New energy vehicle daily standard V2L alternating current charging and discharging system and method thereof

Abstract

The invention discloses a new energy automobile daily mark V2L alternating current charging and discharging system which comprises a bidirectional vehicle-mounted inverter charger charging and discharging connection confirmation circuit, a V2L daily mark discharging connection confirmation circuit, a daily mark alternating current charging connection confirmation circuit, an alternating current discharging socket used for being connected with a load and an alternating current charging plug used for being connected with an external power grid. And the V2L daily mark discharging connection confirmation circuit and the daily mark alternating current charging connection confirmation circuit are respectively connected with a bidirectional vehicle-mounted inverter charger charging and discharging connection confirmation circuit of the vehicle. The invention further discloses a new energy vehicle daily standard V2L alternating current charging and discharging method. The communication protocol of the two-way vehicle-mounted inverter charger and the vehicle is reset, the charging and discharging intention and the connection state of the charging and discharging system can be recognized in time, equipment in the vehicle can be awakened under the condition that an EVCC conversion module is not added, the charging and discharging function of the daily standard vehicle is achieved, the production cost and the maintenance cost are saved, and the charging and discharging efficiency is improved. And popularization of the charging and discharging function of the daily-standard new energy vehicle is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of automotive electronic technology, and in particular to a new energy vehicle Japanese standard V2L AC charging and discharging system and method thereof. Background Art

[0002] Thanks to the increasing cruising range of electric vehicles and the development of on-board bidirectional chargers, it has become a trend for many electric vehicles to provide external discharge functions; V2L (Vehicle to Load) refers to a technology in which vehicles with on-board power batteries convert battery power into AC power to supply power to external devices, such as household appliances or other devices. This technology can support temporary power needs, such as camping, emergency backup power, etc., and improve the versatility and practicality of electric vehicles. By implementing V2L technology, electric vehicles can not only be used as a means of transportation, but also as a mobile energy supply. Domestic charging and discharging technologies are also becoming more and more mature and are being introduced to the market, but Japanese-standard vehicles need to add EVCC modules to wake up the in-vehicle equipment to realize the charging and discharging functions, which leads to an increase in production and maintenance costs, which is not conducive to the promotion of Japanese-standard new energy vehicles charging and discharging functions. Summary of the invention

[0003] The purpose of the present invention is to provide a new energy vehicle Japanese standard V2L AC charging and discharging system and method thereof, which can wake up the in-vehicle equipment without adding an EVCC conversion module and realize the charging and discharging function of the Japanese standard vehicle, so as to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A new energy vehicle Japanese standard V2L AC charging and discharging system, comprising:

[0006] Bidirectional vehicle inverter charger charging and discharging connection confirmation circuit;

[0007] A V2L Japanese standard discharge connection confirmation circuit, wherein the V2L Japanese standard discharge connection confirmation circuit is connected to a charge and discharge connection confirmation circuit of a bidirectional on-board inverter charger of the vehicle;

[0008] A Japanese standard AC charging connection confirmation circuit, which is connected to a charging and discharging connection confirmation circuit of a bidirectional on-board inverter charger of a vehicle;

[0009] An AC discharge socket for connecting a load, wherein the AC discharge socket is connected to a charging and discharging connection confirmation circuit of a bidirectional on-board inverter charger of the vehicle through a control switch;

[0010] An AC charging plug for connecting to an external power grid, wherein the AC charging plug is connected to a charging and discharging connection confirmation circuit of a bidirectional on-board inverter charger of a vehicle through a control switch.

[0011] Preferably, the V2L Japanese standard discharge connection confirmation circuit comprises: a discharge socket, a discharge strip, a discharge circuit live wire end, a discharge circuit neutral wire end and a discharge circuit neutral wire grounding end; wherein the discharge socket live wire end is connected to the discharge strip live wire end through a control switch and a fuse on the discharge strip, the discharge socket neutral wire end is directly connected to the discharge strip neutral wire end, and the discharge socket grounding end is directly connected to the discharge strip grounding end;

[0012] Preferably, a group of working indicator light circuits are connected in parallel with the neutral line end at the rear end of the live line control switch on the discharge socket, and the working indicator light circuit includes: a D1 diode, a red LEDI light-emitting diode, and a 150 ohm resistor, and the electronic components of the working indicator light circuit are connected in series.

[0013] Preferably, the Japanese standard AC charging connection confirmation circuit includes: a Japanese standard charging plug, a pilot circuit control board, an external power grid charging plug, a live wire end of a charging circuit, a neutral wire end of a charging circuit, and a neutral wire grounding end of a charging circuit; wherein the live wire end of the charging circuit controls the disconnection and closing of the live wire through a control switch K1 in the pilot circuit control board, the neutral wire end of the charging circuit controls the disconnection and closing of the neutral wire through a control switch K2 in the pilot circuit control board, and the neutral wire grounding end of the charging circuit is directly connected in the pilot circuit control board.

[0014] Preferably, the control end of the control switch K1 in the guiding circuit control board is controlled by the power supply control device in the guiding circuit control board, and the control end of the control switch K2 in the guiding circuit control board is controlled by the power supply control device in the guiding circuit control board.

[0015] Preferably, the bidirectional on-board inverter charger charging and discharging connection confirmation circuit includes: a bidirectional on-board inverter charger, a vehicle AC socket, a live wire end of a charging and discharging circuit, a neutral wire end of a charging and discharging circuit, and a neutral wire grounding end of a charging and discharging circuit; wherein, the live wire end of the charging and discharging circuit is connected to the live wire end of the bidirectional on-board inverter charger through the live wire end of the vehicle AC socket, the neutral wire end of the charging and discharging circuit is connected to the neutral wire end of the bidirectional on-board inverter charger through the neutral wire end of the vehicle AC socket, and the grounding end of the charging and discharging circuit is connected to the grounding end of the bidirectional on-board inverter charger through the grounding end of the vehicle AC socket.

[0016] Preferably, the discharge socket comprises:

[0017] Resistor R8, one end of which is connected to resistor R9, and the other end of which is connected to the CS signal line in the discharge socket;

[0018] Resistor R9, one end of which is connected to resistor R8, and the other end is connected to the ground wire PE in the discharge socket;

[0019] R10 resistor, one end of which is connected to one end of the R9 unlocking switch, and the other end is connected to the CS signal line in the discharge socket;

[0020] Discharge switch, normally open switch, short-circuit the R10 resistor at both ends;

[0021] The unlocking switch is a normally closed switch, one end of which is connected to the resistor R10, and the other end is connected between the resistor R8 and the resistor R9.

[0022] Preferably, the Japanese standard charging plug includes:

[0023] One end of the R6 resistor is connected to the R7 resistor, and the other end is connected to the CS signal line of the Japanese standard charging plug;

[0024] One end of the resistor R7 is connected to the resistor R6, and the other end is connected to the PE ground wire of the Japanese standard charging plug;

[0025] The S3 switch is a normally closed switch connected across the R7 resistor to short-circuit the R7 resistor.

[0026] Preferably, the bidirectional vehicle-mounted inverter charger includes: a CP detection circuit, a CS detection circuit, a charging and discharging live wire, a charging and discharging neutral wire, and a charging and discharging ground wire; wherein, the bidirectional vehicle-mounted inverter charger is awakened by the CP and CS detection circuits, and when it matches the discharge process detection conditions, the bidirectional vehicle-mounted inverter charger enters the discharge process; when it matches the charging process detection conditions, the bidirectional vehicle-mounted inverter charger enters the charging process, and the rest of the time, the bidirectional vehicle-mounted inverter charger enters a standby sleep state.

[0027] A new energy vehicle Japanese standard V2L AC charging and discharging method, comprising:

[0028] The bidirectional vehicle inverter charger is awakened by detecting the CS resistance value on the discharge socket on the V2L Japanese standard discharge connection confirmation circuit or the CP and CS signals on the Japanese standard charging plug on the Japanese standard AC charging connection confirmation circuit;

[0029] The bidirectional vehicle inverter charger determines the connection status of the discharge socket 4 or the Japanese standard charging plug 6 with the vehicle by detecting the CS resistance value on the discharge socket on the V2L Japanese standard discharge connection confirmation circuit or the CP and CS signals on the Japanese standard charging plug on the Japanese standard AC charging connection confirmation circuit;

[0030] The bidirectional on-board inverter charger determines whether to enter the discharge process or the AC charging process by detecting the CS resistance value on the discharge socket on the V2L Japanese standard discharge connection confirmation circuit or the CP duty cycle signal or CS resistance value on the Japanese standard charging plug on the Japanese standard AC charging connection confirmation circuit.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The technical solution of the present invention adjusts the wake-up signal and the detection signal of the Japanese standard V2L discharge connection confirmation circuit and the Japanese standard AC charging connection confirmation circuit from the EVCC conversion module to the bidirectional on-board inverter charger, and resets the communication protocol between the bidirectional on-board inverter charger and the vehicle. It can timely identify the user's charging and discharging intentions and the connection status of the charging and discharging system, so that without adding an EVCC conversion module, it can wake up the in-vehicle equipment and realize the charging and discharging function of the Japanese standard vehicle, saving production costs and maintenance costs, which is conducive to the promotion of the charging and discharging function of Japanese standard new energy vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the connection of the charging circuit of the present invention;

[0034] Figure 2 It is a schematic diagram of the discharge circuit connection of the present invention.

[0035] In the figure: 1. Vehicle; 2. Vehicle AC socket; 3. Discharge socket strip; 4. Discharge socket; 6. Japanese standard charging plug; 7. Guidance circuit control board; 8. External grid charging plug; 10. Bidirectional inverter OBC; 11. BMS. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figure 1 and Figure 2The present invention provides a new energy vehicle Japanese standard V2L AC charging and discharging system, including a bidirectional on-board inverter charger charging and discharging connection confirmation circuit, a V2L Japanese standard discharge connection confirmation circuit, a Japanese standard AC charging connection confirmation circuit, an AC discharge socket for connecting a load, and an AC charging plug for connecting an external power grid; the V2L Japanese standard discharge connection confirmation circuit is connected to the bidirectional on-board inverter charger charging and discharging connection confirmation circuit of vehicle 1, the Japanese standard AC charging connection confirmation circuit is connected to the bidirectional on-board inverter charger charging and discharging connection confirmation circuit of vehicle 1, the AC discharge socket is connected to the bidirectional on-board inverter charger charging and discharging connection confirmation circuit of vehicle 1 through a control switch, and the AC charging plug is connected to the bidirectional on-board inverter charger charging and discharging connection confirmation circuit of vehicle 1 through a control switch.

[0039] Furthermore, the V2L Japanese standard discharge connection confirmation circuit includes: a discharge socket 4, a discharge socket 3, a discharge circuit live wire end, a discharge circuit neutral wire end and a discharge circuit neutral wire grounding end; wherein the discharge socket 4 live wire end is connected to the discharge socket 3 live wire end through a control switch and a fuse on the discharge socket 3, the discharge socket 4 neutral wire end is directly connected to the neutral wire end on the discharge socket 3, and the discharge socket 4 grounding end is directly connected to the grounding end on the discharge socket 3;

[0040] Among them, a group of working indicator light circuits are connected in parallel with the neutral line end at the rear end of the live line control switch on the discharge socket 3, and the working indicator light circuit includes: a D1 diode, a red LEDI light-emitting diode, and a 150 ohm resistor. The electronic components of the working indicator light circuit are in series relationship;

[0041] The discharge socket 4 comprises:

[0042] Resistor R8, one end of which is connected to resistor R9, and the other end of which is connected to the CS signal line in the discharge socket 4;

[0043] Resistor R9, one end of which is connected to resistor R8, and the other end of which is connected to the ground wire PE in the discharge socket 4;

[0044] The resistor R10 has one end connected to one end of the unlocking switch R9 and one end connected to the CS signal line in the discharge socket 4;

[0045] Discharge switch, normally open switch, short-circuit the R10 resistor at both ends;

[0046] The unlocking switch is a normally closed switch, one end of which is connected to the resistor R10, and the other end is connected between the resistor R8 and the resistor R9.

[0047] Furthermore, the Japanese standard AC charging connection confirmation circuit includes: a Japanese standard charging plug 6, a pilot circuit control board 7, an external power grid charging plug 8, a live wire end of a charging circuit, a neutral wire end of a charging circuit, and a neutral wire grounding end of a charging circuit; wherein the live wire end of the charging circuit controls the disconnection and closing of the live wire through a control switch K1 in the pilot circuit control board 7, the neutral wire end of the charging circuit controls the disconnection and closing of the neutral wire through a control switch K2 in the pilot circuit control board 7, and the neutral wire grounding end of the charging circuit is directly connected in the pilot circuit control board 7;

[0048] Wherein, the Japanese standard charging plug 6 includes:

[0049] One end of the resistor R6 is connected to the resistor R7, and the other end is connected to the 6CS signal line of the Japanese standard charging plug;

[0050] One end of the R7 resistor is connected to the R6 resistor, and the other end is connected to the 6PE grounding wire of the Japanese standard charging plug;

[0051] Switch S3, a normally closed switch, is connected across resistor R7 to short-circuit the resistor R7;

[0052] The control end of the control switch K1 in the guiding circuit control board 7 is controlled by the power supply control device in the guiding circuit control board 7 , and the control end of the control switch K2 in the guiding circuit control board 7 is controlled by the power supply control device in the guiding circuit control board 7 .

[0053] Further, the bidirectional on-board inverter charger charge and discharge connection confirmation circuit includes: a bidirectional on-board inverter charger 10, a vehicle AC socket 2, a live wire end of a charge and discharge circuit, a neutral wire end of a charge and discharge circuit, and a neutral wire grounding end of a charge and discharge circuit; wherein the live wire end of the charge and discharge circuit is connected to the live wire end of the bidirectional on-board inverter charger 10 through the live wire end of the vehicle AC socket 2, the neutral wire end of the charge and discharge circuit is connected to the neutral wire end of the bidirectional on-board inverter charger 10 through the neutral wire end of the vehicle AC socket 2, and the grounding end of the charge and discharge circuit is connected to the grounding end of the bidirectional on-board inverter charger 10 through the grounding end of the vehicle AC socket 2;

[0054] The bidirectional vehicle-mounted inverter charger 10 includes: a CP detection circuit, a CS detection circuit, a charging and discharging live wire, a charging and discharging neutral wire, and a charging and discharging ground wire; wherein, the bidirectional vehicle-mounted inverter charger 10 is awakened by the CP and CS detection circuits, and when it matches the discharge process detection condition, the bidirectional vehicle-mounted inverter charger 10 enters the discharge process; when it matches the charging process detection condition, the bidirectional vehicle-mounted inverter charger 10 enters the charging process, and at other times, the bidirectional vehicle-mounted inverter charger 10 enters a standby dormant state.

[0055] Furthermore, after the pilot circuit control board 7 is connected to the vehicle AC socket 2 through the Japanese standard AC charging connection confirmation circuit, the switch K1 and the switch K2 are closed by detecting that the signal of the CP control circuit on the Japanese standard charging plug 6 matches the preset value;

[0056] A new energy vehicle Japanese standard V2L AC charging and discharging method, comprising:

[0057] The bidirectional vehicle inverter charger 10 is awakened by detecting the CS resistance value on the discharge socket 4 on the V2L Japanese standard discharge connection confirmation circuit or the CP and CS signals on the Japanese standard charging plug 6 on the Japanese standard AC charging connection confirmation circuit;

[0058] The bidirectional vehicle inverter charger 10 determines the connection status of the discharge socket 4 or the Japanese standard charging plug 6 with the vehicle by detecting the CS resistance value on the discharge socket 4 on the V2L Japanese standard discharge connection confirmation circuit or the CP and CS signals on the Japanese standard charging plug 6 on the Japanese standard AC charging connection confirmation circuit;

[0059] The bidirectional vehicle inverter charger 10 determines whether to enter the discharge process or the AC charging process by detecting the CS resistance value on the discharge socket 4 on the V2L Japanese standard discharge connection confirmation circuit or the CP duty cycle signal or CS resistance value on the Japanese standard charging plug 6 on the Japanese standard AC charging connection confirmation circuit.

[0060] Specifically, first, when the bidirectional vehicle-mounted inverter charger 10 detects that the CP duty cycle and the PP resistance value match the preset value, the bidirectional vehicle-mounted inverter charger 10 is awakened and outputs the A+ voltage at the same time; when the bidirectional vehicle-mounted inverter charger 10 detects that the CS resistance value matches the preset value at the same time, it confirms that the charging plug is fully connected, closes the AC charging socket electronic lock, and reports the self-test status at the same time; secondly, the duty cycle status, charging plug connection status and resistance value are broadcasted through messages at the same time;

[0061] Secondly, the BMS11 is awakened by detecting the A+ voltage, and at the same time detects the message plug status and starts self-test; and according to the connection identification bit (00 not connected; 01 charging connected; 10 discharging connected; 11 invalid) reported by the bidirectional on-board inverter charger 10, it is judged that the vehicle 1 is in a discharge demand state or a charging demand state, and at the same time, the charger discharge enable or charger start enable is sent to the bidirectional on-board inverter charger 10 according to the vehicle status; wherein, the bidirectional on-board inverter charger 10 enters the discharge process or the charging process by detecting the enable state sent by the BMS11.

[0062] Specific charging process: As shown in Figure 1, the Japanese standard AC charging connection confirmation circuit of the present invention is connected to the vehicle AC socket 2; the power supply control device in the pilot circuit control board 7 detects that the signal of the CP control circuit on the Japanese standard charging plug matches the preset value, and closes the switch K1 and the switch K2; the bidirectional vehicle-mounted inverter charger 10 detects that the CP duty cycle (66.67%) and the CS resistance value (150Ω) match the preset value, and the bidirectional vehicle-mounted inverter charger 10 is awakened and outputs the A+ voltage at the same time; the bidirectional vehicle-mounted inverter charger 10 also detects that the CS resistance value matches the preset value, confirms that the Japanese standard charging plug 6 is in a fully connected state, closes the AC charging socket electronic lock, and reports the self-test state at the same time; secondly, the duty cycle state, the Japanese standard charging plug 6 are broadcast through the message at the same time. The connection status and resistance value of the charging plug 6 are detected; the BMS11 is awakened by detecting the A+ voltage, and at the same time detects the status of the message plug, and starts self-test, and according to the connection identification bit (01 charging connection) reported by the bidirectional on-board inverter charger 10, it is judged that the vehicle 1 is in a charging demand state; the BMS11 sends the charger startup enable to the bidirectional on-board inverter charger 10, and closes the total negative contactor; wherein, the bidirectional on-board inverter charger 10 detects the startup enable status sent by the BMS11, and at the same time detects the 220V voltage or 100V voltage on the AC side of the charger front end, and detects that the charger rear end voltage is consistent with the voltage reported by the BMS11, the bidirectional on-board inverter charger 10 enters the charging process, and the vehicle 1 starts charging;

[0063] Specific discharge process: As shown in Figure 2, after the V2L Japanese standard discharge connection confirmation circuit of the present invention is connected to the bidirectional on-board inverter charger charge and discharge connection confirmation circuit of the vehicle 1, by pressing the discharge button switch for 3S, the bidirectional on-board inverter charger 10 detects the resistance value through the CS end monitoring point 2, and the charger is awakened and outputs A+ voltage at the same time; after the bidirectional on-board inverter charger 10 detects that the resistance value of the CS end monitoring point 2 changes from 39Ω (3S) to 84.6Ω, the electronic lock is closed, and the discharge connection is entered by default, and the front-end voltage of the charger is detected at the same time, and the self-test status is reported through the message, and the charging plug connection status and Resistance value; wherein, the BMS11 is awakened by detecting the A+ voltage, and at the same time detects the status of the message plug and starts self-test; and according to the charging identification status (10 discharge connection) reported by the bidirectional on-board inverter charger 10, it is judged that the vehicle 1 is in a discharge demand state; the BMS11 sends the charger discharge enable to the bidirectional on-board inverter charger 10, and closes the total negative relay at the same time; when the bidirectional on-board inverter charger 10 detects that the front-end voltage of the charger is consistent with the voltage reported by the BMS11, the bidirectional on-board inverter charger 10 enters the inverter process; the discharge socket 3 presses the button switch on the socket to output 220VAC voltage.

[0064] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new energy vehicle Japanese standard V2L AC charging and discharging system, characterized in that: include: Bidirectional vehicle inverter charger charging and discharging connection confirmation circuit; A V2L Japanese standard discharge connection confirmation circuit, the V2L Japanese standard discharge connection confirmation circuit being connected to a bidirectional on-board inverter charger charge and discharge connection confirmation circuit of the vehicle (1); A Japanese standard AC charging connection confirmation circuit, the Japanese standard AC charging connection confirmation circuit being connected to a bidirectional on-board inverter charger charging and discharging connection confirmation circuit of the vehicle (1); An AC discharge socket for connecting a load, the AC discharge socket being connected to a charging and discharging connection confirmation circuit of a bidirectional on-board inverter charger of a vehicle (1) through a control switch; An AC charging plug for connecting to an external power grid, the AC charging plug being connected to a charging and discharging connection confirmation circuit of a bidirectional on-board inverter charger of a vehicle (1) through a control switch.

2. A Japanese standard V2L AC charging and discharging system for new energy vehicles according to claim 1, characterized in that: The V2L Japanese standard discharge connection confirmation circuit comprises: a discharge socket (4), a discharge socket strip (3), a discharge circuit live wire end, a discharge circuit neutral wire end and a discharge circuit neutral wire grounding end; wherein the live wire end of the discharge socket (4) is connected to the live wire end of the discharge socket strip (3) via a control switch and a fuse on the discharge socket strip (3), the neutral wire end of the discharge socket (4) is directly connected to the neutral wire end on the discharge socket strip (3), and the grounding end of the discharge socket (4) is directly connected to the grounding end on the discharge socket strip (3).

3. A new energy vehicle Japanese standard V2L AC charging and discharging system according to claim 2, characterized in that: A set of working indicator light circuits are connected in parallel with the neutral line end at the rear end of the live line control switch on the discharge socket (3), wherein the working indicator light circuit comprises: a D1 diode, a red LEDI light emitting diode, and a 150 ohm resistor, and the electronic components of the working indicator light circuit are connected in series.

4. A Japanese standard V2L AC charging and discharging system for new energy vehicles according to claim 1, characterized in that: The Japanese standard AC charging connection confirmation circuit comprises: a Japanese standard charging plug (6), a pilot circuit control board (7), an external power grid charging plug (8), a live wire end of a charging circuit, a neutral wire end of a charging circuit and a neutral wire grounding end of a charging circuit; wherein the live wire end of the charging circuit controls the disconnection and closing of the live wire through a control switch K1 in the pilot circuit control board (7), the neutral wire end of the charging circuit controls the disconnection and closing of the neutral wire through a control switch K2 in the pilot circuit control board (7), and the neutral wire grounding end of the charging circuit is directly connected in the pilot circuit control board (7).

5. A Japanese standard V2L AC charging and discharging system for new energy vehicles according to claim 4, characterized in that: The control end of the control switch K1 in the guiding circuit control board (7) is controlled by the power supply control device in the guiding circuit control board (7), and the control end of the control switch K2 in the guiding circuit control board (7) is controlled by the power supply control device in the guiding circuit control board (7).

6. A Japanese standard V2L AC charging and discharging system for new energy vehicles according to claim 1, characterized in that: The bidirectional on-board inverter charger charge and discharge connection confirmation circuit comprises: a bidirectional on-board inverter charger (10), a vehicle AC socket (2), a live wire end of a charge and discharge circuit, a neutral wire end of a charge and discharge circuit, and a neutral wire grounding end of the charge and discharge circuit; wherein the live wire end of the charge and discharge circuit is connected to the live wire end of the bidirectional on-board inverter charger (10) via the live wire end of the vehicle AC socket (2), the neutral wire end of the charge and discharge circuit is connected to the neutral wire end of the bidirectional on-board inverter charger (10) via the neutral wire end of the vehicle AC socket (2), and the grounding end of the charge and discharge circuit is connected to the grounding end of the bidirectional on-board inverter charger (10) via the grounding end of the vehicle AC socket (2).

7. A Japanese standard V2L AC charging and discharging system for new energy vehicles according to claim 2, characterized in that: The discharge socket (4) comprises: A resistor R8, one end of which is connected to the resistor R9, and the other end of which is connected to the CS signal line in the discharge socket (4); A resistor R9, one end of which is connected to the resistor R8, and the other end of which is connected to the ground wire PE in the discharge socket (4); A resistor R10, one end of which is connected to one end of the unlocking switch R9, and the other end of which is connected to the CS signal line in the discharge socket (4); Discharge switch, normally open switch, short-circuit the R10 resistor at both ends; The unlocking switch is a normally closed switch, one end of which is connected to the resistor R10, and the other end is connected between the resistor R8 and the resistor R9.

8. A Japanese standard V2L AC charging and discharging system for new energy vehicles according to claim 4, characterized in that: The Japanese standard charging plug (6) comprises: Resistor R6, one end of which is connected to resistor R7, and the other end of which is connected to the CS signal line of the Japanese standard charging plug (6); Resistor R7, one end of which is connected to resistor R6, and the other end of which is connected to the PE grounding wire of the Japanese standard charging plug (6); The S3 switch is a normally closed switch connected across the R7 resistor to short-circuit the R7 resistor.

9. A Japanese standard V2L AC charging and discharging system for new energy vehicles according to claim 6, characterized in that: The bidirectional on-board inverter charger (10) comprises: a CP detection circuit, a CS detection circuit, a charging and discharging live wire, a charging and discharging neutral wire, and a charging and discharging ground wire; wherein the bidirectional on-board inverter charger (10) is awakened by the CP and CS detection circuits, and when the discharge process detection condition is matched, the bidirectional on-board inverter charger (10) enters the discharge process; when the charging process detection condition is matched, the bidirectional on-board inverter charger (10) enters the charging process, and at other times, the bidirectional on-board inverter charger (10) enters a standby dormant state.

10. A new energy vehicle Japanese standard V2L AC charging and discharging method, characterized in that: include: The bidirectional vehicle-mounted inverter charger (10) is awakened by detecting the CS resistance value on the discharge socket (4) on the V2L Japanese standard discharge connection confirmation circuit or the CP and CS signals on the Japanese standard charging plug (6) on the Japanese standard AC charging connection confirmation circuit; The bidirectional vehicle-mounted inverter charger (10) determines the connection status of the discharge socket (4) or the Japanese standard charging plug (6) with the vehicle by detecting the CS resistance value on the discharge socket (4) on the V2L Japanese standard discharge connection confirmation circuit or the CP and CS signals on the Japanese standard charging plug (6) on the Japanese standard AC charging connection confirmation circuit; The bidirectional vehicle-mounted inverter charger (10) determines whether to enter a discharge process or an AC charging process by detecting the CS resistance value on the discharge socket (4) on the V2L Japanese standard discharge connection confirmation circuit or the CP duty cycle signal or CS resistance value on the Japanese standard charging plug (6) on the Japanese standard AC charging connection confirmation circuit.

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