Three-port DCDC reverse pre-charging circuit and device and vehicle

Abstract

The invention provides a three-port DCDC reverse pre-charging circuit and device and a vehicle, the three-port DCDC reverse pre-charging circuit comprises a first module, a second module and a third module, the first module is used for converting received electric energy; the second module is used for charging the storage battery, so that the storage battery keeps continuous power supply operation on a low-voltage system and power supply operation on a low-voltage power utilization system of the whole vehicle; and the third module is used for realizing a pre-charging function of the high-voltage bus capacitor, and forms a transmission path of low-voltage redundant power supply with the second module. By utilizing the first module, the second module and the third module, the reverse pre-charging function of the high-voltage bus capacitor is realized, and the safety specification that the vehicle is always in power at low voltage is achieved. And meanwhile, the second module and the third module form a transmission path of low-voltage redundant power supply, so that the cost can be greatly reduced.

Description

Technical Field

[0001] This application relates to the technical field of the design and application of new energy vehicles, and particularly relates to a three-port DCDC reverse pre-charge circuit, device and vehicle. Background Art

[0002] In a vehicle power supply system, in order to improve the safety of the power supply system, it is necessary to ensure real-time monitoring of high-voltage components. This requires ensuring that the battery management system remains in a low-voltage always-on state when a low-voltage fault occurs. It is very crucial to implement the DCDC reverse pre-charge function while realizing this function. The existing low-voltage always-on solution is to achieve redundant power supply with the battery through a flyback DCDC converter to support power supply to the load and keep the battery management system in an always-on state to ensure real-time monitoring of the battery pack. However, this low-voltage always-on solution does not have the function of reverse pre-charging the high-voltage bus capacitor. On the other hand, when the vehicle is at high voltage, due to the large potential difference between the power battery and high-voltage components, a very high impact current will be generated at the moment when the high-voltage relay closes. This impact current will damage high-voltage components. In order to suppress the impact current, the existing pre-charge solution is to add a pre-charge device between the power battery and high-voltage components to offset the impact current, but this will inevitably increase the complexity of the system and the cost of the system. Therefore, integrating the reverse pre-charge function on the low-voltage always-on power supply architecture is a direct trend to reduce costs.

[0003] It should be noted that the above introduction of the technical background is only for the convenience of clearly and completely explaining the technical solutions of this application and facilitating the understanding of those skilled in the art. It cannot be considered that the above technical solutions are well-known to those skilled in the art just because these solutions are described in the background art part of this application. Summary of the Invention

[0004] Embodiments of this application provide a three-port DCDC reverse pre-charge circuit, device and vehicle.

[0005] A first aspect embodiment of this application proposes a three-port DCDC reverse pre-charge circuit, including: a first module, a second module and a third module, where:

[0006] The input end of the first module is connected to both the positive and negative poles of the power battery and is used for converting the received electric energy;

[0007] The second module is connected between the first output end of the first module and the positive and negative poles of the battery and is used for charging the battery and supplying power to vehicle low-voltage electrical appliances;

[0008] The input end of the third module is connected to the second output end of the first module, which is used to implement the reverse pre-charging function of the high-voltage bus capacitor and form a path for low-voltage redundant power supply with the second module.

[0009] In a second aspect embodiment of the present application, a three-port DCDC reverse pre-charging device is proposed. The three-port DCDC reverse pre-charging device includes: a relay switch S1, a relay switch S2, and the three-port DCDC reverse pre-charging circuit proposed in the first aspect embodiment of the present application. Among them: the relay switch S1 is connected to the output end of the third module and the high-voltage bus capacitor; the relay switch S2 is connected to the output end of the third module.

[0010] In a third aspect embodiment of the present application, a vehicle is proposed. The vehicle includes the three-port DCDC reverse pre-charging device.

[0011] In a fourth aspect embodiment of the present application, a three-port DCDC reverse pre-charging method is proposed. It is implemented based on the three-port DCDC reverse pre-charging device proposed in the second aspect embodiment of the present application, and includes:

[0012] When the vehicle receives a high-voltage command or a charging command, the three-port DCDC reverse pre-charging circuit controls the energy of the power battery to flow from the first unit to the third module, and realizes the pre-charging operation of the high-voltage bus capacitor by closing the relay switch S1 and opening the relay switch S2;

[0013] After the pre-charging operation is completed, control the main positive relay and the main negative relay to close, the vehicle completes the high-voltage connection, and the three-port DCDC reverse pre-charging circuit controls the energy of the power battery to flow from the first unit to the second module and the third module simultaneously, and provides a power supply environment for the battery and the low-voltage electrical appliances of the whole vehicle by opening the relay switch S1 and closing the relay switch S2, so that the second module and the third module form a path for low-voltage redundant power supply;

[0014] When the vehicle receives a low-voltage command, the three-port DCDC reverse pre-charging circuit stops the third module from working, and continues to control the energy of the power battery to flow from the first unit to the second module by opening both the relay switch S1 and the relay switch S2, maintaining the normal power-on state of the low-voltage electrical system of the whole vehicle and reducing the static power consumption of the battery.

[0015] In a fifth aspect embodiment of the present application, a chip is proposed, including:

[0016] A memory for storing program code;

[0017] A processor, connected to the memory, for reading the program code from the memory to execute the three-port DCDC reverse pre-charging method.

[0018] The technical solutions provided by the embodiments of the present application at least bring the following beneficial effects:

[0019] The DCDC reverse pre-charge circuit, charging device and vehicle of the present application utilize the first module, the second module and the third module to not only realize the reverse pre-charge function of the high-voltage bus capacitor, but also make the vehicle meet the safety specification of low-voltage always-on power. At the same time, the second module and the third module form a transmission path for low-voltage redundant power supply, which can greatly reduce the cost.

[0020] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become obvious and easy to understand from the following description of the embodiments in conjunction with the drawings, where:

[0022] Figure 1 is a schematic structural diagram of a reverse pre-charge circuit provided by the first example of the present application;

[0023] Figure 2 is a schematic structural diagram of a reverse pre-charge circuit provided by the second example of the present application;

[0024] Figure 3 is a schematic structural diagram of a three-port DCDC reverse pre-charge circuit provided by an embodiment of the present application;

[0025] Figure 4 is a schematic structural diagram of a three-port DCDC reverse pre-charge device provided by an embodiment of the present application;

[0026] Figure 5 is a schematic flow diagram of a three-port DCDC reverse pre-charge method provided according to an embodiment of the present application;

[0027] Figure 6 is an architecture block diagram of a chip provided by an embodiment of the present application;

[0028] Figure 7 is a structural block diagram of a chip provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the embodiments of the present application. On the contrary, they are only examples of devices and methods consistent with some aspects of the embodiments of the present application as detailed in the appended claims.

[0030] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the embodiments of the present application. The singular forms "a" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0031] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the embodiments of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "when" as used herein may be interpreted as "when" or "when" or "in response to a determination".

[0032] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application.

[0033] Figure 1 The structural schematic diagram of the reverse pre-charge circuit provided for the first example of the present application. As Figure 1 shown, between the power battery and the high-voltage components (referring to the charger in Figure 1 this context, it should be noted that the high voltage here refers to the voltage level of the high-voltage system. In this embodiment, a high-voltage system of 400V or 800V is adopted), a group of pre-charge resistors and pre-charge relays are connected in parallel. The battery management unit controls the main negative relay and the pre-charge relay to close so that the power battery pre-charges the high-voltage bus capacitor. When the voltage across the high-voltage bus capacitor reaches a certain threshold (this threshold is usually near the voltage value of the power battery, where the specific size of the threshold should be set according to the actual usage scenario and will not be elaborated here one by one), the path of the pre-charge resistor and the pre-charge relay is cut off, and the main positive relay is closed, thereby eliminating the impact current between the power battery and the high-voltage components at the moment when the main positive relay is closed, and enabling the system to safely go on high voltage. However, this reverse pre-charge circuit adds pre-charge resistors and pre-charge relays, which will increase the complexity of the system; on the other hand, the pre-charge relay has a limited service life. After being opened and closed several times, a new pre-charge relay needs to be replaced. If a new energy vehicle adopts the pre-charge circuit described in the first example, it will further increase the maintenance cost.

[0034] Figure 2The figure is a schematic structural diagram of the reverse pre-charge circuit provided by the second example of this application. As Figure 2 shown, a two-port or three-port DCDC module is connected between the main positive relay and the battery. The two-port or three-port DCDC module uses the low-voltage battery discharge to realize the reverse pre-charge of the high-voltage bus capacitor, so as to eliminate the impact current generated at the moment when the main positive relay is closed. The defect of this circuit is that when the vehicle powers off high voltage and the main positive relay and the main negative relay between the power battery and the high-voltage system are disconnected, the two-port or three-port DCDC module can no longer draw power from the power battery. If a battery failure occurs, the battery management unit loses the low-voltage power-on state, and some high-voltage components also lose the monitoring state, posing a safety hazard.

[0035] The three-port DCDC reverse pre-charge circuit, device and vehicle according to the embodiments of the present application will be described below with reference to the accompanying drawings.

[0036] Figure 3 The figure is a schematic structural diagram of a three-port DCDC reverse pre-charge circuit provided by an embodiment of this application. As Figure 3 shown, the three-port DCDC reverse pre-charge circuit 10 includes: a first module 11, a second module 12 and a third module 13, where:

[0037] As Figure 3 shown, the input end of the first module 11 is connected to the positive and negative electrodes of the power battery, and the received electric energy is converted. The first module 11 transmits the electric energy received from the power battery and converts the transmitted electric energy for the reverse pre-charge of the high-voltage bus capacitor, or for supplying power to the load, or for providing the function of maintaining the power-on state to the battery management unit.

[0038] Specifically, as an example, the first module 11 includes a first unit 111 and a conversion unit 112. The input end of the first unit 111 is connected to the positive and negative electrodes of the power battery; the input end of the conversion unit 112 is connected to the output end of the first unit 111 to convert the electric energy.

[0039] More specifically, the first unit 111 includes: a first inductor L1, a first electrolytic capacitor C1, a second electrolytic capacitor C2, a first power device Q1, a second power device Q2, a third power device Q3, and a fourth power device Q4, where: the first end of the first inductor L1 is connected to the positive electrode of the power battery; the first electrolytic capacitor C1 is connected between the first end of the first inductor L1 and the negative electrode of the power battery; the second electrolytic capacitor C2 is connected between the second end of the first inductor L1 and the negative electrode of the power battery; the first end of the first power device Q1 is connected to the second end of the first inductor L1; the first end of the second power device Q2 is connected to the first end of the first power device Q1; the first end of the third power device Q3 is connected to the third end of the first power device Q1, and the third end of the third power device Q3 is connected to the negative electrode of the power battery; the first end of the fourth power device Q4 is connected to the third end of the second power device Q2, and the third end of the fourth power device Q4 is connected to the third end of the third power device Q3. It should be noted that if the three-port DCDC reverse pre-charge circuit 10 is arranged in the vehicle-mounted system, the second ends of the first power device Q1, the second power device Q2, the third power device Q3, and the fourth power device Q4 are all controlled by a pulse-width modulation signal (PWM). The specific control process is relatively traditional and will not be elaborated here one by one. Further, the first power device Q1, the second power device Q2, the third power device Q3, and the fourth power device Q4 can all adopt metal oxide semiconductor (MOS) field effect transistors, or IGBTs (the full English name is Insulated Gate Bipolar Transistor, and the Chinese translation is insulated gate bipolar transistor), or silicon carbide. This application does not limit this. If the first power device Q1, the second power device Q2, the third power device Q3, and the fourth power device Q4 adopt MOS transistors, for example, all adopt NMOS transistors, taking the first power device Q1 as an example, the first end of the first power device Q1 is the drain, the second end is the gate, and the third end is the source.

[0040] It should be noted that the input end of the first unit 111 is directly mounted on both the positive and negative electrodes of the power battery, enabling the three-port DCDC reverse pre-charge circuit 10 to have the function of constantly obtaining power, being unaffected by the disconnection of the main positive relay, and ensuring that the low-voltage system is in an energized state under any circumstances. Therefore, a set of flyback DCDC converter can be saved.

[0041] It should be noted that the first unit 111 can also be set up in the form of a power management chip, an application specific integrated circuit (ASIC for short, whose full English name is Application Specific Integrated Circuit. ASIC is a proprietary application chip designed and manufactured for specific user requirements and specific systems). The specific setting forms will not be elaborated one by one here. As long as the electrical energy of the power battery can be transmitted, any setting form of the first unit 111 is applicable and not limited to this embodiment.

[0042] More specifically, the conversion unit 112 includes: a second inductor L2, a third inductor L3, a fourth inductor L4, a third capacitor C3, and a three-port isolation transformer. Among them: the first end of the second inductor L2 is connected to the output end of the first unit 111 (that is, the first end of the second inductor L2 is connected to the third end of the second power device Q2); the first end of the third inductor L3 is connected to the second end of the second inductor L2; the first end of the third capacitor C3 is connected to the output end of the first unit 111 (that is, the first end of the third capacitor C3 is connected to the first end of the third power device Q3), and the second end of the third capacitor C3 is connected to the second end of the third inductor L3; the primary side of the three-port isolation transformer is connected in parallel with the third inductor L3; the first end of the fourth inductor L4 is connected to the first terminal of the second secondary side of the three-port isolation transformer. The conversion unit 112 converts the electrical energy received by the first unit 111 for power transfer.

[0043] It should be noted that the conversion unit 112 can also be set up in the form of an application specific integrated circuit, etc. The specific setting forms will not be elaborated one by one here. As long as the electrical energy received by the first unit 111 can be converted for power transfer, any setting form of the conversion unit 112 is applicable and not limited to this embodiment.

[0044] As Figure 3 shown, the second module 12 is connected between the first output end of the first module 11 and the positive and negative electrodes of the storage battery (as an example, the second module 12 is connected to the first secondary side of the transformer), and is used to charge the storage battery and supply power to the low-voltage electrical appliances of the whole vehicle, so as to keep the low-voltage power consumption system of the whole vehicle in an always-on power state. The input end of the third module 13 is connected to the second output end of the first module 11 (as an example, the third module 13 is connected to the second secondary side of the transformer), and is used to realize the reverse pre-charging function of the high-voltage bus capacitor and form a path for low-voltage redundant power supply with the second module 12.

[0045] Specifically, as an example, the second module 12 includes: a fifth inductor L5, a fourth capacitor C4, a fifth power device Q5, a sixth power device Q6, a seventh power device Q7, and an eighth power device Q8, where: the first end of the fifth inductor L5 is connected to the positive electrode of the storage battery, and the second end of the fifth inductor L5 is connected to the second terminal of the first secondary side of the three-port isolation transformer; the fourth capacitor C4 is connected in parallel with the storage battery; the first end of the fifth power device Q5 is connected to the first terminal of the first secondary side of the three-port isolation transformer, and the third end of the fifth power device Q5 is connected to the negative electrode of the storage battery; the first end of the sixth power device Q6 is connected to the first end of the fifth power device Q5, and the third end of the sixth power device Q6 is connected to the third end of the fifth power device Q5; the first end of the seventh power device Q7 is connected to the third terminal of the first secondary side of the three-port isolation transformer, and the third end of the seventh power device Q7 is connected to the third end of the sixth power device Q6; the first end of the eighth power device Q8 is connected to the first end of the seventh power device Q7, and the third end of the eighth power device Q8 is connected to the third end of the seventh power device Q7.

[0046] Specifically, as an example, the third module 13 includes: a fifth capacitor C5, a sixth capacitor C6, a sixth inductor L6, a ninth power device Q9, a tenth power device Q10, an eleventh power device Q11, and a twelfth power device Q12, where: the third end of the tenth power device Q10 is connected to the second end of the fourth inductor L4; the first end of the ninth power device Q9 is connected to the first end of the tenth power device Q10, and the third end of the ninth power device Q9 is connected to the second terminal of the second secondary side of the three-port isolation transformer; the first end of the sixth inductor L6 is connected to the first end of the ninth power device Q9; the first end of the eleventh power device Q11 is connected to the third end of the ninth power device Q9; the first end of the twelfth power device Q12 is connected to the third end of the tenth power device Q10, and the third end of the twelfth power device Q12 is connected to the third end of the eleventh power device Q11; the fifth capacitor C5 is connected between the first end of the sixth inductor L6 and the third end of the twelfth power device Q12; the sixth capacitor C6 is connected between the second end of the sixth inductor L6 and the third end of the twelfth power device Q12.

[0047] Further, the fifth power device Q5, the sixth power device Q6, the seventh power device Q7, the eighth power device Q8, the ninth power device Q9, the tenth power device Q10, the eleventh power device Q11, and the twelfth power device Q12 can all be metal oxide semiconductor (MOS) field effect transistors, or IGBTs, or silicon carbide. This application does not limit this. If the fifth power device Q5, the sixth power device Q6, the seventh power device Q7, the eighth power device Q8, the ninth power device Q9, the tenth power device Q10, the eleventh power device Q11, and the twelfth power device Q12 use MOS transistors, for example, all use NMOS transistors, taking the fifth power device Q5 as an example, the first end of the fifth power device Q5 is the drain, the second end is the gate, and the third end is the source.

[0048] It should be noted that when reverse pre-charging the high-voltage bus capacitor, the first unit 111, the second module 12, and the third module 13 all participate in the operation. A part of the electric energy of the power battery flows from the first unit 111 to the third module 13, as Figure 4 shown, the relay switch S1 is closed and the relay switch S2 is opened for pre-charging the high-voltage bus capacitor; another part of the electric energy of the power battery flows from the first unit 111 to the second module 12 to supply power to the battery and the low-voltage electrical appliances of the whole vehicle (it should be noted that the low voltage here refers to the voltage level of the low-voltage system, and common low voltages are 12V, 24V, etc.). It should be particularly noted here that when the main positive relay is disconnected during high-voltage power-off, it does not affect the three-port DCDC from taking power and transferring energy to the second module and the third module, which ensures the reliable power supply of the low-voltage system.

[0049] When the pre-charging voltage reaches the required threshold value, the main positive relay is controlled to close, thereby eliminating the impact current generated due to the potential difference at the moment of relay closing, and enabling the high-voltage system of the whole vehicle to safely go on high voltage. Among them, the high-voltage bus capacitor, the main positive relay, and the main negative relay are shown in Figure 4 it.

[0050] After the whole vehicle goes off high voltage and the main positive relay and the main negative relay are disconnected, due to the unique connection method of this application, the first unit 111 directly takes power from both ends of the power battery without passing through any high-voltage relays in the middle. This enables the three-port DCDC pre-charging circuit 10 to still control the energy of the power battery to flow from the first unit 111 to the second module 12 and the third module 13 even when the low-voltage battery is dead or in a faulty state, keeping the low-voltage system of the whole vehicle in a constantly powered state.

[0051] It should be further noted that the second module 12 and the third module 13 can also be arranged in the form of a full-bridge circuit, a half-bridge circuit, a rectifier circuit, a Buck circuit, etc. As long as they can charge the battery and supply power to the low-voltage electrical appliances of the whole vehicle, realize the reverse pre-charging function of the high-voltage bus capacitor, and form the function of the path for low-voltage redundant power supply, any setting form of the second module 12 and the third module 13 is applicable and is not limited to this embodiment.

[0052] Figure 4 FIG. is a schematic structural diagram of a three-port DCDC reverse pre-charging device provided by an embodiment of the present application. As Figure 4 shown, the three-port DCDC reverse pre-charging device includes the three-port DCDC reverse pre-charging circuit, the relay switch S1 and the relay switch S2 provided in the above embodiment, wherein: the relay switch S1 is connected to the output end of the third module and the high-voltage bus capacitor; the relay switch S2 is connected to the output end of the third module.

[0053] After the system receives the pre-charging instruction, by controlling the relay switch S1 to close and the relay switch S2 to open, the first unit, the second module and the third module of the three-port DCDC reverse pre-charging circuit work. At this time, the power flows from the power battery to the third module, and the third module pre-charges the high-voltage bus capacitor through the port LV1. When the pre-charging voltage at both ends of the high-voltage bus capacitor approaches the power voltage, the relay switch S1 and the relay switch S2 are closed to suppress the inrush current and enable the system to safely go on high voltage.

[0054] After the system completes the operation of going on high voltage, the relay switch S1 is controlled to open and the relay switch S2 is closed. At this time, the first unit, the second module and the third module all work, and the electric energy flows from the first unit to the second module and the third module at the same time. Among them, in the path of the first unit and the second module, the flowing electric energy charges the battery to keep the battery continuously supplying power to the low-voltage system; in the path of the first unit and the third module, a standby power supply is provided through the port LV2 to realize redundant power supply with the second module and reduce the energy consumption of the low-voltage battery.

[0055] After the system goes off high voltage, the main positive relay and the main negative relay are disconnected to cut off the high-voltage circuit. At this time, the energy of the power battery is controlled to flow through the first unit to the second module and the third module. On the one hand, it supplies power to the low-voltage electrical appliances, and on the other hand, it charges the battery. It should be particularly noted that when the low-voltage battery fails or runs out of power, the three-port DCDC reverse pre-charging circuit can still maintain the output of low-voltage energy to ensure the real-time monitoring function of high-voltage components such as the battery pack. It should be added that the battery pack is not shown in Figure 4 is shown.

[0056] The present application also provides a vehicle, which includes the three-port DCDC reverse pre-charging device provided in the above embodiments. Since the vehicle does not need to additionally set a flyback converter and at the same time has the function of reverse pre-charging, the complexity of the vehicle is greatly reduced, the cost is reduced, and the safety is ensured, and it has wide applicability.

[0057] Figure 5 It is a schematic flow chart of a DCDC reverse pre-charging method provided according to an embodiment of the present application. As Figure 5 shown, this method is implemented based on the three-port DCDC reverse pre-charging device provided in the embodiments of the present application, and includes but is not limited to the following steps:

[0058] S101, when the vehicle receives a high-voltage command or a charging command, the three-port DCDC reverse pre-charging circuit controls the energy of the power battery to flow from the first unit to the third module, and pre-charges the high-voltage bus capacitor by closing the relay switch S1 and opening the relay switch S2.

[0059] S102, after the pre-charging operation is completed, control the main positive relay and the main negative relay to close, the vehicle completes the high-voltage connection, and the three-port DCDC reverse pre-charging circuit controls the energy of the power battery to flow from the first unit to the second module and the third module simultaneously, and provides a power consumption environment for the battery and the vehicle low-voltage electrical appliances by opening the relay switch S1 and closing the relay switch S2, so that the second module and the third module form a path for low-voltage redundant power supply.

[0060] S103, when the vehicle receives a low-voltage command, the three-port DCDC reverse pre-charging circuit stops the third module from working, and continues to control the energy of the power battery to flow from the first unit to the second module by opening both the relay switch S1 and the relay switch S2, maintaining the always-on state of the vehicle low-voltage power consumption system and reducing the static power consumption of the battery.

[0061] Figure 6 It is a block diagram of the architecture of the chip provided in the embodiments of the present application. Figure 6 The shown chip is only an example and should not bring any limitation to the functions and application scope of the embodiments of the present application.

[0062] As Figure 6As shown, the architecture of chip 600 includes a processor 601, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 602 or a program loaded from a memory 606 into a random access memory (RAM) 603. In the RAM 603, various programs and data required for the operation of the chip 600 are also stored. The processor 601, the ROM 602, and the RAM 603 are connected to each other via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0063] The following components are connected to the I / O interface 605: a memory 606 including a hard disk, etc.; and a communication section 607 including a network interface card such as a LAN (local area network) card, a modem, etc., and the communication section 607 performs communication processing via a network such as the Internet; a drive 608 is also connected to the I / O interface 605 as needed.

[0064] In particular, according to an embodiment of the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program carried on a computer-readable medium, and the computer program includes program code for performing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through the communication section 607. When the computer program is executed by the processor 601, the above functions defined in the method of the present application are executed.

[0065] In an exemplary embodiment, a non-transitory computer-readable storage medium is also provided, such as a memory including instructions, and the above instructions can be executed by the processor 601 of the chip 600 to complete the above method. Optionally, the storage medium can be a non-transitory computer-readable storage medium. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0066] In the present application, a computer-readable storage medium may be any tangible medium that contains or stores a program, which can be used by or in conjunction with an instruction execution system, apparatus, or device. In the present application, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries computer-readable program code. Such a propagated data signal may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the foregoing. The computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical fiber, RF, etc., or any suitable combination of the foregoing

[0067] Figure 7 The block diagram of the structure of the chip provided by the embodiment of the present application Figure 7 The chip shown is merely an example and should not impose any limitation on the functions and scope of use of the embodiments of the present application. As Figure 7 shown, the chip 700 includes a processor 701 and a memory 702. Among them, the memory 702 is used to store program code, and the processor 701 is connected to the memory 702 and is used to read the program code from the memory 702 to implement the DCDC reverse precharge method in the above embodiments

[0068] Optionally, the number of processors 701 may be one or more

[0069] Optionally, the chip may further include an interface 703, and the number of the interfaces 703 may be multiple. The interface 703 may be connected to an application program and may receive data of external devices such as sensors, etc

[0070] Those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present invention, which follow the general principles of the present invention and include known common knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the following claims

[0071] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims

Claims

1. A three-port DCDC reverse pre-charge circuit, characterized in that Comprising: A first module, a second module and a third module, wherein: The input end of the first module is connected to the positive and negative poles of the power battery, and is used for converting the received electric energy; The second module is connected between the first output end of the first module and the positive and negative poles of the storage battery, and is used for charging the storage battery and supplying power to the low-voltage electrical appliances of the whole vehicle; The input end of the third module is connected to the second output end of the first module, and is used to realize the reverse pre-charging function of the high-voltage bus capacitor, and form a path for low-voltage redundant power supply with the second module.

2. The three-port DCDC reverse pre-charge circuit according to claim 1, wherein The first module includes a first unit and a conversion unit. Among them, the input end of the first unit is connected to the positive and negative poles of the power battery to transmit electric energy; the input end of the conversion unit is connected to the output end of the first unit to convert electric energy.

3. The three-port DCDC reverse pre-charge circuit according to claim 2, characterized in that, The first unit includes: a first inductor, a first electrolytic capacitor, a second electrolytic capacitor, a first power device, a second power device, a third power device and a fourth power device, wherein: the first end of the first inductor is connected to the positive pole of the power battery; the first electrolytic capacitor is connected between the first end of the first inductor and the negative pole of the power battery; the second electrolytic capacitor is connected between the second end of the first inductor and the negative pole of the power battery; the first end of the first power device is connected to the second end of the first inductor; the first end of the second power device is connected to the first end of the first power device; the first end of the third power device is connected to the third end of the first power device, and the third end of the third power device is connected to the negative pole of the power battery; the first end of the fourth power device is connected to the third end of the second power device, and the third end of the fourth power device is connected to the third end of the third power device.

4. The three-port DCDC reverse pre-charge circuit according to claim 2, wherein The conversion unit includes: a second inductor, a third inductor, a fourth inductor, a third capacitor and a three-port isolation transformer, wherein: the first end of the second inductor is connected to the output end of the first unit; the first end of the third inductor is connected to the second end of the second inductor; the first end of the third capacitor is connected to the output end of the first unit, and the second end of the third capacitor is connected to the second end of the third inductor; the primary side of the three-port isolation transformer is connected in parallel with the third inductor; the first end of the fourth inductor is connected to the first terminal of the second secondary side of the three-port isolation transformer.

5. The three-port DCDC reverse pre-charge circuit according to claim 4, characterized in that, The second module includes: a fifth inductor, a fourth capacitor, a fifth power device, a sixth power device, a seventh power device, and an eighth power device, where: the first end of the fifth inductor is connected to the positive electrode of the storage battery, and the second end of the fifth inductor is connected to the second terminal of the first secondary side of the three-port isolation transformer; the fourth capacitor is connected in parallel with the storage battery; the first end of the fifth power device is connected to the first terminal of the first secondary side of the three-port isolation transformer, and the third end of the fifth power device is connected to the negative electrode of the storage battery; the first end of the sixth power device is connected to the first end of the fifth power device, and the third end of the sixth power device is connected to the third end of the fifth power device; the first port of the seventh power device is connected to the third terminal of the first secondary side of the three-port isolation transformer, and the third end of the seventh power device is connected to the third end of the sixth power device; the first end of the eighth power device is connected to the first end of the seventh power device, and the third end of the eighth power device is connected to the third end of the seventh power device.

6. The three-port DCDC reverse pre-charge circuit according to claim 4, wherein, The third module includes: a fifth capacitor, a sixth capacitor, a sixth inductor, a ninth power device, a tenth power device, an eleventh power device, and a twelfth power device, where: the third end of the tenth power device is connected to the second end of the fourth inductor; the first end of the ninth power device is connected to the first end of the tenth power device, and the third end of the ninth power device is connected to the second terminal of the second secondary side of the three-port isolation transformer; the first end of the sixth inductor is connected to the first end of the ninth power device; the first end of the eleventh power device is connected to the third end of the ninth power device; the first end of the twelfth power device is connected to the third end of the tenth power device, and the third end of the twelfth power device is connected to the third end of the eleventh power device; the fifth capacitor is connected between the first end of the sixth inductor and the third end of the twelfth power device; the sixth capacitor is connected between the second end of the sixth inductor and the third end of the twelfth power device.

7. A three-port DCDC reverse pre-charging device, characterized in that, The three-port DCDC reverse pre-charging device includes: a relay switch S1, a relay switch S2, and the three-port DCDC reverse pre-charging circuit according to any one of claims 1-6, where: the relay switch S1 is connected to the output end of the third module and the high-voltage bus capacitor; the relay switch S2 is connected to the output end of the third module.

8. A vehicle, characterized in that, The vehicle includes: the three-port DCDC reverse pre-charging device according to claim 7.

9. A three-port DCDC reverse pre-charging method, implemented based on the three-port DCDC reverse pre-charging device as described in claim 7, characterized in that, Including: When the vehicle receives a high-voltage command or a charging command, the three-port DCDC reverse pre-charging circuit controls the energy of the power battery to flow from the first unit to the third module, and by closing the relay switch S1 and opening the relay switch S2, the pre-charging operation of the high-voltage bus capacitor is realized; After the pre-charging operation is completed, control the main positive relay and the main negative relay to close, and the vehicle completes the high-voltage connection. The three-port DCDC reverse pre-charging circuit controls the energy of the power battery to flow from the first unit to the second module and the third module simultaneously. By disconnecting the relay switch S1 and closing the relay switch S2, the power supply environment for the battery and the low-voltage electrical appliances of the whole vehicle is provided, so that the second module and the third module form a path for redundant low-voltage power supply; When the vehicle receives the low-voltage instruction, the three-port DCDC reverse pre-charging circuit stops the third module from working. By disconnecting both the relay switch S1 and the relay switch S2, it continues to control the energy of the power battery to flow from the first unit to the second module, maintains the always-on power state of the low-voltage power consumption system of the whole vehicle, and reduces the static power consumption of the battery.

10. A chip, characterized in that, Comprising: A memory for storing program code; A processor connected to the memory for reading the program code from the memory to execute the three-port DCDC reverse pre-charging method as claimed in claim 9.

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