Control circuit, charging gun assembly and charging and discharging equipment

Abstract

The utility model discloses a control circuit, a charging gun assembly and charging and discharging equipment, and relates to the technical field of battery charging and discharging. The circuit comprises a CP signal end used for receiving a CP signal; the first end of the first voltage dividing unit is connected with the CP signal end; the first end of the first switch unit is connected with the second end of the first voltage dividing unit, the second end of the first switch unit is used for being connected with a first control guide terminal of the charging and discharging connecting assembly, and the third end of the first switch unit is used for being connected with a second control guide terminal of the vehicle. The first switch unit is configured to communicate the first end with the second end or the third end based on the type of the CP signal. The circuit can transmit a CP signal, which is a charging control signal, to the second control guide terminal in a charging mode; and in the discharging mode, the CP signal of which the type is the preset voltage signal is transmitted to the first control guide terminal, so that interference of a charging and discharging mode is avoided by multiplexing a CP loop, the circuit is simple, and the cost is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle charging technical field especially, relate to a control circuit, charging gun subassembly and charge -discharge equipment. BACKGROUND

[0002] In the related art, as shown in the figure, the working mode is identified through the resistance between the terminal JC and PE, when the charging mode is identified, the single-pole double-throw switch S1, S2 is closed to the right side, when the discharging mode is identified, the single-pole double-throw switch S1, S2 is closed to the left side. Figure 1 That is to say, in order to avoid the interference of charge-discharge mode, two voltage division detection circuits are set, and the required electrical components are more, the circuit is more complex, and the cost is higher. UTILITY MODEL CONTENT

[0003] The utility model aims at at least one of the technical problems in the related art to some extent. Therefore, the purpose of the utility model is to provide a control circuit, a charging gun subassembly and a charge-discharge equipment, so as to reduce the use of electrical components, reduce the complexity of the circuit and reduce the cost while avoiding the interference of charge-discharge mode.

[0004] In the first aspect, the utility model provides a control circuit, which comprises: a CP signal end for receiving a CP signal; a first voltage division unit, the first end of the first voltage division unit is connected with the CP signal end; a first switch unit, the first end of the first switch unit is connected with the second end of the first voltage division unit, the second end of the first switch unit is used to connect the first control guide terminal of the charge-discharge connection assembly, the third end of the first switch unit is used to connect the second control guide terminal of the vehicle, and the first switch unit is configured to connect the first end of the first switch unit with the second end of the first switch unit or the first end of the first switch unit with the third end of the first switch unit based on the type of the CP signal.

[0005] Exemplarily, the first end of the first switch unit is connected with the second end, the first switch unit comprises a single-pole single-throw switch, the first end of the single-pole single-throw switch is used to connect the first control guide terminal, and the second end of the single-pole single-throw switch is used to connect the second control guide terminal.

[0006] Exemplarily, the first switch unit comprises a single-pole double-throw switch, the fixed end of the single-pole double-throw switch is connected with the second end of the first voltage division unit, the first movable end of the single-pole double-throw switch is used to connect the first control guide terminal, and the second movable end of the single-pole double-throw switch is used to connect the second control guide terminal.

[0007] Exemplarily, the first voltage dividing unit comprises a first resistor, a first end of the first resistor is connected with the CP signal end, and a second end of the first resistor is connected with a first end of the first switch unit.

[0008] Exemplarily, the circuit further comprises a detection end, the detection end is connected with a second end of the first voltage dividing unit and a first end of the first switch unit respectively, and the detection end is configured to output a detection voltage, the detection voltage being used to determine a target discharging procedure.

[0009] Exemplarily, the circuit further comprises a power supply control unit, the power supply control unit is connected with the CP signal end and a control end of the first switch unit respectively, and the power supply control unit is configured to send a charging control signal to the CP signal end according to a power supply voltage accessed to the control circuit, and control a first end and a third end of the first switch unit to be in communication, or send a preset voltage signal to the CP signal end, and control the first end and a second end of the first switch unit to be in communication.

[0010] Exemplarily, the circuit further comprises a voltage sampling unit, the voltage sampling unit is connected with the power supply control unit, and the voltage sampling unit is configured to detect the power supply voltage accessed to the control circuit and transmit the power supply voltage to the power supply control unit.

[0011] Exemplarily, the power supply control unit is further connected with the detection end, and the power supply control unit is further configured to determine the target discharging procedure according to the detection voltage in a discharging mode.

[0012] In a second aspect, the utility model provides a kind of charging gun assembly, comprising: the control circuit of first aspect.

[0013] In a third aspect, the utility model provides a kind of charging and discharging equipment, comprising: charging and discharging connection assembly;And the charging gun assembly of second aspect, the charging gun assembly is connected with the charging and discharging connection assembly.

[0014] Exemplarily, the charging and discharging connection assembly comprises: charging plug assembly and / or discharging power strip assembly, and the charging plug assembly and the discharging power strip assembly are connected with the charging gun assembly.

[0015] Exemplarily, the discharging power strip assembly comprises: second voltage dividing unit and second control guide terminal, a first end of the second voltage dividing unit is connected with the second control guide terminal, a second end of the second voltage dividing unit is grounded, and the second control guide terminal is connected with the first switch unit in the charging gun assembly.

[0016] The control circuit, the charging gun assembly and the charge-discharge equipment of the utility model, under the charging mode, send charging control signal to CP signal end, and control first switch unit, make charging control signal transmit to second control guide terminal in turn through first voltage division unit and first switch unit;Under the discharging mode, send preset voltage signal to CP signal end, and control first switch unit, make preset voltage signal transmit to first control guide terminal in turn through first voltage division unit and first switch unit.Under different mode, receive different CP signal through CP signal end, and control first switch unit to execute different action, make CP signal transmit to different control guide terminal, in order to carry out detection and control under corresponding mode, realized charging mode and discharging mode mutual non-interference, and the circuit needs few electric elements, low complexity, low cost. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Is the topology diagram of the control circuit in the related art;

[0018] Figure 2 Is the structure block diagram of the control circuit of the utility model embodiment;

[0019] Figure 3 Is the topology diagram of the control circuit of one embodiment of the utility model;

[0020] Figure 4 Is the topology diagram of the control circuit of another embodiment of the utility model;

[0021] Figure 5 Is the structure schematic diagram of the charge-discharge equipment of one embodiment of the utility model;

[0022] Figure 6 Is the structure schematic diagram of the discharging socket assembly of one embodiment of the utility model;

[0023] Figure 7 Is the flow chart of the charge-discharge control of one embodiment of the utility model;

[0024] Figure 8 Is the flow chart of the charge-discharge control of another embodiment of the utility model;

[0025] Figure 9 Is the structure block diagram of the charging gun assembly of the utility model embodiment;

[0026] Figure 10 Is the structure block diagram of the charge-discharge equipment of the utility model embodiment. DETAILED DESCRIPTION

[0027] The embodiments of the present application are described below in detail, examples of the embodiments are shown in the drawings, wherein the same or similar notations 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 intended to explain the present application, and cannot be understood as a limitation of the present application.

[0028] The control circuit, the charging gun assembly and the charging and discharging device of the embodiments of the present application are described below with reference to the drawings.

[0029] As shown in Figure 2 , the control circuit 10 comprises a CP signal end 1, a first voltage dividing unit 2 and a first switching unit 3. The CP signal end 1 is used to receive a CP signal; the first end of the first voltage dividing unit 2 is connected with the CP signal end 1; the first end of the first switching unit 3 is connected with the second end of the first voltage dividing unit 2, the second end of the first switching unit 3 is used to connect the first control guide terminal of the charging and discharging connection assembly 200, and the third end of the first switching unit 3 is used to connect the second control guide terminal of the vehicle 300. The first switching unit 3 is configured to connect the first end of the first switching unit 3 with the second end of the first switching unit 3 or the first end of the first switching unit 3 with the third end of the first switching unit 3 based on the type of the CP signal.

[0030] Exemplarily, the control circuit 10 can be integrated in the charging gun assembly 100 (as shown in Figure 3 , Figure 4 , Figure 5 ), the charging and discharging connection assembly 200 comprises a charging plug assembly 210 (as shown in Figure 3 , Figure 4 , Figure 5 ) and / or a discharging power strip assembly 220 (as shown in Figure 5 , Figure 6 ).

[0031] Referring to Figure 5 , the charging gun assembly 100 can be connected with the vehicle 300 to be charged and discharged, the charging gun assembly 100 is connected with the charging plug assembly 210 and / or the discharging power strip assembly 220, and specifically can be connected through the cable 20. The charging plug assembly 210 is an electric plug, for example, a three-plug for home use. The charging plug assembly 210 is connected with the power supply on one side to obtain power, and is connected with the charging gun assembly 100 on the other side to charge the vehicle 300. The discharging power strip assembly 220 is an electric socket. The electric energy in the vehicle can be obtained by plugging the external electric equipment into the discharging power strip assembly 220.

[0032] In this embodiment, in the charging mode, the CP signal received by the CP signal terminal 1 is a charging control signal (such as a pulse width modulation (PWM) signal), which is transmitted to the second control guide terminal in sequence through the first voltage dividing unit 2 and the first switching unit 3; in the discharging mode, the CP signal received by the CP signal terminal 1 is a preset voltage signal, which is transmitted to the first control guide terminal in sequence through the first voltage dividing unit 2 and the first switching unit 3.

[0033] Specifically, after the control circuit 10 is connected to the vehicle 300, if the external power supply device is connected through the charging and discharging connection assembly 200, the external power supply device can charge the vehicle 300, and the external power supply device outputs electric energy; if the external power consumption device is connected through the charging and discharging connection assembly 200, the vehicle 300 can discharge the external power consumption device, and the vehicle 300 outputs electric energy. Since the sources of electric energy are different in the two cases, the charging mode and the discharging mode can be determined by the voltage of the power supply (the external power supply device or the vehicle 300) connected to the control circuit 10. For example, when the power supply voltage is greater than a preset voltage threshold (such as 60V), it is determined as the charging mode, otherwise it is determined as the discharging mode. Alternatively, the charging mode and the discharging mode can also be determined according to the resistance value connected to the connection confirmation terminal.

[0034] When the charging mode is identified, a charging control signal is sent to the CP signal terminal, and the first end of the first switching unit 3 is connected to the third end, at this time the charging control signal can be transmitted to the second control guide terminal in sequence through the first voltage dividing unit 2 and the first switching unit 3, and after the vehicle controller of the vehicle 300 receives the control signal, the vehicle controller can perform charging control according to the charging control signal. When the discharging mode is identified, a preset voltage signal (such as a 12V voltage) is sent to the CP signal terminal, and the first end of the first switching unit 3 is connected to the second end, at this time the preset voltage signal can be transmitted to the first control guide terminal in sequence through the first voltage dividing unit 2 and the first switching unit 3, if the second voltage dividing unit connected between the first control guide terminal and the ground is provided in the charging and discharging connection assembly 200, the target discharging process can also be determined by detecting the voltage across the second voltage dividing unit, that is, selecting how much current to discharge, such as a 16A discharging process, a 32A discharging process, etc., and the information can be transmitted to the vehicle controller of the vehicle 300 through the connection confirmation terminal CC, and the vehicle controller can perform discharging control according to the information.

[0035] The control circuit 10 has a vehicle charging mode and a V2L (Vehicle to Load) discharging mode, and in different modes, different CP signals can be received through the CP signal end, and the first switch unit 3 is controlled to perform different actions, so that the CP signal is transmitted to different control guide terminals, so as to perform detection and control in the corresponding mode, realize the charging mode and the discharging mode without interference, and the circuit requires few electrical components, low complexity and low cost.

[0036] In some embodiments of the utility model, see Figure 3 、 Figure 4 The control circuit 100 further comprises a detection end (i.e. detection point 1), which is connected with the second end of the first voltage dividing unit 2 and the first end of the first switch unit 3 respectively, and is configured to output a detection voltage, which is used to determine a target discharging process (such as a 32A discharging process, a 16A discharging process, etc.).

[0037] In some embodiments of the utility model, see Figure 3 、 Figure 4 The control circuit 100 further comprises a power supply control unit 4, which is connected with the CP signal end 1 and the control end of the first switch unit 3 respectively, and is configured to send a charging control signal to the CP signal end 1 according to the power supply voltage connected to the control circuit 100, and control the first end and the third end of the first switch unit 3 to be in communication, or send a preset voltage signal to the CP signal end 1, and control the first end and the second end of the first switch unit 3 to be in communication.

[0038] Exemplarily, see Figure 3 、 Figure 4 The control circuit 100 further comprises a voltage sampling unit 5, which is connected with the power supply control unit 4 and is configured to detect the power supply voltage connected to the control circuit 100 and transmit the power supply voltage to the power supply control unit 4.

[0039] In some other embodiments of the utility model, the power supply control unit 4 is configured to detect the resistance value of the connection confirmation terminal CC, determine the charging and discharging mode according to the resistance value, and send the corresponding CP signal to the CP signal end according to the determined mode.

[0040] For example, see Figure 3 、 Figure 4A detection point can be arranged in the connection line connected with the connection confirmation terminal CC, and the detection point is connected with the power supply control unit 4. The power supply control unit 4 can detect the resistance value of the connection confirmation terminal CC through the detection point. Different resistances can be arranged in the charging and discharging connection assembly 200 and connected with the CC terminal under different standards. The resistance value after the resistance is connected with the resistance R6 in parallel (the switch S5 is not closed) is the detected resistance value. The resistance value arranged in the charging and discharging connection assembly 200 can be determined according to the detected resistance value, and the type of the charging and discharging connection assembly 200 (the plug, the power strip, and the corresponding allowed charging and discharging current) can be determined.

[0041] In some examples, referring to Figure 3 、 Figure 4 , the power supply control unit 4 is also connected with the detection terminal (i.e. the detection point 1) and is configured to determine the target discharging process according to the detection voltage in the discharging mode.

[0042] Specifically, the resistances of the first control guide terminal connected in the charging and discharging connection assembly 200 are different, and the detection voltage of the detection terminal detected when the CP signal received by the CP signal terminal is the preset voltage signal is different. Since different voltages correspond to different discharging processes, the target discharging process can be determined according to the voltage of the detection terminal. Then, the power supply control unit 4 can also transmit the information containing the target discharging process to the vehicle controller through the connection confirmation terminal CC. For example, the switch S5 can be controlled to perform different actions according to the target discharging process, and the vehicle controller can determine the target discharging process by identifying the action of the switch S5.

[0043] It should be noted that, Figure 3 、 Figure 4 The circuit connected with the connection confirmation terminal (including the resistance R6, the RC1 and the switches S3 and S5) is exemplary, and can also be in other circuit forms, for example, two resistances connected in series between the terminals CC and PE, and one of the resistances is connected with a switch in parallel.

[0044] Exemplarily, referring to Figure 3 、 Figure 3 The first voltage dividing unit 2 includes a first resistance R1, a first end of the first resistance R1 is connected with the CP signal terminal 1, and a second end of the first resistance R1 is connected with a first end of the first switch unit 3.

[0045] The resistance value of the first resistance R1 can be calibrated as needed. If a second voltage dividing unit is arranged in the charging and discharging connection assembly 200, the second voltage dividing unit includes a resistance RM, and the detection voltage of the detection terminal is U*RM / (RM+R1), U is the voltage value corresponding to the preset voltage signal. According to the voltage, the type of RM can be determined, and the target discharging process can be determined.

[0046] In some embodiments of the utility model, such as Figure 7 As shown in the figure, the first end and the second end of the first switch unit 2 are connected, and the first switch unit 2 includes a single-pole single-throw switch S4, the first end of the single-pole single-throw switch S4 is used to connect the first control guide terminal, and the second end of the single-pole single-throw switch S4 is used to connect the second control guide terminal.

[0047] Specifically, referring to Figure 4 , the power supply control unit 4 identifies the current working mode by the power supply voltage and the voltage of the detection point 1; the power supply control unit 4 controls the output of the CP voltage, and by default, no output; the resistance RM is arranged in the charge-discharge connection assembly 200, which is used for the power supply control unit 4 to identify the working mode; and the switch S4 is disconnected by default.

[0048] When the power supply control unit 4 is powered on and in a working state, as shown in the figure, Figure 4 Firstly, the power supply voltage is acquired, if the power supply voltage is greater than a preset voltage threshold, such as 60V, it is judged that the current is in the charging mode, the switches S4 and S5 are closed, and the charging control signal is output to the CP signal end 1, and the switches K1 and K2 are closed, and the charging mode is entered. If the power supply voltage is less than or equal to the preset voltage threshold, it is judged that the current can be in the discharging mode, the switch S4 is kept disconnected, and a preset voltage signal, such as 12V voltage, is continuously output to the CP signal end 1, so as to identify the target discharging process by the voltage of the detection point 1. If the voltage of the detection point 1 is in the first voltage interval, such as 3-5.5V, it is determined that the connection of each component is reliable, and the switches K1 and K2 are controlled to be closed, and the 16A discharging process is entered; if the voltage of the detection point 1 is in the second voltage interval, such as 6.5-9V, it is determined that the connection of each component is reliable, and the switches K1 and K2 are controlled to be closed, and the 32A discharging process is entered.

[0049] In some other embodiments of the utility model, as shown in the figure, Figure 8 The first switch unit 2 includes a single-pole double-throw switch S4', the fixed end of the single-pole double-throw switch S4' is connected with the second end of the first voltage dividing unit 2, the first movable end of the single-pole double-throw switch S4' is used to connect the first control guide terminal, and the second movable end of the single-pole double-throw switch S4' is used to connect the second control guide terminal.

[0050] Specifically, referring to Figure 3 , the power supply control unit 4 identifies the current working mode by the power supply voltage and the voltage of the detection point 1; the power supply control unit 4 controls the output of the CP voltage, and by default, no output; the resistance RM is arranged in the charge-discharge connection assembly 200, which is used for the power supply control unit 4 to identify the working mode; and the fixed end of the switch S4' is connected with the second movable end by default.

[0051] When the power supply control unit 4 is powered on and in a working state, as shown in the figure, Figure 4As shown, first, the power voltage is acquired, if the power voltage is greater than a preset voltage threshold, such as 60V, it is judged that the current is in the charging mode, the fixed terminal of the switch S4' is controlled to keep connected with the second movable terminal, the switch S5 is controlled to be closed, the charging control signal is output to the CP signal end 1, and the switches K1 and K2 are controlled to be closed, and the charging mode is entered.

[0052] The switches K1 and K2 can be relays, which are arranged in the charging gun assembly 100 and are used for on-off control of the live wire and the zero wire in the charging gun assembly 100, so as to further protect the charging gun assembly 100.

[0053] It should be noted that, Figure 9 , Figure 9 The other electrical elements in the control circuit 10, such as the switches S1, S6 and S2, the resistors R2 and R3, and the diode D1, wherein the switch S1 can be an over-temperature protection switch, when the temperature exceeds a certain value, the switch S1 is closed, the vehicle controller can detect the abnormality through the detection point 2 and stop charging; the switch S6 can be a locking switch, which is used for manually stopping charging; the switch S2, the resistors R2 and R3, and the diode D1 can make the vehicle controller realize reliable charging control.

[0054] Figure 10 is a structural block diagram of the charging gun assembly in the embodiment of the utility model.

[0055] As shown in Figure 10 , the charging gun assembly 100 comprises the control circuit 10 in the above embodiment.

[0056] Specifically, the charging gun assembly 100 can comprise a control box and a charging gun, the charging gun is used to connect the charging and discharging socket of the vehicle, and the control circuit 10 can be arranged in the control box.

[0057] Figure 5 is a structural block diagram of the charging and discharging equipment in the embodiment of the utility model.

[0058] As shown in Figure 5 , the charging and discharging equipment 1000 comprises a charging and discharging connection assembly 200 and a charging gun assembly 100, and the charging gun assembly 100 is connected with the charging and discharging connection assembly 200.

[0059] In some embodiments of the utility model, as shown in Figure 5 The user can select different charging and discharging connection assemblies 200 and charging gun assemblies 100 according to needs.

[0060] Exemplarily, referring to Figure 5 The charging and discharging connection assembly 200 includes a charging plug assembly 210 and / or a discharging power strip assembly 220 (as an example). Figure 5 The charging plug assembly 210 and the discharging power strip assembly 220 are connected with the charging gun assembly 100.

[0061] When the charging and discharging device 1000 simultaneously includes the charging plug assembly 210 and the discharging power strip assembly 220, it has multiple functions and can quickly switch between charging mode and discharging mode, so that the user can conveniently select use and meet more use requirements of the user.

[0062] In some embodiments of the utility model, referring to Figure 5 The discharging power strip assembly 220 includes a second voltage dividing unit and a second control guide terminal, the first end of the second voltage dividing unit is connected with the second control guide terminal, the second end of the second voltage dividing unit is grounded, and the second control guide terminal is used to be connected with the first switch unit 3 in the charging gun assembly 100.

[0063] Exemplarily, referring to ​ The second voltage dividing unit can include a resistor RM connected between ground and the second control guide terminal.

[0064] Optionally, referring to ​ The discharging power strip assembly 220 can also include a resistor RC2 connected between ground and a connection confirmation terminal CC, used to make the power supply control unit 4 and the vehicle controller confirm the connection between the charging gun assembly 100 and the discharging power strip assembly 220. Similarly, the charging plug assembly 210 can also include a resistor connected between ground and the connection confirmation terminal CC, used to make the power supply control unit 4 and the vehicle controller confirm the connection between the charging gun assembly 100 and the discharging power strip assembly 220, and identify the target charging process.

[0065] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In the description of the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0066] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0067] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the utility model, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0068] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0069] In the utility model, unless another definite provision and limitation, first feature is on second feature "on" or "under" can be first and second feature direct contact, or first and second feature indirectly contact through intermediate medium. Moreover, first feature is on second feature "on", "above" and "on" can be first feature is on second feature directly above or obliquely above, or just indicate first feature horizontal height is higher than second feature. First feature is on second feature "under", "below" and "under" can be first feature is on second feature directly below or obliquely below, or just indicate first feature horizontal height is less than second feature.

[0070] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary, and cannot be understood as the limitation of the utility model, and the ordinary skilled in the art can change, modify, replace and transform the above-mentioned embodiments within the scope of the utility model.

Claims

1. A control circuit, characterized by The circuit comprises: a CP signal terminal configured to receive a CP signal; a first voltage dividing unit, a first end of the first voltage dividing unit being connected to the CP signal terminal; a first switch unit, a first end of the first switch unit being connected to a second end of the first voltage dividing unit, a second end of the first switch unit being configured to be connected to a first control guide terminal of a charge-discharge connection assembly, and a third end of the first switch unit being configured to be connected to a second control guide terminal of a vehicle, the first switch unit being configured to connect the first end of the first switch unit to the second end of the first switch unit or to connect the first end of the first switch unit to the third end of the first switch unit based on a type of the CP signal.

2. The control circuit of claim 1, wherein, The first end and the second end of the first switch unit are connected, and the first switch unit comprises a single-pole single-throw switch, a first end of the single-pole single-throw switch being configured to be connected to the first control guide terminal, and a second end of the single-pole single-throw switch being configured to be connected to the second control guide terminal.

3. The control circuit of claim 1, wherein, The first switch unit comprises a single-pole double-throw switch, a fixed end of the single-pole double-throw switch being connected to the second end of the first voltage dividing unit, a first movable end of the single-pole double-throw switch being configured to be connected to the first control guide terminal, and a second movable end of the single-pole double-throw switch being configured to be connected to the second control guide terminal.

4. The control circuit of claim 1, wherein, The first voltage dividing unit comprises a first resistor, a first end of the first resistor being connected to the CP signal terminal, and a second end of the first resistor being connected to the first end of the first switch unit.

5. The control circuit of any one of claims 1-4, wherein, The circuit further comprises: a detection terminal, the detection terminal being connected to the second end of the first voltage dividing unit and the first end of the first switch unit respectively, the detection terminal being configured to output a detection voltage, the detection voltage being configured to determine a target discharge procedure.

6. The control circuit of claim 5, wherein, The circuit further comprises: a power supply control unit, the power supply control unit being connected to the CP signal terminal and a control terminal of the first switch unit respectively, the power supply control unit being configured to send a charging control signal to the CP signal terminal according to a power supply voltage accessed by the control circuit, and control the first end of the first switch unit to be connected to the third end of the first switch unit, or send a preset voltage signal to the CP signal terminal, and control the first end of the first switch unit to be connected to the second end of the first switch unit.

7. The control circuit of claim 6, wherein, The circuit further comprises: a voltage sampling unit, the voltage sampling unit being connected to the power supply control unit, and being configured to detect the power supply voltage accessed by the control circuit and transmit the power supply voltage to the power supply control unit.

8. The control circuit of claim 6, wherein, The power supply control unit is further connected to the detection terminal, and is further configured to determine the target discharge procedure according to the detection voltage in a discharge mode.

9. A charging gun assembly, characterized in that, The control circuit comprises: The control circuit according to any one of claims 1-8.

10. A charge and discharge device, characterized by comprising: The control circuit comprises: a charge-discharge connection assembly; and The charging gun assembly according to claim 9, the charging gun assembly being connected to the charge-discharge connection assembly.

11. The charge and discharge device according to claim 10, wherein The charge-discharge connection assembly comprises a charging plug assembly and / or a discharge power strip assembly, the charging plug assembly and the discharge power strip assembly being connected to the charging gun assembly.

12. The charge and discharge device according to claim 11, wherein The discharge power strip assembly comprises a second voltage dividing unit and a second control guide terminal, a first end of the second voltage dividing unit is connected with the second control guide terminal, a second end of the second voltage dividing unit is grounded, and the second control guide terminal is connected with a first switch unit in the charging gun assembly.

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