Mode 2 charging gun supporting multiple power supplies

Abstract

The utility model discloses a two-mode charging gun supporting multiple power supplies. The two-mode charging gun comprises an AC vehicle plug, an on-cable control box, an adapter socket, an adapter plug and a power supply plug. The alternating current vehicle plug is used for being connected to a vehicle socket during charging, and the alternating current vehicle plug is connected with the on-cable control box; the on-cable control box is connected with the adapter socket; the adapter plug is connected with a power plug, and the power plug is used for being connected with a power supply; a resistor R0 is arranged in the adapter plug, and after the adapter plug is inserted into the adapter socket, the on-cable control box identifies the type of the current power plug by reading the resistance value of the resistor R0 and executes charging protection and control through the on-cable control box. By designing the compatible charging control box, the charging gun is at least compatible with two charging power supplies of a power supply plug of a charging pile and a standard plug in commercial power, so that the compatibility of the charging gun is improved, the repeated development of charging gun products is reduced, and the cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of new energy automobile charging, especially to a mode two charging gun supporting multiple power sources. BACKGROUND

[0002] With the increasingly mature electric vehicle technology, electric vehicles as a new travel tool are more and more accepted by the public, and the cross-regional and national sales of electric vehicles have become a common market phenomenon, and the export trade volume is getting higher and higher. As one of the various charging solutions for electric vehicles, the mode two charging gun is more and more recognized and selected for its convenience in home charging energy supplement in the actual popularization and application of electric vehicles. For example, the charging gun head with an indicator light display and the charging gun with the charging gun head in patent application No. 202222926675.1, which is composed of different colored inner and outer shells on the charging gun body, can increase the ornamental value of the charging gun head and attract users to use it.

[0003] Because the power supply end standard plug needs to match the local market household standard socket, in order to meet the use demand of the local market, electric vehicle manufacturers need to develop various mode two charging gun products with different standard plugs, resulting in higher cost investment for repeated development of products with the same function. At the same time, some market charging piles do not configure vehicle plugs, but only provide power sockets. In order to utilize such charging pile resources, electric vehicle manufacturers need to separately configure double-plug charging products for vehicles. In summary, the overall cost investment of electric vehicle charging products is relatively high.

[0004] In order to meet the market demand of different regions and countries, electric vehicle manufacturers need to develop mode two products with different standard plugs and conduct product authentication. In order to meet the functional demand of the same product, excessive resources are repeatedly invested to solve the problem, resulting in waste of resources (manpower and expenses, etc.). Some market areas do not configure vehicle plugs for charging piles, but only provide power sockets. If such charging pile resources are to be utilized, electric vehicles need to be additionally configured with double-plug charging products, resulting in higher overall vehicle cost investment.

[0005] In summary, the mode two charging gun of the prior art has insufficient compatibility and cannot meet the charging plugs corresponding to different power sources. UTILITY MODEL CONTENTS

[0006] The utility model aims at overcoming the deficiency of the prior art and providing a mode two charging gun supporting multiple power sources. The compatible charging control box is designed to realize at least two charging power sources of charging piles or standard plugs for the charging gun, improve the compatibility of the charging gun, reduce the repeated development of the charging gun product, and save costs.

[0007] In order to achieve the above object, the utility model adopts the technical scheme of a mode two charging gun supporting multiple power supplies, the charging gun includes a vehicle end part and a power supply end part, wherein the vehicle end part includes an alternating current vehicle plug, a cable control box and an adapter interface socket, and the power supply end part includes an adapter interface plug and a power supply plug.

[0008] The alternating current vehicle plug is used for connecting to a vehicle socket during charging, and the alternating current vehicle plug is connected with the cable control box.

[0009] The adapter interface plug is connected with the power supply plug, and the power supply plug is used for connecting a power supply.

[0010] A resistor R0 is arranged in the adapter interface plug, and after the adapter interface plug is inserted into the adapter interface socket, the cable control box identifies the type of the current power supply plug by reading the resistance value of the resistor R0 and performs charging protection and control through the cable control box.

[0011] A micro switch S0 is arranged in the adapter interface socket, and after the adapter interface plug is inserted into the adapter interface socket, the micro switch S0 is closed, otherwise the micro switch S0 is opened, and the cable control box is used for identifying the opening and closing state of the micro switch S0 to determine whether the current plug connection is normal to control the charging process.

[0012] A thermistor R is arranged in the adapter interface socket, and the cable control box collects temperature data of the intermediate adapter interface through the thermistor R and controls the charging process based on the temperature data.

[0013] The adapter interface plug and the adapter interface socket are connected in a plug-in manner, wherein the adapter interface socket has terminals L1, N, PE and CP terminals, and the adapter interface plug matched with the adapter interface socket has pins L1, N, PE and CP, the adapter interface socket has first category detection terminals and second category detection terminals, the first category detection terminals and the second category detection terminals are connected to control equipment of the cable control box respectively, and two pins are led out from both ends of the resistor R0 in the adapter interface plug for corresponding to the first category detection terminals and the second category detection terminals.

[0014] The pin L1, the pin N and the pin PE of the adapter interface plug are connected with the L1 terminal, the N terminal and the PE terminal of the power supply plug, when the power supply plug has a CP terminal, the power supply plug is a power supply plug, the CP terminal of the adapter interface socket is connected with the CP terminal of the power supply plug, otherwise the power supply plug is a mains plug, and the CP terminal of the adapter interface socket is suspended.

[0015] The cable control box comprises a control device, a switch K1, a switch K2, and a switch S, a switch S1 and a resistor R1; one end of the CP cable in the cable control box is connected to the CP terminal of the AC vehicle plug, and the other end is connected to the CP terminal of the adapter socket; one terminal of the CP cable in the cable control box is connected to the PWM port of the control device through the switch S, the resistor R1 and the switch S1 in sequence; and the control device is internally provided with a PWM module connected to the PWM port.

[0016] The cable control box is internally provided with a PE cable, an L1 cable and an N-phase cable.

[0017] The two ends of the PE cable are respectively connected to the PE terminal of the AC vehicle plug and the PE terminal of the adapter socket; the two ends of the L1 cable are respectively connected to the L1 terminal of the AC vehicle plug and the L1 terminal of the adapter socket; and the two ends of the N-phase cable are respectively connected to the N-phase terminal of the AC vehicle plug and the N-phase terminal of the adapter socket.

[0018] The L1 cable and the N-phase cable are respectively provided with a switch K1 and a switch K2 and a residual current protector RCD.

[0019] The output end of the control device is connected to the switches K1, K2 and S.

[0020] The charging gun of the utility model has the advantages that the charging control box is designed to be compatible, the charging gun is compatible with the power supply plug of the charging pile and the standard plug in the commercial power supply, the compatibility of the charging gun is improved, the repeated development of the charging gun product is reduced, and the cost is saved. BRIEF DESCRIPTION OF DRAWINGS

[0021] The contents expressed by each drawing in the specification of the utility model and the marks in the drawings are briefly described as follows:

[0022] Figure 1 The mode two charging gun principle diagram of the utility model is configured with the charging pile power supply plug;

[0023] Figure 2 The mode two charging gun principle diagram of the utility model is configured with the national standard plug.

[0024] The marks in the drawings are as follows: 1, AC vehicle plug; 2, cable control box; 3, adapter socket; 4, adapter plug; 5, power supply plug. DETAILED DESCRIPTION

[0025] The specific embodiments of the utility model are further described in detail by comparing the drawings and describing the optimal embodiments.

[0026] The scheme mainly solves the problem that the charging gun cannot meet the needs of various types of power supply, and designs a charging gun that can support various charging power supply types in support mode two charging. The various power supply types at least include standard plugs corresponding to alternating current power grids and power supply plugs corresponding to charging piles or charging stations, so as to realize a charging gun compatible with two charging modes and meet the use of users. The specific scheme is as follows:

[0027] As shown in Figure 1 , 2 A mode two charging gun supporting multiple power supplies, the charging gun includes a vehicle end part and a power supply end part; wherein the vehicle end part includes an alternating current vehicle plug, a cable control box and an adapter interface socket; the power supply end part includes an adapter interface plug and a power supply plug; the vehicle end part will not change, and the power supply end part can replace different power supply plugs and associated devices according to the power supply type, so as to realize the compatibility of the fixed and unchanged vehicle end part with different power supply end parts, reduce the cost expenditure, and at the same time, compatible with multiple power supply types.

[0028] The alternating current vehicle plug is used for connecting to a vehicle socket during charging, the alternating current vehicle plug is connected with the cable control box; the cable control box is connected with the adapter interface socket;

[0029] The adapter interface plug is connected with the power supply plug, and the power supply plug is used for connecting a power supply;

[0030] A resistor R0 is arranged in the adapter interface plug, after the adapter interface plug is inserted into the adapter interface socket, the cable control box identifies the current power supply plug type by reading the resistance value of the resistor R0 and executes charging protection and control through the cable control box. A micro switch S0 is arranged in the adapter interface socket, after the adapter interface plug is inserted into the adapter interface socket, the micro switch S0 is closed, otherwise the micro switch S0 is opened, and the cable control box is used for identifying the opening and closing state of the micro switch S0 to judge whether the current plug-in is normal to control the charging process.

[0031] A thermistor R is arranged in the adapter socket, and the cable control box acquires temperature data of the intermediate adapter through the thermistor R and controls the charging process based on the temperature data. The adapter plug and the adapter socket are connected in a plug-in manner; the adapter socket has terminals L1, N, PE and CP terminal; the adapter plug matched with the adapter socket has pins L1, N, PE and CP; the adapter socket has first category detection terminals and second category detection terminals, which are respectively connected to the control device of the cable control box; two pins are led out from both ends of the resistor R0 in the adapter plug for corresponding to the first category detection terminals and the second category detection terminals. The L1, N and PE of the adapter plug are connected with the L1, N and PE of the power plug; when the power plug has a CP terminal, it is a power supply plug, and the CP of the adapter socket is connected with the CP terminal of the power plug; otherwise, it is a standard plug in the mains, and the CP terminal of the adapter socket is suspended.

[0032] The cable control box includes a control device, switches K1 and K2, and switches S, S1 and resistor R1; one end of the CP cable in the cable control box is connected to the CP terminal of the AC vehicle plug, and the other end is connected to the CP terminal of the adapter socket; one terminal in the CP cable in the cable control box is connected to the PWM port of the control device through the switches S, R1 and S1 connected in series; the control device is built-in with a PWM module connected to the PWM port;

[0033] The cable control box is provided with PE cable, L1 cable and N-phase cable;

[0034] The two ends of the PE cable are respectively connected to the PE terminal of the AC vehicle plug and the PE terminal of the adapter socket; the two ends of the L1 cable are respectively connected to the L1 terminal of the AC vehicle plug and the L1 terminal of the adapter socket; the two ends of the N-phase cable are respectively connected to the N-phase terminal of the AC vehicle plug and the N-phase terminal of the adapter socket; the switches K1 and K2 and the residual current protector RCD are arranged in the L1 cable and the N-phase cable respectively; the output ends of the control device are respectively connected to the switches K1, K2 and S.

[0035] As shown in Figure 1 , 2 The two kinds of variable parts corresponding to the power supply of the charging pile type and the power supply of the city network alternating current type are respectively shown in the structural schematic diagram, which will be introduced one by one as follows:

[0036] The vehicle end part is a part with unchanged circuit structure, which has a compatible variable power supply end part. The circuit structure of the vehicle end part includes an AC vehicle plug, a cable control box and an adapter socket.

[0037] The AC vehicle plug is used to be inserted into the AC socket of the vehicle during charging, and the plug has L1, N, PE, CP, CC and other terminals; after being inserted into the vehicle, the L1, N, PE, CP, CC and other terminals of the vehicle charging socket are connected with the L1, N, PE, CP, CC terminals on the AC plug; the CC terminal is short-circuited to the PE terminal through a resistor RC; the L1, N, PE, CP and other terminals of the AC charging plug have a corresponding pin or socket, and are connected to the vehicle charging socket in the form of pin connection.

[0038] The cable control box includes a control device, L1, N, PE, CP cables, and an RCD protector, switches K1, K2, S, S1, and a resistor R1.

[0039] The adapter socket is provided with L1 terminals, N-phase terminals, PE terminals, and CP terminals.

[0040] One end of the L1 cable of the cable control box is connected to the L1 terminal of the AC vehicle plug, and the other end is connected to the L1 terminal of the adapter socket; one end of the N-phase cable of the cable control box is connected to the N-phase terminal of the AC vehicle plug, and the other end is connected to the N-phase terminal of the adapter socket; one end of the PE cable of the cable control box is connected to the PE terminal of the AC vehicle plug, and the other end is connected to the PE terminal of the adapter socket; one end of the CP cable of the cable control box is connected to the CP terminal of the AC vehicle plug, and the other end is connected to the CP terminal of the adapter socket.

[0041] The L1, N, CP, and PE terminals of the adapter socket are respectively connected to a plug-in terminal, which is used to be connected to the adapter plug in a plug-in manner to form a connection path between the corresponding terminals.

[0042] Switches K1 and K2 are respectively arranged in series in the L1 cable and the N-phase cable, and the output end of the control device of the cable control box is connected to the switches K1 and K2 to control the on-off of the switches K1 and K2; further, an RCD protector is arranged in the loop of the L1 cable and the N-phase cable to protect the charging safety. A connection terminal is arranged on the CP cable, which is connected to the PWM port of the control device through the switch S, the resistor R1, and the switch S1. The PWM port is connected to the built-in PWM module of the control device, which is used to interact with the vehicle when the power type is not able to perform charging current information and other information during charging, and to perform interactive charging control through the PWM module.

[0043] The thermistor R is arranged on the adapter socket, and two ends of the thermistor R are connected to two ports of the control device respectively to obtain information such as the resistance value of the thermistor R, and the charging process is controlled according to the temperature of the adapter socket collected by the thermistor, for example, the opening and closing of the switches K1 and K2 can be controlled according to the temperature. A micro switch S0 is arranged in the adapter socket, and the plugging state between the adapter socket and the adapter plug is detected or reflected through the micro switch S0. Two ends of the micro switch S0 are connected to two IO ports of the control device, and the closing and opening states of the micro switch S0 can be read through the two IO ports to determine whether the adapter socket and the adapter plug are plugged in place.

[0044] The adapter plug is provided with a resistor R0 with different resistance values according to different power types, and when the adapter plug and the socket are plugged together, the control device determines the type of the power plug at this time by reading the resistance value of the resistor R0. The adapter plug is provided with two pins corresponding to the positive and negative poles of the resistor R0, and the adapter socket is also provided with two corresponding pins or pin holes, and the two pins or pin holes are connected to the control device. After the adapter plug is inserted into the adapter socket, the pins at both ends of the resistor R0 are connected to the corresponding pins or pin holes of the adapter socket, so that the resistor R0 is connected to the two IO ports of the control device, and the control device can detect the resistance value of the resistor R0 by outputting a driving current or voltage, thereby determining the type of the charging power supply. The opening or closing of the switch S can be controlled according to the determination of the type of the charging power supply, so as to control whether the PWM module works.

[0045] In the present scheme, the adapter plug is connected to the power supply through the power plug; the power plug can be a power supply plug of a charging pile or a standard plug of a commercial power supply; each terminal of the power supply plug or the standard plug of the charging pile is connected to L1, N, PE and CP of the adapter plug to form a replaceable and adjustable part of the charging gun. If it is a standard plug, the CP terminal of the adapter socket is directly suspended, and if it is a charging pile, the CP interface needs to be connected together.

[0046] The working principle is introduced as follows:

[0047] The present scheme mainly comprises an AC vehicle plug 1, a cable control box 2, an adapter socket 3, an adapter plug 4 and a power plug 5. The power plug includes two types: a power supply plug and a standard plug, as shown in Figure 1 , 2 , Figure 1 The charging plug of the charging pile is a power supply plug; Figure 2 The charging plug of the charging pile is a standard plug.

[0048] Among them, the intermediate adapter interface is composed of the adapter socket 3 and the adapter plug 4; the AC vehicle plug, the power supply plug and the standard plug are standard parts in line with regulations, which are not changed in this scheme; the power supply input end part of the cable control box is adjusted from the common non-detachable (cable leading into the box PCB fixed connection) to the detachable intermediate adapter interface scheme (3, 4), and the adapter socket 3 is configured with a thermistor R, a locking switch S0 for auxiliary detection of plug-in state, pins A and B of a power plug type identification resistor R0, power pins L1 and N, ground pins PE and charging control pins CP, each pin can be configured with a jack or a pin; the adapter plug 4 is configured with a power plug type identification resistor R0, pins A and B connected by a resistor RO, power pins L1 and N, ground pins PE and charging control pins CP, each pin is configured with a pin or a jack; the AC vehicle plug, the cable control box and the adapter socket form the mode two charging gun vehicle end part, the adapter plug is respectively connected with the power supply plug or the standard plug to form the mode two charging gun power supply end part, and the mode two charging gun vehicle end part and the power supply end part form a complete integrated mode two charging gun product.

[0049] When the adapter plug is inserted into the adapter socket, the detection lock switch S0 in the adapter socket changes from open to closed, and is in a normally closed state during use. When the power supply plug or the standard plug is connected to the power supply part of the power supply end, the AC vehicle plug is connected to the vehicle socket, and the power supply end is in a power supply state, the control device in the cable control box can detect the specific resistance value of R0, and determine that the connected power supply end part is a power supply plug or a standard plug according to the resistance value. If it is a power supply plug, the control device in the cable control box controls the switch S to change from closed to open, and the PWM module in the cable control box no longer participates in the subsequent charging process, and the control switch K1 / K2 changes from open to closed, and the vehicle charges through the CP loop and the charging pile to exchange charging information and start charging. In the charging process, the thermistor R is responsible for detecting the temperature of the intermediate adapter, and when the temperature is too high, the cable control box controls the switches K1 and K2 to change from closed to open, and stops charging; when the cable control box identifies that the detection lock switch S0 is in an open state, if it is before charging, the switches K1 / K2 remain open, and if it is in the charging process, the switches K1 / K2 are adjusted from the closed state to the open state. If it is a standard plug, the switch S remains closed and no longer opens, and the PWM module in the cable control box participates in the charging interaction, and the thermistor R functions as above, and the switches K1 / K2 are closed according to the demand, in addition to the normal mode two charging gun protection function, when the cable control box identifies that the detection lock switch S0 is in an open state, if it is before charging, the switches K1 / K2 remain open, and if it is in the charging process, the switches K1 / K2 are adjusted from the closed state to the open state. At the same time, the power plug type identification resistance R0 can be defined with multiple values to distinguish the power supply plug and the standard plug in different market regions or countries. The adapter socket can be physically integrated with the cable control box shell, and the adapter plug can be physically integrated with the power supply end part power plug, and they can also be connected together through a cable.

[0050] The intermediate adapter scheme converts the mode two charging gun into a double-head gun scheme, reduces the configuration types and overall cost investment of the whole vehicle charging conduction connection product, and can more widely utilize the local charging pile (only configured with a power supply socket and without a vehicle plug) resources; the introduction of the intermediate adapter scheme can reduce the repeated development, part mold and certification test cost and time investment of the mode two charging gun due to different market regions and national standard plugs; the integrated development of the intermediate adapter scheme can solve the charging configuration of two different schemes with one main product, which can effectively reduce the charging product configuration and development, thereby reducing the whole vehicle cost and optimizing the customer charging experience.

[0051] The characteristics of the scheme include: by adjusting the mode two power supply end part and the cable control box inseparable conventional scheme to connect the power supply end part and the vehicle end part through the intermediate adapter scheme, and increasing the identification power plug model identification resistance R0 and CP loop control switch S, the mode two charging gun product of the conventional configuration single standard plug is optimized as the mode two charging gun product compatible with various market regions and national standard plugs, and the mode two charging gun product can also be optimized as a double-head gun product compatible with power supply plugs in multiple market regions and countries, and the intermediate adapter integrates a thermistor R and a switch S0, and the state of the switch K1 / K2 is controlled to be closed or opened to ensure that the intermediate adapter is in a safe working state. Based on this product design logic, the vehicle end interface can also be optimized as an intermediate adapter scheme to compatible with different standard AC vehicle plug schemes. The power supply end part of the mode two charging gun product is adjusted from an inseparable structure to a detachable intermediate adapter structure, and the intermediate adapter can be used as a standard interface to connect the vehicle end part and the power supply end part as a whole, and the standardized interface can reduce the types of adapter development, and further realize the change of the conventional mode two charging gun from a single standard part to two or three standard parts connected by a standard intermediate adapter. The end user can purchase and use the matching combination according to the actual demand and replace the local maintenance; the adapter socket structure is integrated with the original cable control box structure, and the detection locking switch S0 of whether the intermediate adapter plug is assembled in place, the thermistor R for detecting the interface temperature during the charging process of the intermediate adapter, the pins A / B of the identification resistance R0 for identifying the plug type and standard of the power supply part, and the pins for connecting L1 / N / PE / CP; the adapter plug integrates the resistance RO for representing the power supply plug and the standard plug type and standard, and integrates the pins A / B for connecting the cable control box, and the pins for connecting L1 / N / PE / CP (as needed).

[0052] On the cable control box, a switch S is added in the CP loop, and a CP branch is added between the switch S and the AC plug end and connected externally through the intermediate adapter; the cable control box identifies the state (closed or opened) of the switch S0 to identify the state (closed or opened) of the switch K1 / K2; the cable control box identifies the value of the resistance R0 to identify the model of the power supply plug to control the switch S to be closed or opened; and the cable control box identifies the value of the thermistor R to control whether the switch K1 / K2 is opened.

[0053] Obviously, the specific implementation of the present application is not limited by the above-mentioned manner, and various non-essential improvements made by adopting the method concept and technical scheme of the present application are within the protection scope of the present application.

Claims

1. A mode 2 charging gun supporting multiple power sources, characterized in that: The charging gun comprises a vehicle end part and a power supply end part; wherein the vehicle end part comprises an AC vehicle plug, a cable control box and an adapter interface socket; the power supply end part comprises an adapter interface plug and a power supply plug; The AC vehicle plug is used for connecting to a vehicle socket during charging, and the AC vehicle plug is connected with the cable control box; the cable control box is connected with the adapter interface socket; The adapter interface plug is connected with the power supply plug, and the power supply plug is used for connecting a power supply; A resistor R0 is arranged in the adapter interface plug, and after the adapter interface plug is inserted into the adapter interface socket, the cable control box identifies the current power supply plug type by reading the resistance value of the resistor R0 and performs charging protection and control through the cable control box.

2. The mode 2 charging gun supporting multiple power sources of claim 1, wherein: A micro switch S0 is arranged in the adapter interface socket, and after the adapter interface plug is inserted into the adapter interface socket, the micro switch S0 is closed, otherwise the micro switch S0 is opened, and the cable control box is used to identify the opening and closing state of the micro switch S0 to judge whether the current plug connection is normal to control the charging process.

3. A mode 2 charging gun supporting multiple power sources as claimed in claim 2, wherein: A thermistor R is arranged in the adapter interface socket, and the cable control box collects temperature data of the intermediate adapter interface through the thermistor R and controls the charging process based on the temperature data.

4. The mode 2 charging gun supporting multiple power sources of claim 3, wherein: The adapter interface plug and the adapter interface socket are connected in a plug-in manner; wherein the adapter interface socket has terminals L1, N, PE and CP terminals; the adapter interface plug matched with the adapter interface socket has pins L1, N, PE and CP; the adapter interface socket has first category detection terminals and second category detection terminals, and the first category detection terminals and the second category detection terminals are respectively connected to control devices in the cable control box; two pins are led out from both ends of the resistor R0 in the adapter interface plug for corresponding to the first category detection terminals and the second category detection terminals.

5. A mode 2 charging gun supporting multiple power sources as claimed in claim 4, wherein: The pins L1, N and PE of the adapter interface plug are connected with the L1 terminal, the N terminal and the PE terminal of the power supply plug; when the power supply plug has a CP terminal, it is a power supply plug, the CP terminal of the adapter interface socket is connected with the CP terminal of the power supply plug, otherwise it is a mains plug, and the CP terminal of the adapter interface socket is suspended.

6. A mode 2 charging gun supporting multiple power sources as claimed in claim 4, wherein: The cable control box comprises control devices, switches K1 and K2, and switches S and S1 and a resistor R1; one end of a CP cable in the cable control box is connected to the CP terminal of the AC vehicle plug, and the other end is connected to the CP terminal of the adapter interface socket; one terminal in the CP cable in the cable control box is connected to the PWM port of the control device through the switches S, the resistor R1 and the switch S1 in sequence, and the control device is built-in with a PWM module connected to the PWM port; The cable control box is provided with a PE cable, an L1 cable and an N phase cable; wherein the two ends of the PE cable are respectively connected to the PE terminal of the AC vehicle plug and the PE terminal of the adapter interface socket; the two ends of the L1 cable are respectively connected to the L1 terminal of the AC vehicle plug and the L1 terminal of the adapter interface socket; and the two ends of the N phase cable are respectively connected to the N phase terminal of the AC vehicle plug and the N phase terminal of the adapter interface socket. Switches K1, K2 and a residual current protector RCD are arranged in the L1 cable and the N phase cable respectively; The output ends of the control device are connected to the switches K1, K2 and S respectively.

Images