meeting the demand of supplying power to the first DC load, the second DC load, and the low-voltage battery through any low-voltage DC port.

[0018] In a possible implementation, the vehicle-mounted power supply device further includes a first chip and a second chip. The first chip is used to control the integrated conversion circuit to perform voltage conversion, and the second chip is used to control the DC conversion circuit to perform voltage conversion. In other words, the integrated conversion circuit and the DC conversion circuit are both controlled by independent chips. When implementing the embodiment of the present application, when one of the first chip and the second chip fails, it will not interfere with the other chip controlling the corresponding conversion circuit, and the control reliability of the vehicle-mounted power supply device is higher.

[0019] In the second aspect, an embodiment of the present application provides a powertrain, which includes a drive motor and an on-board power supply device as provided in the first aspect and any one of its possible embodiments, and the on-board power supply device also includes an inverter circuit. The inverter circuit is used to receive the DC supply voltage output by the power battery through the high-voltage DC port and convert it into a three-phase AC voltage output. Among them, the three-phase AC voltage is used to supply the drive motor with working output torque and speed, thereby meeting the driving needs of the vehicle.

[0020] It should be understood that the implementation and beneficial effects of the above-mentioned aspects of the present application can be referenced to each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of a vehicle provided in an embodiment of the present application;

[0022] Figure 2 is a schematic diagram of the electronic control of the powertrain provided in the embodiment of the present application;

[0023] Figure 3 is a structural schematic diagram of a vehicle-mounted power supply device provided in an embodiment of the present application;

[0024] Figure 4 is a circuit diagram of a vehicle-mounted power supply device provided in an embodiment of the present application;

[0025] Figure 5 is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0026] Figure 6 is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0027] Figure 7 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] The implementation of the technical solution of the present application is further described in detail below in conjunction with the accompanying drawings.

[0030] See also Figure 1 , Figure 1 Schematic diagram of the structure of the vehicle provided in the embodiment of the present application. Figure 1 As shown, the vehicle 1 includes a powertrain 11 and a power battery 12, wherein the powertrain 11 includes a drive motor 111 and an on-board power supply device 112, and the on-board power supply device 112 includes a high-voltage DC port 1121 and an inverter circuit 1122. When the powertrain 11 receives DC power supply, the inverter circuit 1122 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 three-phase AC voltage output. Among them, the three-phase AC voltage is used to supply the drive motor 111 with working output torque and speed. At this time, the drive motor 111 can convert electrical energy into mechanical energy and drive the vehicle 1 to travel.

[0031] The electronic control schematic diagram of the powertrain 11 can be 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, and the inverter circuit 1122 includes a capacitor C0 and switch tubes S1 to S6. Among them, the two ends of the capacitor C0 are connected to the high-voltage DC port 1121, the switch tubes S1 and S2 are connected in series and then connected in parallel with the capacitor C0, the switch tubes S3 and S4 are connected in series and then connected in parallel with the capacitor C0, and the switch tubes S5 and S6 are connected in series and then connected in parallel with the capacitor C0. The series connection point of the above-mentioned switch tubes S1 and S2 is connected to the U-phase winding, the series connection point of the switch tubes S3 and S4 is connected to the V-phase winding, and the series connection point of the switch tubes S5 and S6 is connected to the W-phase winding. When the inverter circuit 1122 receives a DC power supply, the capacitor C0 is used to reduce or eliminate the fluctuation of the DC power supply voltage. The switch tubes S1 to S6 are used to invert the DC supply voltage into a three-phase AC voltage and output it to the U-phase winding, the V-phase winding and the W-phase winding, so that the drive motor 111 can work to output torque and speed, thereby driving the vehicle 1 to travel.

[0032] like Figure 2 As shown above Figure 1The vehicle-mounted power supply device 112 shown also includes an integrated conversion circuit 1123 and a DC conversion circuit 1124. When the integrated conversion circuit 1123 receives AC power, the integrated conversion circuit 1123 is used to convert the AC power supply voltage output by the AC power source 13 into a DC charging voltage and output 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 is also used to convert the AC power supply voltage into a first output voltage and supply 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, the integrated conversion circuit 1123 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 first AC voltage to supply power to the AC load 14. The integrated conversion circuit 1123 is also used to convert the DC power 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 above-mentioned DC conversion circuit 1124 is used to receive the DC 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, under the condition 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 a difference of less than 10% as needed, so as to save electric energy, extend the power supply time, and ensure that the voltage backup supply is safer.

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

[0034] See also Figure 3 , Figure 3 Schematic diagram of the structure of the vehicle-mounted power supply device provided in the embodiment of the present application. Figure 3As shown, the vehicle-mounted power supply device 2 is used to provide 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, wherein the vehicle's DC load includes a first DC load 51 and a second DC load 52. Exemplarily, any voltage of the first output voltage Vout1 and the second output voltage Vout2 can be 12V or 48V. The above-mentioned vehicle-mounted power supply device 2 includes an AC port AC, a high-voltage DC port HVDC, a redundant backup first low-voltage DC port LVDC1, and a redundant backup second low-voltage DC port LVDC2. Among them, the AC port AC is used to connect the AC power source 31 or the AC load 32, and the high-voltage DC port HVDC is used to connect the power battery 41. The above-mentioned 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. The embodiment of the present application does not limit the specific connection position of the low-voltage battery 42 .

[0035] The AC port AC is used to receive the AC power supply voltage output by the AC power source 31 and output the first AC voltage to the AC load 32. Exemplarily, the AC power supply voltage or the first AC voltage may be a single-phase AC voltage or a three-phase AC voltage, which is not limited here.

[0036] The high voltage DC port HVDC is used to receive a DC supply voltage output by a power battery 41 in the vehicle and 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 a first output voltage Vout1 to a first DC load 51 and a low-voltage battery 42 in the vehicle.

[0038] The second low voltage DC port LVDC2 is used to output a second output voltage Vout2 to a 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 on-board 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 on-board 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 output 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 can be understood that the above is only a functional description of the AC port AC, the high voltage DC port HVDC, the first low voltage DC port LVDC1, the second low voltage DC port LVDC2 and the onboard power supply device 2, and does not mean that all operations in the functional description will occur simultaneously.

[0042] In the implementation of the embodiment of the present application, the first output voltage Vout1 and the second output voltage Vout2 are in a backup relationship with each other, 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, it is also possible to avoid using two low-voltage batteries in the vehicle power supply device 2. The vehicle power supply device 2 has a simple structural design and a flexible redundant power supply mode, thereby reducing the power consumption of the vehicle power supply device 2 and reducing the volume of the vehicle power supply device 2.

[0043] When the AC port AC is used to connect the AC power source 31, the vehicle-mounted power supply device 2 is also used to receive the AC power supply voltage output by the AC power source 31 through the AC port AC and output the DC charging voltage through the high-voltage DC port HVDC to charge the power battery 41. The above-mentioned vehicle-mounted power supply device 2 is also used to receive the AC power supply voltage output by the AC power source 31 through the AC port AC and output the 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 AC is used to connect the AC load 32, the on-board 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 the first AC voltage through the AC port AC to supply power to the AC load 32. The on-board 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 the 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 the corresponding embodiment, the first DC load 51 includes the main load in the vehicle, and the second DC load 52 includes the functional safety backup load and other secondary loads in the vehicle. Exemplarily, the main load in the vehicle can be a steering system, a braking system, a battery management system, a motor controller, a lamp, and a fan, and the functional safety backup load can be a vehicle driving dynamics control system and a steering system, a braking system, and other secondary loads can be a battery management system. The above is only an example and is not limited here. Optionally, the first DC load 51 includes the functional safety backup load and other secondary loads in the vehicle, and the second DC load 52 includes the main load in 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 also Figure 4 , Figure 4 Schematic diagram of a circuit of a vehicle-mounted power supply device provided in an embodiment of the present application. Figure 4 As shown above Figure 3 The vehicle-mounted power supply device 2 shown includes an integrated conversion circuit 21 and a DC conversion circuit 22. Exemplarily, the DC conversion circuit 22 can be a half-bridge hard switch conversion circuit, a full-bridge conversion circuit or an LLC resonant conversion circuit. Among them, the AC end ac1 of the integrated conversion circuit 21 is connected to the AC port AC, the first DC end dc1 of the integrated conversion circuit 21 is connected to the high-voltage DC port HVDC, and the second DC end dc2 of the integrated conversion circuit 21 is connected to the first low-voltage DC port LVDC1. The first DC end dc3 of the above-mentioned DC conversion circuit 22 is connected to the high-voltage DC port HVDC, and the second DC end dc4 of the DC conversion circuit 22 is connected to the second low-voltage DC port LVDC2.

[0047] When the AC port AC is used to connect the AC power source 31, the integrated conversion circuit 21 is used to receive the AC power supply voltage output by the AC power source 31 through the AC port AC and convert it into a DC charging voltage and output it to the high-voltage DC port HVDC, so that the high-voltage DC port HVDC charges the power battery 41. The above-mentioned integrated conversion circuit 21 is also used to receive the AC power supply voltage output by the AC power source 31 through the AC port AC and convert it into a first output voltage Vout1 and output it 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.

[0048] When the AC port AC is used to connect the AC load 32, the integrated conversion circuit 21 is used to receive the DC supply voltage output by the power battery 41 through the high-voltage DC port HVDC and convert it into a first AC voltage and output it to the AC port AC, so that the AC port AC supplies power to the AC load 32. The above-mentioned integrated conversion circuit 21 is also used to receive the DC supply voltage output by the power battery 41 through the high-voltage DC port HVDC and convert it into a first output voltage Vout1 and output it 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 above-mentioned DC conversion circuit 22 is used to receive the DC supply voltage output by the power battery 41 through the high-voltage DC port HVDC and convert it into a second output voltage Vout2 and output it to the second low-voltage DC port LVDC2, so that 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.

[0050] By implementing the embodiments of the present application, the existing dual power supply system can be replaced by the integrated conversion circuit 21 and the 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 the size of the vehicle power supply device 2.

[0051] In order to reduce the power consumption of the vehicle power supply device 2, the vehicle power supply device 2 can use the integrated conversion circuit 21 and the DC conversion circuit 22 according to the vehicle state. Exemplarily, the vehicle state can be a driving state, a charging state, a discharging state, a non-charging state or a non-discharging state.

[0052] When the vehicle is in a driving state, and the second DC load 52 includes a functional safety standby load and other secondary loads in the vehicle, the DC conversion circuit 22 is used to output 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 conversion circuit 22 is the main power supply circuit, and the integrated conversion circuit 21 is the standby power supply circuit. The standby power supply circuit in the embodiment of the present application is used to provide power supply in the event of a failure in the main power supply circuit.

[0053] When the vehicle is in driving state, and the first DC load 51 includes functional safety standby loads and other secondary loads in the vehicle, the DC conversion circuit 22 has a short circuit or open circuit or other faults that affect power supply and cannot output the second output voltage Vout2 to the second low-voltage DC port LVDC2, and the integrated conversion circuit 21 is used to 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 conversion circuit 21 is the main power supply circuit, and the DC conversion circuit 22 is the standby power supply circuit.

[0054] When the vehicle is in a parking state, and the AC port AC is used to connect the AC power source 31, the integrated conversion circuit 21 is used to output a DC charging voltage to the high-voltage DC port HVDC to charge the power battery 41, and output 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 in a charging state or a parking charging state, and the integrated conversion circuit 21 is the main power supply circuit and the DC conversion circuit 22 is the backup power supply circuit. When the vehicle is in a parking state, and the AC port AC is used to connect the AC load 32, the integrated conversion circuit 21 is used to output a first AC voltage to the AC port AC to supply power to the AC load 32, and output 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 in a discharging state or a parking discharging state, and the integrated conversion circuit 21 is the main power supply circuit and the DC conversion circuit 22 is the backup power supply circuit. When implementing the embodiment of the present application, the integrated conversion circuit 21 is already in a working state when the vehicle is in a charging state or a discharging state. At this time, the already working integrated conversion circuit 21 is used as the main power supply circuit for power supply, which can avoid the situation where the two conversion circuits work at the same time due to starting the DC conversion circuit 22, thereby reducing the power consumption of the on-board power supply device 2, and further reducing the power consumption of the entire vehicle.

[0055] When the vehicle is in a parking state, and the AC port AC is used to connect the AC power source 31, the integrated conversion circuit 21 has a short circuit or open circuit or other faults that affect the power supply, and cannot output the DC charging voltage to the high-voltage DC port HVDC to charge the power battery 41, and cannot 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 above-mentioned DC conversion 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, the vehicle is in a non-charging state or a parking non-charging state, the DC conversion circuit 22 is the main power supply circuit and the integrated conversion circuit 21 is the backup power supply circuit. When the vehicle is in a parking state, and the AC port AC is used to connect the AC load 32, the integrated conversion circuit 21 has a short circuit or open circuit or other faults that affect the power supply, and cannot output the first AC voltage to the AC port AC to supply power to the AC load 32, and cannot 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 above-mentioned DC conversion 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 parking non-discharging state, the DC conversion circuit 22 is the main power supply circuit and the integrated conversion circuit 21 is the backup power supply circuit. It should be understood that the integrated conversion circuit 21 integrates the charging and discharging function and the port power supply function, while the DC conversion circuit 22 only integrates the port power supply function. Therefore, compared with the integrated conversion circuit 21, the DC conversion circuit 22 has lower power consumption when working. In implementing the embodiment of the present application, when the vehicle is in a non-charging state or a non-discharging state, the integrated conversion circuit 21 does not work. At this time, the DC conversion circuit 22 with lower power consumption is used as the main power supply circuit for power supply, which can reduce the power consumption of the on-board power supply device 2, thereby reducing the power consumption of the vehicle as a whole.

[0056] It can be seen that the vehicle power supply device 2 can flexibly switch different conversion circuits according to the actual vehicle status to serve as the main power supply circuit and the backup power supply circuit for power supply. 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 also Figure 5 , Figure 5 is another circuit diagram of the vehicle-mounted power supply device provided in the embodiment of the present application. Figure 5 As shown above Figure 4The vehicle power supply device 2 shown also includes an active power switch (APS) 23, which refers to an active switch connected between the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2, and the active power switch 23 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 the first negative port LVDC1- is connected to the second negative port LVDC2-.

[0058] The above-mentioned active active switch 23 is used to conduct or disconnect the electrical connection between the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2. Exemplarily, when the on-board power supply device 2 is not faulty, or one of the integrated conversion circuit 21 and the DC conversion circuit 22 fails, the active active switch 23 is used to conduct the electrical connection between the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2. When one of the active active switch 23, the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2 fails, the active active switch 23 is used to disconnect the electrical connection between the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2. By implementing the embodiment of the present application, the switching state of the active active switch 23 can be flexibly controlled to meet the different power supply requirements of the on-board power supply device 2. In addition, the existing dual power supply system can be replaced by an integrated conversion circuit 21, a 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, thereby reducing the cost of the vehicle power supply device 2 and reducing the size of the vehicle power supply device 2.

[0059] The active switch 23 may be composed of at least one of a switch and a diode, wherein the number and specific connection method of the switches and diodes may be determined by the actual application scenario and are not limited here. Figure 4In the embodiment, the active switch 23 includes two metal-oxide-semiconductor field-effect transistors (MOSFET). The drains of the two semiconductor field effect transistors are connected, and the two semiconductor field effect transistors are connected in series between the first positive port LVDC1+ and the second positive port LVDC2+. The semiconductor field effect transistor is used to receive instructions to control the electrical connection between the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2, wherein the instructions can be issued by the control circuit of the active switch 23 (such as the control circuit 24 described below). When the integrated conversion circuit 21 outputs the 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 through the two semiconductor field effect transistors to supply power to the second DC load 52. When the DC conversion circuit 22 outputs the second output voltage Vout2 to the second low-voltage DC port LVDC2, and the second low-voltage DC port LVDC2 supplies power to the second DC load 52, the second low-voltage DC port LVDC2 is also used to output the second output voltage Vout2 to the first low-voltage DC port LVDC1 through two semiconductor field effect transistors to supply power to the first DC load 51 and the low-voltage battery 42. In the implementation of the embodiment of the present application, when the two semiconductor field effect transistors are turned on, the first DC load 51, the second DC load 52 and the low-voltage battery 42 can be supplied through any low-voltage DC port of the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2, and the power supply flexibility of the vehicle-mounted power supply device 2 is stronger. In addition, the active switch 23 can also form a current isolation when there is a fault between the first positive port LVDC1+ and the second positive port LVDC2+ to protect the circuit.

[0060] When the vehicle is in any of the driving state, charging state, discharging state, non-charging state and non-discharging state, 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 conducted. When the embodiment of the present application is implemented, when the vehicle is in any of the driving state, charging state, discharging state, non-charging state and non-discharging state, the first DC load 51, the second DC load 52 and the low-voltage battery 42 can be powered through the first low-voltage DC port LVDC1 or the second low-voltage DC port LVDC2, and the power supply efficiency of the vehicle-mounted power supply device 2 is higher.

[0061] When the vehicle is in any state of the driving state, the charging state, the discharging state, the non-charging state and the non-discharging state, and the active switch 23 conducts the electrical connection between the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2, at most one of the integrated conversion circuit 21 and the DC conversion circuit 22 performs voltage conversion. Exemplarily, when the DC conversion circuit 22 fails as the main power supply circuit, the integrated conversion circuit 21 will perform voltage conversion as a backup power supply circuit and output 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, the second DC load 52 and the low-voltage battery 42. When the integrated conversion circuit 21 fails as the main power supply circuit, the DC conversion circuit 22 will perform voltage conversion as a backup power supply circuit and output the 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 implementing the embodiments of the present application, when the main power supply circuit in the integrated conversion circuit 21 and the DC conversion circuit 22 fails, that is, a single-point failure occurs in the vehicle power supply device 2, 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 driving state, charging state, discharging state, non-charging state and non-discharging state, 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 conversion circuit 21 and the DC conversion circuit 22 performs voltage conversion.

[0063] Exemplarily, when the active switch 23 fails, the integrated conversion circuit 21 performs voltage conversion and outputs the first output voltage Vout1 to the first low-voltage DC port LVDC1, and the DC conversion circuit 22 performs voltage conversion and outputs the 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 fault of the active switch 23 can be any one of an overvoltage fault, a short circuit fault, and an undervoltage fault.

[0064] Exemplarily, when the first low-voltage DC port LVDC1 or the second low-voltage DC port LVDC2 fails, the DC conversion circuit 22 serves as the main power supply circuit and has the function of restoring the failure, the integrated conversion circuit 21 performs voltage conversion and outputs the first output voltage Vout1 to the first low-voltage DC port LVDC1, and the DC conversion circuit 22 outputs the second output voltage Vout2 to the second low-voltage DC port LVDC2 after the failure is restored. 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 the first low-voltage DC port LVDC1 or the second low-voltage DC port LVDC2 fails, the DC conversion circuit 22 serves as the main power supply circuit and does not have the function of restoring the failure, the DC conversion circuit 22 stops outputting to quickly isolate the low-voltage DC port that has failed, thereby avoiding the failure of the DC conversion circuit 22, and the integrated conversion 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] Exemplarily, when the first low-voltage DC port LVDC1 or the second low-voltage DC port LVDC2 fails, the integrated conversion circuit 21 serves as the main power supply circuit and has the function of restoring the failure, the integrated conversion circuit 21 outputs the first output voltage Vout1 to the first low-voltage DC port LVDC1 after the failure is restored, and the DC conversion circuit 22 performs voltage conversion and outputs the 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 the first low-voltage DC port LVDC1 or the second low-voltage DC port LVDC2 fails, the integrated conversion circuit 21 serves as the main power supply circuit and does not have the function of restoring the failure, the integrated conversion circuit 21 stops outputting to quickly isolate the low-voltage DC port that has failed, thereby avoiding failure of the integrated conversion circuit 21, and the DC conversion circuit 22 performs voltage conversion and outputs the 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] Wherein, the fault occurring at the first low-voltage DC port LVDC1 or the second low-voltage DC port LVDC2 may be any one of an overvoltage fault, a short circuit fault and an undervoltage fault. Exemplarily, when the main power supply circuit has the function of recovering from an overvoltage fault, the main power supply circuit is used to stop outputting when an overvoltage fault occurs at the low-voltage DC port corresponding to the main power supply circuit, that is, when the voltage of the low-voltage DC port corresponding to the main power supply circuit is greater than or equal to the first preset voltage value, so as to reduce the voltage of the low-voltage DC port corresponding to the main power supply circuit, and when the voltage of the low-voltage DC port corresponding to the main power supply circuit is reduced to the second preset voltage value, the voltage is output to the low-voltage DC port corresponding to the main power supply circuit again, so as to quickly recover from the overvoltage fault of the low-voltage DC port. Wherein, the second preset voltage value is a preset voltage value for recovering the output of the main power supply circuit, and the second preset voltage value is less than the first preset voltage value and greater than the rated voltage of the port corresponding to the main power supply circuit. When the main power supply circuit has the function of recovering from a short-circuit fault, the main power supply circuit is used to adjust the current of the low-voltage DC port corresponding to the main power supply circuit to a second preset current value and continue to output voltage to the low-voltage DC port corresponding to the main power supply circuit when a short-circuit fault occurs at the low-voltage DC port corresponding to the main power supply circuit, that is, when the current of the low-voltage DC port corresponding to the main power supply circuit is greater than or equal to the 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 an undervoltage fault, the main power supply circuit is used to continue to output voltage to the low-voltage DC port corresponding to the main power supply circuit when an undervoltage fault occurs at the low-voltage DC port corresponding to the main power supply circuit, that is, when the voltage of the low-voltage DC port corresponding to the main power supply circuit is less than or equal to the third preset voltage value. The third preset voltage value is less than the rated voltage of the main power supply circuit.

[0067] When implementing the embodiment of the present application, when one of the active switch 23, the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2 fails, that is, a single-point failure occurs in the vehicle power supply device 2, 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 also Figure 6 , Figure 6 is another circuit diagram of the vehicle-mounted power supply device provided in the embodiment of the present application. 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. Exemplarily, the control circuit 24 can be an analog control chip. Among them, the control circuit 24 is connected to the first low-voltage DC port LVDC1 through the first fuse 25. The control circuit 24 is used to receive the first output voltage Vout1 output by the first low-voltage DC port LVDC1 through the first fuse 25, and control the active switch 23 to 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 fuse in the event of a short circuit at the first low-voltage DC port LVDC1, or to fuse in the event of a short circuit at the active switch 23, which can isolate the short-circuit fault of the first low-voltage DC port LVDC1 or the active switch 23, and avoid the short-circuit fault from spreading to the control circuit 24 to cause the control circuit 24 to fail, thereby reducing the failure rate of the control circuit 24.

[0069] When the second low-voltage DC port LVDC2 is short-circuited, the short-circuit fault of the second low-voltage DC port LVDC2 will spread to the first low-voltage DC port LVDC1 through the active switch 23, thereby causing the first low-voltage DC port LVDC1 to be short-circuited. Therefore, the first fuse 25 is also used to fuse when the second low-voltage DC port LVDC2 is short-circuited, which can isolate the short-circuit fault of the second low-voltage DC port LVDC2, and avoid the short-circuit fault from spreading step by step 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 be blown to isolate the fault of the control circuit 24, thereby preventing the fault of the control circuit 24 from spreading to the first low-voltage DC port LVDC1 and the integrated conversion circuit 21 connected thereto, thereby reducing the failure rate of the first low-voltage DC port LVDC1 and the integrated conversion circuit 21. The reason why the control circuit 24 short-circuits may be that the control circuit 24 short-circuits itself, or that the active switch 23 short-circuits and 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 of the integrated conversion circuit 21, wherein the control circuit 26 is connected to the second low-voltage DC port LVDC2 and the low-voltage battery 42 through the second fuse 27. The second fuse 27 is used to fuse when any of the second low-voltage DC port LVDC2, the low-voltage battery 42, and the interface dc5 for the low-voltage battery 42 to power the control circuit 26 is short-circuited. Exemplarily, when any of them is short-circuited, the current of any of them is greater than or equal to the third preset current value. At this time, the second fuse 27 is used to fuse when the current of any of them is greater than or equal to the third preset current value, which can isolate the short-circuit fault to prevent the short-circuit fault 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, wherein the voltage conversion circuit 261 is connected to the second low-voltage DC port LVDC2 and the low-voltage battery 42 through the second fuse 27. When the power or voltage required by the voltage conversion circuit 261 is greater than the preset threshold, the voltage conversion circuit 261 is used to convert the voltage output by the second low-voltage DC port LVDC2 or the low-voltage battery 42 through the second fuse 27, and supply power to the drive circuit (not shown in the figure) corresponding to the control circuit 26. Among them, the preset threshold can be determined by the electronic components inside the vehicle power supply device 2. The above-mentioned drive circuit is used to amplify the power of the switch control signal output by the control circuit 26 and output it to the integrated conversion circuit 21, so that the integrated conversion circuit 21 performs voltage conversion. In addition, the voltage conversion circuit 261 is also used to supply power to the sampling circuit, protection circuit and other circuits corresponding to the control circuit 26. Among them, the sampling circuit is a circuit for collecting electrical parameters of the integrated conversion circuit 21, and the protection circuit is a circuit for providing protection to the integrated conversion circuit 21. When the integrated conversion circuit 21 is short-circuited, the short-circuit fault of the integrated conversion circuit 21 will spread step by step to the voltage conversion circuit 261, thereby causing a short circuit in the voltage conversion circuit 261. At this time, the second fuse 27 is also used to fuse when the voltage conversion circuit 261 is short-circuited to isolate the short-circuit fault of the voltage conversion circuit 261, thereby preventing the short-circuit fault of the voltage conversion circuit 261 from spreading to the second low-voltage DC port LVDC2 and the low-voltage battery 42 to cause them to fail, thereby 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, and 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. Exemplarily, the first chip 263 can be a digital signal processing (DSP) chip. The power management chip 262 is used to convert the voltage output by 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 fails, the fault of the integrated conversion circuit 21 will spread to the corresponding first chip 263, thereby changing the electrical parameters of the power management chip 262. At this time, the power management chip 262 is used to determine that the first chip 263 has failed when the electrical parameters of the power management chip 262 are within the first preset parameter range. Among them, 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 respectively the same as the input voltage and input current of the first chip 263, so it can be determined whether the first chip 263 has failed according to the size of the electrical parameters of the power management chip 262. Exemplarily, when the electrical parameters include the output voltage, the first preset parameter range is greater than or equal to the preset overvoltage voltage value of the power management chip 262, thereby determining that the first chip 263 has an overvoltage fault. When the electrical parameters include the output voltage, the first preset parameter range is less than or equal to the preset undervoltage voltage value of the power management chip 262, thereby determining that the first chip 263 has an undervoltage fault. When the electrical parameter includes 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 a short-circuit fault occurs in the first chip 263 .

[0075] When the power management chip 262 meets a certain automotive safety integrity level (ASIL), such as the requirements of ASIL D, the power management chip 262 has over-voltage and under-voltage protection and short-circuit protection functions. At this time, the power management chip 262 is also used to stop the output when the first chip 263 fails, that is, the power management chip 262 will enter 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 and causing them to fail, thereby 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 further used to convert the voltage output by 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 is used to receive power from the power management chip 262, perform voltage conversion, and supply power to the drive circuit corresponding to the control circuit 26.

[0077] When the integrated conversion circuit 21 fails, the fault of the integrated conversion circuit 21 will spread step by step to the voltage conversion circuit 261, thereby changing the electrical parameters of the voltage conversion circuit 261. At this time, the power management chip 262 is also used to determine that the voltage conversion circuit 261 fails when the electrical parameters of the voltage conversion circuit 261 are within the second preset parameter range. Among them, the electrical parameters of the voltage conversion circuit 261 include output voltage or input current. Exemplarily, when the electrical parameters include output voltage, the second preset parameter range is greater than or equal to the preset overvoltage voltage value of the voltage conversion circuit 261, thereby determining that the voltage conversion circuit 261 has an overvoltage fault. When the electrical parameters include output voltage, the second preset parameter range is less than or equal to the preset undervoltage voltage value of the voltage conversion circuit 261, thereby determining that the voltage conversion circuit 261 has an undervoltage fault. When the electrical parameters include input current, the second preset parameter range is greater than or equal to the preset short-circuit current value of the voltage conversion circuit 261, thereby determining that the voltage conversion circuit 261 has a short-circuit fault.

[0078] When the power management chip 262 has over-voltage and under-voltage protection and short-circuit protection functions, the power management chip 262 is also used to stop the output when a fault occurs in the voltage conversion circuit 261, that is, the power management chip 262 will enter a safe state to isolate the fault of the voltage conversion circuit 261, thereby preventing the fault of 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, thereby 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 combined power supply circuit may be provided between the second fuse 27 or the power management chip 262 and the second low-voltage DC port LVDC2 and the low-voltage battery 42, wherein the combined power supply circuit may be composed of at least one of a diode and a switch. Exemplarily, when the combined power supply circuit is composed of a diode, the circuit structure of the combined power supply circuit may be as follows: Figure 5 As shown, the combined power supply circuit 20 includes a diode D1 and a diode D2. The diode D1 is connected between the low voltage battery 42 and the second fuse 27 and the power management chip 262, and the diode D2 is connected between the second low voltage DC port LVDC2 and the second fuse 27 and the power management chip 262.

[0080] When the low-voltage battery 42 and its line a connected to the diode D1, the interface dc5 (such as KL30) for the low-voltage battery 42 to power the control circuit 26, and the second low-voltage DC port LVDC2 and its line b connected to the diode D2 do not fail, the voltage output by the low-voltage battery 42 and the second low-voltage DC port LVDC2 is the same, that is, the anode voltage of the diode D1 and the anode voltage of the diode D2 are the same. At this time, both the diode D1 and the diode D2 are turned on, and without considering the conduction voltage drop of the diode, the voltage at point e will be raised to a voltage close to the anode voltage of the diode D1 and the diode D2. When any one of the low-voltage battery 42, line a, interface dc5, the second low-voltage DC port LVDC2 and line b fails, such as when the low-voltage battery 42, line a or interface dc5 fails, the anode voltage of the diode D1 will be reduced to less than the voltage at point e or even equal to 0, and the anode voltage of the diode D2 remains unchanged. At this time, the diode D1 is turned off to isolate the faulty low-voltage battery 42, line a or interface dc5, thereby preventing the fault from spreading to the control circuit 26 to cause the control circuit 26 to fail, reducing the failure rate of the control circuit 26. The above-mentioned diode D2 remains in a conductive state to output the second output voltage Vout2 output by the second low-voltage DC port LVDC2 to the control circuit 26, thereby ensuring the normal operation of the control circuit 26 and improving the control reliability of the integrated conversion circuit 21. When the second low-voltage DC port LVDC2 or line b fails, the diode D1 remains in a conductive state to output the voltage output by the low-voltage battery 42 to the control circuit 26, and the diode D1 is turned off to isolate the faulty second low-voltage DC port LVDC2 or line b.

[0081] Among them, any fault of the low-voltage battery 42, line a, interface dc5, second low-voltage DC port LVDC2 and line b may be a short circuit fault, an overvoltage fault, an undervoltage fault or an open circuit fault. Moreover, the cause of any fault may be a fault of the device itself or a fault of other components in the vehicle-mounted power supply device 2 and the fault may spread.

[0082] When implementing the embodiments of the present application, when any one of the low-voltage battery 42, line a, interface DC5, the second low-voltage DC port LVDC2 and line b fails, the control circuit 26 can continue to be powered by the low-voltage battery 42 or the second low-voltage DC port LVDC2 that has not failed through the combined power supply circuit 20 to ensure the normal operation of the control circuit 26, thereby avoiding the situation where the control circuit 26 cannot continue to control the integrated conversion circuit 21 for 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 vehicle-mounted power supply device 2 shown also includes a control circuit 28 and a third fuse 29 of the DC conversion circuit 22, wherein the control circuit 28 is connected to the second low-voltage DC port LVDC2 and the low-voltage battery 42 through the third fuse 29. The third fuse 29 is used to fuse when any of the second low-voltage DC port LVDC2, the low-voltage battery 42, and the interface dc5 through which the low-voltage battery 42 supplies power to the control circuit 28 is short-circuited, and the short-circuit fault can be isolated to prevent the short-circuit fault 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. Exemplarily, 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 one chip, that is, the integrated conversion circuit 21 and the DC conversion circuit 22 are controlled by the same chip. Among them, the voltage conversion circuit 281 is connected to the second low-voltage DC port LVDC2 and the low-voltage battery 42 through the third fuse 29, and the second chip 283 is connected to the second low-voltage DC port LVDC2 and the low-voltage battery 42 through the power management chip 282. It can be understood that the functions of the voltage conversion circuit 281, the power management chip 282 and the second chip 283, the specific implementation methods of isolating the fault of the voltage conversion circuit 281 by the third fuse 29, the fault of the second chip 283 by the power management chip 282 and the specific implementation methods of isolating the fault of the voltage conversion circuit 261 by the power management chip 262 and the corresponding beneficial effects can be found in the above-mentioned functions of the voltage conversion circuit 261, the power management chip 262 and the first chip 263, the specific implementation methods of isolating the fault of the voltage conversion circuit 261 by the second fuse 27, the fault of the first chip 263 by the power management chip 262 and the specific implementation methods of isolating the fault of the voltage conversion circuit 261 by the power management chip 262 and the corresponding beneficial effects, which will not be repeated here.

[0085] like Figure 6As shown, a combined power supply circuit 20 may also be provided between the third fuse 29 or the power management chip 282 and the second low-voltage DC port LVDC2 and the low-voltage battery 42. The diode D1 in the combined power supply circuit 20 is connected between the low-voltage battery 42 and the third fuse 29 and the power management chip 282, and the diode D2 in the combined power supply circuit 20 is connected between the second low-voltage DC port LVDC2 and the third fuse 29 and the power management chip 282. When a fault occurs in the low-voltage battery 42, line a or interface dc5, the diode D1 is cut off to isolate the faulty low-voltage battery 42, line a or interface dc5, thereby preventing the fault from spreading to the control circuit 28 to cause the control circuit 28 to fail, thereby reducing the failure rate of the control circuit 28. The diode D2 remains in a conducting state to output the second output voltage Vout2 output by 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, the diode D1 remains in the on state to output the voltage output by the low-voltage battery 42 to the control circuit 28, and the diode D1 is turned off to isolate the faulty second low-voltage DC port LVDC2 or line b. By implementing the embodiment of the present application, it is possible to avoid the situation where the control circuit 28 cannot continue to control the DC conversion circuit 22 to perform voltage conversion due to a failure of the low-voltage battery 42, thereby improving the control reliability of the DC conversion circuit 22.

[0086] according to Figure 6 The corresponding embodiment shows that the integrated conversion circuit 21 is controlled by the first chip 263 to perform voltage conversion, and the DC conversion circuit 22 is controlled by the second chip 283 to perform voltage conversion. In other words, the integrated conversion circuit 21 and the DC conversion circuit 22 are controlled by independent chips. When one of the first chip 263 and the second chip 283 fails, it will not interfere with the other chip controlling the corresponding conversion circuit, and the control reliability of the vehicle power supply device 2 is higher. In addition, the single point failure of the vehicle power supply device 2 can be isolated to ensure that the cascade failure caused by the single point failure will not be coupled to other components or circuits (such as the combined power supply circuit 20), thereby improving the power supply reliability of the control circuit 26 and the control circuit 28, and further improving the control reliability of the vehicle power supply device 2.

[0087] For example, a circuit topology of the vehicle-mounted power supply device 2 may be as follows: Figure 7 As shown above Figure 6The integrated conversion circuit 21 shown includes a power factor correction circuit 211 and a DC conversion circuit 212. The DC conversion 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 the transformer T1 includes a winding Z1, a winding Z2, and a winding Z3.

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

[0089] When the AC terminal ac1 of the integrated conversion circuit 21 is used to connect the AC power supply 31, the first chip 263 is used to control the power factor correction circuit 211 to convert the AC power supply voltage output by the AC power supply 31 and output the DC voltage to the DC conversion circuit 212. The first chip 263 is also used to control the conduction or disconnection of each switch in the switch Q1 to the switch Q8, so that the DC conversion 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 bus capacitor Cbus is used to reduce or eliminate the fluctuation of the DC voltage output by the power factor correction circuit 211, and the capacitors C1 to C3 are used to reduce or eliminate the fluctuation of the DC charging voltage. The first chip 263 is also used to control the conduction or disconnection of each switch in the switch Q1 to the switch Q4 and the switch Q9 to the switch Q12, so that the DC conversion 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 capacitor C4 and the capacitor C5 are used to reduce or eliminate the fluctuation of the first output voltage Vout1 .

[0090] When the AC terminal ac1 of the integrated conversion circuit 21 is used to connect the AC load 32, the first chip 263 is used to control each switch in the switch Q1 to the switch Q8 to turn on or off, so that the DC conversion circuit 212 performs voltage conversion on the DC power supply voltage output by the power battery 41 and outputs the DC voltage to the power factor correction circuit 211. The above-mentioned capacitors C1 to C3 are used to reduce or eliminate the fluctuation of the DC power supply voltage, and the above-mentioned bus capacitor Cbus is used to reduce or eliminate the fluctuation of the DC voltage output by the DC conversion circuit 212. The first chip 263 is also used to control the power factor correction circuit 211 to invert the DC voltage output by the DC conversion circuit 212 into a first AC voltage to supply power to the AC load 32. The first chip 263 is also used to control each switch in the switch Q5 to the switch Q12 to turn on or off, so that the DC conversion circuit 212 converts the DC power supply voltage output by the power battery 41 into a first output voltage Vout1 and outputs it to the first low-voltage DC port LVDC1. The above-mentioned capacitors C4 and C5 are used to reduce or eliminate the fluctuation of 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 output by the DC conversion 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 can be understood that the power factor correction circuit 211, switches Q1 to Q8, bus capacitors Cbus, capacitors C1 to C3, inductor L1 and transformer T1 constitute the original on-board charger (OBC) conversion circuit of the on-board power supply device 2. The embodiment of the present application adds switches Q9 to Q12, capacitors C4 and C5, and inductor L2 on the basis of the OBC conversion circuit to output the first output voltage Vout1 to the first low-voltage DC port LVDC1, thereby realizing the function of supplying power to the first DC load 51, the second DC load 52 and the low-voltage battery 42. In other words, the DC conversion circuit 212 can reuse the transformer T1 in the OBC conversion circuit and integrate it with the original OBC conversion circuit. There is no need to add an independent DC / DC conversion circuit as the DC conversion circuit 212 on the basis of the OBC conversion circuit. The cost of the on-board power supply device 2 is lower, and the volume of the on-board power supply device 2 is smaller.

[0093] like Figure 7 As shown above Figure 6 The DC conversion circuit 22 shown includes capacitors C6 to C8, switches Q13 to Q16, transformer T2 and inductor L3, and transformer T2 includes winding Z4 and winding Z5. Among them, capacitor C6 and capacitor C7 are connected in series to the first DC terminal dc3 of the DC conversion circuit 22, and switch Q13 and switch Q14 are connected in series to the first DC terminal dc3 of the DC conversion circuit 22. The series connection point of the above capacitors C6 and C7 is connected to one end of the winding Z4, and the series connection point of the switch Q13 and switch Q14 is connected to the other end of the winding Z4. The first end of the winding Z5 is connected to the source of the switch Q16, one end of the capacitor C8, the negative connection end of the second DC terminal dc4 of the DC conversion circuit 22, and the second negative electrode port LVDC2- through the switch Q15. The second end of the winding Z5 is connected to the other end of the capacitor C8, the positive connection end of the second DC terminal dc4, and the second positive electrode port LVDC2+ through the inductor L3. The third end of the winding Z5 is connected to the drain of the switch Q16. The second chip 283 is used to control the on or off of each switch in the switches Q13 to Q16, so that the DC conversion circuit 22 converts the DC supply voltage output by the power battery 41 into a second output voltage Vout2 and outputs it to the second low-voltage DC port LVDC2. The capacitor C6 and the capacitor C7 are used to reduce or eliminate the fluctuation of the DC supply voltage, and the capacitor C6 and the capacitor C7 are used to reduce or eliminate the fluctuation of 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 supply power to the first DC load 51 and the low-voltage battery 42 when the active switch 23 is turned on.

[0094] Understandably, Figure 7The circuit topology of the vehicle-mounted power supply device 2 shown is only an example, and the embodiment of the present application does not limit the circuit topology of the vehicle-mounted power supply device 2.

[0095] By implementing the embodiments of the present application, there is no need to add two independent DC conversion circuits on the basis of the original OBC conversion circuit to respectively power the first low-voltage DC port LVDC1 and the second low-voltage DC port LVDC2, which greatly reduces the cost of the on-board power supply device 2 and reduces the size of the on-board power supply device 2.

[0096] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A vehicle-mounted power supply device, characterized in that: The vehicle-mounted power supply device is used to provide a first output voltage or a second output voltage to a DC load of a vehicle and a low-voltage battery of the vehicle, and the vehicle-mounted power supply device includes: An AC port, used to receive an AC power supply voltage output by an AC power source and output a first AC voltage to an AC load; a high-voltage DC port, used to receive a DC supply voltage output by 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; a first low-voltage DC port, configured to output the first output voltage to a first DC load in the vehicle and the low-voltage battery; a second low-voltage DC port, configured to output the second output voltage to a second DC load in the vehicle; The vehicle-mounted 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 output the second output voltage through the second low-voltage DC port; The first low-voltage DC port is further used to output the first output voltage to the second DC load when the on-board power supply device fails and the second low-voltage DC port cannot output the second output voltage; The second low-voltage DC port is further used to output the second output voltage to the first DC load and the low-voltage battery when the on-board power supply device fails 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, used for receiving the AC power supply voltage output by the AC power source through the AC port and converting it into the DC charging voltage to output to the high-voltage DC port; the integrated conversion circuit is used for receiving the AC power supply voltage output by the AC power source through the AC port and converting it into the first output voltage to output to the first low-voltage DC port; the integrated conversion circuit is used for receiving the DC power supply voltage output by the power battery through the high-voltage DC port and converting it into the first AC voltage to output to the AC port; the integrated conversion circuit is used for receiving the DC power supply voltage output by the power battery through the high-voltage DC port and converting it into the first output voltage to output to the first low-voltage DC port; A DC 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 second output voltage to output to the second low-voltage DC port.

3. The vehicle-mounted power supply device according to claim 2, characterized in that: The vehicle-mounted power supply device is used to change the use of the integrated conversion circuit and the DC conversion circuit according to the vehicle state, wherein: The vehicle is in a driving state, and the DC conversion circuit is used to output the second output voltage to the second low-voltage DC port to supply power to the second DC load; The vehicle is in a driving state, and when the DC conversion circuit fails and cannot output the second output voltage to the second low-voltage DC port, the integrated conversion circuit is used to output the first output voltage to the first low-voltage DC port to supply power to the second DC load; The vehicle is in a parking state, and the integrated conversion circuit is used to output the DC charging voltage to the high-voltage DC port to charge the power battery and 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 output the first output voltage to the first low-voltage DC port to power the first DC load and the low-voltage battery; The vehicle is in a parking state. When the integrated conversion circuit fails 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, or when the integrated conversion circuit fails 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 on-vehicle power supply device also includes an active switch, the first low-voltage DC port includes a first positive port, 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, and 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, the drains of the two semiconductor field effect transistors are connected, the two semiconductor field effect transistors are connected in series between the first positive port and the second positive port, and the semiconductor field effect transistors are used to receive instructions 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 a driving state, a charging state, and a discharging state, the active switch is in an on state, and the electrical connection between the first low-voltage DC port and the second low-voltage DC port is conducted.

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

8. The vehicle-mounted power supply device according to any one of claims 4 to 6, characterized in that: The vehicle-mounted power supply device is used for: When the vehicle is in a driving state, a charging state, and a 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 conversion circuit performs voltage conversion.

9. The vehicle-mounted power supply device according to any one of claims 4 to 8, characterized in that: The on-board power supply device also includes a first fuse, and 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 when a short circuit occurs in the first low-voltage DC port or to blow when a short circuit occurs in the active switch.

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

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

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

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

14. The vehicle-mounted power supply device according to any one of claims 2 to 12, characterized in that: The vehicle-mounted power supply device also includes: A first chip, the first chip is used to control the integrated conversion circuit to perform voltage conversion; The second chip is used to control the DC conversion 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 to 14, wherein the on-board power supply device includes an inverter circuit, which is used to receive the DC supply voltage output by the power battery through the high-voltage DC port and convert it into a three-phase AC voltage to drive the drive motor.

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