Charging system and charging confirmation method

Abstract

This application relates to a charging system and a charging verification method. The charging system includes: a vehicle-side controller; a first diode, the positive terminal of which is electrically connected to a charging pile; and an auxiliary verification unit electrically connected to the negative terminal of the first diode and the vehicle-side controller. The auxiliary verification unit includes at least one digital potentiometer, which has a communication interface and a resistor interface. The communication interface is electrically connected to the vehicle-side controller and is used to receive a resistance adjustment signal sent by the vehicle-side controller. The resistor interface is electrically connected to the negative terminal of the first diode and ground, respectively, and is used to output a target impedance adjusted according to the resistance adjustment signal. This application can quickly set and switch the target impedance according to different vehicle conditions, enabling rapid matching between the charging pile and the vehicle, shortening the diagnostic testing time, and improving the circuit response speed and charging efficiency. Because the digital potentiometer occupies little space and has few interfaces, it reduces the circuit board area, reduces the number of components, and is simpler and easier to use.

Description

Technical Field

[0001] This application relates to the field of charging, and more particularly to a charging system and a charging verification method. Background Technology

[0002] With the development of new energy vehicles, the charging interface circuits for electric vehicles from different countries are becoming increasingly diverse. To adapt to globalization, charging interface circuits need compatible designs, leading to the emergence of the ChaoJi charging standard, spearheaded by China. "ChaoJi" corresponds to the Chinese word for "super" and sounds similar to the English word "charge," reflecting a consideration of cultural differences. In practical applications, the ChaoJi charging standard requires both forward and backward compatibility. Forward compatibility means the ChaoJi standard can be compatible with older charging station interfaces, while backward compatibility means the ChaoJi standard is scalable, reserving ample space for future technological upgrades.

[0003] In related technologies, in order to meet the ChaoJi charging standard, and for the purposes of charging and safety, an auxiliary confirmation circuit is usually set in the battery management system at the vehicle end. Figure 1 A schematic diagram of an auxiliary verification circuit in related technologies is shown. For example... Figure 1 As shown, the auxiliary confirmation circuit in the related technology consists of multiple parallel auxiliary channels. Each auxiliary channel consists of a single-channel switch and a pull-down resistor electrically connected to the single-channel switch. The single-channel switch controls whether the corresponding pull-down resistor is connected to the vehicle through the general-purpose input / output (GPIO) of the vehicle-side processor, thereby achieving the purpose of switching the overall equivalent resistance value of the auxiliary confirmation circuit and realizing the matching of charging interfaces in different countries.

[0004] However, due to the varying matching impedances of charging interfaces in different countries and the large number of them, the aforementioned auxiliary confirmation circuit requires numerous switching circuits and resistive components. This increases the number of discrete components on the circuit board, resulting in a larger board area and excessive use of processor control pins. Furthermore, using switches to switch circuits leads to slow circuit response times, reducing the charging efficiency of the charging interface. Summary of the Invention

[0005] In view of this, this application proposes a charging system and charging verification method that can quickly set and switch target impedances according to different vehicle conditions, thereby enabling rapid matching between the charging pile and the vehicle, shortening diagnostic testing time, and improving circuit response speed and charging efficiency. Simultaneously, because digital potentiometers occupy little space and require fewer interfaces, the circuit board area is reduced, the number of components is decreased, and the system is simpler and easier to use.

[0006] In a first aspect, embodiments of this application provide a charging system, including: a vehicle-side controller; a first diode, the positive terminal of which is electrically connected to a charging pile; and an auxiliary confirmation unit, which is electrically connected to the negative terminal of the first diode and the vehicle-side controller; wherein the auxiliary confirmation unit includes at least one digital potentiometer, the digital potentiometer having a communication interface and a resistor interface, the communication interface being electrically connected to the vehicle-side controller for receiving a resistance adjustment signal sent by the vehicle-side controller; and the resistor interface being electrically connected to the negative terminal of the first diode and ground, respectively, for outputting a target impedance adjusted according to the resistance adjustment signal.

[0007] Secondly, embodiments of this application provide a charging confirmation method, which is applied to the charging system. The charging confirmation method includes: acquiring the target impedance of the target vehicle; generating a resistance adjustment signal based on the target impedance and sending the resistance adjustment signal to the communication interface of at least one of the digital potentiometers; and controlling the resistance interface of the digital potentiometers to output the target impedance based on the resistance adjustment signal.

[0008] By using digital potentiometers to replace discrete components in related technologies, this application reduces the number of components and enables rapid setting and switching of target impedance based on different vehicle conditions using generated adjustment signals. This allows for quick matching between the charging station and the vehicle, shortens diagnostic testing time, and improves circuit response speed and charging efficiency. Furthermore, digital potentiometers occupy less space and require fewer interfaces, reducing circuit board area, decreasing component count, and making them simpler and easier to use. Attached Figure Description

[0009] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0010] Figure 1 A schematic diagram of an auxiliary verification circuit in the related art is shown.

[0011] Figure 2 A schematic diagram of a charging system according to an embodiment of this application is shown.

[0012] Figure 3 A schematic diagram of the auxiliary verification unit according to an embodiment of this application is shown.

[0013] Figure 4 This diagram illustrates the backward compatibility of the charging system according to an embodiment of this application.

[0014] Figure 5 A flowchart illustrating the charging confirmation method according to an embodiment of this application is shown. Detailed Implementation

[0015] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0016] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0017] In the description of this application, it should be noted that, unless otherwise explicitly stated and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0018] The following disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials. In some instances, methods, means, elements, and circuits well known to those skilled in the art are not described in detail in order to highlight the main points of this application.

[0019] Figure 2 A schematic diagram of a charging system according to an embodiment of this application is shown. Figure 2 As shown, the charging system of this application includes a charging pile and a vehicle electrically connected to the charging pile. The charging pile may include a charger 25 and a vehicle plug 24 electrically connected to the charger 25. The vehicle plug 24 conforms to the ChaoJi standard and can adopt a 7-pin end face design. For example, the vehicle plug 24 has seven end faces: DC+, DC-, PE, S+, S-, CC1, and CC2.

[0020] In one embodiment, the charging system may include an auxiliary verification unit, a first diode, a vehicle-side controller 21, and a vehicle socket 23. The first diode may be a reverse-biased diode. The vehicle-side controller 21 may be located in the vehicle's battery management system (BMS). The positive terminal of the first diode is electrically connected to the charging pile, and the auxiliary verification unit is electrically connected to the negative terminal of the first diode and the vehicle-side controller 21.

[0021] In one embodiment, the vehicle socket 23 also adopts a 7-pin end face design. For example, the vehicle socket 23 has seven end faces: DC+, DC-, PE, S+, S-, CC1, and CC2. The vehicle plug 24 cooperates with the vehicle socket 23, such that the end face of the vehicle plug 24 is electrically connected to the end face of the vehicle socket 23 one by one.

[0022] In one embodiment, the auxiliary confirmation unit includes at least one digital potentiometer 22, which is provided with a communication interface and a resistor interface. The communication interface is electrically connected to the vehicle-side controller 21 and is used to receive the impedance adjustment signal sent by the vehicle-side controller 21. The resistor interface is electrically connected to the negative terminal of the first diode and ground respectively and is used to output the target impedance adjusted according to the impedance adjustment signal.

[0023] By using digital potentiometers to replace discrete components in related technologies, the embodiments of this application can reduce the number of components and quickly set and switch the target impedance according to the different vehicle conditions using the generated impedance adjustment signal. This enables rapid matching between the charging pile and the vehicle, shortens the diagnostic testing time, and improves the circuit response speed and charging efficiency. At the same time, because digital potentiometers occupy less space and require fewer interfaces, the circuit board area is reduced, the number of components is decreased, and the device is simpler and easier to use.

[0024] Figure 3 A schematic diagram of an auxiliary verification unit according to an embodiment of this application is shown. Figure 3 In this configuration, except for the first diode D1, the rest can all belong to the auxiliary confirmation unit. The digital potentiometer can be... Figure 3 U3.

[0025] In one embodiment, such as Figure 3 As shown, the communication interface may include a first communication terminal SCL and a second communication terminal SDA. The first communication terminal SCL is used to transmit clock signals, and the second communication terminal SDA is used to transmit impedance adjustment data signals. For example, the communication interface may be an I2C interface. Using an I2C interface to implement communication between the digital potentiometer 22 and the vehicle-side processor can improve communication efficiency while reducing the pin occupancy of the vehicle-side processor. It is simple, convenient, and highly versatile.

[0026] In one embodiment, see Figure 3 The resistor interface includes: a first output terminal A, which is electrically connected to the cathode of the first diode D1, and the cathode of the first diode D1 is the second detection point, i.e., the lower... Figure 4 Detection point 2; second output terminal B, the second output terminal B is grounded.

[0027] in, Figure 3 The digital potentiometer 22 can internally incorporate a circuit topology consisting of multiple resistors. In practical applications, through clever design, multiple precise resistance levels can be simulated using a relatively small number of resistors, thus simplifying the control of the overall equivalent impedance of the digital potentiometer 22 via digital signals. It is understood that the internal structure of the digital potentiometer 22 can be selected according to actual needs, and this application does not limit the specific internal parameters of the digital potentiometer 22.

[0028] In one embodiment, the auxiliary confirmation circuit further includes an input unit electrically connected to the charging pile and the positive terminal of the first diode D1. Specifically, see... Figure 3The input unit includes: a protection diode (TVS), one end of which is electrically connected to the positive terminal of the first diode (D1), and the other end of which is grounded; and a first capacitor (C1), one end of which is electrically connected to the positive terminal of the first diode, and the other end of which is grounded. The protection diode can be a transient voltage suppressor (TVS) used to absorb surge power when subjected to a reverse transient high-energy impact, clamping the voltage between its terminals to a predetermined value, effectively protecting the electronic circuit from damage caused by various surge pulses; the capacitor C1 can be used for filtering.

[0029] In one embodiment, the auxiliary confirmation circuit further includes a voltage divider unit electrically connected to the negative terminal of the first diode D1. Specifically, see... Figure 3 The voltage divider unit includes: a first resistor R2, one end of which is electrically connected to the negative terminal of the first diode D1; a second resistor R3, one end of which is electrically connected to the other end of the first resistor R2, and the other end of which is electrically connected to the vehicle-side controller 21; a third resistor R4, one end of which is electrically connected to the other end of the first resistor R2, and the other end of which is grounded; and a second capacitor C2, one end of which is electrically connected to the other end of the first resistor R2, and the other end of which is grounded.

[0030] In one embodiment, the digital potentiometer 22 is further provided with a power interface, which may include a power supply terminal VCC. See details... Figure 3 The voltage divider unit further includes: a second anti-reverse diode D2, the positive terminal of which is grounded and the negative terminal of which is electrically connected to the other end of the second resistor R3; and a third anti-reverse diode D3, the positive terminal of which is electrically connected to the negative terminal of which is connected to the negative terminal of which is connected to the power interface, for providing power to the digital potentiometer 22.

[0031] Figure 4 This diagram illustrates the backward compatibility of the charging system according to an embodiment of this application. Figure 4As shown, the charger 25 includes: a charging power supply U1, the negative terminal of which is grounded; a fourth resistor R1, one end of which is electrically connected to the positive terminal of the charging power supply U1; and a fifth resistor R1', one end of which is electrically connected to the other end of the fourth resistor R1, and the other end of which is electrically connected to the positive terminal of the first diode through the vehicle front and the vehicle socket 23. The other end of the fifth resistor R1' is a first detection point, i.e. Figure 4 The detection point 1; the first switch S1, which is connected in parallel across the fifth resistor R1'.

[0032] In one embodiment, see Figure 4 The vehicle plug 24 includes a sixth resistor Rc, one end of which is grounded and the other end of which is electrically connected to the vehicle. Figure 4 PE in the text represents ground.

[0033] In one embodiment, see Figure 4 The vehicle also includes: a power supply U2 to be charged, the negative terminal of which is grounded; a seventh resistor Rv', one end of which is electrically connected to the positive terminal of the power supply U2 to be charged; and a second switch Sv, one end of which is electrically connected to the other end of the seventh resistor Rv', the other end of which is electrically connected to the other end of the sixth resistor Rc, and the other end of which is a third detection point. Figure 4 Detection point 3; eighth resistor Rv, one end of which is electrically connected to the positive terminal of the power source U2 to be charged; third switch Sv', one end of which is electrically connected to the other end of the eighth resistor Rv, and the other end of which is electrically connected to one end of the second switch Sv.

[0034] The power source U2 to be charged can be a battery pack on the vehicle that needs to be charged. It is understood that this application does not limit the type of battery pack.

[0035] In one embodiment, the charger 25 further includes a charging-side controller electrically connected to the first switch S1 for controlling the on / off state of the first switch S1. Both the charging-side controller and the vehicle-side controller 21 can be processors (MCUs). The charging-side controller can control the internal working processes of the charger 25, and the vehicle-side controller 21 can control the internal working processes of the vehicle.

[0036] In addition, this application also provides a charging confirmation method, which is applied to the charging system. Figure 5A flowchart illustrating the charging confirmation method according to an embodiment of this application is shown, such as... Figure 5 As shown, the charging confirmation method includes:

[0037] Step S1: Obtain the target impedance of the target vehicle;

[0038] The target impedance can be the impedance to which the digital potentiometer is adjusted according to the different needs of the vehicle. Prior to step S1, the charging confirmation method further includes:

[0039] Step S101: Determine whether the vehicle plug and vehicle socket are fully connected;

[0040] After connecting the vehicle plug 24 to the vehicle socket 23, it is necessary to determine whether the vehicle plug 24 and the vehicle socket 23 are fully connected. If the vehicle plug 24 and the vehicle socket 23 are fully connected, the vehicle can be put into an inoperable state through interlocking or other control methods to prepare for charging.

[0041] On the charger 25 side, before connecting the vehicle plug 24 to the vehicle socket 23, the charging-side controller can determine whether the internal wiring of the charger 25 is properly connected by measuring the voltage value at a first detection point. For example, when the voltage at the first detection point is 10.8V, the wiring is confirmed to be normal, and vehicle connection for charging is permitted.

[0042] After the vehicle plug 24 is connected to the vehicle socket 23, the charging-side controller can determine whether the vehicle plug 24 and the vehicle socket 23 are fully connected by measuring the voltage value at the first detection point (CC1 circuit). When the voltage value at the first detection point is 2.95V, it is confirmed that the vehicle interface is fully connected. Subsequently, the controller closes the first switch S1, enters the handshake start phase, and begins to periodically send communication handshake messages. At this time, the voltage at the first detection point is 8.98V.

[0043] Furthermore, determining whether the vehicle plug and vehicle socket are fully connected includes:

[0044] Step S1001: Control the second switch to open and obtain the first voltage value of the second detection point;

[0045] Step S1002: Control the second switch to close and obtain the second voltage value at the third detection point;

[0046] Step S1003: Determine whether the vehicle plug 24 and the vehicle socket 23 are fully connected based on the first voltage value and the second voltage value.

[0047] In one embodiment, when the second switch Sv is open, the vehicle-side controller 21 can determine whether the vehicle plug 24 and the vehicle socket 23 are fully connected by detecting the first voltage value at the second detection point (CC1 circuit). When the first voltage value at the second detection point is 8.28V, it is confirmed that the vehicle interface is connected. Next, the vehicle controller can close the second switch Sv and determine whether the vehicle plug 24 and the vehicle socket 23 are fully connected by detecting the second voltage value at the third detection point (CC2 circuit), confirming that the vehicle interface is fully connected and connected to the charger 25. After confirming that the connection is correct, the electronic lock can be activated for reliable locking.

[0048] Step S102: With the vehicle plug 24 and vehicle socket 23 fully connected, obtain the target impedance of the target vehicle.

[0049] Since different target vehicle models use different standards, it is necessary to obtain the target impedance applicable to that specific vehicle model in advance. There are various ways to obtain the target impedance, and this application is not limited to any particular method.

[0050] Step S2: Generate a resistance adjustment signal based on the target impedance, and send the resistance adjustment signal to the communication interface of at least one of the digital potentiometers;

[0051] The impedance adjustment signal can be a binary string used to control whether the resistor or capacitor inside the digital potentiometer 22 is connected to the entire circuit, so as to adjust the digital potentiometer 22 to the target impedance.

[0052] It should be noted that the charging confirmation method of this application can be executed by the vehicle-side controller, therefore the generation of the adjustment signal based on the target impedance can also be performed by the vehicle-side controller. It is understood that there can be multiple ways to generate the adjustment signal based on the target impedance, and this application is not limited to any particular method.

[0053] Step S3: Control the resistor interface of the digital potentiometer to output the target impedance based on the impedance adjustment signal.

[0054] The resistor interface can directly output the target impedance and connect it to the entire circuit of the charging system, thereby achieving impedance matching on the vehicle side before charging.

[0055] Furthermore, the charging confirmation method also includes:

[0056] Step S41: Determine whether the output of the resistance interface of the digital potentiometer is the target impedance;

[0057] Further, determining whether the digital potentiometer is adjusted to the target impedance includes:

[0058] Step S411: Send a detection signal to the voltage divider unit;

[0059] In one embodiment, after the digital potentiometer 22 has been adjusted, a detection signal can be sent to the voltage divider unit via the vehicle-side controller 21. For details, see [link to relevant documentation]. Figure 3 It can send a detection signal AN_Chaoji_CC1 to the right side of R3 in the voltage divider unit, thereby detecting the third voltage value at the second detection point.

[0060] Step S412: Under the action of the detection signal, obtain the third voltage value of the second detection point;

[0061] Step S413: Determine whether the digital potentiometer is adjusted to the target impedance based on the third voltage value.

[0062] When the third voltage value meets the preset range, it indicates that the digital potentiometer 22 has been adjusted to the target impedance. At this time, the second switch Sv can be controlled to open to start the charging process, and the second switch Sv remains open during the charging process.

[0063] Step S42: If the output of the resistor interface of the digital potentiometer is the target impedance, send an impedance matching signal to the charging pile to indicate that the target impedance matching is complete; if the output of the resistor interface of the digital potentiometer is not the target impedance, regenerate the adjustment signal until the output of the resistor interface of the digital potentiometer is the target impedance.

[0064] The purpose of step S42 is to prevent errors or mistakes in the generated adjustment signal. In practical applications, the adjustment signal can be regenerated as needed. For example, if the impedance output of the resistor interface is too low, the adjustment signal can be regenerated to increase the impedance output of the resistor interface.

[0065] In summary, the embodiments of this application generate a resistance adjustment signal based on the target impedance of different types of target vehicles, and control the output of the target impedance through the resistor interface of the digital potentiometer based on the resistance adjustment signal. This allows for the rapid setting and switching of the target impedance according to the different types of vehicles, thereby enabling the charging pile and the vehicle to match quickly, reducing diagnostic testing time, and improving the circuit response speed and charging efficiency.

[0066] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0067] The charging system and charging confirmation method provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A charging system, characterized by, The vehicle side controller is connected with the first diode, the auxiliary confirmation unit, the charging pile and the input unit. The first diode is connected with the charging pile. The auxiliary confirmation unit is connected with the first diode and the vehicle side controller. The auxiliary confirmation unit includes at least one digital potentiometer. The digital potentiometer is provided with a circuit topology composed of multiple resistors. The digital potentiometer is provided with a communication interface and a resistor interface. The communication interface is connected with the vehicle side controller. The resistor interface is connected with the negative electrode of the first diode and the ground. The resistor interface includes a first output end and a second output end.

2. The charging system of claim 1, wherein, The first output end is connected with the negative electrode of the first diode. The second output end is grounded. The auxiliary confirmation unit further includes a voltage dividing unit.

3. The charging system of claim 1, wherein, The voltage dividing unit is connected with the negative electrode of the first diode. The voltage dividing unit includes a first resistor and a second resistor. The first resistor is connected with the negative electrode of the first diode.

4. The charging system of claim 3, wherein, The second resistor is connected with the vehicle side controller. The vehicle side controller sends a detection signal to the second resistor after the digital potentiometer is adjusted. The vehicle side controller detects whether the output of the resistor interface of the digital potentiometer is the target impedance. The input unit includes a protection diode and a first capacitor. The protection diode is connected with the positive electrode of the first diode. The first capacitor is connected with the positive electrode of the first diode. The voltage dividing unit further includes a third resistor and a second capacitor. The third resistor is connected with the other end of the first resistor. The second capacitor is connected with the other end of the first resistor. The digital potentiometer is further provided with a power interface. The voltage dividing unit further includes a second anti-reverse diode. The positive electrode of the second anti-reverse diode is grounded. The negative electrode of the second anti-reverse diode is connected with the other end of the second resistor. A third anti-reverse diode, a positive electrode of the third anti-reverse diode is electrically connected to a negative electrode of the second anti-reverse diode, and a negative electrode of the third anti-reverse diode is electrically connected to the power supply interface, for providing power supply for the digital potentiometer.

5. The charging system according to any one of claims 1-4, characterized in that, The charging machine comprises: a charging power supply, a negative electrode of the charging power supply being grounded; a fourth resistor, one end of the fourth resistor being electrically connected to a positive electrode of the charging power supply; a fifth resistor, one end of the fifth resistor being electrically connected to the other end of the fourth resistor, the other end of the fifth resistor being electrically connected to a positive electrode of the first diode through the vehicle plug and the vehicle socket, and the other end of the fifth resistor being a first detection point, wherein whether the internal circuit of the charging machine is connected normally is determined by detecting a voltage value of the first detection point; a first switch, the first switch being connected in parallel to the fifth resistor.

6. The charging system of claim 5, wherein, The vehicle plug comprises: a sixth resistor, one end of the sixth resistor being grounded, and the other end of the sixth resistor being electrically connected to the whole vehicle.

7. The charging system of claim 6, wherein, The whole vehicle further comprises: a to-be-charged power supply, a negative electrode of the to-be-charged power supply being grounded; a seventh resistor, one end of the seventh resistor being electrically connected to a positive electrode of the to-be-charged power supply; a second switch, one end of the second switch being electrically connected to the other end of the seventh resistor, the other end of the second switch being electrically connected to the other end of the sixth resistor, and the other end of the second switch being a third detection point, wherein whether the vehicle plug and the vehicle socket are completely connected is determined by the whole vehicle side controller by detecting a second voltage value of the third detection point; an eighth resistor, one end of the eighth resistor being electrically connected to the positive electrode of the to-be-charged power supply; a third switch, one end of the third switch being electrically connected to the other end of the eighth resistor, and the other end of the third switch being electrically connected to one end of the second switch.

8. The charging system of claim 5, wherein, The charging machine further comprises a charging side controller, the charging side controller being electrically connected to the first switch, for controlling on-off of the first switch.

9. A charge confirmation system, characterized by, The charging confirmation system comprises a charging pile and the charging system according to any one of claims 1-8.

10. A charge confirmation method characterized by, The charging confirmation method is applied to the charging system according to any one of claims 1-8, and the charging confirmation method comprises: obtaining a target impedance of a target whole vehicle; generating a resistance adjusting signal according to the target impedance, and sending the resistance adjusting signal to a communication interface of at least one digital potentiometer; controlling a resistance interface of the digital potentiometer to output the target impedance based on the resistance adjusting signal.

11. The charge confirmation method of claim 10, wherein, The charging confirmation method further comprises: determining whether the vehicle plug and the vehicle socket are completely connected; in the case that the vehicle plug and the vehicle socket are completely connected, obtaining a target impedance of a target whole vehicle.

12. The charge confirmation method of claim 11, wherein, The whole vehicle further comprises a to-be-charged power supply, a sixth resistor, a seventh resistor and a second switch, a negative electrode of the to-be-charged power supply being grounded, one end of the seventh resistor being electrically connected to a positive electrode of the to-be-charged power supply, one end of the second switch being electrically connected to the other end of the seventh resistor, one end of the sixth resistor being grounded, the other end of the second switch being electrically connected to the other end of the sixth resistor, and the other end of the second switch being a third detection point. The judging whether the vehicle plug is completely connected with the vehicle socket comprises: controlling the second switch to be off, and obtaining a first voltage value of the second detection point; controlling the second switch to be on, and obtaining a second voltage value of the third detection point; judging whether the vehicle plug is completely connected with the vehicle socket based on the first voltage value and the second voltage value.

13. The charging confirmation method according to any one of claims 10 to 12, characterized by, The charging confirmation method further comprises: judging whether the resistance interface output of the digital potentiometer is the target impedance; if the resistance interface output of the digital potentiometer is the target impedance, sending an impedance matching signal to the charging pile to indicate that the target impedance matching is completed; if the resistance interface output of the digital potentiometer is not the target impedance, re-generating a resistance adjusting signal until the resistance interface output of the digital potentiometer is the target impedance.

14. The charge confirmation method of claim 13, wherein, The judging whether the resistance interface output of the digital potentiometer is the target impedance comprises: sending a detection signal to the voltage dividing unit; under the action of the detection signal, obtaining a third voltage value of the second detection point; judging whether the digital potentiometer is adjusted to the target impedance according to the third voltage value.

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