Vehicle-mounted DC / DC conversion device and electric vehicle comprising same

Abstract

The vehicle-mounted DC / DC conversion device comprises a high-voltage DC / DC converter, a first end of the high-voltage DC / DC converter is used for being connected with a power battery, and a second end of the high-voltage DC / DC converter is connected with a direct-current bus; the first end of the first low-voltage bidirectional DC / DC converter is connected with the DC bus, and the second end of the first low-voltage bidirectional DC / DC converter is connected with a low-voltage battery or a low The first end of the second low-voltage bidirectional DC / DC converter is connected with the direct-current bus, and the second end of the second low-voltage bidirectional DC / DC converter is connected with an intelligent

Description

Technical Field

[0001] This application relates to the field of power supply, and in particular to on-board DC / DC converters and electric vehicles including such converters. Background Technology

[0002] With social development and technological progress, autonomous driving technology has been applied and promoted in the automotive field.

[0003] Autonomous driving refers to the technology that enables vehicles to autonomously complete driving tasks without continuous human driver operation. It is a complex technological system involving multiple fields such as automotive engineering, artificial intelligence, sensor technology, and communication technology, and it is gradually changing our travel habits and transportation patterns.

[0004] Therefore, in order to achieve safe and reliable intelligent driving, it is crucial to provide a reliable power supply to the intelligent driving control unit.

[0005] In addition, electric vehicles typically include a high-voltage power battery, which serves as the source of electrical energy for the vehicle and also powers the intelligent driving control unit. Electric vehicles often include an onboard DC / DC converter to step down the high-voltage DC power from the power battery and convert it to low-voltage DC power to charge the low-voltage battery within the vehicle, power low-voltage loads (such as windows), or directly power low-voltage loads.

[0006] Therefore, for electric vehicles with intelligent driving capabilities, it is necessary to simultaneously power the intelligent driving control unit and the low-voltage equipment inside the vehicle. How to reliably and safely power both of them, while keeping the converter small in size, has become a key research focus in the industry. Utility Model Content

[0007] According to one embodiment, this application provides an on-board DC / DC converter, comprising: a high-voltage DC / DC converter, with a first end connected to a power battery and a second end connected to a DC bus, for stepping down and converting the high-voltage DC power from the power battery to a first DC voltage on the DC bus; a first low-voltage bidirectional DC / DC converter, with a first end connected to the DC bus and a second end connected to a low-voltage battery or a low-voltage load, for converting the first DC voltage on the DC bus to a second DC power for charging the low-voltage battery or supplying power to the low-voltage load, or converting the second DC power to the first DC voltage on the DC bus; and a second low-voltage bidirectional DC / DC converter, with a first end connected to the DC bus and a second end connected to an intelligent driving controller, for converting the first DC voltage on the DC bus to a third DC power for supplying power to the intelligent driving controller, or converting the third DC power for supplying power to the intelligent driving controller to the first DC voltage on the DC bus.

[0008] Furthermore, the first low-voltage bidirectional DC / DC converter includes a first switching transistor and a first power conversion unit. The first switching transistor is connected between the positive voltage terminal of the DC bus and the first power conversion unit, and the first power conversion unit is used to connect a low-voltage battery or a low-voltage load.

[0009] Furthermore, the second low-voltage bidirectional DC / DC converter includes a second switching transistor and a second power conversion unit. The second switching transistor is connected between the positive voltage terminal of the DC bus and the second power conversion unit, and the second power conversion unit is used to connect to the intelligent driving controller.

[0010] Furthermore, it also includes a controller that controls the high-voltage DC / DC converter, the first low-voltage bidirectional DC / DC converter, and the second low-voltage bidirectional DC / DC converter to operate, such that the high-voltage DC / DC converter steps down the high-voltage DC power from the power battery to a first DC voltage on the DC bus, the first low-voltage bidirectional DC / DC converter converts the first DC voltage on the DC bus to a second DC power for charging the low-voltage battery or supplying power to the low-voltage load, and the second low-voltage bidirectional DC / DC converter converts the first DC voltage on the DC bus to a third DC power for supplying power to the intelligent driving controller.

[0011] Furthermore, it also includes a controller that controls the high-voltage DC / DC converter and the first low-voltage bidirectional DC / DC converter, and controls the second low-voltage bidirectional DC / DC converter to not operate, so that the high-voltage DC / DC converter steps down the high-voltage DC power from the power battery to a first DC voltage on the DC bus, and the first low-voltage bidirectional DC / DC converter converts the first DC voltage on the DC bus into a second DC power for charging the low-voltage battery or supplying power to the low-voltage load.

[0012] Furthermore, the controller controls the second switch to be normally open, so that the second low-voltage bidirectional DC / DC converter is not working.

[0013] Furthermore, it also includes a controller that controls the operation of the high-voltage DC / DC converter and the second low-voltage bidirectional DC / DC converter, while the first low-voltage bidirectional DC / DC converter is not operating. This causes the high-voltage DC / DC converter to step down and convert the high-voltage DC power from the power battery to a first DC voltage on the DC bus, and the second low-voltage bidirectional DC / DC converter to convert the first DC voltage on the DC bus to a third DC power supply for the intelligent driving controller.

[0014] Furthermore, the controller controls the first switch to be normally open, so that the first low-voltage bidirectional DC / DC converter does not operate.

[0015] Furthermore, it also includes a controller that controls the high-voltage DC / DC converter to be inactive, and the first low-voltage bidirectional DC / DC converter and the second low-voltage bidirectional DC / DC converter to be active. This causes the first low-voltage bidirectional DC / DC converter to convert the second DC current into a first DC voltage on the DC bus, and the second low-voltage bidirectional DC / DC converter to convert the first DC voltage on the DC bus into a third DC current to power the intelligent driving controller, or causes the second low-voltage bidirectional DC / DC converter to convert the third DC current into the first DC voltage on the DC bus, and the first low-voltage bidirectional DC / DC converter to convert the first DC voltage on the DC bus into a second DC current to charge the low-voltage battery or power the low-voltage load.

[0016] Furthermore, the first power conversion unit includes: a third switch, with its first end connected to the second end of the first switch and the second end grounded; a first inductor, with its first end connected to the second end of the third switch and the second end connected to the positive voltage terminal of the second DC power supply; the second power conversion unit includes: a fourth switch, with its first end connected to the second end of the second switch and the second end grounded; a second inductor, with its first end connected to the second end of the fourth switch and the second end connected to the positive voltage terminal of the third DC power supply.

[0017] This application also provides an electric vehicle, including: the above-described on-board DC / DC converter.

[0018] The features and technical advantages of this disclosure have been outlined quite extensively above to facilitate a better understanding of the detailed description that follows. Additional features and advantages of this disclosure, which form the subject matter of the claims, will be described below. Those skilled in the art will understand that the disclosed concepts and specific embodiments can be readily used as the basis for modifying or designing other structures or processes to achieve the same purpose as this disclosure. Those skilled in the art will also recognize that such equivalent structures do not depart from the spirit and scope of this disclosure as set forth in the appended claims. Attached Figure Description

[0019] To gain a more complete understanding of this disclosure and its advantages, the following description is provided in conjunction with the accompanying drawings.

[0020] in:

[0021] Figure 1 A schematic diagram of an on-board DC / DC converter according to an embodiment of this application is shown;

[0022] Figure 2A schematic diagram of an on-board DC / DC converter according to another embodiment of this application is shown;

[0023] Figure 3 A schematic diagram of an on-board DC / DC converter according to another embodiment of this application is shown;

[0024] Figure 4 A schematic diagram of an on-board DC / DC converter according to another embodiment of this application is shown;

[0025] Figure 5 A schematic diagram of an on-board DC / DC converter according to another embodiment of this application is shown.

[0026] Unless otherwise stated, corresponding numbers and symbols in the various figures generally refer to corresponding parts. These figures are drawn to clearly illustrate relevant aspects of the various embodiments and are not necessarily drawn to scale. Detailed Implementation

[0027] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] One embodiment of this application provides an on-board DC / DC converter, which can be referred to... Figure 1 The schematic diagram shown is of an embodiment of the vehicle-mounted DC / DC converter of this application. The vehicle-mounted DC / DC converter includes:

[0029] The high-voltage DC / DC converter 200 has a first terminal for connecting to the power battery and a second terminal for connecting to the DC bus Co, and is used to step down the high-voltage DC power from the power battery and convert it into the first DC power V1 on the DC bus Co.

[0030] The first low-voltage bidirectional DC / DC converter 110 has a first end connected to the DC bus Co and a second end used to connect to a low-voltage battery or a low-voltage load. It is used to convert the first DC current V1 on the DC bus Co into a second DC current V2 for charging the low-voltage battery or supplying power to the low-voltage load, or to convert the second DC current V2 into the first DC current V1 on the DC bus Co.

[0031] The second low-voltage bidirectional DC / DC converter 120 has a first end connected to the DC bus Co and a second end connected to the intelligent driving control unit. It is used to convert the first DC current V1 on the DC bus Co into a third DC current V3 to power the intelligent driving control unit, or to convert the third DC current V3 to power the intelligent driving control unit back into the first DC current V1 on the DC bus Co.

[0032] Thus, the vehicle-mounted DC / DC converter of this application can provide separate power to the intelligent driving control unit and other low-voltage equipment in the vehicle, achieving safe and reliable power supply. Furthermore, the high-voltage DC / DC converter 200 in the front stage is shared, resulting in a small converter size.

[0033] Please refer to the following: Figure 1 The first low-voltage bidirectional DC / DC converter 110 includes a first switching transistor Q1 and a first power conversion unit 111. The first switching transistor Q1 is connected between the positive voltage terminal of the DC bus Co and the first power conversion unit 111. The first power conversion unit 111 is used to connect a low-voltage battery or a low-voltage load. Furthermore, as... Figure 1 As shown, the first power conversion unit 111 includes: a third switch Q3, with its first terminal connected to the second terminal of the first switch Q1 and its second terminal grounded; and a first inductor L1, with its first terminal connected to the second terminal of the third switch Q3 and its second terminal connected to the positive voltage terminal of the second DC power supply V2. Thus, the first low-voltage bidirectional DC / DC converter 110 forms a buck converter (step-down) from the DC bus Co to the second DC power supply V2 and a boost converter (step-up) from the second DC power supply V2 to the DC bus Co. Of course, this application does not limit the specific structure of the first low-voltage bidirectional DC / DC converter 110, as long as it can achieve the above-mentioned functions.

[0034] Please refer to the following: Figure 1 The second low-voltage bidirectional DC / DC converter 120 includes a second switching transistor Q2 and a second power conversion unit 121. The second switching transistor Q2 is connected between the positive voltage terminal of the DC bus Co and the second power conversion unit 121. The second power conversion unit 121 is used to connect to the intelligent driving control unit. Furthermore, as... Figure 1 As shown, the second power conversion unit 121 includes: a fourth switch Q4, the first terminal of which is connected to the second terminal of the second switch Q2, and the second terminal is grounded; and a second inductor L2, the first terminal of which is connected to the second terminal of the fourth switch Q4, and the second terminal of which is connected to the positive voltage terminal of the third DC power supply V3. Thus, the second low-voltage bidirectional DC / DC converter 120 forms a buck converter (step-down) from the DC bus Co to the third DC power supply V3, and a boost converter (step-up) from the third DC power supply V3 to the first DC power supply V1. Of course, this application does not limit the specific structure of the second low-voltage bidirectional DC / DC converter 120, as long as it can achieve the above-mentioned functions.

[0035] Please refer to the following: Figure 1 In practical applications, the high-voltage DC / DC converter 200 is an isolated DC / DC converter, which includes a primary-side full-bridge switching unit, a transformer T, and a secondary-side synchronous rectification unit. Specifically, as shown... Figure 1The primary-side full-bridge switching unit shown includes a first switching bridge arm formed by the series connection of the fifth switch Q5 and the sixth switch Q6, and a second switching bridge arm formed by the series connection of the seventh switch Q7 and the eighth switch Q8. The first and second switching bridge arms are connected in parallel, and their parallel ends form the input terminals of the high-voltage DC / DC converter 200 for connecting to the power battery. The transformer T is a center-tapped transformer. The secondary-side synchronous rectification unit includes a ninth switch Q9 connected between the first secondary winding and ground, a tenth switch Q10 connected between the second secondary winding and ground, and an inductor L connected between the common node of the secondary winding and the positive voltage terminal of the DC bus Co, wherein the negative voltage terminal of the DC bus Co is grounded. Thus, the high-voltage DC / DC converter 200 is an isolated step-down DC / DC converter. Of course, this application does not limit the specific structure of the high-voltage DC / DC converter 200, as long as it can realize the step-down of high voltage to low voltage.

[0036] In practical applications, the power battery is typically 400V or 800V, the voltage on the DC bus Co is 24V or 48V, the second DC power supply V2 for charging the low-voltage battery or supplying power to the low-voltage load is 12V, and the third DC power supply V3 for powering the intelligent driving control unit is also 12V. Of course, this application does not limit the specific values ​​of the above voltages.

[0037] For further details, please refer to Figure 2 The diagram shows a vehicle-mounted DC / DC converter according to another embodiment of this application. The vehicle-mounted DC / DC converter also includes a controller 300, which controls the high-voltage DC / DC converter 200, the first low-voltage bidirectional DC / DC converter 110, and the second low-voltage bidirectional DC / DC converter 120 to operate. This ensures that the high-voltage DC / DC converter 200 steps down the high-voltage DC power from the power battery to a first DC power V1 on the DC bus Co; the first low-voltage bidirectional DC / DC converter 110 converts the first DC power V1 on the DC bus Co to a second DC power V2 for charging the low-voltage battery or supplying power to the low-voltage load; and the second low-voltage bidirectional DC / DC converter 120 converts the first DC power V1 on the DC bus Co to a third DC power V3 for supplying power to the intelligent driving control unit. This is applicable when the high-voltage DC / DC converter 200, the first low-voltage bidirectional DC / DC converter 110, and the second low-voltage bidirectional DC / DC converter 120 are all operating normally, and there are no faults, such as short-circuit faults, in the intelligent driving control unit and the low-voltage loads of the vehicle. At this time, the on-board DC / DC converter of this application simultaneously supplies power to both the intelligent driving control unit and the low-voltage load of the vehicle.

[0038] For further details, please refer to Figure 3The diagram shows a vehicle-mounted DC / DC converter according to another embodiment of this application. The vehicle-mounted DC / DC converter also includes a controller 300, which controls the high-voltage DC / DC converter 200 and the first low-voltage bidirectional DC / DC converter 110, and controls the second low-voltage bidirectional DC / DC converter 120 to not operate, so that the high-voltage DC / DC converter 200 steps down the high-voltage DC power from the power battery to the first DC power V1 on the DC bus Co, and the first low-voltage bidirectional DC / DC converter 110 converts the first DC power V1 on the DC bus Co into a second DC power V2 for charging the low-voltage battery or supplying power to the low-voltage load. This applies to modes where the high-voltage DC / DC converter 200, the first low-voltage bidirectional DC / DC converter 110, and the second low-voltage bidirectional DC / DC converter 120 are all functioning normally, but the intelligent driving control unit has a fault, such as a short-circuit fault; or modes where the high-voltage DC / DC converter 200, the first low-voltage bidirectional DC / DC converter 110, and the second low-voltage bidirectional DC / DC converter 120 are all functioning normally, but intelligent driving is not required; or modes where the high-voltage DC / DC converter 200 and the first low-voltage bidirectional DC / DC converter 110 are functioning normally, but the second low-voltage bidirectional DC / DC converter 120 is not functioning normally. In these modes, the on-board DC / DC converter of this application can also supply power to the low-voltage load of the entire vehicle only. When the intelligent driving control unit has a fault, such as a short-circuit fault, the second low-voltage bidirectional DC / DC converter 120 is not working, so it will not affect the supply of power to the low-voltage load of the entire vehicle.

[0039] Furthermore, the controller 300 keeps the second switch Q2 normally open, so that the second low-voltage bidirectional DC / DC converter 120 does not operate. This demonstrates the simplicity of its control mechanism.

[0040] For further details, please refer to Figure 4The diagram shows a vehicle-mounted DC / DC converter according to another embodiment of this application. The vehicle-mounted DC / DC converter also includes a controller 300, which controls the operation of the high-voltage DC / DC converter 200 and the second low-voltage bidirectional DC / DC converter 120, while the first low-voltage bidirectional DC / DC converter 110 is not operating. This allows the high-voltage DC / DC converter 200 to step down the high-voltage DC power from the power battery to a first DC power V1 on the DC bus Co, and the second low-voltage bidirectional DC / DC converter 120 to convert the first DC power V1 on the DC bus Co to a third DC power V3 for powering the intelligent driving control unit. This applies to modes where the high-voltage DC / DC converter 200, the first low-voltage bidirectional DC / DC converter 110, and the second low-voltage bidirectional DC / DC converter 120 all operate normally, but the vehicle does not require low-voltage power supply; or modes where the high-voltage DC / DC converter 200 and the second low-voltage bidirectional DC / DC converter 120 operate normally, but the first low-voltage bidirectional DC / DC converter 110 cannot operate normally. At this time, the on-board DC / DC converter of this application only supplies power to the intelligent driving control unit. When there is a fault at one end of the low-voltage load, such as a short circuit fault, the first low-voltage bidirectional DC / DC converter 110 will not work and will not supply power to the intelligent driving control unit.

[0041] Furthermore, the controller 300 controls the first switching transistor Q1 to remain normally open, so that the first low-voltage bidirectional DC / DC converter 110 does not operate. This demonstrates the simplicity of its control mechanism.

[0042] For further details, please refer to Figure 5 The diagram shows a vehicle-mounted DC / DC converter according to another embodiment of this application. The vehicle-mounted DC / DC converter also includes a controller 300. The controller 300 controls the high-voltage DC / DC converter 200 to be inactive, and the first low-voltage bidirectional DC / DC converter 110 and the second low-voltage bidirectional DC / DC converter 120 to be active. This causes the first low-voltage bidirectional DC / DC converter 110 to convert the second DC current V2 into a first DC current V1 on the DC bus Co, and the second low-voltage bidirectional DC / DC converter 120 to convert the first DC current V1 on the DC bus Co into a third DC current V3 to power the intelligent driving control unit. Alternatively, the second low-voltage bidirectional DC / DC converter 120 can convert the third DC current V3 into the first DC current V1 on the DC bus Co, and the first low-voltage bidirectional DC / DC converter 110 can convert the first DC current V1 on the DC bus Co into a second DC current V2 to charge the low-voltage battery or power the low-voltage load. This applies to a mode where the high-voltage DC / DC converter 200 cannot operate in the vehicle, but the first low-voltage bidirectional DC / DC converter 110 and the second low-voltage bidirectional DC / DC converter 120 can both operate normally. In this mode, the intelligent driving control unit and the low-voltage load can supply power to each other.

[0043] In a specific application scenario, when the high-voltage DC / DC converter 200 fails to work properly due to device or control malfunction, the power battery cannot provide power as a power source. In this case, the low-voltage load can supply power to the intelligent driving control unit through the first low-voltage bidirectional DC / DC converter 110 and the second low-voltage bidirectional DC / DC converter 120 to maintain the operation of the intelligent driving vehicle. The vehicle can then be driven to the nearest repair shop for repairs through intelligent driving, which can greatly improve the user experience.

[0044] from Figure 2 , Figure 3 , Figure 4 and Figure 5 In terms of various operating modes, the on-board DC / DC converter of this application decouples the power battery, low-voltage load, and intelligent driving control unit. When one component fails, the operation of the other two is not affected, thus improving overall vehicle safety. Furthermore, it allows for flexible switching between the aforementioned modes, making control both flexible and simple.

[0045] In existing technologies, vehicle-mounted DC / DC converters supplying power to low-voltage loads are typically single-stage isolated high-voltage DC / DC converters, which directly convert the 400V high-voltage DC power from the power battery into a 12V low-voltage DC power supply for the low-voltage load. However, the high-voltage DC / DC converter 200 of this application converts the 400V high-voltage DC power from the power battery into a first DC power supply on the 24V or 48V DC bus Co. Therefore, the high-voltage DC / DC converter 200 of this application does not require the use of low-conduction-loss switching transistors, and the current flowing through the switching transistors is smaller. This not only improves efficiency but also reduces cost.

[0046] In one embodiment of this application, an electric vehicle is also provided, which includes the aforementioned on-board DC / DC converter. This electric vehicle can achieve intelligent driving, and since the on-board DC / DC converter provides highly reliable power to the intelligent driving controller, the reliability of the electric vehicle's intelligent driving function is also high.

[0047] Although embodiments of the present disclosure and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the spirit and scope of the present disclosure as defined by the appended claims.

[0048] Furthermore, the scope of this application is not intended to be limited to the specific embodiments of the processes, machines, manufactures, compositions of matter, apparatuses, methods, and steps described in the specification. As will be readily understood by those skilled in the art from the disclosure of this publication, processes, machines, manufactures, compositions of matter, means, methods, or steps that perform substantially the same function, currently exist or will be developed or implemented thereafter, will yield substantially the same results as the corresponding embodiments described herein that are available according to this disclosure. Therefore, the appended claims are intended to include such processes, machines, manufactures, compositions of matter, apparatuses, methods, or steps within their scope.

Claims

1. A vehicle-mounted DC / DC converter, characterized in that, include: A high-voltage DC / DC converter, with its first end connected to a power battery and its second end connected to a DC bus, is used to step down and convert the high-voltage DC power from the power battery into a first DC voltage on the DC bus. A first low-voltage bidirectional DC / DC converter has a first end connected to the DC bus and a second end for connecting to a low-voltage battery or a low-voltage load. It is used to convert the first DC voltage on the DC bus into a second DC voltage for charging the low-voltage battery or supplying power to the low-voltage load, or to convert the second DC voltage into the first DC voltage on the DC bus. The second low-voltage bidirectional DC / DC converter has a first end connected to the DC bus and a second end connected to the intelligent driving controller. It is used to convert the first DC voltage on the DC bus into a third DC power supply for the intelligent driving controller, or to convert the third DC power supply for the intelligent driving controller into the first DC voltage on the DC bus.

2. The vehicle-mounted DC / DC converter according to claim 1, characterized in that, The first low-voltage bidirectional DC / DC converter includes a first switching transistor and a first power conversion unit. The first switching transistor is connected between the positive voltage terminal of the DC bus and the first power conversion unit. The first power conversion unit is used to connect a low-voltage battery or a low-voltage load.

3. The vehicle-mounted DC / DC converter according to claim 2, characterized in that, The second low-voltage bidirectional DC / DC converter includes a second switching transistor and a second power conversion unit. The second switching transistor is connected between the positive voltage terminal of the DC bus and the second power conversion unit, which is used to connect to the intelligent driving controller.

4. The vehicle-mounted DC / DC converter according to claim 3, characterized in that, It also includes a controller that controls the high-voltage DC / DC converter, the first low-voltage bidirectional DC / DC converter, and the second low-voltage bidirectional DC / DC converter to operate, such that the high-voltage DC / DC converter steps down the high-voltage DC power from the power battery to a first DC voltage on the DC bus, the first low-voltage bidirectional DC / DC converter converts the first DC voltage on the DC bus to a second DC power for charging the low-voltage battery or supplying power to the low-voltage load, and the second low-voltage bidirectional DC / DC converter converts the first DC voltage on the DC bus to a third DC power for supplying power to the intelligent driving controller.

5. The vehicle-mounted DC / DC converter according to claim 3, characterized in that, It also includes a controller that controls the high-voltage DC / DC converter and the first low-voltage bidirectional DC / DC converter, and controls the second low-voltage bidirectional DC / DC converter to not operate, so that the high-voltage DC / DC converter steps down the high-voltage DC power from the power battery to the first DC voltage on the DC bus, and the first low-voltage bidirectional DC / DC converter converts the first DC voltage on the DC bus into a second DC power for charging the low-voltage battery or supplying power to the low-voltage load.

6. The vehicle-mounted DC / DC converter according to claim 5, characterized in that, The controller keeps the second switch normally open so that the second low-voltage bidirectional DC / DC converter is not working.

7. The vehicle-mounted DC / DC converter according to claim 3, characterized in that, It also includes a controller that controls the high-voltage DC / DC converter and the second low-voltage bidirectional DC / DC converter to operate, while the first low-voltage bidirectional DC / DC converter is not operating, so that the high-voltage DC / DC converter steps down the high-voltage DC power from the power battery to the first DC voltage on the DC bus, and the second low-voltage bidirectional DC / DC converter converts the first DC voltage on the DC bus into a third DC power to supply power to the intelligent driving controller.

8. The vehicle-mounted DC / DC converter according to claim 7, characterized in that, The controller keeps the first switch normally open so that the first low-voltage bidirectional DC / DC converter is not working.

9. The vehicle-mounted DC / DC converter according to claim 3, characterized in that, It also includes a controller that controls the high-voltage DC / DC converter to be inactive, and the first low-voltage bidirectional DC / DC converter and the second low-voltage bidirectional DC / DC converter to be active. The first low-voltage bidirectional DC / DC converter converts the second DC current into the first DC voltage on the DC bus, and the second low-voltage bidirectional DC / DC converter converts the first DC voltage on the DC bus into the third DC current for powering the intelligent driving controller, or the second low-voltage bidirectional DC / DC converter converts the third DC current into the first DC voltage on the DC bus, and the first low-voltage bidirectional DC / DC converter converts the first DC voltage on the DC bus into the second DC current for charging the low-voltage battery or powering the low-voltage load.

10. The vehicle-mounted DC / DC converter according to claim 3, characterized in that, The first power conversion unit includes: The third switch has its first terminal connected to the second terminal of the first switch, and its second terminal grounded. The first inductor has its first end connected to the second end of the third switching transistor, and its second end connected to the positive voltage terminal of the second DC power supply. The second power conversion unit includes: The fourth switching transistor has its first terminal connected to the second terminal of the second switching transistor, and its second terminal is grounded. The second inductor has its first end connected to the second end of the fourth switching transistor, and its second end connected to the positive voltage terminal of the third DC power supply.

11. An electric vehicle, characterized in that, include: The vehicle-mounted DC / DC converter according to any one of claims 1 to 10.

Images