A regulating device for a direct current charging interface

Abstract

The application provides an adjusting device of a direct current charging interface, and relates to the technical field of direct current charging test. In the adjusting device, a direct current charging gun input end is connected to a direct current charging gun output end through a high-voltage direct current end switch panel, the direct current charging gun input end is connected to a direct current charging pile to be tested, and the direct current charging gun output end is connected to an electric vehicle to be tested. A contact switch is matched with a switch area panel, and the contact switch is connected to the direct current charging gun input end and the direct current charging gun output end. A voltage converter is connected to a power supply end of a bus data recorder, and a data end of the bus data recorder is connected to the contact switch and the direct current charging gun input end. The adjusting device can improve the convenience and universality of direct current charging interoperability test.

Description

Technical Field

[0001] This application relates to the field of DC charging testing technology, and more specifically, to an adjustment device for a DC charging interface. Background Technology

[0002] With the rapid development of electric vehicles, the safety and compatibility issues of DC charging for electric vehicles are becoming increasingly prominent. Currently, the poor compatibility between different vehicle models and charging devices has brought many inconveniences and safety problems to users, which not only affects the user's charging experience but also directly impacts the promotion and application of electric vehicles. In existing technologies, DC charging interoperability testing devices for different vehicle models and charging devices are complex to operate and have poor universality. Utility Model Content

[0003] The purpose of this application is to provide an adjustment device for a DC charging interface, which can improve the convenience and versatility of DC charging interoperability testing.

[0004] This application provides an adjustment device for a DC charging interface, comprising: The high-voltage component includes a DC charging gun input terminal, a DC charging gun output terminal, and a high-voltage DC terminal switch panel. The DC charging gun input terminal is connected to the DC charging gun output terminal through the high-voltage DC terminal switch panel. The DC charging gun input terminal is connected to the DC charging pile to be tested, and the DC charging gun output terminal is connected to the electric vehicle to be tested. The low-voltage component includes a contact switch and a switch area panel, wherein the contact switch is matched with the switch area panel, and the contact switch is respectively connected to the input terminal of the DC charging gun and the output terminal of the DC charging gun; The signal acquisition component includes a voltage converter and a bus data logger. The voltage converter is connected to the power supply terminal of the bus data logger, and the data terminal of the bus data logger is connected to the contact switch and the input terminal of the DC charging gun, respectively.

[0005] In the above implementation process, the DC charging gun input and output terminals in the high-voltage component are connected to the DC charging pile and the electric vehicle under test, respectively. Various simulation tests can be performed through the high-voltage DC end switch panel and contact switches, such as simulating fault scenarios like undervoltage charging at the vehicle end, communication interruption, poor connection, and half-connection state. The test data is recorded by the bus data recorder in the signal acquisition component. The high-voltage DC end switch panel and switch area panel distinguish between high-voltage and low-voltage areas, reducing operational hazards. The adjustment device of this DC charging interface can be applied to DC charging interoperability testing between different types of electric vehicles and DC charging piles. The testing is convenient and highly versatile, which can improve the convenience and versatility of DC charging interoperability testing.

[0006] Furthermore, the high-voltage component also includes a high-voltage DC input terminal harness and a high-voltage DC output terminal harness. The input terminal of the DC charging gun is connected to the high-voltage DC terminal switch panel through the high-voltage DC input terminal harness, and the high-voltage DC terminal switch panel is connected to the output terminal of the DC charging gun through the high-voltage DC output terminal harness.

[0007] In the above implementation process, the high-voltage component is equipped with independent high-voltage wiring harnesses: a high-voltage DC input terminal wiring harness and a high-voltage DC output terminal wiring harness. The connection between the DC charging gun input terminal, the DC charging gun output terminal and the high-voltage DC terminal switch panel is realized through the high-voltage DC input terminal wiring harness and the high-voltage DC terminal wiring harness, ensuring efficient current transmission and durability.

[0008] Furthermore, the high-voltage component also includes a fuse mechanism, and the positive terminal wire in the high-voltage DC input terminal harness is connected to the high-voltage DC terminal switch panel through the fuse mechanism.

[0009] In the above implementation process, the fuse mechanism is connected in series between the positive terminal DC+ of the high-voltage DC input harness and the high-voltage DC switch panel to ensure disconnection protection in case of a short circuit, thereby improving safety.

[0010] Furthermore, the high-voltage component also includes an adjustable resistor at the negative terminal of the high-voltage DC circuit, and the negative terminal of the high-voltage DC input harness is connected to the high-voltage DC switch panel through the adjustable resistor at the negative terminal of the high-voltage DC circuit.

[0011] In the above implementation process, the adjustable resistor at the negative terminal of the high-voltage DC is connected in series between the negative terminal DC- in the high-voltage DC input harness and the high-voltage DC terminal switch panel to simulate a short-circuit fault in the high-voltage DC circuit. This can verify the vehicle's high-voltage insulation detection capability and the vehicle's control strategy under relevant insulation failure scenarios.

[0012] Furthermore, the high-voltage component also includes a grounding switch, which is connected to the high-voltage DC input terminal harness.

[0013] In the above implementation process, the negative terminal DC- of the high voltage DC input harness is grounded through a grounding switch; this grounding switch can be used when the tester needs to simulate poor insulation of the high voltage circuit, by first turning on the grounding switch and then adjusting the adjustable resistor at the negative terminal of the high voltage DC to realize the scenario test of poor insulation of the high voltage system.

[0014] Furthermore, the contact switch also includes a low-voltage positive terminal switch and a low-voltage negative terminal switch, and the input terminal of the DC charging gun is connected to the output terminal of the DC charging gun through the low-voltage positive terminal switch and the low-voltage negative terminal switch.

[0015] In the above implementation process, the input terminal of the DC charging gun can output low-voltage power to the output terminal of the DC charging gun through the low-voltage positive terminal switch and the low-voltage negative terminal switch; wherein, the low-voltage positive terminal switch is connected to the positive terminal and the low-voltage negative terminal switch is connected to the negative terminal.

[0016] Furthermore, the low-voltage component also includes a low-voltage positive terminal contact switch and a low-voltage positive terminal power button switch. The low-voltage positive terminal sub-switch is connected to the input terminal of the DC charging gun through the low-voltage positive terminal contact switch. One end of the low-voltage positive terminal power button switch is connected to the voltage converter, and the other end of the low-voltage positive terminal power button switch is connected between the low-voltage positive terminal sub-switch and the low-voltage positive terminal contact switch.

[0017] In the above implementation process, the low-voltage positive terminal power button switch is connected to the voltage converter and can be responsible for closing or opening the low-voltage power at the A+ terminal output of the voltage converter; the low-voltage positive terminal contact switch is responsible for closing or opening the A+ power input from the DC charging pile under test to the DC charging gun input terminal. When the tester needs to adjust the A+ voltage by himself using the voltage converter, he can disconnect the A+ power input from the DC charging pile under test in advance through the low-voltage positive terminal contact switch.

[0018] Furthermore, the contact switch also includes a first charging connection confirmation terminal switch, a second charging connection confirmation terminal switch, and a protective grounding terminal switch. The low-voltage component also includes multiple low-voltage adjustable resistors. The first charging connection confirmation terminal switch, the second charging connection confirmation terminal switch, and the protective grounding terminal switch are respectively connected to the DC charging gun input terminal through the corresponding low-voltage adjustable resistors.

[0019] In the above implementation process, the low-voltage adjustable resistor can adjust the resistance value of the connection lines of the first charging connection confirmation line terminal switch, the second charging connection confirmation line terminal switch, and the protective grounding line terminal switch, thereby simulating fault scenarios such as communication interruption, poor connection, and half-connection state.

[0020] Furthermore, the low-voltage component also includes a protective grounding terminal, which is connected between the protective grounding terminal switch and the DC charging gun input terminal.

[0021] In the above implementation process, the protective grounding wire and the protective grounding wire terminal switch at the input end of the DC charging gun are grounded through the protective grounding terminal to ensure stable and reliable DC charging signal interaction.

[0022] Furthermore, the signal acquisition component also includes a recorder button switch, and the power supply terminal of the bus data recorder is connected to the power supply terminal of the bus data recorder through the recorder button switch.

[0023] In the above implementation process, a recorder button switch is set to close or disconnect the low voltage output from the voltage converter to the bus data recorder.

[0024] Furthermore, the signal acquisition component also includes a fast-charging CAN bus bus interface and a fast-charging CAN bus public interface. The fast-charging CAN bus bus interface is connected to the communication connection port of the DC charging pile under test / the electric vehicle under test, and the fast-charging CAN bus public interface is connected to the fast-charging CAN bus bus interface and the bus data recorder, respectively.

[0025] In the above implementation process, the fast charging CAN bus bus interface is the communication connection port between the charging pile and the vehicle. The fast charging CAN bus public interface is used to connect to the fast charging CAN bus bus interface. After connection, the fast charging CAN bus data is collected or observed through the bus data recorder.

[0026] Furthermore, the signal acquisition component also includes a fast-charging CAN terminating resistor, which is connected between the DC charging gun input terminal and the contact switch.

[0027] In the above implementation process, by setting the fast charging CAN terminal resistor, testers can choose whether to add a terminal resistor according to the different vehicle models, effectively ensuring the stability of network communication.

[0028] Other features and advantages disclosed in this application will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the above-described technology disclosed in this application.

[0029] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A schematic diagram of the structure of the adjustment device for the DC charging interface provided in the embodiments of this application. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0033] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0034] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0035] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or a point connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0036] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0037] Generally, with the rapid development of electric vehicles, the safety and compatibility issues of DC charging for electric vehicles are becoming increasingly prominent. Currently, the poor compatibility between different vehicle models and different charging devices has brought many inconveniences and safety issues to users, which not only affects the user's charging experience but also directly impacts the promotion and application of electric vehicles. In existing technologies, DC charging interoperability testing devices between different vehicle models and different charging devices are complex to operate and have poor universality.

[0038] Therefore, it is essential to conduct research on DC charging interoperability testing and corresponding testing devices. Charging interoperability testing can verify whether the communication protocol and control logic between electric vehicles and charging equipment are reasonable and effective, which is of great significance for ensuring the compatibility and safety of vehicles and charging piles. This utility model mainly focuses on the research, development, and application of DC charging testing devices.

[0039] To address the aforementioned technical problems, this application provides an adjustment device for a DC charging interface. This device connects the DC charging gun input and output terminals in the high-voltage assembly to the DC charging pile and the electric vehicle under test, respectively. Various simulated tests can be performed via the high-voltage DC-side switch panel and contact switches, such as simulating vehicle-side charging voltage undervoltage, communication interruption, poor connection, and partial connection. Test data is recorded by a bus data logger in the signal acquisition assembly. Furthermore, the high-voltage DC-side switch panel and switch area panel distinguish between high-voltage and low-voltage areas, reducing operational risks. This DC charging interface adjustment device is applicable to DC charging interoperability testing between different types of electric vehicles and DC charging piles, offering convenient testing and high versatility, thus improving the convenience and universality of DC charging interoperability testing.

[0040] Please see Figure 1 , Figure 1 A schematic diagram of the structure of the adjustment device for the DC charging interface provided in this application embodiment; the adjustment device for the DC charging interface includes: The high-voltage component includes a DC charging gun input terminal 1, a DC charging gun output terminal 2, and a high-voltage DC terminal switch panel 8. The DC charging gun input terminal 1 is connected to the DC charging gun output terminal 2 through the high-voltage DC terminal switch panel 8, and the DC charging gun input terminal 1 is connected to the DC charging pile to be tested, while the DC charging gun output terminal 2 is connected to the electric vehicle to be tested. The low-voltage component includes a contact switch 10 and a switch area panel 11. The contact switch 10 and the switch area panel 11 are matched and configured. The contact switch 10 is connected to the DC charging gun input terminal 1 and the DC charging gun output terminal 2, respectively. The signal acquisition component includes a voltage converter 17 and a bus data logger 23. The voltage converter 17 is connected to the power supply terminal of the bus data logger 23, and the data terminals of the bus data logger 23 are connected to the contact switch 10 and the DC charging gun input terminal 1, respectively.

[0041] For example, the DC charging gun input terminal 1 is connected to the DC charging pile under test, the DC charging gun output terminal 2 is connected to the electric vehicle under test, and the DC charging gun input terminal 1 and DC charging gun output terminal 2 are connected through the high voltage DC terminal switch panel 8. Thus, by means of the above method, an adjustment device for the DC charging interface is connected between the DC charging pile to be tested and the electric vehicle to be tested, and various switches on the high-voltage DC end switch panel 8 are used to simulate fault scenarios such as undervoltage and disconnection of the vehicle-end charging voltage.

[0042] For example, the sockets of the DC charging gun input terminal 1 and the DC charging gun output terminal 2 are universal sockets that can be connected to different types of DC charging piles and electric vehicles, facilitating DC charging interoperability tests between different vehicle models and different charging equipment.

[0043] For example, the switch area panel 11 on the low-voltage component can physically distinguish and isolate the high-voltage / low-voltage areas from the high-voltage DC-side switch panel 8; wherein, the high-voltage DC-side switch panel 8 is used for high-voltage simulation operation, distinguishing it from the high-voltage area, where the risk of electric shock is higher; the switch area panel 11 is equipped with a low-voltage contact switch 10, used for the low-voltage area, where the risk of electric shock is lower; through the above method, the physical distinction and isolation of the high-voltage / low-voltage areas are ensured, thereby improving operational safety.

[0044] For example, the contact switch 10 is a low-voltage contact switch, which can be used to close and disconnect the DC charging conduction signal transmitted from the charging pile, simulate scenarios such as undervoltage, communication interruption, poor connection, and half-connection state, and verify the vehicle's control and handling of various faults.

[0045] For example, the voltage converter 17 can be connected to an external 220V power supply to power the bus data logger 23; the bus data logger 23 can record and collect fast charging CAN bus data between the DC charging pile under test and the electric vehicle under test, and can realize data collection as soon as it is powered on.

[0046] The DC charging interface adjustment device provided in this application embodiment is connected to the DC charging pile under test and the electric vehicle under test through the DC charging gun input terminal 1 and DC charging gun output terminal 2 in the high-voltage component, respectively. Various simulation tests can be performed through the high-voltage DC end switch panel 8 and contact switch 10, such as simulating fault scenarios such as undervoltage charging at the vehicle end, communication interruption, poor connection, and half-connection state. The test data is recorded by the bus data recorder 23 in the signal acquisition component. The high-voltage DC end switch panel 8 and switch area panel 11 distinguish the high-voltage area and the low-voltage area, reducing the operational danger. This DC charging interface adjustment device can be applied to DC charging interoperability testing between different types of electric vehicles and DC charging piles. The testing is convenient and highly versatile, which can achieve the technical effect of improving the convenience and versatility of DC charging interoperability testing.

[0047] In some embodiments, the high-voltage assembly further includes a high-voltage DC input harness 3 and a high-voltage DC output harness 4. The DC charging gun input terminal 1 is connected to the high-voltage DC switch panel 8 via the high-voltage DC input harness 3, and the high-voltage DC switch panel 8 is connected to the DC charging gun output terminal 2 via the high-voltage DC output harness 4.

[0048] For example, the high-voltage component is configured with independent high-voltage wiring harnesses: high-voltage DC input terminal wiring harness 3 and high-voltage DC output terminal wiring harness 4, and the connection between DC charging gun input terminal 1, DC charging gun output terminal 2 and high-voltage DC terminal switch panel 8 is realized through high-voltage DC input terminal wiring harness 3 and high-voltage DC output terminal wiring harness 4, so as to ensure efficient current transmission and durability.

[0049] For example, the high-voltage DC input harness 3 includes a positive terminal DC+ and a negative terminal DC-; similarly, the high-voltage DC output harness 4 includes a positive terminal DC+ and a negative terminal DC-.

[0050] In some embodiments, the high-voltage assembly also includes a fuse mechanism 5, through which the positive terminal wire in the high-voltage DC input terminal harness 3 is connected to the high-voltage DC terminal switch panel 8.

[0051] For example, the fuse mechanism 5 is connected in series between the positive terminal DC+ of the high-voltage DC input harness 3 and the high-voltage DC switch panel 8 to ensure disconnection protection in case of a short circuit, thereby improving safety.

[0052] Optionally, the fuse mechanism 5 can be a fuse resistor, fuse wire, or other structural form, which is only an example and not a limitation. The fuse mechanism 5 adopts a fuse wire and is connected in series between the positive terminal DC+ of the high voltage DC input harness 3 and the high voltage DC switch panel 8, or it can be represented as a high voltage DC+ terminal fuse.

[0053] In some embodiments, the high-voltage component also includes a high-voltage DC negative terminal adjustable resistor 6, and the negative terminal of the high-voltage DC input terminal harness 3 is connected to the high-voltage DC terminal switch panel 8 through the high-voltage DC negative terminal adjustable resistor 6.

[0054] For example, the adjustable resistor 6 at the negative terminal of the high-voltage DC circuit is connected in series between the negative terminal DC- in the high-voltage DC input harness 3 and the high-voltage DC terminal switch panel 8 to simulate a short-circuit fault in the high-voltage DC circuit. This can verify the vehicle's high-voltage insulation detection capability and the vehicle's control strategy under relevant insulation failure scenarios.

[0055] For example, the adjustable resistor at the negative terminal of a high-voltage DC circuit can be represented as an adjustable resistor at the DC- terminal of a high-voltage DC circuit.

[0056] Optionally, the high voltage DC negative terminal adjustable resistor 6 is an adjustable resistor with a voltage range of 500-1000V. To prevent electrical breakdown, a slender substrate with high withstand voltage can be selected, the resistive film is made into a spiral strip, and the voltage gradient along the length direction must not exceed 500V / cm.

[0057] In some embodiments, the high-voltage assembly also includes a grounding switch 7 connected to the high-voltage DC input harness 3.

[0058] For example, the negative terminal DC- of the high-voltage DC input harness 3 is grounded through the grounding switch 7; the grounding switch can be used to simulate poor insulation of the high-voltage circuit when the tester needs to turn on the grounding switch 7 and then adjust the adjustable resistor 6 at the negative terminal of the high-voltage DC to realize the scenario test of poor insulation of the high-voltage system.

[0059] Optionally, under normal non-test conditions, the grounding switch 7 is normally closed.

[0060] In some embodiments, the contact switch 10 further includes a low-voltage positive terminal switch and a low-voltage negative terminal switch, and the DC charging gun input terminal is connected to the DC charging gun output terminal through the low-voltage positive terminal switch and the low-voltage negative terminal switch.

[0061] For example, the input terminal of the DC charging gun can output low-voltage power to the output terminal of the DC charging gun through a low-voltage positive terminal switch and a low-voltage negative terminal switch; wherein, the low-voltage positive terminal switch is connected to the positive terminal A+ and the low-voltage negative terminal switch is connected to the negative terminal A-.

[0062] For example, the low-voltage positive terminal switch and the low-voltage negative terminal switch can be represented as A+ terminal switch and A- terminal switch, respectively.

[0063] In some embodiments, the low-voltage component further includes a low-voltage positive contact switch 15 and a low-voltage positive power button switch 14. The low-voltage positive terminal switch is connected to the DC charging gun input terminal through the low-voltage positive contact switch 15. One end of the low-voltage positive power button switch 14 is connected to the voltage converter, and the other end of the low-voltage positive power button switch 14 is connected between the low-voltage positive terminal switch and the low-voltage positive contact switch 15.

[0064] For example, the low-voltage positive terminal power button switch is connected to the voltage converter 17 and can be responsible for closing or opening the low-voltage power at the A+ terminal output of the voltage converter. The adjustment range of its low-voltage output is 0-24V. The low-voltage positive terminal contact switch 15 is responsible for closing or opening the A+ power input from the DC charging pile under test to the DC charging gun input terminal 1. When the tester needs to adjust the A+ voltage by himself using the voltage converter 17, he can disconnect the A+ power input from the DC charging pile under test in advance through the low-voltage positive terminal contact switch 15.

[0065] For example, a low-voltage positive contact switch can be represented as an A+ contact switch, and a low-voltage positive terminal power button switch 14 can be represented as an A+ terminal power button switch.

[0066] In some embodiments, the contact switch further includes a first charging connection confirmation terminal switch, a second charging connection confirmation terminal switch, and a protective grounding terminal switch. The low-voltage component also includes a plurality of low-voltage adjustable resistors. The first charging connection confirmation terminal switch, the second charging connection confirmation terminal switch, and the protective grounding terminal switch are respectively connected to the DC charging gun input terminal through corresponding low-voltage adjustable resistors.

[0067] For example, the low-voltage adjustable resistor 12 can adjust the resistance value of the connection lines of the first charging connection confirmation line terminal switch, the second charging connection confirmation line terminal switch, and the protective grounding line terminal switch, thereby simulating fault scenarios such as communication interruption, poor connection, and half-connection state.

[0068] Optionally, the low-voltage adjustable resistor 12 is a metal film adjustable resistor or a wire-wound adjustable resistor, and the resistance value of the variable resistor includes 200Ω, 500Ω, 970Ω, and 1030Ω. The circuit connected to the adjustable resistor terminal includes CC1, CC2, and PE.

[0069] Optionally, the low-voltage component also includes a low-voltage adjustable resistor panel 13, on which a low-voltage adjustable resistor 12 is disposed, which can be used to distinguish the low-voltage adjustable resistor area, thus reducing the risk of electric shock.

[0070] In some embodiments, the low-voltage component also includes a protective grounding terminal 16, which is connected between the protective grounding terminal switch and the DC charging gun input terminal 1.

[0071] For example, the protective grounding wire and the protective grounding wire terminal switch of the DC charging gun input terminal 1 are grounded through the protective grounding terminal 16 to ensure stable and reliable DC charging signal interaction.

[0072] For example, the first charging connection confirmation line terminal switch, the second charging connection confirmation line terminal switch, and the protective grounding line terminal switch can be respectively referred to as CC1 terminal switch, CC2 terminal switch, and PE terminal switch.

[0073] In some embodiments, the signal acquisition component also includes a recorder button switch 18, and the power supply terminal of the bus data recorder is connected to the power supply terminal of the bus data recorder 23 via the recorder button switch 18.

[0074] For example, the recorder button switch 18 is used to close or open the low voltage output from the voltage converter 17 to the bus data recorder 23.

[0075] In some implementations, the signal acquisition component further includes a fast-charging CAN bus bus interface 21 and a fast-charging CAN bus public interface 22. The fast-charging CAN bus bus interface 21 is connected to the communication connection port of the DC charging pile / electric vehicle under test, and the fast-charging CAN bus public interface 22 is connected to the fast-charging CAN bus bus interface 21 and the bus data recorder 23, respectively.

[0076] For example, the fast charging CAN bus bus interface 21 is a communication connection port connecting the charging pile and the vehicle. The fast charging CAN bus public interface 22 is used to connect to the fast charging CAN bus bus interface 21. After connection, the fast charging CAN bus data is collected or observed through the bus data recorder 23.

[0077] In some implementations, the signal acquisition component also includes a fast-charging CAN terminating resistor 22a, which is connected between the DC charging gun input terminal 1 and the contact switch 10.

[0078] For example, by setting the fast charging CAN terminal resistor 22a, testers can choose whether to add a terminal resistor according to the different vehicle models, effectively ensuring the stability of network communication.

[0079] Optionally, the signal acquisition component also includes a 220V AC three-prong plug 19, through which the voltage converter 17 is supplied with power. The signal acquisition component also includes a 220V AC input harness 20, through which 220V power is transmitted to the voltage converter 17.

[0080] For example, DC+ and DC- are the positive and negative terminals of a high-voltage power supply line, respectively. These lines are responsible for transmitting high-power DC current, with high voltage (such as 200-750V DC or higher) and high current (up to hundreds of amperes). A+ and A- are the positive and negative terminals of a low-voltage power supply line, respectively. They are responsible for transmission, and the voltage is low (such as 24V) and the current is small. Before and during charging, the electric vehicle's Battery Management System (BMS) needs to operate, but the vehicle may be in a power-off state during this time. Therefore, the charging station needs to provide a low-voltage power supply to power it; where: S+: Positive terminal of low-voltage auxiliary power supply, usually 12V or 24V DC positive terminal, used to power vehicle BMS and other control systems; S-: Negative terminal of low-voltage auxiliary power supply, corresponding to the negative terminal of low-voltage auxiliary power supply.

[0081] For example, the first charging connection confirmation line terminal switch and the second charging connection confirmation line terminal switch are respectively connected to the CC1 line and the CC2 line; the CC1 line and the CC2 line are data lines for communication between the charging pile and the electric vehicle, ensuring a safe and orderly charging process; wherein: The CC1 line is the charging connection confirmation line 1, used to detect whether the DC charging gun and the vehicle socket are fully and reliably connected. There is a locking device on the charging gun head. When the gun is fully inserted and locked, it will change the resistance of the CC1 circuit. The vehicle judges the connection status by detecting this resistance value. If the connection is unreliable, the charging process will not start. The CC2 line is the charging connection confirmation line 2, used to check whether the DC charging gun and the output cable of the charging pile are properly connected; on the gun wire side of the charging pile, there is a resistor related to CC2, used to confirm that the gun wire itself is not detached or damaged.

[0082] For example, the protective grounding wire PE is used to reliably ground metal parts such as the charging pile casing and the gun head casing; when a fault such as leakage occurs, the current will be conducted to the ground through the PE wire, thereby triggering the leakage protection device to cut off the power supply and prevent people from being electrocuted.

[0083] For example, the charging station and the electric vehicle communicate via a fast-charging CAN bus. The fast-charging CAN bus is a controller area network (CLAN) communication line. In DC charging, the charging station and the vehicle's battery management system (BMS) communicate in real time via this fast-charging CAN bus. Optionally, the BMS sends battery voltage, current requirements, state of charge (SOC), temperature, and fault information to the charging station, which then precisely adjusts the output voltage and current according to the instructions. This is crucial for achieving "on-demand charging" and ensuring battery safety.

[0084] In some implementation scenarios, combined with Figure 1 As shown in the embodiments of this application, the adjustment device for the DC charging interface includes a high-voltage component, a low-voltage component, and a signal acquisition component. Specific implementation examples are as follows: High-voltage components include: The DC charging gun input terminal 1 is responsible for connecting to the DC charging pile charging gun, receiving the signal transmitted by the charging pile and the high voltage DC power, and ensuring stable and reliable signal and high voltage DC power transmission. Output terminal 2 of the DC charging gun is responsible for transmitting the processed or regulated charging pile signal and high-voltage DC power to the vehicle. The input and output sockets are the new national standard GB / T20234 9-hole DC vehicle charging socket for automobile charging guns. The plug and socket are connected by terminals. The terminals are made of spring-loaded contact material, which has low contact resistance, gentle insertion and extraction force, long life, vibration resistance and impact resistance. The rated voltage of the positive terminal and the negative terminal does not exceed 750V and the rated current does not exceed 250A. The high-voltage DC input terminal harness 3 includes a positive terminal DC+ and a negative terminal DC-, which is used to receive the high-voltage DC power input from the charging pile and transmit it to the high-voltage terminal panel. The high-voltage DC output harness 4, including the positive terminal DC+ and the negative terminal DC-, is responsible for outputting the processed or regulated high-voltage DC power to the vehicle end. The input / output high-voltage harness uses polyethylene insulation material, which has good heat resistance and wear resistance. The wires are made of high-purity copper, which has good conductivity and mechanical strength to ensure efficient current transmission and durability. The high-voltage harness is designed with a shielding layer to reduce electromagnetic interference (EMI) and improve circuit stability. It uses conductive polymer material to shield external electromagnetic interference and internal electromagnetic radiation. Fuse 5 is an electrical appliance connected in series in the circuit. When the tester performs an abnormal operation (mistake) and short-circuits it, the current will continue to increase. The increased current may damage some important or valuable components in the circuit, or even cause fire and personal injury. Therefore, the corresponding fuse should be selected for protection according to the charging voltage / current rating of 750V / 250A and 950V / 500A. The high-voltage DC negative terminal adjustable resistor 6 is used to simulate a short circuit fault (low insulation resistance) in a high-voltage DC circuit to verify the vehicle's high-voltage insulation detection capability and control strategy under relevant poor insulation scenarios. The high-voltage adjustable resistor withstands a voltage range of 500-1000V. To prevent electrical breakdown, a slender substrate with high withstand voltage is selected, and the resistive film is made into a spiral strip. Moreover, the voltage gradient along the length direction must not exceed 500V / cm. Grounding switch 7 is connected to the DC-line of high-voltage DC input harness 3. It is used to simulate poor insulation in a high-voltage circuit when testing personnel need to do so. First, the grounding switch is turned on, and then the adjustable resistor of the high-voltage DC harness is adjusted to achieve the scenario of poor insulation in the high-voltage system. Under normal non-testing conditions, the grounding switch is in the normally closed state.

[0085] The high-voltage DC terminal switch panel 8 is used to distinguish high-voltage areas, where the risk of electric shock is high, and is affixed with a "High Voltage Danger Do Not Touch" sign; The high-voltage DC+ / DC- contact switch 9 is a contact switch on the high-voltage DC terminal switch panel 8. It is responsible for closing and opening the high-voltage DC power transmitted from the charging pile, simulating fault scenarios such as undervoltage charging voltage at the vehicle end, and verifying the vehicle's control and handling of undervoltage charging voltage. The DC+ / DC- contact switch also withstands a voltage range of 500-1000V, and has a large current, long duration, and is prone to high temperature. Considering comprehensive indicators such as conductivity, arc resistance, and price, copper is the most widely used contact material, so copper is selected as the contact material for the contact switch. Low-voltage components include: Contact switch 10 is used to close and disconnect the DC charging conduction signal transmitted from the charging pile, simulate scenarios such as undervoltage, communication interruption, poor connection, and half-connection state, and verify the vehicle's control and handling of various faults, including terminal switches such as S+, S-, CC1, CC2, PE, A+, and A-. Switch area panel 11 is used to distinguish low-voltage areas, where the risk of electric shock is lower. The low-voltage adjustable resistor 12 is a metal film adjustable resistor or a wire-wound adjustable resistor. The resistance values ​​of the variable resistor include 200Ω, 500Ω, 970Ω, and 1030Ω. The adjustable resistor terminals include CC1, CC2, and PE. The low-voltage adjustable resistor panel 13 is used to distinguish the low-voltage adjustable resistor area, which has a lower risk of electric shock. The low-voltage positive terminal power push button switch 14 is responsible for closing or opening the low-voltage power at the A+ terminal of the voltage converter output, with a low-voltage output range of 0-24V; The low-voltage positive contact switch 15 is responsible for closing or opening the A+ power input of the charging pile itself. When the tester needs to adjust the A+ voltage, the A+ power input of the charging pile itself must be disconnected in advance. The grounding terminal 16 of the protection line is grounded by connecting the protection grounding wire PE to ensure stable and reliable DC charging signal interaction. The signal acquisition components include: The voltage converter 17 is responsible for providing power to the bus data logger 23 and the A+ wake-up source, and outputs an adjustable voltage range of 0-24V. The recorder button switch 18 is responsible for closing or opening the low-voltage power supply at the data recorder end of the voltage converter output; The 220V AC three-prong plug 19 is the input power for the voltage converter 23; 220V AC input harness 20 is used to transmit power to voltage converter 23; The fast charging CAN bus bus interface 21 is the communication connection port between the charging pile and the vehicle. The fast charging CAN bus public interface 22 is used to connect to the fast charging CAN bus bus interface 21, and after connection, fast charging CAN bus data can be collected or observed. The terminating resistor is 22A. Depending on the different vehicle models, testers can choose whether to add a terminating resistor to ensure the stability of network communication. The bus data logger 23 is used to record fast-charging CAN bus data at a baud rate of 250kb / s, and it starts collecting data as soon as it is powered on. In some embodiments, the working process of the DC charging interface adjustment device provided in this application is exemplified as follows: The DC charging gun is connected to the DC charging gun input socket. The DC charging gun output socket uses a dual vehicle plug connection, meaning one end connects to the DC charging gun output socket and the other vehicle plug connects to the vehicle. After the charging station starts charging, conductive signals such as S+, S-, CC1, CC2, PE, A+, and A-, as well as DC+ and DC- high-voltage DC power, flow from the DC charging gun input socket through the DC charging port regulating device to the DC charging gun output socket, and finally to the vehicle, completing the entire DC charging link interaction. When testers simulate a high-voltage insulation failure scenario, they can automatically disconnect the high-voltage DC-DC contact switch and close the high-voltage DC-DC-high-voltage harness grounding and grounding switch via the DC charging interface adjustment device. Adjusting the adjustable resistor at the negative terminal of the high-voltage DC circuit will then achieve the insulation failure scenario. This satisfies the testing and verification requirements for multiple scenarios, such as DC charging high-voltage undervoltage or high-voltage interruption, further verifying the vehicle's high-voltage control processing logic and instrument display logic under various insulation failure scenarios. When testers simulate adjusting the A+ power supply voltage, they automatically disconnect the low-voltage positive terminal contact switch, close the low-voltage positive terminal power button switch and the low-voltage terminal contact switch via the DC charging interface adjustment device, start the voltage converter, adjust the voltage, and complete the A+ power supply voltage adjustment function. This satisfies the testing and verification of multiple scenarios, such as charging with a charging pile plug without an A+ wake-up source and charging with a charging pile plug that always has an A+ wake-up source, further verifying the vehicle's DC charging control processing logic and instrument prompt logic under various A+ abnormal power supply scenarios. Testers will simulate a scenario where the CC1 or CC2 connection confirmation signal resistance is abnormal. By adjusting the DC charging interface adjustment device, the low-voltage end contact switch will be automatically closed, and the low-voltage end adjustable resistor will be adjusted. This will satisfy the testing and verification of multiple scenarios, such as charging with a charging gun when there is no CC1 or CC2 connection confirmation signal, and loss of CC1 or CC2 connection confirmation signal during charging. This will further verify the vehicle's DC charging control processing logic and instrument prompt logic under various abnormal connection confirmation signal scenarios.

[0086] By way of example, the DC charging interface adjustment device provided in the embodiments of this application has at least the following beneficial effects: 1. Built-in bus data logger, baud rate 250kb / s, data acquisition starts upon power-on, and has the function of automatically acquiring fast charging communication messages; 2. DB9 nine-port standard communication interface, compatible with various data acquisition devices; 3. Features wake-up source A+ voltage adjustment function, with an adjustment range of 0-24V; 4. Equipped with charging pile-vehicle connection confirmation CC1 and CC2 resistance adjustment functions, with an adjustment range of 200-1030Ω; 5. It has the function of freely matching the charging pile-vehicle end S+ and S1 terminal resistors (120Ω); 6. DC+, DC-, PE, S+, S-, CC1, CC2, A+, and A- are respectively led out to contact switches and test interfaces, which can realize simulated scenarios such as high voltage undervoltage, communication loss, poor connection, and half-connection state; 7. The high-voltage side panel, low-voltage side panel, and adjustable resistor panel are designed in separate areas, making the panels simple and easy to use.

[0087] It should be understood that the phrases "in this embodiment," "in this application embodiment," or "as an optional implementation" throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in this embodiment," "in this application embodiment," or "as an optional implementation" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0088] In the various embodiments of this application, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0089] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims.

Claims

1. An adjustment device for a DC charging interface, characterized in that, include: The high-voltage component includes a DC charging gun input terminal, a DC charging gun output terminal, and a high-voltage DC terminal switch panel. The DC charging gun input terminal is connected to the DC charging gun output terminal through the high-voltage DC terminal switch panel. The DC charging gun input terminal is connected to the DC charging pile to be tested, and the DC charging gun output terminal is connected to the electric vehicle to be tested. The low-voltage component includes a contact switch and a switch area panel, wherein the contact switch is matched with the switch area panel, and the contact switch is respectively connected to the input terminal of the DC charging gun and the output terminal of the DC charging gun; The signal acquisition component includes a voltage converter and a bus data logger. The voltage converter is connected to the power supply terminal of the bus data logger, and the data terminal of the bus data logger is connected to the contact switch and the input terminal of the DC charging gun, respectively.

2. The adjustment device for the DC charging interface according to claim 1, characterized in that, The high-voltage component also includes a high-voltage DC input terminal harness and a high-voltage DC output terminal harness. The input terminal of the DC charging gun is connected to the high-voltage DC terminal switch panel through the high-voltage DC input terminal harness, and the high-voltage DC terminal switch panel is connected to the output terminal of the DC charging gun through the high-voltage DC output terminal harness.

3. The adjustment device for the DC charging interface according to claim 2, characterized in that, The high-voltage component also includes a fuse mechanism, and the positive terminal wire in the high-voltage DC input terminal harness is connected to the high-voltage DC terminal switch panel through the fuse mechanism.

4. The adjustment device for the DC charging interface according to claim 2, characterized in that, The high-voltage component also includes an adjustable resistor at the negative terminal of the high-voltage DC circuit. The negative terminal of the high-voltage DC input harness is connected to the high-voltage DC switch panel through the adjustable resistor at the negative terminal of the high-voltage DC circuit.

5. The adjustment device for the DC charging interface according to claim 2, characterized in that, The high-voltage component also includes a grounding switch, which is connected to the high-voltage DC input terminal harness.

6. The adjustment device for the DC charging interface according to claim 1, characterized in that, The contact switch also includes a low-voltage positive terminal switch and a low-voltage negative terminal switch. The input terminal of the DC charging gun is connected to the output terminal of the DC charging gun through the low-voltage positive terminal switch and the low-voltage negative terminal switch.

7. The adjustment device for the DC charging interface according to claim 6, characterized in that, The low-voltage component also includes a low-voltage positive terminal contact switch and a low-voltage positive terminal power button switch. The low-voltage positive terminal sub-switch is connected to the input terminal of the DC charging gun through the low-voltage positive terminal contact switch. One end of the low-voltage positive terminal power button switch is connected to the voltage converter, and the other end of the low-voltage positive terminal power button switch is connected between the low-voltage positive terminal sub-switch and the low-voltage positive terminal contact switch.

8. The adjustment device for the DC charging interface according to claim 1, characterized in that, The contact switch also includes a first charging connection confirmation terminal switch, a second charging connection confirmation terminal switch, and a protective grounding terminal switch. The low-voltage component also includes multiple low-voltage adjustable resistors. The first charging connection confirmation terminal switch, the second charging connection confirmation terminal switch, and the protective grounding terminal switch are respectively connected to the DC charging gun input terminal through the corresponding low-voltage adjustable resistors.

9. The adjustment device for the DC charging interface according to claim 8, characterized in that, The low-voltage component also includes a protective grounding terminal, which is connected between the protective grounding terminal switch and the DC charging gun input terminal.

10. The adjustment device for the DC charging interface according to claim 1, characterized in that, The signal acquisition component also includes a recorder button switch, and the power supply terminal of the bus data recorder is connected to the power supply terminal of the bus data recorder through the recorder button switch.

11. The adjustment device for the DC charging interface according to claim 1 or 10, characterized in that, The signal acquisition component also includes a fast-charging CAN bus bus interface and a fast-charging CAN bus public interface. The fast-charging CAN bus bus interface is connected to the communication connection port of the DC charging pile under test / the electric vehicle under test, and the fast-charging CAN bus public interface is connected to the fast-charging CAN bus bus interface and the bus data recorder, respectively.

12. The adjustment device for the DC charging interface according to claim 1 or 10, characterized in that, The signal acquisition component also includes a fast-charging CAN terminating resistor, which is connected between the DC charging gun input terminal and the contact switch.

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