A European standard AC / DC charging integrated system and a control method thereof

Abstract

The present application relates to the technical field of vehicles, in particular to a European standard AC / DC charging integrated system and a control method thereof. The system comprises an OBC module, a DCDC module and a communication protocol conversion module. The OBC module is internally provided with a first MCU module, the DCDC module is internally provided with a second MCU module, and the communication protocol conversion module is internally provided with a PLC MCU module and a third MCU module. The first MCU module is used for realizing digital control of the OBC module. The second MCU module is used for realizing logic control of the OBC module and DCDC control. The third MCU module is used for communicating with the PLC MCU module and the second MCU module, realizing processing and transmission of European standard DC charging information. The PLC MCU module is used for converting a PLC signal into an SPI signal and communicating with the third MCU module. The system integrates the PLC communication protocol conversion function, can complete communication with a DC pile and control a relay to realize a DC charging function.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, specifically to a European standard AC / DC charging integrated system and its control method. Background Technology

[0002] Currently, the domestic new energy vehicle industry uses independent ECU modules to complete the communication between the vehicle and the European standard DC charging pile, achieving DC charging functionality through cooperation with other ECUs. For example... Figure 1 The communication protocol converter shown is currently used in the industry as an OBC (on-board charger) and DC-DC converter, which are two independent ECUs. The two modules communicate independently with the vehicle via CAN, which increases the load on the vehicle network.

[0003] Existing charging solutions have the following drawbacks:

[0004] 1) The vehicle needs to have a separate ECU to complete the communication protocol conversion. The compatibility verification of this ECU module with other ECUs in the vehicle must be completed during the development phase.

[0005] 2) When both OBC and DC-DC communicate with the vehicle simultaneously, the network load rate increases, which can easily lead to excessive network load and signal loss, resulting in unpredictable vehicle malfunctions. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a European standard AC / DC charging integrated system and its control method. This system integrates PLC communication protocol conversion functionality, enabling communication with DC charging piles and controlling relays to achieve DC charging. Simultaneously, the OBC (On-Board Charger) communicates with the vehicle via the DC-DC converter. The OBC and DC-DC converter transmit signals through internal CAN communication, reducing the vehicle's network load and ensuring the integrity and security of vehicle communication.

[0007] The present invention provides a European standard AC / DC charging integrated system, comprising an OBC module, a DC-DC module, and a communication protocol conversion module. The OBC module contains a first MCU module, the DC-DC module contains a second MCU module, and the communication protocol conversion module contains a PLC MCU module and a third MCU module.

[0008] The first MCU module is used to implement digital control of the OBC module, including communicating with the second MCU module during AC charging and driving the internal power devices of the OBC module to achieve AC / DC conversion;

[0009] The second MCU module is used to implement the logic control and DC-DC control of the OBC module, including detecting the AC charging gun signal and sending a charging command to the first MCU module during AC charging, and driving the internal power devices of the DC-DC module to realize DC / DC conversion, or communicating with the third MCU module during DC charging and driving the internal power devices of the DC-DC module to realize DC charging and DC / DC conversion;

[0010] The third MCU module is used to communicate with the PLC MCU module and the second MCU module to process and transmit European standard DC charging information;

[0011] The PLC MCU module is used to convert PLC signals into SPI signals and communicate with the third MCU module.

[0012] Preferably, the communication between the OBC module and the DC-DC module is achieved through the first MCU module and the second MCU module, and the first MCU module and the second MCU module communicate through an internal CAN network.

[0013] Preferably, the PLC MCU module communicates with the European standard DC charging pile through a 1:1:1 isolation transformer.

[0014] Preferably, the PLC MCU module and the third MCU module are connected, as are the third MCU module and the second MCU module, via an SPI interface.

[0015] The present invention also provides an AC charging control method for the European standard AC / DC integrated charging system as described above, the AC charging control method comprising:

[0016] After the second MCU module recognizes the AC charging gun signal, it feeds back the gun status and CP status to the vehicle network.

[0017] After receiving the vehicle charging request, the second MCU module closes the charging ready switch S2 and sends a charging command to the first MCU module.

[0018] The charging pile detects that the CP voltage amplitude is a specified value and outputs high-voltage AC power.

[0019] After receiving the charging command sent by the second MCU module, the first MCU module performs pre-charging and self-test;

[0020] After the pre-charge and self-test are completed, the first MCU module drives the power devices inside the OBC module to work, so that the OBC module outputs DC high voltage according to the voltage and current values ​​given by the second MCU module;

[0021] The second MCU module controls the power devices inside the DCDC module to convert the high-voltage DC output from the OBC module into a low-voltage DC output.

[0022] When the second MCU module detects that the charging gun has been disconnected or receives a stop charging command from the vehicle, the second MCU module sends a stop charging command to the first MCU module.

[0023] The more preferred options also include:

[0024] When the first MCU module drives the power devices inside the OBC module to work, the first MCU module sends the detected voltage and current information to the second MCU module, and the second MCU module sends the received voltage and current information to the vehicle network.

[0025] When the first MCU module controls the power devices inside the OBC module to stop working, the first MCU module feeds back the working status to the second MCU module.

[0026] The second MCU module sends the operating status to the vehicle network.

[0027] The present invention also provides a DC / DC conversion control method for the European standard AC / DC charging integrated system as described above, the DC / DC conversion control method comprising:

[0028] After receiving the working command from the vehicle, the second MCU module detects and judges the voltage at the input and output terminals, and performs a self-test.

[0029] After the second MCU module determines that the working conditions are met, it controls the power devices inside the DC-DC module to work and output low-voltage DC power to the outside.

[0030] The more preferred options also include:

[0031] The second MCU module monitors the voltage and current on the high and low voltage sides;

[0032] When the second MCU module detects a fault that causes the DCDC module to malfunction, it controls the power devices inside the DCDC module to stop working and outputs an alarm signal to the vehicle network.

[0033] When the second MCU module receives a stop command from the DCDC module, it controls the power devices inside the DCDC module to stop working and reports its own working status to the vehicle network.

[0034] The present invention also provides a DC charging control method for the European standard AC / DC charging integrated system as described above, the DC charging control method comprising:

[0035] After the second MCU module detects the DC charging gun insertion signal, it locks the charging gun.

[0036] The PLC MCU module converts the PLC signals sent from the charging pile into SPI signals and the CAN signals from the vehicle into PLC signals.

[0037] The third MCU module obtains vehicle-side information through the second MCU module and charging pile-side information through the PLC MCU module. It processes and transmits these signals to complete the charging information interaction between the charging pile and the vehicle. The PLC signal is converted into an SPI signal and then sent to the second MCU module via the third MCU module.

[0038] Once the vehicle meets the DC charging conditions, the second MCU module closes the charging ready switch S2.

[0039] After detecting the charging ready signal, the European standard DC charging pile releases high-voltage DC power.

[0040] After receiving the request signal from the vehicle to close the DC charging relay, the second MCU module closes the DC charging relay to realize DC charging.

[0041] Preferably, when the second MCU module detects that the duty cycle of the CP signal is a preset duty cycle, it determines that the DC charging gun has been inserted.

[0042] The beneficial effects of this invention are as follows:

[0043] 1. This invention includes a communication protocol conversion module, which contains a PLC MCU module and a third MCU module. The third MCU module communicates with the PLC MCU module and the second MCU module to process and transmit European standard DC charging information. The PLC MCU module converts PLC signals into SPI signals and communicates with the third MCU module. This system integrates PLC communication protocol conversion functionality, enabling communication with the DC charging station and controlling relays to achieve DC charging. This invention also includes an OBC module and a DC-DC converter module. The OBC module contains a first MCU module, and the DC-DC converter module contains a second MCU module. The OBC communicates with the vehicle via the DC-DC converter. The OBC and DC-DC converter transmit signals via internal CAN communication, reducing the vehicle network load and ensuring complete and secure vehicle communication.

[0044] 2. This invention features a highly integrated product, combining the DC functions of OBC / DCDC and BMS into one unit. Regarding DC charging, it reduces the need for compatibility verification of multiple ECUs (OBC+BMS+CPLC) during the vehicle development phase.

[0045] 3. The use of this product eliminates the need for a separate dedicated communication protocol conversion module in the vehicle, reducing the overall vehicle cost. Attached Figure Description

[0046] Figure 1 A schematic diagram of the hardware architecture of an existing charging system;

[0047] Figure 2 This is a schematic diagram of the system architecture of the present invention;

[0048] Figure 3 This is a schematic diagram showing the connection between the PLC MCU module and the second and third MCU modules of the present invention;

[0049] Figure 4 This is a circuit diagram illustrating how the PLC / MCU module of this invention interacts with the charging pile. Detailed Implementation

[0050] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0052] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0053] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0054] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0055] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0056] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0057] References to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized. "A plurality" means "two or more."

[0058] Example 1

[0059] Figure 2 A schematic diagram of a European standard AC / DC charging integrated system according to a preferred embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and are described in detail below:

[0060] This invention discloses a European standard AC / DC charging integrated system, comprising an OBC module, a DC-DC converter module, and a communication protocol conversion module. The OBC module contains a first MCU module, the DC-DC converter module contains a second MCU module, and the communication protocol conversion module contains a PLC MCU module and a third MCU module. The European standard AC / DC charging integrated system formed by these three modules can achieve three functions:

[0061] AC charging function: Converts AC mains power into high-voltage DC power to charge the power battery;

[0062] DC charging function: By communicating with European standard DC charging piles, the power battery is charged with the high-voltage DC power output from them;

[0063] DC / DC conversion function: Converts the high-voltage DC power from the power battery into 14V low-voltage DC power to supply power to the small battery and the low-voltage load of the vehicle.

[0064] During AC charging, the first MCU and the second MCU work together to realize AC charging and DC / DC conversion functions, ensuring the voltage of the small battery remains stable during AC charging.

[0065] During DC charging, the second and third MCUs work together to achieve DC charging and DC / DC conversion functions, ensuring stable battery voltage during DC charging.

[0066] When the DC / DC converter operates independently, the second MCU acquires and processes relevant internal and external signals to ensure the normal and safe operation of the DC / DC conversion function.

[0067] The first MCU is responsible for the digital control of the OBC (On-Board Charger), the second MCU is responsible for the logic control of the OBC and DC-DC converter control, and the third MCU is responsible for processing and transmitting European standard DC charging information, completing the communication between the DC charging pile and the vehicle. The second MCU is responsible for communication with the vehicle. The first MCU communicates with the second MCU via its internal CAN bus to complete information exchange and logic control during AC charging. The third MCU receives and processes signals sent by the DC charging pile, converting them into SPI communication, and communicates with the second MCU via its internal SPI bus to realize relevant information exchange and logic control during DC charging.

[0068] In one embodiment, the first MCU module is used to implement digital control of the OBC module, including communicating with the second MCU module during AC charging and driving the internal power devices of the OBC module to achieve AC / DC conversion;

[0069] The second MCU module is used to implement the logic control and DC-DC control of the OBC module, including detecting the AC charging gun signal and sending a charging command to the first MCU module during AC charging, and driving the internal power devices of the DC-DC module to realize DC / DC conversion, or communicating with the third MCU module during DC charging and driving the internal power devices of the DC-DC module to realize DC charging and DC / DC conversion.

[0070] The third MCU module is used to communicate with the PLC MCU module and the second MCU module to process and transmit European standard DC charging information;

[0071] The PLC MCU module is used to convert PLC signals into SPI signals and communicate with the third MCU module.

[0072] In one embodiment, communication between the OBC module and the DC-DC module is achieved through the first MCU module and the second MCU module, which communicate via a CAN network.

[0073] In one embodiment, the PLC MCU module communicates with the European standard DC charging pile via a 1:1:1 isolation transformer.

[0074] In one embodiment, the PLC MCU module is connected to the third MCU module, and the third MCU module is connected to the second MCU module via an SPI interface.

[0075] Example 2

[0076] This embodiment also provides an AC charging control method for the European standard AC / DC integrated charging system described above. During AC charging, the first MCU and the second MCU cooperate to implement AC charging and DC-DC conversion functions, ensuring the stability of the small battery voltage during AC charging. Specifically, the second MCU is responsible for acquiring and processing internal and external signals, controlling internal power devices, confirming charging conditions, and performing DC-DC conversion. The first MCU is responsible for controlling the power devices inside the OBC, converting AC power to DC power. The specific logic is as follows:

[0077] Step 1: After the second MCU module identifies the AC charging gun signal through the PP resistance value and CP voltage amplitude, it controls the electronic lock to lock the charging gun, and determines the maximum power of the input terminal through the PP resistance value and CP duty cycle, and feeds back the charging gun status and CP status to the vehicle network.

[0078] Step 2: After receiving the vehicle charging request, the second MCU module closes the charging ready switch S2. At this time, the CP voltage amplitude becomes 6V and sends a charging command to the first MCU module.

[0079] Step 3: The charging pile detects that the CP voltage amplitude is a specified amplitude, which is 6V in this embodiment, and outputs AC high voltage.

[0080] Step 4: After receiving the charging command sent by the second MCU module, the first MCU module performs pre-charging and self-test.

[0081] Step 5: After the pre-charge and self-test are completed, the first MCU module drives the internal power devices of the OBC module to work, so that the OBC module outputs DC high voltage according to the voltage and current values ​​given by the second MCU module;

[0082] Step 6: The second MCU module controls the power devices inside the DCDC module to work, so that the DC high voltage output from the OBC module is converted into DC low voltage output.

[0083] Step 7: When the second MCU module detects that the charging gun has been unplugged or receives a stop charging command from the vehicle, the second MCU module sends a stop charging command to the first MCU module.

[0084] In one embodiment, it also includes:

[0085] When the first MCU module drives the power devices inside the OBC module to work, the first MCU module sends the detected voltage and current information to the second MCU module, and the second MCU module sends the received voltage and current information to the vehicle network.

[0086] When the first MCU module controls the power devices inside the OBC module to stop working, the first MCU module feeds back the working status to the second MCU module.

[0087] The second MCU module sends the operating status to the vehicle network.

[0088] Example 3

[0089] This embodiment also provides a DC / DC conversion control method for the European standard AC / DC charging integrated system as described above. When the DC-DC converter operates independently, the second MCU acquires and processes relevant internal and external signals to ensure the normal and safe operation of the DC-DC conversion function. This DC / DC conversion control method includes:

[0090] Step 1: After receiving the working command from the vehicle, the second MCU module detects and judges the voltage at the input and output terminals, and performs a self-test.

[0091] Step 2: After the second MCU module determines that the working conditions are met, it controls the power devices inside the DC-DC module to work and output low-voltage DC power to the outside.

[0092] In one embodiment, it also includes:

[0093] The second MCU module monitors the voltage and current on the high and low voltage sides;

[0094] When the second MCU module detects a fault that causes the DCDC module to malfunction, it controls the power devices inside the DCDC module to stop working and outputs an alarm signal to the vehicle network.

[0095] When the second MCU module receives a stop command from the DCDC module, it controls the power devices inside the DCDC module to stop working and reports its own working status to the vehicle network.

[0096] Example 4

[0097] This embodiment also provides a DC charging control method for the European standard AC / DC integrated charging system as described above. During DC charging, the second MCU and the third MCU cooperate to realize DC charging and DC-DC conversion functions, ensuring the stability of the small battery voltage during DC charging. The second MCU is responsible for the acquisition and processing of internal and external signals, controlling internal power devices, confirming charging conditions, and performing DC-DC conversion. The PLC MCU converts the PLC signal emitted by the European standard DC charging pile into an SPI signal and transmits this signal to the third MCU through internal SPI1. The third MCU processes the signal and controls the corresponding electronic devices through the second MCU. At the same time, the third MCU transmits the signal transmitted by the second MCU to the PLC MCU through internal SPI2, converts it into a PLC signal, and sends it to the DC charging pile, completing the communication between the vehicle and the DC charging pile and realizing the DC charging function.

[0098] like Figure 3 As shown, the PLC control chip used in this design is QCA7005, which can directly convert PLC signals into digital signals that can interact with the microcontroller. The PLC control chip and the microcontroller (third MCU) are connected via an SPI interface.

[0099] like Figure 4 As shown, the PLC signal of the European standard DC charging pile is transmitted to this product through the CP and PE signal lines. This product uses a 1:1:1 isolation transformer to realize the data interaction between the European standard DC charging pile and the PLC chip.

[0100] The DC charging control method provided in this embodiment includes:

[0101] After the second MCU module detects the DC charging gun insertion signal, it locks the charging gun.

[0102] The PLC MCU module converts the PLC signals sent from the charging pile into SPI signals and the CAN signals from the vehicle into PLC signals.

[0103] The third MCU module obtains vehicle-side information through the second MCU module and charging pile-side information through the PLC MCU module. It processes and transmits these signals to complete the charging information interaction between the charging pile and the vehicle. The PLC signal is converted into an SPI signal and then sent to the second MCU module via the third MCU module.

[0104] Once the vehicle meets the DC charging conditions, the second MCU module closes the charging ready switch S2.

[0105] After detecting the charging ready signal, the European standard DC charging pile releases high-voltage DC power.

[0106] After receiving the request signal from the vehicle to close the DC charging relay, the second MCU module closes the DC charging relay K to realize DC charging.

[0107] In one embodiment, when the second MCU module detects that the duty cycle of the CP signal is a preset duty cycle, which is 5% in this embodiment, it is determined that a DC charging gun has been inserted.

[0108] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process may be rearranged without departing from the scope of this disclosure. The appended method claims provide elements of various steps in an exemplary order and are not intended to limit the scope to the specific order or hierarchy described.

[0109] In the above detailed description, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features of the single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, wherein each claim stands alone as a preferred embodiment of the invention.

[0110] The disclosed embodiments have been described above to enable any person skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in this application.

[0111] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as it is used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

[0112] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A European standard AC / DC charging integrated system, characterized in that: It includes an OBC module, a DC-DC module, and a communication protocol conversion module. The OBC module contains a first MCU module, the DC-DC module contains a second MCU module, and the communication protocol conversion module contains a PLC MCU module and a third MCU module. The first MCU module is used to implement digital control of the OBC module, including communicating with the second MCU module during AC charging and driving the internal power devices of the OBC module to achieve AC / DC conversion; The second MCU module is used to implement the logic control and DC-DC control of the OBC module, including detecting the AC charging gun signal and sending a charging command to the first MCU module during AC charging, and driving the internal power devices of the DC-DC module to realize DC / DC conversion, or communicating with the third MCU module during DC charging and driving the internal power devices of the DC-DC module to realize DC charging and DC / DC conversion; The third MCU module is used to communicate with the PLC MCU module and the second MCU module to process and transmit European standard DC charging information; The PLC MCU module is used to convert PLC signals into SPI signals and communicate with the third MCU module.

2. The European standard AC / DC charging integrated system according to claim 1, characterized in that: The communication between the OBC module and the DC-DC module is achieved through the first MCU module and the second MCU module, which communicate with each other via an internal CAN network.

3. The European standard AC / DC charging integrated system according to claim 1, characterized in that: The PLC MCU module communicates with the European standard DC charging pile through a 1:1:1 isolation transformer.

4. The European standard AC / DC charging integrated system according to claim 1, characterized in that: The PLC MCU module and the third MCU module are connected via an SPI interface, as are the third MCU module and the second MCU module.

5. An AC charging control method for a European standard AC / DC integrated charging system as described in any one of claims 1 to 4, characterized in that, The AC charging control method includes: After the second MCU module recognizes the AC charging gun signal, it feeds back the charging gun status and CP status to the vehicle network. After receiving the vehicle charging request, the second MCU module closes the charging ready switch S2 and sends a charging command to the first MCU module. The charging pile detects that the CP voltage amplitude is a specified value and outputs high-voltage AC power. After receiving the charging command sent by the second MCU module, the first MCU module performs pre-charging and self-test; After the pre-charge and self-test are completed, the first MCU module drives the power devices inside the OBC module to work, so that the OBC module outputs DC high voltage according to the voltage and current values ​​given by the second MCU module; The second MCU module controls the power devices inside the DCDC module to convert the high-voltage DC output from the OBC module into a low-voltage DC output. When the second MCU module detects that the charging gun has been disconnected or receives a stop charging command from the vehicle, the second MCU module sends a stop charging command to the first MCU module.

6. The AC charging control method as described in claim 5, characterized in that, Also includes: When the first MCU module drives the power devices inside the OBC module to work, the first MCU module sends the detected voltage and current information to the second MCU module, and the second MCU module sends the received voltage and current information to the vehicle network. When the first MCU module controls the power devices inside the OBC module to stop working, the first MCU module feeds back the working status to the second MCU module. The second MCU module sends the operating status to the vehicle network.

7. A DC / DC conversion control method for a European standard AC / DC charging integrated system as described in any one of claims 1 to 4, characterized in that, The DC / DC conversion control method includes: After receiving the working command from the vehicle, the second MCU module detects and judges the voltage at the input and output terminals, and performs a self-test. After the second MCU module determines that the working conditions are met, it controls the power devices inside the DC-DC module to work and output low-voltage DC power to the outside.

8. The DC / DC conversion control method as described in claim 7, characterized in that, Also includes: The second MCU module monitors the voltage and current on the high and low voltage sides; When the second MCU module detects a fault that causes the DCDC module to malfunction, it controls the power devices inside the DCDC module to stop working and outputs an alarm signal to the vehicle network. When the second MCU module receives a stop command from the DCDC module, it controls the power devices inside the DCDC module to stop working and reports its own working status to the vehicle network.

9. A DC charging control method for a European standard AC / DC integrated charging system as described in any one of claims 1 to 4, characterized in that, The DC charging control method includes: After the second MCU module detects the DC charging gun insertion signal, it locks the charging gun. The PLC MCU module converts the PLC signals sent from the charging pile into SPI signals and the CAN signals from the vehicle into PLC signals. The third MCU module obtains vehicle-side information through the second MCU module and charging pile-side information through the PLC MCU module. It processes and transmits these signals to complete the charging information interaction between the charging pile and the vehicle. The PLC signal is converted into an SPI signal and then sent to the second MCU module via the third MCU module. Once the vehicle meets the DC charging conditions, the second MCU module closes the charging ready switch S2. After detecting the charging ready signal, the European standard DC charging pile releases high-voltage DC power. After receiving the request signal from the vehicle to close the DC charging relay, the second MCU module closes the DC charging relay to realize DC charging.

10. The DC charging control method as described in claim 9, characterized in that: When the second MCU module detects that the duty cycle of the CP signal is the preset duty cycle, it determines that the DC charging gun has been inserted.

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