Vehicle-mounted power supply device and vehicle

Abstract

The invention provides a vehicle-mounted power supply device applied to a vehicle, and the vehicle-mounted power supply device comprises a photovoltaic maximum power point tracking (MPPT) controller, a bidirectional DC / DC (Direct Current / Direct Current) conversion circuit and a plurality of ports. The photovoltaic MPPT controller is used for being connected with a vehicle-mounted photovoltaic battery through a port and carrying out MPPT control on the vehicle-mounted photovoltaic battery of the vehicle, and the photovoltaic MPPT controller is further used for receiving power generated by the vehicle-mounted photovoltaic battery and outputting current through the port to supply power to a vehicle load of the vehicle and charge a vehicle-mounted low-voltage storage battery of the vehicle. The bidirectional DC / DC conversion circuit is used for being connected to a vehicle-mounted power battery of a vehicle through a port, and the bidirectional DC / DC conversion circuit receives output current of the photovoltaic MPPT controller and converts voltage to charge the vehicle-mounted power battery.

Description

Technical Field

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

[0002] At present, new energy vehicles have begun to use on-board photovoltaic cells to generate electricity for on-board electrical appliances.

[0003] The existing technology of on-board photovoltaic battery power generation requires the configuration of a large number of new sub-components such as photovoltaic equipment and low-voltage modules, which has a great impact on the circuit architecture of the whole vehicle. At the same time, the on-board photovoltaic battery can only power the low-voltage battery and its directly connected load, and cannot charge the high-voltage power battery. When the low-voltage battery is fully charged, the photovoltaic battery needs to stop working, and the utilization rate of the photovoltaic battery is poor. In addition, since the on-board photovoltaic equipment needs to be placed in a position that can be touched by human hands, such as the roof or hood, there is also a risk of electric shock to the human body. Summary of the invention

[0004] The present application provides a vehicle-mounted power supply device and a vehicle. The vehicle-mounted power supply device maximizes the reuse of existing vehicle components, which can not only improve the power generation utilization rate of the vehicle-mounted photovoltaic cells to increase the vehicle's cruising range, but also avoid the risk of electric shock.

[0005] In the first aspect, the present application provides a vehicle-mounted power supply device, which includes a photovoltaic MPPT controller, a bidirectional DC / DC conversion circuit and multiple ports. The photovoltaic MPPT controller is used to control the power generation of the vehicle-mounted photovoltaic cell according to the MPPT method. One end of the photovoltaic MPPT controller is used to connect to the vehicle-mounted photovoltaic cell through a port of the vehicle-mounted power supply device, and the other end of the photovoltaic MPPT controller is used to connect to multiple ports of the vehicle-mounted power supply device. The photovoltaic MPPT controller is used to receive the power generation of the vehicle-mounted photovoltaic cell and output current through multiple ports to supply power to the vehicle load and charge the vehicle-mounted low-voltage battery respectively. One end of the bidirectional DC / DC conversion circuit is used to connect to the other end of the photovoltaic MPPT controller, and the other end of the bidirectional DC / DC conversion circuit is used to connect to the vehicle-mounted power battery through a port of the vehicle-mounted power supply device. The bidirectional DC / DC conversion circuit is used to receive the output current of the photovoltaic MPPT controller and convert the voltage to charge the vehicle-mounted power battery.

[0006] The on-board power supply device receives the power generated by the on-board photovoltaic cell through the photovoltaic MPPT controller and performs maximum power tracking. The output power can charge the low-voltage battery and supply power to the vehicle load, reducing the power consumption of the on-board power battery for the on-board low-voltage battery and the vehicle load, and reducing the power consumption of the on-board power battery when the bidirectional DC / DC conversion circuit is working, thereby increasing the vehicle's cruising range. At the same time, the bidirectional DC / DC conversion circuit can receive the output current of the photovoltaic MPPT controller and convert the voltage to charge the on-board power battery, further improving the vehicle's cruising range.

[0007] In an implementation form of the first aspect, one end of the bidirectional DC / DC conversion circuit included in the on-board power supply device is used to connect to the on-board low-voltage battery through a port of the on-board power supply device, and the bidirectional DC / DC conversion circuit is used to receive power from the on-board power battery and convert the voltage output to charge the on-board low-voltage battery. Furthermore, the difference between the output voltage of the photovoltaic MPPT controller and the output voltage of the bidirectional DC / DC conversion circuit is greater than 0V and less than or equal to 1V.

[0008] When the output power of the photovoltaic MPPT controller cannot meet the requirements of charging the on-board low-voltage battery and supplying power to the vehicle load, the bidirectional DC / DC conversion circuit can charge the on-board low-voltage battery and supply power to the vehicle load together with the photovoltaic MPPT controller, thereby increasing the redundant power supply of the on-board low-voltage battery and the vehicle load and enhancing the power supply stability. Furthermore, the difference between the output voltage of the photovoltaic MPPT controller and the output voltage of the bidirectional DC / DC conversion circuit is greater than 0V and less than or equal to 1V, thereby preventing the bidirectional DC / DC conversion circuit from transmitting current to the photovoltaic MPPT controller when receiving power from the on-board power battery and converting the voltage output, thereby wasting electric energy.

[0009] In another implementation form of the first aspect, the vehicle power supply device includes a first switch, one end of the first switch is used to connect to one end of the bidirectional DC / DC conversion circuit and the other end of the photovoltaic MPPT controller, the other end of the first switch is used to connect to the vehicle low-voltage battery through a port of the vehicle power supply device, and the first switch is used to prevent the current of the vehicle low-voltage battery from flowing from the other end of the first switch to one end of the first switch.

[0010] The on-board power supply device adds a first switch, which is located between the on-board low-voltage battery and the bidirectional DC / DC conversion circuit and the photovoltaic MPPT controller. When the on-board low-voltage battery outputs current in reverse to the bidirectional DC / DC conversion circuit and the photovoltaic MPPT controller, the first switch blocks the current from passing through to prevent current backflow, thereby protecting the on-board power supply device and saving the electric energy of the on-board low-voltage battery.

[0011] In another implementation form of the first aspect, the first switch of the vehicle power supply device is an Origin switch or an APS switch, and the Origin switch 35 or the APS switch 35 remains turned on after the vehicle 1 stops.

[0012] The first switch of the on-board power supply device adopts an ORI NG tube switch or an APS switch, which can be quickly and accurately controlled to disconnect when needed, thereby enhancing the protection of the on-board power supply device. When the vehicle is parked, the ORI NG tube switch or the APS switch can be controlled to remain turned on to prevent the on-board power supply device from being awakened and working at any time, thereby increasing the stability and safety of power supply.

[0013] In another implementation form of the first aspect, the control chip of the bidirectional DC / DC conversion circuit of the on-board power supply device and the control chip of the photovoltaic MPPT controller are the same.

[0014] The on-board power supply device uses the same control chip to control the operation of the bidirectional DC / DC conversion circuit and the photovoltaic MPPT controller, which improves the information interaction processing speed between the bidirectional DC / DC conversion circuit and the photovoltaic MPPT controller, while saving circuit layout space, making the on-board power supply device more integrated and efficient.

[0015] In another implementation form of the first aspect, the output voltage sampling circuit of the bidirectional DC / DC conversion circuit of the on-board power supply device and the output voltage sampling circuit of the photovoltaic MPPT controller are the same.

[0016] The on-board power supply device uses the same output voltage sampling circuit to control the operation of the bidirectional DC / DC conversion circuit and the photovoltaic MPPT controller, which strengthens the synchronous monitoring of the two output voltages, ensures that the output of the two output voltages meets the control requirements, improves the power supply accuracy of the on-board power supply device, and saves circuit layout space, making the on-board power supply device more integrated and efficient.

[0017] In another implementation form of the first aspect, the vehicle-mounted power supply device includes a monitoring circuit, which detects the magnitude of the vehicle-mounted low-voltage battery voltage and the magnitude of the sum of the vehicle load current through the monitoring circuit and controls the operation of the bidirectional DC / DC conversion circuit.

[0018] The on-board power supply device can monitor the voltage of the on-board low-voltage battery and the sum of the vehicle load current and control the bidirectional DC / DC conversion circuit to work in different modes according to the monitoring results, so that the bidirectional DC / DC conversion circuit works more efficiently and improves the vehicle's cruising range.

[0019] In another implementation form of the first aspect, the voltage of the on-board low-voltage battery is less than a first voltage value, the sum of the vehicle load currents is greater than a first current value, the bidirectional DC / DC conversion circuit outputs a constant voltage to power the on-board low-voltage battery and the vehicle load, the photovoltaic MPPT controller is used to output a constant current to power the on-board low-voltage battery and the vehicle load, and the first voltage value is used to indicate that the SOC value of the low-voltage battery is less than a first threshold value.

[0020] The on-board low-voltage battery voltage is greater than the second voltage value, the sum of the vehicle load currents is less than the second current value and greater than the third current value, the photovoltaic MPPT controller is used to output a constant current to power the vehicle load, the bidirectional DC / DC conversion circuit is in a non-working state, and the second voltage value is used to indicate that the SOC value of the low-voltage battery is greater than the second threshold value.

[0021] The voltage of the on-board low-voltage battery is greater than the second voltage value, and the sum of the vehicle load currents is less than the third current value. The photovoltaic MPPT controller is used to output a constant current to power the vehicle load and the bidirectional DC / DC conversion circuit. The bidirectional DC / DC conversion circuit is used to receive power from the photovoltaic MPPT controller and convert the voltage to charge the on-board power battery.

[0022] The on-board power supply device can adjust the power supply mode according to the needs of the on-board low-voltage battery and the vehicle load. When the on-board low-voltage battery is low or the total power of the vehicle load is large, the bidirectional DC / DC conversion circuit assumes the main power supply function, and the photovoltaic MPPT controller maximizes the use of the on-board photovoltaic battery to generate electricity to supplement the needs of the on-board low-voltage battery and the vehicle load; when the on-board low-voltage battery is fully charged and the total power of the vehicle load is small, the total power of the vehicle load is all provided by the photovoltaic MPPT controller receiving the on-board photovoltaic battery power generation, and the bidirectional DC / DC conversion circuit is in standby mode to avoid continuous power consumption of the on-board power battery; when the on-board low-voltage battery is fully charged and the total power of the vehicle load is smaller, such as when parking outdoors for a long time, the photovoltaic MPPT controller maximizes the use of the on-board photovoltaic battery to generate electricity, and the bidirectional DC / DC conversion circuit boosts and converts the excess power transmitted by the photovoltaic MPPT controller to the on-board power battery side to charge the on-board power battery. Through multiple power supply modes, the on-board power supply device enhances the stability of power supply and improves the vehicle's cruising range.

[0023] In another implementation form of the first aspect, the photovoltaic MPPT controller of the vehicle-mounted power supply device includes a leakage protection circuit, which is used to connect the vehicle-mounted photovoltaic cell and the metal frame of the vehicle when the vehicle-mounted photovoltaic cell leaks.

[0024] Correspondingly, the on-board power supply device can monitor the leakage of the on-board photovoltaic cells and promptly conduct the leakage current to the ground potential point of the vehicle body, such as the metal frame or metal body of the vehicle, for discharge, thereby avoiding the risk of electric shock caused by contact with the on-board photovoltaic cells.

[0025] In another implementation form of the first aspect, the on-board power supply device includes a high-voltage charging circuit, which is used to receive power from a charging pile through a port of the on-board power supply device and convert the voltage to charge the on-board power battery.

[0026] The on-board power supply device integrates a high-voltage charging circuit, realizes integration with the OBC on-board charger, and saves the layout space of the vehicle's electrical devices.

[0027] In another implementation form of the first aspect, the vehicle-mounted power supply device includes a high-voltage control circuit and an inverter circuit, the inverter circuit is used to receive direct current output by the vehicle-mounted power battery through a port of the vehicle-mounted power supply device, and the high-voltage control circuit is used to control the inverter circuit to output alternating current to supply the drive device.

[0028] The on-board power supply device integrates the high-voltage control circuit and the inverter circuit. The on-board power supply device is integrated with the motor controller MCU, realizing the all-in-one integration of the electric drive controller and saving the layout space of the vehicle's electrical devices.

[0029] In a second aspect, the present application provides a powertrain, which includes an on-board drive motor and the on-board power supply device provided in the first aspect, and the on-board power supply device is used to receive power from the on-board power battery and supply power to the on-board drive motor.

[0030] Accordingly, the on-board power supply device is integrated with the on-board drive motor, realizing the integration of the electric drive power assembly and saving the layout space of the vehicle's electric drive power assembly.

[0031] In a third aspect, the present application provides a vehicle, comprising an autonomous driving system and the on-board power supply device provided in the first aspect, wherein the on-board power supply device is used to supply power to the autonomous driving system.

[0032] Correspondingly, the on-board power supply device supplies power to the vehicle's automatic driving system, so that the automatic driving system has a multi-channel redundant power supply system, which enhances the power supply safety of the automatic driving system and improves the safety of use of the automatic driving system.

[0033] In addition, according to the inventive concept of the present application, the on-board power supply device itself can also be integrated with other circuits such as air-conditioning compressor control circuit, battery thermal management system PTC circuit, etc., to further realize the integration of on-board electrical devices. At the same time, the on-board power supply device itself can also be integrated with the drive motor to form an all-in-one electric drive assembly system for electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of a vehicle provided in an embodiment of the present application;

[0035] Figure 2 is a schematic diagram of the connection between the powertrain and the wheels provided in an embodiment of the present application;

[0036] Figure 3 This is a circuit diagram of a vehicle-mounted power supply device provided in an embodiment of the present application;

[0037] Figure 4 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0038] Figure 5This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0039] Figure 6 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0040] Figure 7 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0041] Figure 8 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0042] Fig. 9 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0043] Fig.10 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0044] Fig.11 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0045] Fig.12 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0046] Fig.13 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0047] Fig.14 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0048] Fig.15 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0049] Fig.16 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0050] Fig.17 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application;

[0051] Fig.18 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0052] This section will describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. It should be noted that the embodiments described in this section are only part of the embodiments of the present application, not all of the embodiments. The vehicle load in the present application mainly refers to the low-voltage load for the vehicle, which can be a wire control brake system, a wire control steering system, an air-conditioning system, an assisted driving ADAS system, a lighting system, a wiper system, a window system, etc. The line arrows in the drawings indicate the direction in which the current can flow. The product form of the vehicle-mounted power supply device in the present application can be a specific device with a housing, or it can be a circuit board or a circuit board integrated with a line.

[0053] Figure 1 It is a schematic diagram of a vehicle provided in an embodiment of the present application.

[0054] Figure 1 As shown, the present application provides a vehicle 1, which includes an automatic driving system 6, a braking system 8 and the on-board power supply device 3 provided in the first aspect, and the on-board power supply device 3 is used to supply power to the automatic driving system 6 and the braking system 8 for operation.

[0055] In addition to the on-board power supply device 3, the automatic driving system 6 and the braking system 8, the vehicle 1 also includes an on-board power battery 2, an on-board drive motor 4, an on-board low-voltage battery 5 and an on-board photovoltaic cell 7, wherein the on-board photovoltaic cell 7 is a thin-film photovoltaic cell that can be installed on the surface of the vehicle such as the front hood and the roof. The on-board power supply device 3 is used to receive the power generated by the on-board photovoltaic cell 7 and convert the voltage to transmit to charge the on-board power battery 2 and the on-board low-voltage battery 5 respectively, and to supply power to the vehicle load automatic driving system 6 and the braking system 8, thereby increasing the power supply and improving the cruising range of the vehicle 1. The on-board power supply device 3 is also used to receive power from the on-board power battery 2 and drive the on-board drive motor 4 to rotate, thereby realizing vehicle driving.

[0056] As for the automatic driving system 6 and the braking system 8, they can receive power from the on-board low-voltage battery 5 and the on-board power supply device 3 at the same time on the vehicle, so that the automatic driving system 6 and the braking system 8 have multiple redundant power supplies, thereby improving the safety of use.

[0057] In a specific implementation, the automatic driving system 6 and the braking system 8 are only one type of vehicle loads. Other vehicle loads such as the wire-controlled braking system, wire-controlled steering system, air-conditioning system, lighting system, wiper system, window system, etc. can be connected to the vehicle-mounted power supply device 3, thereby enhancing power supply stability and safety of use.

[0058] Correspondingly, the on-board power supply device 3 supplies power to the vehicle's automatic driving system 6, braking system 8 and other vehicle loads, so that the automatic driving system 6, braking system 8 and other vehicle loads have a multi-channel redundant power supply system, thereby enhancing the power supply safety of the automatic driving system 6, braking system 8 and other vehicle loads, and improving the safety of use of the automatic driving system 6, braking system 8 and other vehicle loads.

[0059] Figure 2 is a schematic diagram of the connection between the powertrain and the wheels provided in an embodiment of the present application, Figure 3 It is a circuit diagram of a vehicle-mounted power supply device provided in an embodiment of the present application.

[0060] Figure 2 As shown, the vehicle-mounted power supply device 3 can be integrated with the vehicle-mounted drive motor 4 to form an electric drive assembly. The power supply device is used to receive power from the vehicle-mounted power battery 2 and drive the vehicle-mounted drive motor 4 to drive the wheels 10 to rotate, thereby realizing vehicle driving.

[0061] Accordingly, the on-board power supply device 3 and the on-board drive motor 4 are integrated into one, thereby realizing the integration of the electric drive power assembly and saving the layout space of the electric drive power assembly of the vehicle 1 .

[0062] Figure 3 As shown, the vehicle-mounted power supply device 3 provided in the embodiment of the present application integrates the inverter circuit 31, the high-voltage charging circuit 34, the bidirectional DC / DC conversion circuit 32 and the photovoltaic MPPT controller 33, and is controlled by the main controller 30, thereby saving circuit layout space.

[0063] The inverter circuit 31 includes three-phase bridge arms L1, L2, L3 and a bus capacitor C. The bridge arm L1 is composed of power switch tubes Q1 and Q2, the bridge arm L2 is composed of power switch tubes Q3 and Q4, and the bridge arm L3 is composed of power switch tubes Q5 and Q6. The inverter circuit 31 receives high-voltage direct current from the vehicle-mounted power battery 2, and the main controller 30 controls each power switch tube to be turned on and off according to the control program, and outputs three-phase electricity U, V, and W from the middle of each bridge arm to drive the vehicle-mounted drive motor 4 to rotate.

[0064] The high-voltage charging circuit 34 is used to receive power from the charging pile H to charge the vehicle-mounted power battery 2 .

[0065] The photovoltaic MPPT controller 33 is used to receive power generated by the vehicle-mounted photovoltaic cell 7 and control the conversion voltage to be output to charge the vehicle-mounted low-voltage battery 5 and to supply power to the bidirectional DC / DC conversion circuit 32 of the automatic driving system 6 and the braking system 8 respectively by the main controller 30 .

[0066] The bidirectional DC / DC conversion circuit 32 can receive power from the photovoltaic MPPT controller 33 and be controlled by the main controller 30 to increase the voltage to charge the vehicle-mounted power battery 2. It can also receive power from the vehicle-mounted power battery 2 and be controlled by the main controller 30 to reduce the voltage to charge the vehicle-mounted low-voltage battery 5 and power the automatic driving system 6 and the braking system 8.

[0067] It should be noted that the automatic driving system 6 and the braking system 8 are only two commonly used vehicle loads. There are many other vehicle loads with different functions on the vehicle, such as a lighting system, a steering system, etc.

[0068] Figure 3 The figure shows an on-board power supply device with an all-in-one integrated structure. In order to meet a wider range of needs, the on-board power supply device provided in this application can also be used alone on the entire vehicle.

[0069] Figure 4 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application.

[0070] Figure 4 A vehicle-mounted power supply device 3 is shown, and the vehicle-mounted power supply device 3 includes a photovoltaic MPPT controller 33, a bidirectional DC / DC conversion circuit 32, and multiple ports a, b, c, d, and e. The photovoltaic MPPT controller 33 is used to control the power generation of the vehicle-mounted photovoltaic cell 7 by using the maximum power point tracking method. One end of the photovoltaic MPPT controller 33 is used to connect to the vehicle-mounted photovoltaic cell 7 through a port b of the vehicle-mounted power supply device 3, and the other end of the photovoltaic MPPT controller 33 is used to connect to multiple ports c and d of the vehicle-mounted power supply device 3. The photovoltaic MPPT controller 33 is used to receive the power generation of the vehicle-mounted photovoltaic cell 7 and output current through multiple ports c and d to supply power to the vehicle load and charge the vehicle-mounted low-voltage battery 5 respectively. One end of the bidirectional DC / DC conversion circuit 32 is used to connect to the other end of the photovoltaic MPPT controller 33, and the other end of the bidirectional DC / DC conversion circuit 32 is used to connect to the vehicle-mounted power battery 2 through a port a of the vehicle-mounted power supply device 3. The bidirectional DC / DC conversion circuit 32 is used to receive the output current of the photovoltaic MPPT controller 33 and convert the voltage to charge the vehicle-mounted power battery 2.

[0071] In one embodiment, the main controller 30 of the vehicle power supply device 3 is used to send control signals to the bidirectional DC / DC conversion circuit 32 and the photovoltaic MPPT controller. The photovoltaic MPPT controller 33 is used to receive the signal of the main controller 30 and control the vehicle photovoltaic cell 7 to generate maximum power by MPPT maximum power tracking. One end of the photovoltaic MPPT controller 33 is connected to the vehicle photovoltaic cell 7, and the other end of the photovoltaic MPPT controller 33 is connected to multiple ports c and d of the vehicle power supply device 3. One end of the bidirectional DC / DC conversion circuit 32 is connected to the other end of the photovoltaic MPPT controller 33, and the other end of the bidirectional DC / DC conversion circuit 33 is connected to the vehicle power battery 2 through a port a of the vehicle power supply device 3. The vehicle power supply device 3 will perform the following power supply work:

[0072] When the power generated by the on-board photovoltaic cell 7 received by the photovoltaic MPPT controller 33 can meet the power requirements of the started vehicle loads and the on-board low-voltage battery 5, the photovoltaic MPPT controller 33 is used to output current through multiple ports c, d, and e according to the signal of the main controller 30 to respectively supply power to the started vehicle loads such as the vehicle automatic driving system 6 and the braking system 8, and to charge the on-board low-voltage battery 5;

[0073] When the power generated by the on-board photovoltaic cell 7 received by the photovoltaic MPPT controller 33 exceeds the power demand of the started vehicle load and the on-board low-voltage battery 5, the bidirectional DC / DC conversion circuit 32 is used to receive the output current of the photovoltaic MPPT controller 33 and convert the voltage according to the signal of the main controller 30 to charge the on-board power battery 2.

[0074] Correspondingly, the on-board power supply device 3 receives the power generation of the on-board photovoltaic cell 7 through the photovoltaic MPPT controller 33 and performs maximum power tracking. The power outputted by the on-board low-voltage battery 5 can be used to charge the on-board low-voltage battery 5 and to supply power to vehicle loads such as the automatic driving system 6 and the braking system 8, thereby reducing the power consumption of the on-board power battery 2 for the on-board low-voltage battery 5 and vehicle loads such as the automatic driving system 6 and the braking system 8, and reducing the power consumption of the on-board power battery 2 when the DCDC bidirectional voltage conversion circuit 32 is working, thereby increasing the cruising range of the vehicle 1. At the same time, the bidirectional DC / DC conversion circuit 32 can receive the output current of the photovoltaic MPPT controller 33 and convert the voltage to charge the on-board power battery 2, thereby further increasing the cruising range of the vehicle 1.

[0075] At the same time, the output voltage of the photovoltaic MPPT controller 33 of the on-board power supply device 3 also needs to be controlled.

[0076] One end of the bidirectional DC / DC conversion circuit 32 included in the vehicle power supply device 3 is used to connect to the vehicle low-voltage battery 5 through a port c of the vehicle power supply device 3. The bidirectional DC / DC conversion circuit 32 is used to receive power from the vehicle power battery 2 and convert the voltage output to charge the vehicle low-voltage battery 5. The difference between the output voltage of the photovoltaic MPPT controller 33 and the output voltage of the bidirectional DC / DC conversion circuit 32 is greater than 0V and less than or equal to 1V.

[0077] In a specific implementation, the output voltage of the photovoltaic MPPT controller 33 will be controlled according to the output voltage of the bidirectional DC / DC conversion circuit 32. When the power generated by the on-board photovoltaic cell 7 received by the photovoltaic MPPT controller 33 cannot meet the power requirements of the started vehicle loads and the on-board low-voltage battery 5, the photovoltaic MPPT controller 33 and the bidirectional DC / DC conversion circuit 32 will output currents through multiple ports c, d, and e according to the signal of the main controller 30 to jointly supply power to the started vehicle loads such as the vehicle automatic driving system 6 and the braking system 8, and charge the on-board low-voltage battery 5. In order to take into account the power supply demand and consider the power output of the photovoltaic MPPT controller 33 as the priority choice for power supply, the difference between the output voltage of the photovoltaic MPPT controller 33 and the output voltage of the bidirectional DC / DC conversion circuit 32 is greater than 0V and less than or equal to 1V, so that the current of the photovoltaic MPPT controller 33 can be smoothly supplied and output.

[0078] Accordingly, when the output power of the photovoltaic MPPT controller 33 cannot meet the charging of the on-board low-voltage battery 5 and the power supply to the vehicle loads such as the automatic driving system 6, the braking system 8, etc., the bidirectional DC / DC conversion circuit 32 can charge the on-board low-voltage battery 5 and power the vehicle loads such as the automatic driving system 6, the braking system 8, etc. together with the photovoltaic MPPT controller 33, thereby increasing the redundant power supply of the on-board low-voltage battery 5 and the vehicle loads such as the automatic driving system 6, the braking system 8, etc., and enhancing the power supply stability. At the same time, the difference between the output voltage of the photovoltaic MPPT controller 33 and the output voltage of the bidirectional DC / DC conversion circuit 32 is greater than 0V and less than or equal to 1V, which not only meets the power supply demand, but also makes the power output of the photovoltaic MPPT controller 33 the priority choice for power supply, thereby preventing the bidirectional DC / DC conversion circuit 32 from transmitting current to the photovoltaic MPPT controller 33 when receiving the power supply of the on-board power battery 2 and reducing the voltage output, thereby wasting power.

[0079] Figure 5 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application.

[0080] Figure 5As shown, the vehicle-mounted power supply device 3 includes a first switch 35, one end of the first switch 35 is used to connect to one end of the bidirectional DC / DC conversion circuit 32 and the other end of the photovoltaic MPPT controller 33, and the other end of the first switch 35 is used to connect to the vehicle-mounted low-voltage battery 5 through a port c of the vehicle-mounted power supply device 3, and the first switch 35 is used to prevent the current from the vehicle-mounted low-voltage battery 5 from flowing. The first switch 35 prevents the current of the vehicle-mounted low-voltage battery 5 from being reversely output to the vehicle-mounted power supply device, protects the vehicle-mounted power supply device 3 and reduces the power loss of the vehicle-mounted low-voltage battery 5.

[0081] In a specific implementation, the first switch 35 can generally be a diode 35. Bidirectional DC / DC conversion circuit photovoltaic MPPT controller When the bidirectional DC / DC conversion circuit 32 and the photovoltaic MPPT controller 33 supply power to the on-board low-voltage battery 5 for charging, the current can pass through the diode 35; when the current of the on-board low-voltage battery 5 flows to the bidirectional DC / DC conversion circuit 32 and the photovoltaic MPPT controller 33, the diode 35 blocks the current from passing. The diode 35 ensures that the on-board low-voltage battery 5 receives unidirectional charging and prevents the current of the on-board low-voltage battery 5 from being reversely output to the on-board power supply device.

[0082] Accordingly, the on-board power supply device 3 is provided with a diode 35. When the current of the on-board low-voltage battery 5 flows to the bidirectional DC / DC conversion circuit 32 and the photovoltaic MPPT controller 33, the diode 35 is used to block the current from flowing through and prevent the current from flowing back. The diode 35 is used to automatically protect the on-board power supply device 3 and reduce the loss of electric energy due to the current flowing back from the on-board low-voltage battery 5.

[0083] Figure 6 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application.

[0084] Figure 6 As shown, the first switch 35 in the vehicle power supply device 3 may be an ORING switch or an APS switch, and the ORING switch 35 or the APS switch 35 remains turned on after the vehicle 1 stops.

[0085] The first switch 35 in the vehicle-mounted power supply device 3 can be designed to adopt an ORING switch or an APS switch, and the ORING switch 35 or the APS switch 35 can receive the control signal of the main controller 30 to switch on and off. When the bidirectional DC / DC conversion circuit 32 and the photovoltaic MPPT controller 33 supply power to the vehicle-mounted low-voltage battery 5 for charging, the ORING switch 35 or the APS switch 35 can receive the control signal of the main controller 30 to conduct so that the current passes; when the current of the vehicle-mounted low-voltage battery 5 flows to the bidirectional DC / DC conversion circuit 32 and the photovoltaic MPPT controller 33, the ORING switch 35 or the APS switch 35 can receive the control signal of the main controller 30 to disconnect and prevent the current from passing. At the same time, when the vehicle 1 is parked, the ORING switch 35 or the APS switch 35 can be controlled to remain on, so as to connect a low-voltage power supply to the vehicle-mounted power supply device 3 to prevent the vehicle-mounted power supply device 3 from being awakened at any time.

[0086] Correspondingly, the first switch 35 of the on-board power supply device 3 adopts an ORI NG tube switch or an APS switch, which can be quickly and accurately controlled to be disconnected when needed, thereby enhancing the protection of the on-board power supply device 3. Moreover, when the vehicle 1 is parked, the ORI NG tube switch 35 or the APS switch 35 can be controlled to remain turned on to prevent the on-board power supply device 3 from being awakened and working at any time, thereby increasing the power supply stability and safety.

[0087] Figure 7 is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application, Figure 8 is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application, Fig. 9 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application.

[0088] Figure 7 , Figure 8 , Fig. 9 As shown, the control chip of the bidirectional DC / DC conversion circuit 32 of the vehicle-mounted power supply device 3 and the control chip of the photovoltaic MPPT controller 33 are the same control chip 321 . Figure 7 The on-board power supply device 3 does not have the first switch 35. Figure 8 The on-board power supply device 3 is provided with a first switch 35. Fig. 9 The on-board power supply device 3 is provided with a first switch 35 and the first switch is controlled by the main controller 30 .

[0089] In a specific implementation, the control circuit boards of the bidirectional DC / DC conversion circuit 32 and the photovoltaic MPPT controller 33 can be set on a circuit board. Both use the same control chip 321 to receive the control signal of the main controller 30. The information interaction processing between the two can be completed inside the chip 321 without having to send and receive through the main controller 30.

[0090] Correspondingly, the vehicle-mounted power supply device 3 uses the same control chip 321 to control the operation of the bidirectional DC / DC conversion circuit 32 and the photovoltaic MPPT controller 33, thereby improving the information interaction processing speed between the bidirectional DC / DC conversion circuit 32 and the photovoltaic MPPT controller 33, while saving circuit layout space, making the vehicle-mounted power supply device 3 more integrated and efficient.

[0091] Fig.10 is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application, Fig.11 is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application, Fig.12 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application.

[0092] Fig.10 , Fig.11 , Fig.12 As shown, the output voltage sampling circuit of the bidirectional DC / DC conversion circuit 32 of the vehicle-mounted power supply device 3 and the output voltage sampling circuit of the photovoltaic MPPT controller 33 are the same output voltage sampling circuit 322 . Fig.10 The vehicle-mounted power supply device 3 is not provided with a control chip 321. Fig.11 The vehicle-mounted power supply device 3 is provided with a control chip 321. Fig.12 The on-board power supply device 3 is provided with a first switch 35 and is controlled by the main controller 30 .

[0093] In a specific implementation, the control circuit board of the bidirectional DC / DC conversion circuit 32 and the photovoltaic MPPT controller 33 can be set on a circuit board. Both use the same output voltage sampling circuit 322 and compare and control the output voltage values ​​of the two to ensure that the output voltages of the two are within a certain range.

[0094] Correspondingly, the vehicle power supply device 3 uses the same output voltage sampling circuit 322 to control the operation of the bidirectional DC / DC conversion circuit 32 and the photovoltaic MPPT controller 33, thereby strengthening the synchronous monitoring of the output voltages of the bidirectional DC / DC conversion circuit 32 and the photovoltaic MPPT controller 33, ensuring that the outputs of the two output voltages meet the control requirements, improving the power supply accuracy of the vehicle power supply device 3, and saving circuit layout space, making the vehicle power supply device 3 more integrated and efficient.

[0095] Fig.13 is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application, Fig.14 is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application, Fig.15 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application.

[0096] Fig.13 , Fig.14 , Fig.15 As shown, the vehicle-mounted power supply device 3 includes a monitoring circuit 36. The vehicle-mounted power supply device 3 detects the voltage of the vehicle-mounted low-voltage battery 5 and the sum of the currents of the vehicle loads such as the automatic driving system 6 and the braking system 8 through the monitoring circuit 36 ​​and controls the operation of the bidirectional DC / DC conversion circuit 32. Fig.13 The vehicle-mounted power supply device 3 is not provided with a control chip 321 and an output voltage sampling circuit 322. Fig.14 The vehicle-mounted power supply device 3 is provided with a control chip 321 and an output voltage sampling circuit 322. Fig.15 An output voltage sampling circuit 322 and a first switch 35 are provided therein.

[0097] In a specific implementation, the monitoring circuit 36 ​​is used to respectively detect the voltage of the on-board low-voltage battery 5 and the sum of the currents of vehicle loads such as the automatic driving system 6, the braking system 8, etc. The on-board power supply device 3 is used to control the bidirectional DC / DC conversion circuit 32 through the main controller 30 to receive the power supply from the on-board power battery 2 and step down the output power to charge the on-board low-voltage battery 5 and to power vehicle loads such as the automatic driving system 6, the braking system 8, etc., or to control the bidirectional DC / DC conversion circuit 32 to receive the power supply from the photovoltaic MPPT controller 33 and step up the voltage to charge the on-board power battery 2.

[0098] Correspondingly, the vehicle power supply device 3 monitors the voltage of the vehicle low-voltage battery 5 and the sum of the currents of vehicle loads such as the automatic driving system 6 and the braking system 8 through the monitoring circuit 36, and controls the bidirectional DC / DC conversion circuit 32 to operate in different modes according to the detection results, so that the bidirectional DC / DC conversion circuit 32 works more efficiently and improves the cruising range of the vehicle 1.

[0099] Fig.16 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application.

[0100] Fig.16 As shown, the photovoltaic MPPT controller 33 of the vehicle-mounted power supply device 3 includes a leakage protection circuit 333, and the leakage protection circuit 333 is used to connect the vehicle-mounted photovoltaic cell 7 and the metal frame 11 of the vehicle when the vehicle-mounted photovoltaic cell 7 leaks electricity.

[0101] Similarly, it can be known that the vehicle-mounted power supply device 3 of the other embodiments mentioned above can also be provided with the same leakage protection circuit 333.

[0102] In a specific embodiment, in order to prevent accidental injury caused by contact between the vehicle-mounted photovoltaic cell 7 and personnel, a leakage protection circuit 333 is provided in the photovoltaic MPPT controller 33 of the vehicle-mounted power supply device 3. The leakage protection circuit 333 integrates a leakage detection function, and when the leakage protection circuit 333 detects that the vehicle-mounted photovoltaic cell 7 is leaking, the vehicle-mounted photovoltaic cell 7 is connected to the metal frame 11 of the vehicle through the port f.

[0103] Correspondingly, the vehicle-mounted power supply device 3 can monitor the leakage of the vehicle-mounted photovoltaic cell 7 and promptly conduct the leakage current to the ground potential point of the vehicle body, such as the metal frame 11 or metal body of the vehicle, for discharge processing, thereby avoiding the risk of electric shock caused by personnel contacting the vehicle-mounted photovoltaic cell 7.

[0104] In some embodiments, in order to save circuit layout space, the high-voltage charging circuit of the OBC or the high-voltage control circuit and inverter circuit of the motor controller MCU may also be integrated into the on-board power supply device 3 .

[0105] Fig.17 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application.

[0106] Fig.17 As shown, the vehicle-mounted power supply device 3 includes a main controller 30 and an inverter circuit 31. The inverter circuit 31 is used to receive direct current output by the vehicle-mounted power battery 2 through a port a of the vehicle-mounted power supply device 3. The main controller 30 is used to control the inverter circuit 31 to output three-phase alternating current U, V, and W to drive the vehicle-mounted drive motor 4.

[0107] Fig.17 As shown, the vehicle power supply device 3 integrates the main controller 30 of the motor controller MCU, the inverter circuit 31, the bidirectional DC / DC conversion circuit 32 and the photovoltaic MPPT controller 33. The inverter circuit 31 receives the high-voltage direct current from the vehicle-mounted power battery 2, and the main controller 30 controls the conduction and disconnection of each power switch tube Q1-Q6 in the inverter circuit 31, and outputs U, V, W three-phase alternating current from each bridge arm L1, L2, L3 to drive the vehicle-mounted drive motor 4 to rotate. The photovoltaic MPPT controller 33 is used to receive the power generated by the vehicle-mounted photovoltaic cell 7 and control the conversion voltage by the main controller 30 to be output to charge the vehicle-mounted low-voltage battery 5 and power the bidirectional DC / DC conversion circuit 32 for the vehicle-mounted automatic driving system 6 and the braking system 8. The bidirectional DC / DC conversion circuit 32 can receive power from the photovoltaic MPPT controller 33 and be controlled by the main controller 30 to increase the voltage to charge the vehicle-mounted power battery 2. It can also receive power from the vehicle-mounted power battery 2 and be controlled by the main controller 30 to reduce the voltage to charge the vehicle-mounted low-voltage battery 5 and power the vehicle-mounted automatic driving system 6 and braking system 8.

[0108] Correspondingly, the vehicle power supply device 3 integrates the main controller 30 and the inverter circuit 31, which is equivalent to integrating the vehicle power supply device 3 with the motor controller MCU, realizing the all-in-one integration of the electric drive controller MCU and saving the layout space of the vehicle electrical devices.

[0109] Fig.18 This is another circuit diagram of the vehicle-mounted power supply device provided in an embodiment of the present application.

[0110] Fig.18 As shown, the on-board power supply device 3 includes a high-voltage charging circuit 34, which is used to receive power from the charging pile H through a port g of the on-board power supply device 3 and convert the voltage to charge the on-board power battery 2.

[0111] The on-board power supply device 3 integrates the high-voltage charging circuit 34 of the OBC on-board charger, the bidirectional DC / DC conversion circuit 32, the photovoltaic MPPT controller 33 and the main controller 30. When the on-board power battery 2 needs to be charged, the main controller 30 controls the high-voltage charging circuit 34 to receive the power supply from the charging pile H through port g, and converts the voltage to charge the on-board power battery 2.

[0112] Correspondingly, the vehicle-mounted power supply device 3 integrates the high-voltage charging circuit 34, realizes integration with the OBC vehicle-mounted charger, and saves the layout space of the vehicle electrical device.

[0113] The vehicle-mounted power supply device 3 in the aforementioned specific embodiment can control the photovoltaic MPPT controller 33 and the bidirectional DC / DC conversion circuit 32 to operate in different working modes according to the power requirements of the vehicle-mounted low-voltage battery 5 and vehicle loads such as the automatic driving system 6, the braking system 8, etc.

[0114] The photovoltaic MPPT controller 33 needs to design a voltage loop and a current loop to track the maximum power point of the vehicle-mounted photovoltaic cell 7 and realize constant voltage / constant current control. The photovoltaic MPPT controller 33 can adopt a dual-loop competition structure, and can also adopt a dual-loop nesting. The bidirectional DC / DC conversion circuit 32 needs to design at least a voltage loop, and can also design a current loop to form a dual-loop competition or dual-loop nesting structure. The specific embodiment of the present application is implemented using dual-loop competition.

[0115] The voltage of the on-board low-voltage battery 5 is less than the first voltage value V1, the sum of the currents of vehicle loads such as the automatic driving system 6 and the braking system 8 is greater than the first current value L1, the bidirectional DC / DC conversion circuit 32 outputs a constant voltage Va to power the on-board low-voltage battery 5 and vehicle loads such as the automatic driving system 6 and the braking system 8, and the photovoltaic MPPT controller 33 is used to output a constant current La to power the on-board low-voltage battery 5 and vehicle loads such as the automatic driving system 6 and the braking system 8, and the first voltage value V1 is used to indicate that the SOC value of the low-voltage battery 5 is less than the first threshold Ya.

[0116] In a specific implementation, the vehicle power supply device will monitor the voltage of the vehicle low-voltage battery 5 and the sum of the currents of the vehicle loads such as the automatic driving system 6 and the braking system 8. When the SOC value of the vehicle low-voltage battery 5 is less than the first threshold value Ya, such as 50%, the voltage value of the vehicle low-voltage battery 5 will be reduced to the first voltage value V1, such as 10V. At the same time, when most of the vehicle loads, such as 2 / 3 of the automatic driving system 6 and the braking system 8, have been started, the sum of their currents is greater than the first current value L1, such as 20A. At this time, it means that the vehicle low-voltage battery 5 and the vehicle loads such as the automatic driving system 6 and the braking system 8 require a larger power supply. Therefore, the bidirectional DC / DC conversion circuit 32 will serve as the main power supply to output a constant voltage Va such as 12V to power the on-board low-voltage battery 5 and vehicle loads such as the automatic driving system 6, the braking system 8, etc., and the photovoltaic MPPT controller 33 will serve as the secondary power supply to output a constant current La such as 10A to power the on-board low-voltage battery 5 and vehicle loads such as the automatic driving system 6, the braking system 8, etc. The two cooperate with each other to meet the power supply requirements of this situation.

[0117] When the voltage of the on-board low-voltage battery 5 is greater than the second voltage value V2, the sum of the currents of the vehicle loads such as the automatic driving system 6 and the braking system 8 is less than the second current value L2 and greater than the third preset current value L3, the photovoltaic MPPT controller 33 is used to output a constant current Lb to power the vehicle loads, the bidirectional DC / DC conversion circuit 32 is in an inoperative state, and the second voltage value L2 is used to indicate that the SOC value of the on-board low-voltage battery 5 is greater than the second threshold value Yb.

[0118] In the specific implementation, the vehicle power supply device will monitor the voltage of the vehicle low-voltage battery 5 and the sum of the current of the vehicle loads such as the automatic driving system 6 and the braking system 8. When the SOC value of the vehicle low-voltage battery 5 is greater than the second threshold value Yb such as 95%, the voltage value of the vehicle low-voltage battery 5 will rise to the second voltage value V2 such as 12V. At the same time, when part of the vehicle loads such as the automatic driving system 6 and the braking system 8 have been started, the sum of their currents is less than the second current value L2 such as 15A, but greater than the third current value L3 such as 10A. At this time, it means that the vehicle low-voltage battery 5 and the vehicle loads such as the automatic driving system 6 and the braking system 8 require little power supply. Therefore, the photovoltaic MPPT controller 33 is used as a power supply to output a constant current Lb such as 13A to power the vehicle low-voltage battery 5 and the vehicle loads such as the automatic driving system 6 and the braking system 8, and the bidirectional DC / DC conversion circuit 32 is in a standby non-working state, but can be awakened at any time to intervene in the work.

[0119] When the voltage of the on-board low-voltage battery 5 is greater than the second voltage value V2, and the sum of the vehicle load currents such as the automatic driving system 6, the braking system 8, etc. is less than the third current value L3, the photovoltaic MPPT controller 33 is used to output a constant current Lc to power the vehicle loads such as the automatic driving system 6, the braking system 8, etc. and the bidirectional DC / DC conversion circuit 32, and the bidirectional DC / DC conversion circuit 32 is used to receive the power supply from the photovoltaic MPPT controller 33 and convert the voltage to charge the on-board power battery 2.

[0120] In a specific implementation, the vehicle power supply device will monitor the voltage of the vehicle low-voltage battery 5 and the sum of the currents of the vehicle loads such as the automatic driving system 6 and the braking system 8. When the SOC value of the vehicle low-voltage battery 5 is greater than the second threshold value Yb such as 95%, the voltage value of the vehicle low-voltage battery 5 will rise to the second voltage value V2 such as 12V. At the same time, when part of the vehicle loads such as the automatic driving system 6 and the braking system 8 have been started, the sum of their currents is less than the third current value L3 such as 10A. At this time, it means that the vehicle low-voltage battery 5 and the vehicle loads such as the automatic driving system 6 and the braking system 8 require less power supply. Therefore, the photovoltaic MPPT controller 33 is used as a power supply to output a constant current Lc such as 12A. Part of the current will be used to charge the vehicle low-voltage battery 5 and the vehicle loads such as the automatic driving system 6 and the braking system 8, and the other part will be used to power the bidirectional DC / DC conversion circuit 32. The bidirectional DC / DC conversion circuit 32 receives this part of the power supply and converts the voltage to charge the vehicle power battery 2.

[0121] Accordingly, the vehicle power supply device 3 can adjust the power supply mode according to the requirements of the vehicle low-voltage battery 5 and vehicle loads such as the automatic driving system 6 and the braking system 8. When the vehicle low-voltage battery 5 is low or the total power of the vehicle loads such as the automatic driving system 6 and the braking system 8 is large, the bidirectional DC / DC conversion circuit 32 assumes the main power supply function, and the photovoltaic MPPT controller 33 maximizes the use of the vehicle photovoltaic battery 7 to generate electricity to supplement the requirements of the vehicle low-voltage battery 5 and vehicle loads such as the automatic driving system 6 and the braking system 8; when the vehicle low-voltage battery 5 is fully charged and the total power requirements of the vehicle loads such as the automatic driving system 6 and the braking system 8 are small, the total power of the vehicle loads such as the automatic driving system 6 and the braking system 8 is all supplied by the photovoltaic MPPT controller 33. The PPT controller 33 receives power generated by the on-board photovoltaic cell 7 to provide, and the bidirectional DC / DC conversion circuit 32 is in standby mode to prevent the on-board power battery 5 from continuously consuming power; when the on-board low-voltage battery 5 is fully charged and the total power demand of the vehicle load such as the automatic driving system 6 and the braking system 8 is smaller, such as when parking outdoors for a long time, the photovoltaic MPPT controller 33 maximizes the use of the on-board photovoltaic cell 7 to generate power, and the bidirectional DC / DC conversion circuit 32 boosts and converts the excess power transmitted by the photovoltaic MPPT controller 33 to the on-board power battery 2 to charge the on-board power battery 2. Through multiple power supply modes, the on-board power supply device 3 enhances the stability of the power supply and improves the cruising range of the vehicle 1.

[0122] In addition, in some implementations, the vehicle-mounted power supply device 3 of the present application can also be integrated with other circuits such as air-conditioning compressor control circuit, battery thermal management system PTC circuit, etc., to further realize the integration of vehicle-mounted electrical devices. At the same time, the vehicle-mounted power supply device 3 itself can also be integrated with the drive motor 4 to form an all-in-one electric drive assembly system for electric vehicles.

Claims

1. A vehicle-mounted power supply device, applied to a vehicle, characterized in that: The vehicle-mounted power supply device includes a photovoltaic maximum power point tracking (MPPT) controller, a bidirectional DC / DC conversion circuit and a plurality of ports, wherein: The photovoltaic MPPT controller is used to connect the vehicle-mounted photovoltaic cell through the port and perform MPPT control on the vehicle-mounted photovoltaic cell; The photovoltaic MPPT controller is also used to receive the power generation of the vehicle-mounted photovoltaic cell and output current through the port to respectively supply power to the vehicle load of the vehicle and charge the vehicle-mounted low-voltage battery; The bidirectional DC / DC conversion circuit is used to be connected to the on-board power battery of the vehicle through the port. The bidirectional DC / DC conversion circuit receives the output current of the photovoltaic MPPT controller and converts the voltage to charge the on-board power battery.

2. The vehicle-mounted power supply device according to claim 1, characterized in that: The bidirectional DC / DC conversion circuit is used to be connected to the on-board low-voltage battery through the port, and the bidirectional DC / DC conversion circuit is used to receive power from the on-board power battery and convert the voltage output to charge the on-board low-voltage battery.

3. The vehicle-mounted power supply device according to claim 2, characterized in that: The vehicle-mounted power supply device includes a first switch, one end of the first switch is used to connect to the bidirectional DC / DC conversion circuit and the photovoltaic MPPT controller, the other end of the first switch is used to connect to the vehicle-mounted low-voltage battery through the port, and the first switch is used to prevent current from the vehicle-mounted low-voltage battery from flowing.

4. The vehicle-mounted power supply device according to claim 3, characterized in that: The first switch is an ORING switch or an APS switch, and the ORING switch or the APS switch is used to remain turned on after the vehicle stops.

5. The vehicle-mounted power supply device according to any one of claims 1 to 4, characterized in that: The vehicle-mounted power supply device also includes a control chip, and the control chip is used to control the bidirectional DC / DC conversion circuit and the photovoltaic MPPT controller.

6. The vehicle-mounted power supply device according to any one of claims 1 to 5, characterized in that: The vehicle-mounted power supply device also includes an output voltage sampling circuit, which is used to sample the output voltage of the bidirectional DC / DC conversion circuit and the output voltage of the photovoltaic MPPT controller.

7. The vehicle-mounted power supply device according to any one of claims 1 to 6, characterized in that: The vehicle-mounted power supply device also includes a monitoring circuit, which is used to monitor the magnitude of the voltage of the vehicle-mounted low-voltage battery and the sum of the vehicle load currents respectively.

8. The vehicle-mounted power supply device according to any one of claims 1 to 7, characterized in that: The bidirectional DC / DC conversion circuit is used to output a constant voltage to supply power to the on-board low-voltage battery and the vehicle load when the voltage of the on-board low-voltage battery is less than a first voltage value and the sum of the vehicle load current is greater than a first current value; The photovoltaic MPPT controller is used to output a constant current to power the on-board low-voltage battery and the vehicle load when the voltage of the on-board low-voltage battery is less than a first voltage value and the sum of the vehicle load current is greater than a first current value, wherein the first voltage value is used to indicate that the SOC value of the on-board low-voltage battery is less than a first threshold value.

9. The vehicle-mounted power supply device according to any one of claims 1 to 8, characterized in that: The photovoltaic MPPT controller is used to output a constant current to power the vehicle load when the voltage of the vehicle-mounted low-voltage battery is greater than a second voltage value and the sum of the vehicle load current is less than a second current value and greater than a third current value, and the second voltage value is used to indicate that the SOC value of the vehicle-mounted low-voltage battery is greater than a second threshold value; or, The photovoltaic MPPT controller is used to output a constant current to power the vehicle load and the bidirectional DC / DC conversion circuit when the voltage of the on-board low-voltage battery is greater than the second voltage value and the sum of the vehicle load current is less than the third current value.

10. The vehicle-mounted power supply device according to any one of claims 1 to 9, characterized in that: The photovoltaic MPPT controller also includes a leakage protection circuit, which is used to connect the on-board photovoltaic cell and the metal frame of the vehicle when the on-board photovoltaic cell leaks electricity.

11. The vehicle-mounted power supply device according to any one of claims 1 to 10, characterized in that: The vehicle-mounted power supply device also includes a high-voltage charging circuit, which is used to receive power from the charging pile through the port and convert the voltage to charge the vehicle-mounted power battery.

12. The vehicle-mounted power supply device according to any one of claims 1 to 11, characterized in that: The vehicle-mounted power supply device also includes a high-voltage control circuit and an inverter circuit. The inverter circuit is used to receive direct current output by the vehicle-mounted power battery through the port, and the high-voltage control circuit is used to control the inverter circuit to convert the direct current into alternating current to supply the vehicle's drive motor.

13. A powertrain, characterized in that: The powertrain includes a drive motor and the on-board power supply device according to any one of claims 1 to 12, wherein the on-board power supply device is used to receive power from the on-board power battery and supply the power to the drive motor of the vehicle.

14. A vehicle, characterized in that: The vehicle comprises a vehicle load and the vehicle-mounted power supply device according to any one of claims 1 to 12, and the vehicle-mounted power supply device is used to supply power to the vehicle load.

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