An integrated charging and discharging AC charging pile

Abstract

The application discloses an AC charging pile integrating charging and discharging, which comprises a charging gun part, a control box part and a connector part, wherein the charging gun part, the control box part and the connector part are connected with each other, the vehicle end is identified to be in a discharging mode, a mode two charging or a mode three charging, and the vehicle charging / discharging is performed. The charging pile is designed in linkage of the charging gun, the control box and the connector, only different B heads (plugs, two interfaces and three interfaces) need to be replaced, seamless switching of three scenes of the discharging mode, the mode two charging and the mode three charging can be realized, compared with the traditional scheme of purchasing multiple devices, the user's purchase cost and carrying burden are greatly reduced, the failure probability caused by too many devices is reduced, and the function integration and scene adaptability are significantly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of alternating current charging piles, in particular to an alternating current charging pile integrating charging and discharging. BACKGROUND

[0002] With the rapid popularization of new energy vehicles, the energy application scenarios are increasingly diversified, which directly promotes the continuous increase of charging and discharging product types. The related products commonly seen in the market at present are mainly divided into mode two charging piles, mode three charging piles and discharging guns, which correspond to different application scenarios: mode three charging piles are suitable for high-power charging scenarios such as parking spaces; mode two charging piles are used in charging environments where the power grid does not support high-power charging and can only provide small currents such as 8A / 10A / 16A; and the discharging gun meets the V2L discharging demand of outdoor camping and the like.

[0003] However, the current product classification brings many troubles to users. In order to cover all use scenarios, users often need to purchase and carry multiple devices of different types, which not only significantly increases the user's economic cost, but also brings the problem of inconvenience of carrying. At the same time, the use of multiple devices also increases the probability of failure, because the more devices there are, the greater the probability of failure, which not only affects the user's experience, but also increases the difficulty of maintenance.

[0004] For example, the application number 202010637318.6 discloses a multifunctional charging assembly for electric vehicles, which can realize fixed charging, on-board charging and discharging of electric vehicles through the charging pile assembly, mode two control box and external power transmission components. Although this scheme involves charging and discharging functions, it lacks flexibility in adapting to different power demand scenarios and cannot well meet the diversified discharging needs of users.

[0005] Therefore, in reality, there is a need for a charging and discharging integrated device integrating multiple functions, so that users only need to purchase one device to meet all charging and discharging needs. SUMMARY

[0006] In view of the above problems, the purpose of the present application is to provide an alternating current charging pile integrating charging and discharging, to solve the user's needs for charging and discharging devices in different scenarios, to realize one machine with multiple functions, and to reduce the problems of device purchase cost and carrying burden.

[0007] The purpose of the present application can be achieved by the following technical scheme: an alternating current charging pile integrating charging and discharging, comprising a charging gun part, a control box part and a connector part, wherein:

[0008] The charging gun part, the control box part and the connector part are mutually linked to identify that the vehicle end is in a discharging mode, a mode two charging or a mode three charging, and to charge / discharge the vehicle.

[0009] The control box part includes a double-pole double-throw relay and a charging row, wherein: the double-pole double-throw relay includes contacts CD, SW1, CC, SW', NC and SW2; the discharging row is integrally arranged with the control box part, and when the discharging row takes power from the charging gun line end, it does not pass through the charging circuit of the control box.

[0010] As a further aspect of the present application, the connector part includes an A head and a B head, the A head is integrally arranged with the control box part, and the B head is plugged with the A head, the B head is classified as a plug, a two-interface and a three-interface, wherein: the two-interface is provided with a detection resistor R1, and the three-interface is provided with a detection resistor R1'.

[0011] As a further aspect of the present application:

[0012] In the discharging mode, the double-pole double-throw relay SW1 end and CC end are conductive, and the NC end and SW2 end are conductive;

[0013] In the charging mode, the double-pole double-throw relay CD end and CC end are conductive, and the SW' end and SW2 end are conductive.

[0014] As a further aspect of the present application, the charging gun part includes a charging resistor, a discharging resistor and a switching switch, wherein the resistance values of the charging resistor and the discharging resistor change when the switching switch is switched, and the charging gun part is provided with a CC end for detecting a signal and a CP end for receiving a control signal.

[0015] As a further aspect of the present application: in the discharging mode, the charging gun part, the control box part and the connector part are interlinked, including:

[0016] The A head is connected to the plug, the double-pole double-throw relay makes the discharging resistor conductive with the CC end, the charging gun collects the discharging resistor at the CC end, and the vehicle end allows discharging.

[0017] As a further aspect of the present application: a resistor RD is connected between the double-pole double-throw relay and the discharging resistor, and when the A head is not connected to the plug, the discharging resistor is connected in series with the resistor RD.

[0018] As a further aspect of the present application: in the mode two charging, the charging gun part, the control box part and the connector part are interlinked, including:

[0019] The A head is connected to the two-interface, the double-pole double-throw relay makes the charging resistor conductive with the CC end, the charging gun collects the charging resistor at the CC end, the vehicle end allows charging, the double-pole double-throw relay SW' end detects the resistor R1, the CP end receives the current duty cycle control signal output by the control box, and the vehicle end is in the mode two charging state.

[0020] As a further place of the application: the charging gun part, the control box part and the connector part are interlocked during mode three charging, including:

[0021] A head connects three interfaces, and a double-pole double-throw relay enables the charging resistance to be conducted with the CC end, the charging gun collects the charging resistance at the CC end, the vehicle end allows charging, the double-pole double-throw relay detects R1' at the SW' end, and the CP end receives the current duty cycle control signal output by the control box, so that the vehicle end is in mode three charging state.

[0022] As a further place of the application: the charging gun part, the control box part and the connector A head are integrally arranged.

[0023] The beneficial effects of the application are:

[0024] 1. The charging pile of the application realizes seamless switching among discharge mode, mode two charging and mode three charging by the linkage design of the charging gun, the control box and the connector, and only needs to replace different B heads (plugs, two interfaces and three interfaces).

[0025] 2. The application automatically prohibits discharge when the plug is not installed, avoiding the risk of electric shock caused by misoperation. The combination of the resistance RD and the discharge resistance RC' enables the vehicle to recognize the plug-in state when the B head is not connected, avoiding the safety hazard of driving the vehicle with the plug. The control box relay can automatically switch the circuit according to the power supply state, adapt the incoming power through the connector resistance (R1 / R1'), accurately control the output current through the CP signal, prevent overload, and comprehensively upgrade the safety protection system of the device.

[0026] 3. The S3 and S3' switches of the charging gun of the application are linked by the same mechanical button. In the charging mode and the discharging mode, the user's demand for stopping charging or discharging or unplugging the gun can be recognized by the vehicle end through this button. In a conventional charging gun, only the charging function has this function, but in the structure of the application, the discharging function is still applicable, and a separate button is not needed to realize the user's demand for stopping discharging and unplugging the gun in the discharging state.

[0027] 4. The control box of the application automatically matches the incoming power and outputs the corresponding CP control signal duty cycle by detecting the resistance value of the connector B head (R1=2KΩ for mode two and R1'=230Ω for mode three), without manual adjustment, and adapts to different power grid capacities. At the same time, the charging and discharging circuit is independently designed, the circuit life is prolonged, and the failure rate is significantly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1Structure schematic diagram of the AC charging pile with integrated charging and discharging of the application;

[0029] Figure 2 Structure schematic diagram of the connector B head of the application;

[0030] Figure 3 Structure schematic diagram of the connection structure when the application is in the discharging mode;

[0031] Figure 4 Structure schematic diagram of the connection structure of the discharging socket when the application is in the discharging mode;

[0032] Figure 5 Structure schematic diagram of the connection structure when the application is not connected with the B head;

[0033] Figure 6 Structure schematic diagram of the connection structure when the application is in the second mode charging;

[0034] Figure 7 Structure schematic diagram of the connection structure when the application is in the third mode charging. DETAILED DESCRIPTION

[0035] Embodiments of the application are described below in detail, examples of which are shown in the drawings, wherein the same or similar symbols represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the application, and cannot be understood as a limitation of the application.

[0036] The existing charging technology has three scenarios: a large power charging scenario in a parking space (a third mode charging pile); a power grid that does not support large power charging scenario, only 8A / 10A / 16A charging (a second mode charging pile); and a wild camping and discharging demand scenario (V2L discharging gun). The market generally sells these three products, so that users need to purchase multiple piles, which is high in cost, inconvenient to carry, and also increases the failure rate.

[0037] In view of the above problems, the application discloses an AC charging pile with integrated charging and discharging.

[0038] Embodiment 1

[0039] As shown in Figure 1 , the embodiment discloses an AC charging pile with integrated charging and discharging, which comprises a charging gun part, a control box part and a connector part.

[0040] Through the mutual linkage between the charging gun part, the control box part and the connector part, it is identified that the vehicle end is in the discharging mode, the second mode charging or the third mode charging, and the vehicle charging / discharging is performed.

[0041] As shown in Figure 1 and Figure 2As shown, the connector part includes a head A and a head B. The head A and head B are interlocked. The head A is located inside the control box and is part of the control box. The head B is a separate part and is subdivided into a plug, a two-interface, and a three-interface.

[0042] Preferably, the charging gun, control box, and connector A are integrated into one unit, making it easy to carry and resulting in a compact overall structure that reduces assembly steps and improves product stability and durability.

[0043] When the vehicle is in discharge mode, connector B connects to connector A using a plug. When the vehicle needs to be charged in mode two, connector B connects to connector A using a two-interface connection. When the vehicle needs to be charged in mode three, connector B connects to connector A using a three-interface connection.

[0044] like Figure 3 As shown, the charging gun contains a resistor component that has both charging and discharging functions. The S3' and S3 switches in the charging gun are two switching switches that operate simultaneously under the control of a mechanical button. S3' is a single-pole single-throw normally closed switch, and S3 is a single-pole double-throw switch (one open and one closed).

[0045] Switches S3' and S3 are linked. S3' (single-pole single-throw normally closed switch) and S3 (single-pole double-throw switch) are controlled by the same mechanical button. When the button is pressed, both move synchronously: S3' opens and S3 switches to the charging resistor circuit; when the button is released, S3' closes and S3 resets to the discharging resistor circuit.

[0046] The charging resistor (R4=3.3KΩ, RC=220Ω) is used for charging status identification, and the discharging resistor (R4'=2.2KΩ, RC'=1KΩ) is used for discharging status identification. The circuit isolation is achieved by switching the resistors.

[0047] The control box section includes a double-pole double-throw relay, which includes contacts CD, SW1, CC, SW', NC, and SW2.

[0048] Furthermore, in discharge mode, the SW1 and CC terminals of the double-pole double-throw relay are connected, and the NC and SW2 terminals are connected; in charging mode, the CD and CC terminals of the double-pole double-throw relay are connected, and the SW' and SW2 terminals are connected.

[0049] Furthermore, a resistor RD is connected between the double-pole double-throw relay and the discharge resistor. When the plug is not connected to the A-head, the discharge resistor is connected in series with the resistor RD. Specifically, a 4.7K resistor RD is connected between the NC and M3CC pins, and a 4.7KΩ resistor is connected in series between the NC pin and the M3CC pin of the relay for gun insertion status detection and safety protection.

[0050] When the charging pile is discharging, the input end of the control box must be installed with a plug, at this time the vehicle end collects the discharge resistor at the CC position, the vehicle end allows discharging, otherwise the vehicle end collects the 4.7K+ discharge resistor which exceeds the discharge resistor defined in the national standard, and the vehicle does not allow discharging.

[0051] The RD resistor of 4.7K (or other resistance value) is added to ensure that when the user misoperates, the vehicle end can recognize the instrument plug-in state when the control box is not connected to any connector, and the phenomenon that the vehicle drags the charging gun to run does not occur.

[0052] The meanings of the pins of the control box include: L1 and N respectively represent the phase line and the zero line, which are the input lines of the alternating current power supply, providing power for the charging pile; PE represents the protective grounding line; +12V is the direct current 12V power supply in the control box, providing working voltage for the relay and other control elements; NTC is a negative temperature coefficient thermistor, and TEMP is a temperature interface, which are used for detecting the temperature of the charging gun or circuit to prevent overheating failure; CC and CP are respectively the Connection Confirmation and Control Pilot interfaces, which are the standard communication interfaces of new energy vehicle charging and discharging, used for state confirmation and signal interaction between the vehicle end and the charging pile; CD and FD are the Charge Detection and Discharge Detection interfaces, used for monitoring the charging and discharging state; BT represents the Battery Test interface, used for information interaction with the vehicle end battery system; 485A and 485B (9_485A and 8_485B) are the A and B lines of the RS485 communication interface, used for data transmission between the charging pile and external equipment (such as the background system); LT and NT (7_LT and 5_NT) are the Load Test and Node Test interfaces, used for monitoring the load state and circuit node connection condition; and M3CC (4_M3CC) is the Connection Confirmation interface, which realizes state recognition in cooperation with the resistor RD.

[0053] Using the structure of the application, the mutual linkage process between the charging gun part, the control box part and the connector part when the vehicle end is in the discharging mode includes:

[0054] In the discharging mode, as shown in Figure 3 the input end (A head) of the control box must be installed with a plug, and the charging gun button is not pressed (S3' is closed, and S3 connects the discharge resistor circuit).

[0055] The A head is connected to the plug, the double-pole double-throw relay makes the discharge resistor conduct with the CC end, the charging gun collects the discharge resistor at the CC end, and the vehicle end allows discharging.

[0056] The linkage logic is that according to the short-circuit of the plug and the 6_SW and 4_M3CC pins of the A head, the control box is not powered on, and the relay remains normally closed. At this time, the vehicle end CC interface can only detect the discharge resistance RC' (220Ω), and the resistance value is within the range of the discharge resistance defined in the national standard, so the vehicle end allows discharge.

[0057] Further, the double-pole double-throw relay is connected with the discharge resistance, and when the A head is not connected with the plug, the discharge resistance is connected with the resistance RD in series.

[0058] In the discharge mode, as shown in the figure, Figure 5 if the plug is not installed, the vehicle end CC interface will detect the series resistance of “RD (4.7KΩ, which can also be other resistance values) + RC' (220Ω)”, and the combined resistance exceeds the discharge resistance range specified in the national standard, and the vehicle end will trigger the discharge prohibition protection.

[0059] Compared with the conventional charging pile on the market, the charging pile increases the resistance RD between the NC pin and the M3CC pin of the control box. When the control box is not connected with any connector B head, even if the control box is not powered on, the vehicle end can still recognize the gun insertion state of the charging gun by detecting the combined resistance of RD+RC', so as to avoid the situation that the vehicle end drags the charging gun to drive, and to ensure the safety of the user in the case of misoperation.

[0060] Further, as shown in the figure, Figure 4 the control box part further includes a discharge socket. The discharge socket is integrated with the control box in structure, takes power from the charging gun line end, does not pass through the main power supply circuit of the charging control box, and the charging control part in the control box is not electrified during discharge.

[0061] In the mode two charging, as shown in the figure, Figure 6 the application scenario of this mode mainly appears in the scene of temporary demand charging (emergency power supply).

[0062] The A head is connected with the two interfaces, the double-pole double-throw relay makes the charging resistance and the CC end conductive, the charging gun collects the charging resistance at the CC end, the vehicle end allows charging, the double-pole double-throw relay detects the resistance R1 at the SW' end, and the vehicle end is in the mode two charging state.

[0063] The trigger condition is that the B head is connected with the two interfaces (built-in R1=2KΩ resistance) and the A head, the charging gun button is pressed (S3' is disconnected, and S3 is connected with the charging resistance circuit), and the control box is powered on.

[0064] The linkage logic is that after the control box is powered on, the double-pole double-throw relay switches to the normally open contact (CD, SW'), the charging resistance (R4, RC) is connected into the circuit, and the vehicle end recognizes RC (220Ω) through the CC interface and determines that it is a charging demand.

[0065] The control box detects R1 (2KΩ) of the two interfaces through the SW' pin, can match the 8A / 10A / 16A small power line-in capability, and the control box outputs the PWM wave with the corresponding duty ratio through the CP signal to limit the maximum demand current of the vehicle end.

[0066] As shown in the mode three charging, the mode is mainly used for the 7kW mode three state charging on the parking space, and the principle is the same as that in the mode two charging. Figure 7

[0067] The A head is connected with the three interfaces, the double-pole double-throw relay makes the charging resistance and the CC end conductive, the charging gun collects the charging resistance at the CC end, the vehicle end allows charging, the double-pole double-throw relay detects R1', the CP end receives the current duty ratio control signal output by the control box, and the vehicle end is in the mode three charging state.

[0068] The trigger condition is that the B head is connected with the three interfaces (the built-in R1' is 230Ω resistance) and the charging gun button is pressed, and the control box is powered on.

[0069] The linkage logic is consistent with the relay action logic in the mode two, the vehicle end enters the charging state through the CC interface to identify the charging resistance. After the control box detects R1' (230Ω), it is determined that the 32A high-power line-in (adapted to 7kW charging) is matched, the control box outputs the duty ratio PWM wave through the CP signal to meet the fast charging demand of the vehicle end.

[0070] Preferably, the charging gun part includes an NTC thermistor for detecting the working temperature of the charging gun and feeding back the detected temperature to the control box, and the control box adjusts the charging strategy in real time according to the received temperature information, so as to ensure the safety and efficiency of the charging process.

[0071] The embodiment realizes scene adaptation through the type switching of the B head, the charging gun switching switch links the double-pole double-throw relay to realize function switching, and the resistance RD realizes safety protection, so that the problems of traditional equipment dispersion carrying and many safety hazards are solved.

[0072] Embodiment 2

[0073] Based on the embodiment 1, the application discloses an alternating current charging pile with charging and discharging functions, and the circuits of the charging gun part, the control box part and the connector part are refined, and specifically, as shown in the figure: Figures 3-7

[0074] The charging gun part circuit includes:

[0075] The single-pole double-throw switch S3 is closed by default, one end of S3 is connected with PE, the other end of S3 is connected with the resistance R4 and one end of the resistance RC, the other end of R4 is connected with PE, and the other end of RC is connected with the control box CD end; when the switch is switched to be closed, one end of S3 is connected with PE, and the other end of S3 is connected with the control box BT end.​​

[0076] Single-pole single-throw switch S3', closed by default, one end of S3' is connected with PE and one end of resistor R4', the other end of S3' is connected with the other end of R4' and one end of RC', the other end of RC' is connected with the end of control box FD.

[0077] L end of L1 is connected with the end of control box L; N end is connected with the end of control box N; CC end is connected with the end of control box CC; CP end is connected with the end of control box CP.

[0078] The control box part circuit includes:

[0079] When the double-pole double-throw relay discharge mode is closed by default, the double-pole double-throw relay SW1 end and CC end are conductive, NC end and SW2 end are conductive; the double-pole double-throw relay SW1 end is connected with SW2 end and connector 6_SW end; the double-pole double-throw relay NC end is connected with one end of resistor RD, the other end of resistor RD is connected with FD end and connector 4_M3CC end; the double-pole double-throw relay CC end is connected with the end of charging gun CC.

[0080] When the double-pole double-throw relay charging mode is closed, the double-pole double-throw relay is connected with +12V power supply and PE end, the double-pole double-throw relay CD end and CC end are conductive, SW' end and SW2 end are conductive, SW' is connected with control box detection, the double-pole double-throw relay CD end is connected with the other end of charging gun resistor RC; the double-pole double-throw relay CC end is connected with the end of charging gun CC; the double-pole double-throw relay SW1 end is connected with SW2 end and 6_SW end of A head.

[0081] The control box L end is connected with the end of connector 2_L, and the control box N end is connected with the end of connector 1_N.

[0082] Further, when B head is used as a plug, 6_SW end of A head and 4_M3CC end are short-circuited; when B head is used as a two-interface, it includes resistor R1, one end of R1 is connected with PE, and the other end of R1 is connected with 6_SW end of A head; when B head is used as a three-interface, it includes resistor R1', one end of R1' is connected with PE, and the other end of R1' is connected with 6_SW end of A head.

[0083] Preferably, when B head is used as a three-interface, it further includes NTC thermal resistance to detect the working temperature of the three-interface, and feedback the detected temperature to the control box.

[0084] By using the above circuit structure, the linkage logic of the charging gun and the control box includes:

[0085] S3 (single-pole double-throw) and S3' (single-pole single-throw normally closed) switches of the charging gun are linked through the same mechanical button to realize physical switching of charging and discharging states.

[0086] In the discharging state, when the button is not triggered, S3' remains normally closed. At this time, RC' (1KΩ) forms a discharge identification loop, and the vehicle end detects RC' resistance through the CC interface to confirm that the discharge is ready.

[0087] Charge state: after the button is triggered, S3 switches to BT, and S3' is disconnected. R4 and RC form a charging identification circuit, and the vehicle end detects RC resistance through the CC interface, and switches to the charging mode.

[0088] The double-pole double-throw relay of the control box is switched, and the state is determined by the power supply condition of the control box. When the power is off (discharge mode), the relay remains normally closed, the double-pole double-throw relay SW1 end and the CC end are conductive, the NC end and the SW2 end are conductive, and the SW1 end is conductive by default. The SW2 end is conductive.

[0089] If the A head is not installed with a plug, the resistance RD (4.7KΩ) is connected to the circuit, and the vehicle end CC interface detects RD+RC' (4.7K+220Ω), which exceeds the national standard discharge resistance range (usually ≤2KΩ), and the discharge is prohibited, and the recognition of the plug not installed is realized.

[0090] If the A head is installed with a plug, the control box is short-circuited (6_SW and 4_M3CC), the RD resistance is short-circuited, and the vehicle end only detects RC', which meets the discharge standard and allows discharge.

[0091] When the power is on (charging mode): the double-pole double-throw relay CD end and the CC end are conductive, the SW' end and the SW2 end are conductive, and the SW1 end is conductive by default. The SW2 end is conductive.

[0092] At this time, the control box detects the resistance of the connector B head (two interfaces R1=2KΩ / three interfaces R1'=230Ω).

[0093] The control box can automatically match the incoming line overcurrent capacity; when the two interfaces (mode two) R1=2KΩ, it can correspond to 8A / 10A / 16A small power, and the control box limits the output current through the CP signal output duty cycle PWM wave.

[0094] When the three interfaces (mode three) R1'=230Ω correspond to 32A high power (7kW), the control box CP signal duty cycle is improved to meet the fast charging demand.

[0095] Preferably, when the three interfaces, the control box recognizes and outputs the corresponding current signal, and realizes data interaction through the 485A / B interface (9_485A / 8_485B), and supports intelligent charging management.

[0096] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacement or change within the technical range disclosed by the present application according to the technical scheme and the inventive concept of the present application, which should be covered within the protection scope of the present application.

[0097] In this application, unless otherwise clearly indicated and limited, the terms "mounting", "connection", "connecting", "fixed", and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

Claims

1. An AC charging pile integrating charging and discharging, characterized in that, The charging gun part, the control box part and the connector part are connected with each other, and the vehicle is charged / discharged when the vehicle end is in the discharging mode, the mode two charging mode or the mode three charging mode; The control box part comprises a double-pole double-throw relay and a charging strip, wherein the double-pole double-throw relay comprises contacts CD, SW1, CC, SW', NC and SW2; the discharging strip is integrally arranged with the control box part, and when the discharging strip takes power from the charging gun line end, the charging circuit of the control box is not passed through; The connector part comprises an A head and a B head, the A head is integrally arranged with the control box part, the B head is plugged with the A head, and the B head is classified into a plug head, a two-interface and a three-interface, wherein the two-interface is provided with a detection resistor R1, and the three-interface is provided with a detection resistor R1'; In the discharging mode, the double-pole double-throw relay SW1 end and the CC end are conducted, and the NC end and the SW2 end are conducted; In the charging mode, the double-pole double-throw relay CD end and the CC end are conducted, and the SW' end and the SW2 end are conducted; The charging gun part circuit comprises: a single-pole double-throw switch S3, when closed by default, one end of S3 is connected with PE, the other end of S3 is connected with a resistor R4 and one end of a resistor RC, the other end of R4 is connected with PE, and the other end of RC is connected with the CD end of the control box; when switched to be closed, one end of S3 is connected with PE, and the other end of S3 is connected with the BT end of the control box; The single-pole single-throw switch S3' is closed by default, one end of S3' is connected with PE and one end of a resistor R4', the other end of S3' is connected with the other end of R4' and one end of RC', and the other end of RC' is connected with the FD end of the control box; The L1 end is connected with the L end of the control box, the N end is connected with the N end of the control box, the CC end is connected with the CC end of the control box, and the CP end is connected with the CP end of the control box; The control box part circuit comprises: in the discharging mode, the double-pole double-throw relay SW1 end and the CC end are conducted, and the NC end and the SW2 end are conducted; the double-pole double-throw relay SW1 end is connected with the SW2 end and the 6_SW end of the connector; the double-pole double-throw relay NC end is connected with one end of a resistor RD, the other end of the resistor RD is connected with the FD end and the 4_M3CC end of the connector; and the double-pole double-throw relay CC end is connected with the CC end of the charging gun; In the charging mode, the double-pole double-throw relay is connected with +12V power supply and PE end, the double-pole double-throw relay CD end and the CC end are conducted, the SW' end and the SW2 end are conducted, the SW' is connected with the control box detection, the double-pole double-throw relay CD end is connected with the other end of the charging gun resistor RC; the double-pole double-throw relay CC end is connected with the CC end of the charging gun; and the double-pole double-throw relay SW1 end is connected with the SW2 end and the 6_SW end of the A head; The control box L end is connected with the 2_L end of the connector, and the control box N end is connected with the 1_N end of the connector. The charging gun part comprises charging resistors, discharging resistors and a switching switch, wherein the resistance values of the charging resistors and the discharging resistors change when the switching switch is switched, the charging gun part is provided with a CC end for detecting a signal and a CP end for receiving a control signal.

2. The alternating current charging station of claim 1, wherein, In the discharging mode, the charging gun part, the control box part and the connector part are connected with each other, and 3. The alternating current charging station according to claim 1 or 2, characterized in that: ​ A head connects the plug, double pole double throw relay makes discharge resistance and CC terminal conduction, charging gun in CC terminal collected discharge resistance, vehicle end allows discharge.

4. The alternating current charging station of claim 3, wherein: The double pole double throw relay is connected with the discharge resistance and has a resistance RD, and when the A head is not connected with the plug, the discharge resistance is connected with the resistance RD in series.

5. The alternating current charging station of claim 1 or 2, wherein: When the mode two charging, the charging gun part, the control box part and the connector part are interlinked, including: A head connects the two interfaces, double pole double throw relay makes charging resistance and CC terminal conduction, charging gun in CC terminal collected charging resistance, vehicle end allows charging, double pole double throw relay SW' end detects resistance R1, CP end receives the current duty control signal output by the control box, and the vehicle end is in mode two charging state.

6. The alternating current charging station of claim 1 or 2, wherein: When the mode three charging, the charging gun part, the control box part and the connector part are interlinked, including: A head connects the three interfaces, double pole double throw relay makes charging resistance and CC terminal conduction, charging gun in CC terminal collected charging resistance, vehicle end allows charging, double pole double throw relay SW' end detects R1', CP end receives the current duty control signal output by the control box, and the vehicle end is in mode three charging state.

7. The alternating current charging station of claim 1, wherein: The charging gun part, the control box part and the connector A head are integrally arranged.

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