Integrated high-voltage DCDC converter for vehicle, high-voltage DC conversion method and vehicle

Abstract

The invention provides an integrated high-voltage DCDC converter for a vehicle. The integrated high-voltage DCDC converter comprises a first circuit and a second circuit, wherein the first circuit comprises an EMI filter circuit, an inverter circuit, an isolating circuit, a rectifying circuit and a first filter circuit which are sequentially connected in series, the EMI filter circuit is connected with a high-voltage direct-current power supply, and the first filter circuit is connected with a first low-voltage direct-current power supply; the second circuit comprises a voltage transformation circuit and a second filter circuit which are connected in series, the first end of the voltage transformation circuit is connected between the first filter circuit and the first low-voltage direct-current power supply, the second end of the voltage transformation circuit is connected with the second filter circuit, and the second filter circuit is connected with a second low-voltage direct-current power supply. After the technical scheme is adopted, two DCDC converters can be integrated in the same DCDC converter, so that the weight and the wire harness of the DCDC converter are reduced, and the production cost and the installation difficulty are reduced; and meanwhile, as the wire harnesses are reduced, the internal arrangement flexibility of the whole vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicles, and particularly to an integrated high-voltage DCDC converter for vehicles, a high-voltage direct current conversion method, and a vehicle. Background Art

[0002] In existing new energy vehicles, 12V and 48V electronic and electrical components are required at the low-voltage load end. In order to supply power to 12V and 48V loads, two DCDC (direct current / direct current) converters are used in the whole vehicle: the first DCDC converter is used to convert the high-voltage direct current of the vehicle's power battery (such as 800VDC or 400VDC) into low-voltage direct current (12VDC) to supply power to 12V loads; the second DCDC converter is used to convert the 12V low-voltage direct current output by the first DCDC converter into 48V low-voltage direct current to supply power to 48V loads.

[0003] The existing technology requires the simultaneous use of two DCDC converters, which has high costs, heavy weight, complex wiring harness connections, and is not convenient for layout inside the vehicle. Summary of the Invention

[0004] In order to overcome the technical defects of the high cost, heavy weight, and complex wiring harness connections of the DCDC converter of the above vehicle, the purpose of the present invention is to provide an integrated high-voltage DCDC converter for vehicles, which is characterized by including a first circuit and a second circuit;

[0005] Wherein, the first circuit includes an EMI filtering circuit, an inverter circuit, an isolation circuit, a rectifier circuit, and a first filtering circuit connected in series in sequence. The EMI filtering circuit is connected to a high-voltage direct current power supply, and the first filtering circuit is connected to a first low-voltage direct current power supply;

[0006] The second circuit includes a voltage transformation circuit and a second filtering circuit connected in series. The first end of the voltage transformation circuit is connected between the first filtering circuit and the first low-voltage direct current power supply, the second end of the voltage transformation circuit is connected to the second filtering circuit, and the second filtering circuit is connected to a second low-voltage direct current power supply.

[0007] The purpose of the present invention is to provide an integrated high-voltage DCDC converter for vehicles, including a first circuit and a second circuit;

[0008] Wherein, the first circuit includes an EMI filtering circuit, an inverter circuit, an isolation circuit, a rectifier circuit, and a first filtering circuit connected in series in sequence. The EMI filtering circuit is connected to a high-voltage direct current power supply, and the first filtering circuit is connected to a first low-voltage direct current power supply;

[0009] The second circuit includes a second isolation circuit, a second rectification circuit, and a second filtering circuit connected in series in sequence. The first end of the second isolation circuit is connected between the inverter circuit and the isolation circuit. The second end of the second isolation circuit is connected to the second rectification circuit. The second rectification circuit is connected in series between the second isolation circuit and the second filtering circuit and is connected between the first filtering circuit and the first low-voltage DC power supply. The second filtering circuit is connected to the second low-voltage DC power supply.

[0010] The object of the present invention is to provide an integrated high-voltage DCDC converter for vehicles, including a first circuit and a second circuit;

[0011] Among them, the first circuit includes an EMI filtering circuit, an inverter circuit, an isolation circuit, a rectification circuit, and a first filtering circuit connected in series in sequence. The EMI filtering circuit is connected to the high-voltage DC power supply, and the first filtering circuit is connected to the first low-voltage DC power supply; the second circuit includes a second rectification circuit and a second filtering circuit connected in series in sequence. The first end of the second rectification circuit is connected between the isolation circuit and the rectification circuit, the second end of the second rectification circuit is connected to the second filtering circuit, and the second filtering circuit is connected to the second low-voltage DC power supply.

[0012] Preferably, the above-mentioned integrated high-voltage DCDC converter for vehicles further includes a communication circuit, a collection circuit, a control circuit, and a drive circuit.

[0013] The communication circuit includes a CAN transceiver, which is communicatively connected to the integrated high-voltage DCDC and is used to receive vehicle commands.

[0014] The collection circuit is used to collect the real-time data of the integrated high-voltage DCDC. The real-time data includes the real-time voltages and currents of the high-voltage DC power supply, the first low-voltage DC power supply, and the second low-voltage DC power supply.

[0015] The control circuit includes a front-end MCU and a drive MCU. The front-end MCU is respectively connected to the collection circuit, the communication circuit, and is connected to the drive MCU; the drive MCU is used to receive the working instructions issued by the front-end MCU and the real-time data issued by the collection circuit and generate corresponding working instructions.

[0016] The drive circuit, which is communicatively connected to the drive MCU, is used to control the inverter circuit, the rectification circuit, and the voltage transformation circuit.

[0017] Preferably, the acquisition circuit is respectively connected to the first circuit and the second circuit for acquiring real-time data of the integrated high-voltage DCDC. The front-end MCU is connected to the acquisition circuit and sends the real-time data to the communication circuit, and the communication circuit is connected to the vehicle communication.

[0018] The front-end MCU is communicatively connected to the communication circuit and the acquisition circuit. The communication circuit sends the first working instruction of the vehicle to the front-end MCU, and the acquisition circuit sends the real-time data to the front-end MCU. The front-end MCU generates a second working instruction according to the first working instruction and the real-time data.

[0019] The driving MCU includes a first driving MCU and a second driving MCU. The first driving MCU is used for receiving the second working instruction and correspondingly generating a first driving instruction, and the second driving MCU is used for receiving the second working instruction and correspondingly generating a second driving instruction.

[0020] The driving circuit includes a first driving circuit and a second driving circuit. The first driving circuit is connected to the first driving MCU, is used for receiving the first driving instruction, and is connected to the inverter circuit and the rectifier circuit to send the first driving instruction to the inverter circuit and the rectifier circuit. The second driving circuit is connected to the second driving MCU, is used for receiving the second driving instruction, and is connected to the voltage transformation circuit to send the second driving instruction to the voltage transformation circuit.

[0021] Preferably, it further includes an auxiliary power supply for supplying power to the front-end MCU, the driving MCU, the driving circuit, the acquisition circuit, and the CAN transceiver.

[0022] Preferably, the high-voltage DC power supply is the vehicle's vehicle-mounted power battery power supply.

[0023] The first low-voltage DC power supply is a 48V power supply, and the second low-voltage DC power supply is a 12V power supply; or,

[0024] The first low-voltage DC power supply is a 12V power supply, and the second low-voltage DC power supply is a 48V power supply.

[0025] On the other hand, the present invention provides a method for converting high-voltage direct current for a vehicle, using the integrated high-voltage DCDC converter for a vehicle as described in any one of the above.

[0026] Preferably, the communication circuit receives the first working instruction issued by the vehicle, sends the first working instruction to the front-end MCU, the acquisition circuit acquires the current real-time data of the integrated high-voltage DCDC converter, and sends the real-time data to the front-end MCU.

[0027] The front - end MCU receives the first working instruction and the real - time data, generates a second working instruction accordingly, and sends the second working instruction to the driving MCU;

[0028] The driving MCU receives the second working instruction and generates a driving instruction;

[0029] The driving circuit receives the driving instruction and drives the first circuit and the second circuit.

[0030] On the other hand, the present invention provides a vehicle using the integrated high - voltage DCDC converter for a vehicle as described in any one of the above.

[0031] After adopting the technical solution of the present invention, compared with the prior art, the following beneficial effects are achieved: it can integrate two DCDC converters into the same DCDC converter, reduce the weight and wiring harness of the DCDC converter, lower the production cost and installation difficulty; at the same time, due to the reduction of the wiring harness, the layout flexibility inside the whole vehicle is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 FIG. is a schematic diagram of an integrated high - voltage DCDC converter for a vehicle according to an embodiment of the present invention;

[0033] Figure 2 FIG. is another schematic diagram of an integrated high - voltage DCDC converter for a vehicle according to an embodiment of the present invention;

[0034] Figure 3 FIG. is another schematic diagram of an integrated high - voltage DCDC converter for a vehicle according to an embodiment of the present invention;

[0035] Figure 4 FIG. is a schematic diagram of a high - voltage direct - current conversion method for a vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The advantages of the present invention are further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0037] 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 present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0038] The terms used in this disclosure are for the purpose of describing particular embodiments only and are not intended to limit the disclosure. The singular forms "a", "the", and "said" used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly dictates 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.

[0039] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this disclosure, 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 word "if" as used herein may be interpreted as "when" or "while" or "in response to determining".

[0040] In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a mechanical connection or an electrical connection, or it may be the communication inside two components. It may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms may be understood according to specific circumstances.

[0041] In the following description, the suffixes such as "module", "component", or "unit" used to denote elements are only for the convenience of describing the present invention and have no specific meaning in themselves. Therefore, "module" and "component" may be used interchangeably.

[0042] An embodiment of the present invention provides an integrated high-voltage DCDC converter for a vehicle, including a first circuit and a second circuit; wherein, the first circuit is connected to a high-voltage DC power supply and includes an EMI filter circuit, an inverter circuit, an isolation circuit, a rectifier circuit, and a first filter circuit connected in series in sequence, and the first filter circuit is connected to a first low-voltage DC power supply; the second circuit includes a transformer circuit and a second filter circuit connected in series, a first end of the transformer circuit is connected to the first filter circuit, a second end is connected to the second filter circuit, and is connected to a second low-voltage DC power supply via the second filter circuit.

[0043] In this embodiment, since the voltage conversion circuit of the second circuit is connected between the first filter circuit and the first low-voltage DC power supply, the first low-voltage direct current output by the first circuit is the power input current of the second circuit. Thus, the first circuit can realize the conversion from high-voltage direct current to the first low-voltage direct current; the second circuit realizes the conversion from the first low-voltage direct current to the second low-voltage direct current, and this part of the circuit consists of a voltage conversion circuit, a second filter circuit, etc. Thus, the hardware device that uses another DCDC converter to convert 12V low-voltage direct current to 48V low-voltage direct current in the prior art can be simplified.

[0044] Moreover, in this embodiment, both the first and second circuits have a bidirectional conversion function. The first circuit can realize the conversion from the first low-voltage direct current to high-voltage direct current, and the second circuit can realize the conversion from the second low-voltage direct current to the first low-voltage direct current.

[0045] In other embodiments, as Figure 2 shown, the second circuit includes a second isolation circuit, a second rectification circuit and a second filter circuit connected in series in sequence. The first end of the second isolation circuit is connected between the inverter circuit and the isolation circuit, the second end of the second isolation circuit is connected to the second rectification circuit, the second rectification circuit is connected in series between the second isolation circuit and the second filter circuit, and is connected between the first filter circuit and the first low-voltage DC power supply, and the second filter circuit is connected to the second low-voltage DC power supply.

[0046] Alternatively, in another other embodiment, as Figure 3 shown, the second circuit includes a second rectification circuit and a second filter circuit connected in series in sequence. The first end of the second rectification circuit is connected between the isolation circuit and the rectification circuit, the second end of the second rectification circuit is connected to the second filter circuit, and the second filter circuit is connected to the second low-voltage DC power supply.

[0047] In the above three embodiments, in terms of function, the second circuit is connected in series with a part of the circuit in the first circuit, integrating two DCDC converters in the prior art into the same DCDC converter, which can effectively reduce the electronic components used in the integrated high-voltage DCDC converter and reduce the production cost of the DCDC converter.

[0048] It should be further noted that the EMI filtering circuit in the present invention is used to suppress electromagnetic interference and clutter by utilizing the characteristics of inductors and capacitors. The inverter circuit is used to convert the direct current provided by the high-voltage direct current power supply into alternating current with a fixed frequency and voltage or variable frequency and voltage regulation. The isolation circuit is used to convert the primary alternating current into another value of alternating current with the same frequency on the secondary side through magnetic energy conversion by using a transformer, and the magnetic energy conversion can play a role in isolating the primary and secondary circuits. The rectifier circuit is used to convert alternating current into unidirectional pulsating direct current. The filtering circuit mainly refers to filtering and voltage stabilizing the rectified direct current to reduce the pressure difference between the peak and valley of the wave. The above circuits and functions are common circuits in the art, and the specific electronic component composition of the present invention is not specifically limited herein.

[0049] Figure 1 FIG. is a schematic diagram of an integrated high-voltage DCDC converter for a vehicle in an embodiment of the present invention. In this embodiment, the integrated high-voltage DCDC converter includes a first circuit and a second circuit. The first circuit is connected to the high-voltage direct current power supply and includes an EMI filtering circuit, an inverter circuit, an isolation circuit, a rectifier circuit, and a first filtering circuit connected in series in sequence. The first filtering circuit is connected to the first low-voltage direct current power supply. The second circuit includes a transformer circuit and a second filtering circuit connected in series. The first end of the transformer circuit is connected between the first filtering circuit and the first low-voltage direct current power supply, the second end of the transformer circuit is connected to the second filtering circuit, and the second filtering circuit is connected to the second low-voltage direct current power supply.

[0050] At the same time, it also includes a communication circuit, a collection circuit, a control circuit, and a drive circuit. The communication circuit includes a CAN transceiver, which is communicatively connected to the integrated high-voltage DCDC and is used to receive the working instructions of the whole vehicle. At the same time, it can also send data, signals, etc. to the whole vehicle. The communication circuit can realize the two-way signal data transmission and exchange between the integrated high-voltage DCDC converter and the vehicle.

[0051] The collection circuit is used to collect the real-time data of the integrated high-voltage DCDC. The real-time data includes the real-time voltage and current of the high-voltage direct current power supply, the first low-voltage direct current power supply, and the second low-voltage direct current power supply. In the actual circuit, the collection circuit will also collect the current temperature of the circuit or device that generates heat during operation, such as the MOS tubes in the inverter circuit, the rectifier circuit, and the transformer circuit, and the transformer in the isolation circuit, etc. The present invention does not make further limitations herein. The control circuit includes a front-end MCU and a drive MCU. The front-end MCU is respectively connected to the collection circuit, the communication circuit, and is connected to the drive MCU. The drive MCU is used to receive the working instructions sent by the front-end MCU and the real-time data sent by the collection circuit, and generate corresponding working instructions.

[0052] The driving circuit is communicatively connected to the driving MCU and is used to control the inverter circuit, the rectifier circuit, and the voltage transformation circuit.

[0053] It should be noted that the acquisition circuit, the control circuit, etc. in the present invention do not limit the actually used electronic components, as long as they can realize the functions of corresponding signal acquisition and the driving circuit.

[0054] Specifically, in this embodiment, the acquisition circuit is respectively connected to the first circuit and the second circuit and is used to acquire the real-time data of the integrated high-voltage DCDC. The front-end MCU is connected to the acquisition circuit and sends the real-time data to the communication circuit, and the communication circuit is communicatively connected to the whole vehicle;

[0055] The front-end MCU is communicatively connected to the communication circuit and the acquisition circuit. The communication circuit sends the first working instruction of the whole vehicle to the front-end MCU, and the acquisition circuit sends the real-time data to the front-end MCU. The front-end MCU generates a second working instruction according to the first working instruction and the real-time data. That is, the front-end MCU in this embodiment calculates the next working mode and operation parameters of this integrated high-voltage DCDC according to the whole vehicle working instruction received by the CAN transceiver and the various real-time data fed back by the acquisition circuit, and transmits the working instruction to the two driving MCUs.

[0056] The driving MCU includes a first driving MCU and a second driving MCU. The first driving MCU is used to receive the second working instruction and correspondingly generate a first driving instruction, and the second driving MCU is used to receive the second working instruction and correspondingly generate a second driving instruction.

[0057] The driving circuit includes a first driving circuit and a second driving circuit. The first driving circuit is connected to the first driving MCU, is used to receive the first driving instruction, and is connected to the inverter circuit and the rectifier circuit, and sends the first driving instruction to the inverter circuit and the rectifier circuit; the second driving circuit is connected to the second driving MCU, is used to receive the second driving instruction, and is connected to the voltage transformation circuit, and sends the second driving instruction to the voltage transformation circuit. That is, the two driving MCUs in this embodiment generate corresponding driving signals according to the received working mode and parameter requests, and after the driving ability is improved by the driving circuit, they respectively control the inverter circuit, the rectifier circuit, and the voltage transformation circuit.

[0058] The integrated high-voltage DCDC converter in this embodiment further includes an auxiliary circuit, which is used to provide power for the front-end MCU, the driving MCU, the driving circuit, the acquisition circuit, and the CAN transceiver.

[0059] In other embodiments, the first circuit and the second circuit in the integrated high-voltage DCDC converter not only share a CAN transceiver (communication circuit), an auxiliary circuit, an acquisition circuit, and a control circuit, but also share the same housing and cooling system, further reducing the volume of the high-voltage DCDC converter, simplifying the wiring harness connection, providing more choices for the interior space design of the vehicle, and at the same time being able to reduce the production cost and lower the production cost.

[0060] The above embodiments are applied to a vehicle, where the high-voltage DC power supply is the vehicle's vehicle-mounted power battery power supply; the first low-voltage DC power supply is a 48V power supply; the second low-voltage DC power supply is a 12V power supply. Since both the first circuit and the second circuit can work bidirectionally, in other embodiments, the first low-voltage DC power supply is a 12V power supply, and the second low-voltage DC power supply is a 48V power supply. Therefore, the integrated high-voltage DCDC converter in the above embodiments can supply power to 12V and 48V electronic and electrical components at the same time.

[0061] Correspondingly, in another embodiment of the present invention, a method for converting high-voltage direct current for a vehicle is provided, using the integrated high-voltage DCDC converter for a vehicle in the above embodiments. As Figure 4 shown, it is a flowchart of a method for converting high-voltage direct current for a vehicle in another embodiment of the present invention. It includes:

[0062] The communication circuit receives the first working instruction sent by the vehicle, sends the first working instruction to the front-end MCU, the acquisition circuit acquires the current real-time data of the integrated high-voltage DCDC converter, and sends the real-time data to the front-end MCU;

[0063] The front-end MCU receives the first working instruction and the real-time data, correspondingly generates a second working instruction, and sends the second working instruction to the drive MCU;

[0064] The drive MCU receives the second working instruction and generates a drive instruction;

[0065] The drive circuit receives the drive instruction and drives the first circuit and the second circuit.

[0066] In other embodiments, before the integrated high-voltage DCDC converter starts to work, the vehicle first provides it with an external low-voltage power supply and CAN communication. After the integrated high-voltage DCDC converter self-checks without faults, it transmits the information of no self-check faults to the vehicle through CAN communication. After receiving that the integrated high-voltage DCDC converter has no self-check faults, the vehicle provides it with an external high-voltage power supply, and at the same time transmits the first instruction signals such as the working mode and operation parameter request of the integrated high-voltage DCDC converter through CAN communication.

[0067] In another embodiment of the present invention, a vehicle is provided, which is equipped with the integrated high-voltage DCDC converter for vehicles described in the above embodiment, and its technical features are the same as those of the integrated high-voltage DCDC converter for vehicles, and the present invention will not be elaborated herein.

[0068] It should be noted that the embodiments of the present invention have good implementability and do not impose any form of limitation on the present invention. Any person skilled in the art may use the technical content disclosed above to modify or transform it into an equivalent effective embodiment. However, as long as the content does not depart from the technical solution of the present invention, any modification, equivalent change or modification made to the above embodiments based on the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. An integrated high-voltage DC-DC converter for a vehicle, characterized in that, It includes a first circuit and a second circuit; Among them, the first circuit includes an EMI filter circuit, an inverter circuit, an isolation circuit, a rectifier circuit, and a first filter circuit connected in series in sequence. The EMI filter circuit is connected to a high-voltage DC power supply, and the first filter circuit is connected to a first low-voltage DC power supply; The second circuit includes a transformer circuit and a second filter circuit connected in series. The first end of the transformer circuit is connected between the first filter circuit and the first low-voltage DC power supply, the second end of the transformer circuit is connected to the second filter circuit, and the second filter circuit is connected to a second low-voltage DC power supply.

2. An integrated high-voltage DC-DC converter for a vehicle, characterized in that, It includes a first circuit and a second circuit; Among them, the first circuit includes an EMI filter circuit, an inverter circuit, an isolation circuit, a rectifier circuit, and a first filter circuit connected in series in sequence. The EMI filter circuit is connected to a high-voltage DC power supply, and the first filter circuit is connected to a first low-voltage DC power supply; The second circuit includes a second isolation circuit, a second rectifier circuit, and a second filter circuit connected in series in sequence. The first end of the second isolation circuit is connected between the inverter circuit and the isolation circuit, the second end of the second isolation circuit is connected to the second rectifier circuit, the second rectifier circuit is connected in series between the second isolation circuit and the second filter circuit and is connected between the first filter circuit and the first low-voltage DC power supply, and the second filter circuit is connected to a second low-voltage DC power supply.

3. An integrated high-voltage DC-DC converter for a vehicle, characterized in that, It includes a first circuit and a second circuit; among them, the first circuit includes an EMI filter circuit, an inverter circuit, an isolation circuit, a rectifier circuit, and a first filter circuit connected in series in sequence. The EMI filter circuit is connected to a high-voltage DC power supply, and the first filter circuit is connected to a first low-voltage DC power supply; the second circuit includes a second rectifier circuit and a second filter circuit connected in series in sequence. The first end of the second rectifier circuit is connected between the isolation circuit and the rectifier circuit, the second end of the second rectifier circuit is connected to the second filter circuit, and the second filter circuit is connected to a second low-voltage DC power supply.

4. The integrated high-voltage DC-DC converter for a vehicle according to any one of claims 1-3, characterized in that, It further includes a communication circuit, a collection circuit, a control circuit, and a drive circuit, The communication circuit includes a CAN transceiver, which is communicatively connected to the integrated high-voltage DCDC and is used to receive vehicle commands; The collection circuit is used to collect the real-time data of the integrated high-voltage DCDC. The real-time data includes the real-time voltages and currents of the high-voltage DC power supply, the first low-voltage DC power supply, and the second low-voltage DC power supply; The control circuit includes a front-end MCU and a drive MCU. The front-end MCU is respectively connected to the collection circuit, the communication circuit, and is connected to the drive MCU; the drive MCU is used to receive the working commands sent by the front-end MCU and the real-time data sent by the collection circuit, and generate corresponding working commands; The drive circuit, which is communicatively connected to the drive MCU, is used to control the inverter circuit, the rectifier circuit, and the transformer circuit.

5. The integrated high-voltage DC-DC converter for a vehicle according to claim 4, characterized in that, The acquisition circuit is respectively connected to the first circuit and the second circuit, and is used to acquire the real-time data of the integrated high-voltage DCDC. The front-end MCU is connected to the acquisition circuit and sends the real-time data to the communication circuit, and the communication circuit is connected to the vehicle communication. The front-end MCU is communicatively connected to the communication circuit and the acquisition circuit. The communication circuit sends the first working instruction of the vehicle to the front-end MCU, and the acquisition circuit sends the real-time data to the front-end MCU. The front-end MCU generates a second working instruction according to the first working instruction and the real-time data. The driving MCU includes a first driving MCU and a second driving MCU. The first driving MCU is used to receive the second working instruction and correspondingly generate a first driving instruction, and the second driving MCU is used to receive the second working instruction and correspondingly generate a second driving instruction. The driving circuit includes a first driving circuit and a second driving circuit. The first driving circuit is connected to the first driving MCU, is used to receive the first driving instruction, and is connected to the inverter circuit and the rectifier circuit, and sends the first driving instruction to the inverter circuit and the rectifier circuit; the second driving circuit is connected to the second driving MCU, is used to receive the second driving instruction, and is connected to the voltage transformation circuit, and sends the second driving instruction to the voltage transformation circuit.

6. The integrated high-voltage DC-DC converter for a vehicle according to claim 5, characterized in that, It further includes an auxiliary power supply, which is used to supply power to the front-end MCU, the driving MCU, the driving circuit, the acquisition circuit, and the CAN transceiver.

7. The integrated high-voltage DC-DC converter for a vehicle according to claim 6, characterized in that, The high-voltage DC power supply is the vehicle's vehicle-mounted power battery power supply. The first low-voltage DC power supply is a 48V power supply, and the second low-voltage DC power supply is a 12V power supply; or, The first low-voltage DC power supply is a 12V power supply, and the second low-voltage DC power supply is a 48V power supply.

8. A method for converting high-voltage direct current for a vehicle, characterized in that, Use the integrated high-voltage DCDC converter for vehicles according to any one of claims 1-7.

9. The method for converting high-voltage direct current for a vehicle according to claim 8, characterized in that, It includes: The communication circuit receives the first working instruction issued by the vehicle, sends the first working instruction to the front-end MCU, and the acquisition circuit acquires the current real-time data of the integrated high-voltage DCDC converter and sends the real-time data to the front-end MCU. The front-end MCU receives the first working instruction and the real-time data, correspondingly generates a second working instruction, and sends the second working instruction to the driving MCU. The driving MCU receives the second working instruction and generates a driving instruction. The driving circuit receives the driving instruction and drives the first circuit and the second circuit.

10. A vehicle, characterized in that, Use the integrated high-voltage DCDC converter for vehicles according to any one of claims 1-7.

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