Charging pile identification circuit and method, charging control guide circuit and vehicle-mounted charger

Abstract

The application belongs to the technical field of electric vehicle charging control, and particularly relates to a charging pile identification circuit and method, a charging control guide circuit and a vehicle-mounted charger. The charging pile identification circuit comprises an auxiliary power supply, a detection module, a first end connected with a CC2 terminal on a charging socket, a second end connected with a positive electrode of the auxiliary power supply, a negative electrode of the auxiliary power supply grounded, and a closed loop formed between the auxiliary power supply and the detection module after a charging gun is connected with the charging socket, a switch module connected in series on the closed loop and used for controlling the state of the closed loop, a voltage division module connected on the first end or the second end of the detection module, and a control module used for controlling the switch module to be closed or opened after the charging gun is connected with the charging socket, diagnosing the switch module according to the voltage signals collected from the first end and the second end of the detection module, and identifying the type of the connected charging pile.

Description

Technical Field

[0001] This invention belongs to the field of electric vehicle charging control technology, specifically relating to a charging pile identification circuit and method, a charging control guidance circuit, and an on-board charger. Background Technology

[0002] Charging stations convert AC energy from the power grid into DC energy to charge the battery of an electric vehicle. However, before normal charging, it is necessary to confirm the connection between the electric vehicle (EV) and the charging station (EVSE) and identify the type of charging station. Specifically, this is achieved through CC1 and CC2 signals. The CC1 signal detects the connection status between the charging gun of the charging station and the charging socket of the vehicle; the CC2 signal identifies the type of charging station connected to the vehicle. For example, it may be a GB / T (China's national standard for electric vehicle charging recommendations) DC charging station, a CHAdeMO (Japan's international standard for electric vehicle charging) charging station, or a supercharger.

[0003] In practical applications, DC charging can range from power up to 150kW to super-fast charging of 350kW and above. Therefore, users can choose either a standard fast charging station or a super-fast charging station. This necessitates identifying the charging station type before charging to ensure proper operation. Incorrect charging station type identification can lead to errors in the entire charging logic, preventing normal charging, causing customer complaints, and incurring additional troubleshooting and repair costs.

[0004] like Figure 1 The control guidance circuit shown is compatible with DC charging in China and Japan, and currently only determines the CC2 status based on the sampling voltage of DP3. However, the voltage ranges of GB / T DC charging piles, CHAdeMO charging piles, and supercharging piles overlap. When DP3 falls within this overlapping voltage range, it may lead to incorrect identification of the charging pile type. Furthermore, the circuit does not include diagnostics for the Sv switch, and sometimes a fault in the Sv switch can also affect the vehicle's charging process. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a charging pile identification circuit that can eliminate the problem of Sv switch failure based on the voltage signal in the circuit. At the same time, it also avoids the problem of overlapping identification voltage ranges between different charging piles, effectively improving the accuracy and reliability of charging pile identification.

[0006] To achieve the above and other related objectives, the present invention provides a charging pile identification circuit, comprising: an auxiliary power supply; a detection module, the first end of which is connected to the CC2 terminal on the vehicle's charging socket, and the second end of which is connected to the positive terminal of the auxiliary power supply; the negative terminal of the auxiliary power supply is grounded, and a closed loop is formed between the auxiliary power supply and the detection module after the charging gun of the charging pile is connected to the vehicle's charging socket; a switch module, connected in series in the closed loop, for controlling the state of the closed loop; a voltage divider module, connected to the first or second terminal of the detection module, for dividing the voltage of the detection module; and a control module, for controlling the switch module to close or open after the charging gun of the charging pile is connected to the vehicle's charging socket, and for diagnosing the switch module based on the collected voltage signals from the first and second terminals of the detection module, and for identifying the type of the connected charging pile.

[0007] According to a specific embodiment of the present invention, the control module identifies the type of charging pile by comparing the ratio of the voltage signals from the first and second terminals of the detection module with the voltage ratio coefficient corresponding to each charging pile; wherein the voltage ratio coefficient is calculated based on the rated parameters of the auxiliary power supply, the detection module, the voltage divider module, and the resistor configured in the charging pile.

[0008] According to a specific embodiment of the present invention, after the control module controls the switch module to close, if the absolute value of the difference between the voltage signals at the first terminal and the second terminal of the detection module is less than or equal to a preset first threshold, the control module diagnoses a fault in the switch module; and / or after the control module controls the switch module to open, if the absolute value of the difference between the voltage signals at the first terminal and the second terminal of the detection module is greater than or equal to a preset second threshold, the control module diagnoses a fault in the switch module.

[0009] According to a specific embodiment of the present invention, one end of the switch module is connected to the second end of the detection module, and the other end is connected to the positive terminal of the auxiliary power supply.

[0010] According to a specific embodiment of the present invention, one end of the voltage divider module is connected to the second end of the detection module and one end of the switch module, respectively, and the other end is grounded.

[0011] According to a specific embodiment of the present invention, both the detection module and the voltage divider module are composed of one or more resistors connected in series and parallel.

[0012] A charging control and guidance circuit, characterized in that it includes the charging pile identification circuit described above, and a charging gun detection circuit.

[0013] An on-board charger includes the control and guidance circuit described above.

[0014] A charging pile identification method includes: a control module controlling a switch module to close or open, and diagnosing the switch module by collecting voltage signals from a first terminal and a second terminal of a detection module; if the switch module is diagnosed as faulty, the control module terminates the identification; otherwise, the control module identifies the type of charging pile based on the voltage signals from the first terminal and the second terminal of the detection module after the switch module is closed.

[0015] According to a specific embodiment of the present invention, the step of the control module controlling the switch module to close or open, and diagnosing the switch module by acquiring voltage signals from the first and second terminals of the detection module includes: after the control module controls the switch module to close, if the absolute value of the difference between the voltage signals from the first and second terminals of the detection module is less than or equal to a preset first threshold, then the control module diagnoses a fault in the switch module.

[0016] According to a specific embodiment of the present invention, the step of the control module controlling the switch module to close or open, and diagnosing the switch module by acquiring voltage signals from the first and second terminals of the detection module includes: after the control module controls the switch module to open, if the absolute value of the difference between the voltage signals from the first and second terminals of the detection module is greater than or equal to a preset second threshold, then the control module diagnoses that the switch module has malfunctioned.

[0017] According to a specific embodiment of the present invention, the step of the control module identifying the type of charging pile based on the voltage signals of the first and second terminals of the detection module after the switch module is closed includes: the control module controlling the switch module to close and acquiring the voltage signals of the first and second terminals of the detection module; the control module comparing the ratio of the voltage signals of the first and second terminals of the detection module with the voltage ratio coefficient corresponding to each charging pile to identify the type of charging pile; wherein, the voltage ratio coefficient is calculated based on the rated parameters of the auxiliary power supply, the detection module, the voltage divider module, and the resistor configured in the charging pile.

[0018] The charging pile identification circuit provided by this invention can diagnose whether the Sv switch is malfunctioning by detecting voltage signals in the circuit, with only a small increase in hardware cost and in conjunction with a simple control strategy, thereby avoiding any impact on vehicle charging. Simultaneously, by analyzing the voltage ratio in the circuit, the type of charging pile connected to the vehicle can be accurately identified to adapt the corresponding charging control logic, greatly improving the reliability and stability of vehicle charging. Attached Figure Description

[0019] Figure 1 Circuit topology diagram of control guide circuit for DC charging compatible with existing technologies in China and Japan;

[0020] Figure 2 This is a circuit topology diagram of a specific embodiment of a charging pile identification circuit provided by the present invention;

[0021] Figure 3 This is a circuit topology diagram of a specific embodiment of a charging control guidance circuit provided by the present invention;

[0022] Figure 4 This is a flowchart illustrating a specific embodiment of a charging pile identification method provided by the present invention. Detailed Implementation

[0023] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0025] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0026] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0027] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0028] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0029] First, it should be noted that, in order to enable those skilled in the art to better understand the present application, a simple description of the prior art is provided.

[0030] An on-board charger (OBC) is a charger that is fixedly installed on an electric vehicle. It has the ability to safely, quickly and conveniently fully charge the power battery. Based on the data provided by the battery management system (BMS), it dynamically adjusts the charging current and voltage parameters, executes the corresponding charging actions, and completes the charging process.

[0031] Before normal charging, the OBC needs to verify the connection between the electric vehicle and the charging station and identify the type of charging station. This is achieved through the charging control guidance circuitry within the OBC. Figure 1 As shown, the CC1 detection circuit is used to detect the connection status between the charging gun of the charging station and the charging socket of the vehicle, i.e., the plug-in detection circuit. CC2 is used to identify the type of charging station the vehicle is connected to, i.e., the charging station identification circuit.

[0032] Currently, charging pile type identification primarily relies on DP3 to determine whether it's a GB / T DC charging pile, a CHAdeMO charging pile, or a supercharger. The 12V voltage provided by the auxiliary power supply inside a normal OBC typically fluctuates between 9 and 16V. Therefore, each of the three types of charging piles corresponds to a specific voltage range. Specifically, the voltage range for GB / T DC charging piles is 6-10.6V, for CHAdeMO charging piles it's 4.58-5.54V, and for superchargers it's 4.5-8V. When the collected DP3 value falls within any of these voltage ranges, it's identified as the corresponding charging pile. However, the voltage ranges for the three types of charging piles overlap. When the collected DP3 value falls within this overlapping voltage range, misjudgment can occur, leading to errors in the entire charging logic.

[0033] Therefore, the charging pile identification circuit proposed in this application can improve the accuracy of charging pile type identification and avoid misjudgment. At the same time, it can further eliminate the problem of Sv switch failure.

[0034] Example 1

[0035] Please see Figure 2 As shown, a charging pile identification circuit includes: an auxiliary power supply 10, used to provide the current and voltage required for CC2 signal detection; and a detection module 20, with its first end connected to the CC2 terminal on the vehicle's charging socket and its second end connected to the positive terminal of the auxiliary power supply 10, used to convert the current signal output by the auxiliary power supply 10 into a voltage signal, so that the corresponding voltage signal can be collected for fault diagnosis of the Sv switch and identification of the type of charging pile. The negative terminal of the auxiliary power supply 10 is grounded, and a closed loop is formed between the auxiliary power supply 10 and the detection module 20 only when the charging gun of the charging pile is connected to the vehicle's charging socket.

[0036] The charging pile identification circuit further includes a switch module 30, which is the Sv switch of the charging control guidance circuit in the OBC, connected in series in the closed loop formed by the auxiliary power supply 10 and the detection module 20, and used to control the state of the closed loop, that is, to control the closed loop to be on or off. In a specific embodiment, one end of the switch module 30 is connected to the second end of the detection module 20, and the other end is connected to the positive terminal of the auxiliary power supply 10.

[0037] It's important to note that the operating state of the Sv switch varies depending on the standards and requirements of different charging stations. Typically, the Sv switch remains open until the charging gun and the vehicle's charging socket are connected. It only closes when the type of charging station needs to be identified for the subsequent charging process, thus establishing a closed loop between the auxiliary power supply 10 and the detection module 20. However, the closing time of the Sv switch may be adjusted according to different charging station standards and requirements. For example, the Sv switch may remain closed throughout the vehicle's charging process, or it may open after a certain period following its closure.

[0038] Therefore, whether the switch module 30 malfunctions will affect whether the vehicle can charge normally. Specifically, in practical applications, the switch module 30, i.e., the Sv switch, can use electronic devices such as switching transistors and relays to close or open in response to electrical signals. However, when it experiences an adhesion failure, it cannot correctly respond to electrical signals to close or open, and remains in the previous state.

[0039] For example, such as Figure 1As shown, the Sv switch is currently in the open state. When it needs to close and receives the corresponding electrical signal, it fails to close properly due to adhesion and remains in the open state, with the sampled DP3 voltage at 0V. Therefore, the control chip inside the OBC cannot determine whether the charging gun and charging socket are not properly connected or whether the Sv switch is malfunctioning. Simultaneously, due to the Sv switch malfunction, the closed loop between the auxiliary power supply 10 and the detection module 20 cannot be completed, making it impossible to identify the type of charging station and thus preventing vehicle charging. However, the vehicle's control terminal receives no notification, leading to customer complaints and grievances.

[0040] It should be noted that the auxiliary power supply 10 and the detection module 20 will only form a closed loop when the charging gun of the charging station and the charging socket of the vehicle are properly connected. In practical applications, the OBC can check the connection status between the charging gun and the charging socket by detecting the CC1 signal, whether it is properly connected, or whether it is not properly connected.

[0041] Therefore, in this embodiment, as Figure 2 As shown, the charging pile identification circuit further includes a voltage divider module 40, one end of which is connected to the second end of the detection module 20 and one end of the switch module 30, and the other end is grounded, thereby dividing the voltage of the detection module 20.

[0042] It should be noted that the connection positions of the switch module 30 and the voltage divider module 40 are not limited to those provided in this embodiment. For example, the switch module 30 can be connected in series between the first end of the detection module 20 and the CC2 terminal, and the voltage divider module 40 can also be connected to the first end of the detection module 20. Modifications and refinements made by those skilled in the art to the embodiments of the present invention without departing from the spirit of the present invention still fall within the scope of the invention application patent of the present invention.

[0043] The control module (not shown in the figure) can be a control chip inside the OBC or an additional control unit. It is used to control the switch module 30 to close or open, and to collect voltage signals on the first and second terminals of the detection module 20 to diagnose whether the switch module 30 has malfunctioned and to identify the type of charging pile.

[0044] Specifically, in practical applications, when the charging gun of the charging pile is connected to the charging socket of the vehicle, the control module controls the switch module 30 to close, that is, sends an electrical signal to the switch module 30 for its closure, and collects the voltage signal DP3 at the first end and the voltage signal DP4 at the second end of the detection module 20, and identifies the type of charging pile based on DP3 and DP4.

[0045] However, to avoid the switch module 30 affecting vehicle charging, the control module can first control the switch module to attempt to close or open before starting to identify the charging station, in order to detect whether the switch module has malfunctioned.

[0046] For example, when the charging gun of the charging pile is connected to the charging socket of the vehicle, the initial state of the switch module 30 is open. Correspondingly, the control module controls the switch module to close, thereby establishing a closed circuit between the auxiliary power supply 10 and the detection module 20. If, under the premise that the switch module 30 is closed, the absolute value of the voltage difference between DP3 and DP4 is greater than a preset first threshold, it indicates that the switch module 30 is normal, and the control module diagnoses that the switch module 30 has been successfully closed, allowing continued identification of the charging pile type; otherwise, it diagnoses a bonding fault in the switch module 30 and terminates the identification of the charging pile, alerting the user via the vehicle terminal that the vehicle may not be charging normally.

[0047] Alternatively, to further confirm the switch module 30, the control module can first close the switch module 30 and then open it. If, under the premise that the switch module 30 is open, the absolute value of the voltage difference between DP3 and DP4 is less than a preset second threshold, it indicates that the switch module 30 is normal, the control module diagnoses that the switch module 30 has been successfully opened, and the control module can continue to close the switch module 30 to identify the charging pile; otherwise, it diagnoses that the switch module 30 has an adhesion fault and promptly alerts the user via the vehicle terminal.

[0048] If the switch module 30 does not malfunction and is successfully closed, the control module can identify the charging pile type based on the collected DP3 and DP4 data.

[0049] Because different charging piles have different resistor configurations, and a voltage divider module 40 is added to the charging pile identification circuit, the ratio between DP4 and DP3 will exhibit different proportions when the charging pile identification circuit is connected to different charging piles. Specifically, based on the voltage output of the auxiliary power supply 10, the resistance values ​​of the detection module 20 and the voltage divider module 40, and the resistance value of the resistor configured in the charging pile, the voltage ratio coefficients of DP4 and DP3 can be calculated accordingly, obtaining the first voltage ratio coefficient, the second voltage ratio coefficient, and the third voltage ratio coefficient corresponding to GB / T DC charging piles, CHAdeMO piles, and supercharging piles, respectively. The ratio of DP4 to DP3 is then compared with the first voltage ratio coefficient, the second voltage ratio coefficient, and the third voltage ratio coefficient, respectively: if the ratio of DP4 to DP3 conforms to any voltage ratio coefficient, it is identified as the charging pile type corresponding to the voltage ratio coefficient.

[0050] Therefore, identifying charging pile types by voltage ratio effectively avoids the problem of overlapping voltage ranges of charging piles, and improves the accuracy and reliability of charging pile identification.

[0051] Furthermore, due to the different standards and requirements of charging piles, the switch module 30 needs to be disconnected within a certain period of time. Accordingly, the control module controls the switch module 30 to disconnect, that is, it sends an electrical signal to the switch module 30 to disconnect it. Simultaneously, the control module can re-acquire the voltage signal DP3 at the first terminal and the voltage signal DP4 at the second terminal of the detection module 20 to re-detect whether the switch module 30 has malfunctioned, thus avoiding any impact on the vehicle's next charging attempt and improving the reliability and stability of the circuit.

[0052] It should be noted that in this embodiment, only GB / T DC charging piles, CHAdeMO charging piles, and supercharging piles are provided for reference, and the invention is not limited to recognizing only the aforementioned charging piles. By calculating the corresponding voltage ratio coefficients and making comparisons, any type of DC charging pile can be identified. Modifications and refinements made by those skilled in the art to the embodiments of this invention without departing from the spirit of this invention still fall within the scope of the invention application patent.

[0053] In one specific embodiment, both the detection module 20 and the voltage divider module 30 can be constructed from one or more resistors connected in series and parallel, without limitation, and can be adjusted according to actual conditions. Similarly, the voltage and current provided by the auxiliary power supply can also be adjusted according to actual conditions and requirements. Modifications and refinements made by those skilled in the art to the embodiments of the present invention without departing from the spirit of the present invention still fall within the scope of the invention application.

[0054] In summary, the charging pile identification circuit provided in this embodiment adds only a small amount of hardware cost and, combined with a simple control strategy, can accurately identify the type of charging pile, greatly improving the robustness of the charging identification circuit and the reliability of vehicle charging.

[0055] Example 2

[0056] Please see Figure 3 As shown, this embodiment also provides a charging control guidance circuit, including the charging pile identification circuit described in Embodiment 1, and the plug-in detection circuit.

[0057] Furthermore, there are no restrictions on the insertion detection circuit, i.e., the CC1 detection circuit, in this embodiment; any detection circuit can be used.

[0058] Example 3

[0059] This embodiment also provides an on-board charger (OBC), including the charging control guide circuit described in embodiment 2.

[0060] Example 4

[0061] Please see Figure 4As shown, this embodiment also provides a charging pile identification method, including:

[0062] Step S100: The control module controls the switch module to close or open, and diagnoses the switch module by acquiring the voltage signals from the first and second terminals of the detection module.

[0063] If a fault is diagnosed in the switch module, the control module will terminate the identification process.

[0064] Otherwise, the control module identifies the type of charging pile based on the voltage signals from the first and second terminals of the detection module after the switch module is closed.

[0065] The control module controls the switch module to close, collects the voltage signals from the first and second terminals of the detection module, and compares the ratio of the voltage signals from the first and second terminals of the detection module with the voltage ratio coefficient corresponding to each charging pile to identify the type of charging pile. The voltage ratio coefficient is calculated based on the rated parameters of the auxiliary power supply, the detection module, the voltage divider module, and the resistors configured in the charging pile.

[0066] The steps involved in the control module controlling the switch module to close or open, and diagnosing the switch module by acquiring voltage signals from the first and second terminals of the detection module, include:

[0067] After the control module closes the switch module, if the absolute value of the difference between the voltage signals at the first and second terminals of the detection module is less than or equal to a preset first threshold, the control module will diagnose a fault in the switch module.

[0068] Alternatively, if the absolute value of the difference between the voltage signals at the first and second terminals of the detection module is greater than or equal to a preset second threshold after the control module controls the switch module to disconnect, the control module will diagnose a fault in the switch module.

[0069] In summary, the charging pile identification circuit provided by this invention can diagnose whether the Sv switch is malfunctioning by detecting voltage signals in the circuit, with only a small increase in hardware cost and in conjunction with a simple control strategy, thereby avoiding any impact on vehicle charging. Simultaneously, the voltage ratio in the circuit can accurately identify the type of charging pile connected to the vehicle, adapting the corresponding charging control logic and greatly improving the reliability and stability of vehicle charging.

[0070] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

[0071] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0072] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A charging pile identification circuit, characterized in that, include: Auxiliary power supply The detection module has its first end connected to the CC2 terminal on the vehicle's charging socket, and its second end connected to the positive terminal of the auxiliary power supply. The negative terminal of the auxiliary power supply is grounded, and a closed loop is formed between the auxiliary power supply and the detection module after the charging gun of the charging pile is connected to the charging socket of the vehicle. A switch module, connected in series in the closed loop, is used to control the state of the closed loop; A voltage divider module is connected to the first or second end of the detection module and is used to divide the voltage of the detection module. The control module is used to control the switch module to close or open after the charging gun of the charging pile is connected to the charging socket of the vehicle, and to diagnose the switch module based on the voltage signals of the first and second terminals of the detection module, and to identify the type of the connected charging pile.

2. The charging pile identification circuit according to claim 1, characterized in that, The control module identifies the type of charging pile by comparing the ratio of the voltage signals from the first and second terminals of the detection module with the voltage ratio coefficient corresponding to each charging pile. The voltage proportionality coefficient is calculated based on the rated parameters of the auxiliary power supply, the detection module, the voltage divider module, and the resistors configured in the charging pile.

3. The charging pile identification circuit according to claim 1, characterized in that, After the control module controls the switch module to close, if the absolute value of the difference between the voltage signals at the first and second terminals of the detection module is less than or equal to a preset first threshold, the control module diagnoses a fault in the switch module. And / or after the control module controls the switch module to disconnect, if the absolute value of the difference between the voltage signals at the first and second terminals of the detection module is greater than or equal to a preset second threshold, the control module diagnoses a fault in the switch module.

4. The charging pile identification circuit according to claim 1, characterized in that, One end of the switch module is connected to the second end of the detection module, and the other end is connected to the positive terminal of the auxiliary power supply.

5. The charging pile identification circuit according to claim 4, characterized in that, One end of the voltage divider module is connected to the second end of the detection module and one end of the switch module, while the other end is grounded.

6. The charging pile identification circuit according to claim 1, characterized in that, Both the detection module and the voltage divider module consist of one or more resistors connected in series and parallel.

7. A charging control guide circuit, characterized in that, It includes the charging pile identification circuit as described in any one of claims 1 to 6, and the plug-in detection circuit.

8. An on-board charger, characterized in that, Includes the control guidance circuit described in claim 7.

9. A method for identifying charging piles, characterized in that, The method, applied to the charging pile identification circuit according to any one of claims 1 to 6, comprises: The control module controls the switch module to close or open, and diagnoses the switch module by acquiring the voltage signals from the first and second terminals of the detection module. If a fault is diagnosed in the switch module, the control module terminates the identification process. Otherwise, the control module identifies the type of charging pile based on the voltage signals from the first and second terminals of the detection module after the switch module is closed.

10. The charging pile identification method according to claim 9, characterized in that, The steps of controlling the switch module to close or open, and diagnosing the switch module by acquiring voltage signals from the first and second terminals of the detection module, include: After the control module controls the switch module to close, if the absolute value of the difference between the voltage signals at the first and second terminals of the detection module is less than or equal to a preset first threshold, the control module diagnoses a fault in the switch module.

11. The charging pile identification method according to claim 9, characterized in that, The steps of controlling the switch module to close or open, and diagnosing the switch module by acquiring voltage signals from the first and second terminals of the detection module, include: After the control module controls the switch module to disconnect, if the absolute value of the difference between the voltage signals at the first and second terminals of the detection module is greater than or equal to a preset second threshold, the control module diagnoses a fault in the switch module.

12. The charging pile identification method according to claim 9, characterized in that, Otherwise, the step of the control module identifying the type of charging pile based on the voltage signals of the first and second terminals of the detection module after the switch module is closed includes: The control module controls the switch module to close and collects the voltage signals from the first and second terminals of the detection module. The control module compares the ratio of the voltage signals at the first and second terminals of the detection module with the voltage ratio coefficient corresponding to each charging pile to identify the type of charging pile. The voltage proportionality coefficient is calculated based on the rated parameters of the auxiliary power supply, detection module, voltage divider module, and resistors configured in the charging pile.

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