Alternating current charging pile ordered charging control circuit

Abstract

The utility model discloses an orderly charging control circuit for an AC charging pile, and the circuit comprises a CP signal control circuit which is used for controlling the on-off of an input CPIN and an output CPOUT of a CP signal, and simulating the plugging of a charging gun; and the CC signal control circuit is used for controlling the on-off of the CC signal and the protected ground PE and confirming whether the charging gun is correctly connected or not. According to the utility model, through the effective design of the CP signal control circuit and the CC signal control circuit, the AC charging pile can be charged at any time by simulating the action of plugging and unplugging the charging gun, omitting manual operation and combining ordered charging management, and a scheme is provided for realizing reservation and timing charging of the AC charging pile.

Description

Technical Field

[0001] The utility model belongs to the field of orderly charging of AC charging piles, and in particular relates to an orderly charging control circuit of an AC charging pile. Background Art

[0002] In recent years, with the increasing popularity of new energy electric vehicles, more and more households in residential areas are installing AC charging piles. In addition, the number of charging piles built in parking lots, commercial offices and other areas is also increasing, and the demand for charging is increasing. The power supply capacity in these areas is limited, and the growth of charging demand affects normal power consumption and power supply safety. If the conventional disorderly charging management method is to fully meet the supply in terms of capacity, it will cause huge waste of power supply resources and it will be difficult to fully meet the growing demand for electric vehicle charging. Moreover, the large-scale access of electric vehicles is very likely to cause load tripping and even electrical safety accidents. Therefore, it is very important to be able to dynamically adjust the charging time and power according to the actual power demand of customers, shaving peaks and filling valleys, so that users can maximize the enjoyment of preferential electricity prices through orderly charging. Utility Model Content

[0003] In response to the above problems, the utility model proposes an orderly charging control circuit for an AC charging pile, which can cooperate with orderly charging management to enable the AC charging pile to dynamically adjust the charging time and power without manual operation, making charging simpler and faster.

[0004] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0005] An AC charging pile orderly charging control circuit, comprising:

[0006] The CP signal control circuit is used to control the on / off of the CP signal, that is, the on / off between the input CPIN and the output CPOUT of the CP signal, and includes a resistor R1, a resistor R2, a resistor R3, a capacitor C1, a transistor Q1, a MOS transistor Q2, a diode V1 and a relay K1; one end of the resistor R1 is connected to the power supply voltage VDD, and the other end is connected to the first input point A; the first input point A is used to receive the control signal YK_CP; one end of the resistor R2 is connected to the first input point A, and the other end is connected to the base of the transistor Q1; the emitter of the transistor Q1 is grounded, and the collector of the transistor Q1 is respectively connected to the power supply voltage VDD. One end of resistor R3 is connected to connection point B, and the other end of resistor R3 is connected to power supply voltage VDD; one end of capacitor C1 is connected to connection point B, and the other end is connected to the emitter of transistor Q1 and the source of MOS transistor Q2 respectively; the gate of MOS transistor Q2 is connected to connection point B, and the drain of MOS transistor Q2 is connected to the anode of diode V1 and coil pin 1 of relay K1 respectively; the cathode of diode V1 and coil pin 2 of relay K1 are both connected to relay operating voltage VCC, the common pin of relay K1 is connected to input CPIN, and the normally open contact pin of relay K1 is connected to output CPOUT;

[0007] The CC signal control circuit is used to control the on / off of the CC signal and the protective ground PE, and to confirm whether the charging gun is correctly connected.

[0008] Optionally, the CC signal control circuit includes: a resistor R4, a resistor R5, a resistor R6, a capacitor C2, a transistor Q3, a MOS transistor Q4, a diode V2 and a relay K2; one end of the resistor R4 is connected to the power supply voltage VDD, and the other end is connected to the second input point C; the second input point C is used to access the control signal YK_CC; one end of the resistor R5 is connected to the second input point C, and the other end is connected to the base of the transistor Q3; the emitter of the transistor Q3 is grounded, and the collector of the transistor Q3 is respectively connected to one end of the resistor R6 and the connection point D, and the resistor R The other end of 6 is connected to the power supply voltage VDD; one end of the capacitor C2 is connected to the connection point D, and the other end is connected to the emitter of the transistor Q3 and the source of the MOS transistor Q4 respectively; the gate of the MOS transistor Q4 is connected to the connection point D, and the drain of the MOS transistor Q4 is connected to the positive electrode of the diode V2 and the coil pin 1 of the relay K2 respectively. The cathode of the diode V2 and the coil pin 1 of the relay K2 are both connected to the relay operating voltage VCC. The common terminal pin of the relay K2 is connected to the protective ground PE, and the normally open contact pin of the relay K2 is connected to the CC signal for confirming the physical connection of the plug gun.

[0009] Optionally, the transistor Q1 and the transistor Q3 are both NPN transistors; and the MOS transistor Q2 and the MOS transistor Q4 are both NMOS transistors.

[0010] Optionally, the resistor R1, the resistor R3, the resistor R4 and the resistor R6 are all pull-up resistors, the resistor R2 and the resistor R5 are both current-limiting resistors, and the capacitor C1 and the capacitor C2 are both filter capacitors; the diode V1 is a freewheeling diode of the relay K1 coil, used to absorb the reverse voltage generated by the relay K1 coil to protect the relay K1; the diode V2 is a freewheeling diode of the relay K2 coil, used to absorb the reverse voltage generated by the relay K2 coil to protect the relay K2.

[0011] Optionally, when the control signal YK_CP is at a high level, the transistor Q1 is turned on, the collector of the transistor Q1 is at a low level, the gate of the MOS tube Q2 is at a low level, the MOS tube Q2 is cut off, and the relay K1 is disconnected, that is, the common terminal pin and the normally open contact pin of the relay K1 are disconnected, and the input CPIN and output CPOUT of the CP signal are disconnected, which is equivalent to the charging gun being unplugged.

[0012] Optionally, when the control signal YK_CP is at a low level, the transistor Q1 is cut off, the collector of the transistor Q1 is at a high level, the gate of the MOS tube Q2 is at a high level, the MOS tube Q2 is turned on, and the relay K1 is closed, that is, the common terminal pin and the normally open contact pin of the relay K1 are closed, and the input CPIN of the CP signal is connected to the output CPOUT, which is equivalent to the charging gun being inserted.

[0013] Optionally, when the control signal YK_CC is at a high level, the transistor Q3 is turned on, the collector of the transistor Q3 is at a low level, the gate of the MOS tube Q4 is at a low level, the MOS tube Q4 is cut off, and the relay K2 is disconnected, that is, the common terminal pin and the normally open contact pin of the relay K2 are disconnected, and the CC signal is not connected to the protective ground PE, which is equivalent to confirming that the charging gun is not connected.

[0014] Optionally, when the control signal YK_CC is at a low level, the transistor Q3 is cut off, the collector of the transistor Q3 is at a high level, the gate of the MOS tube Q4 is at a high level, the MOS tube Q4 is turned on, and the relay K2 is closed, that is, the common terminal pin and the normally open contact pin of the relay K2 are closed, and the CC signal is connected to the protective ground PE, which is equivalent to confirming that the charging gun has been connected.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The utility model provides an orderly charging control circuit for an AC charging pile, including a CP signal control circuit and a CC signal control circuit. Through the design of the CP signal control circuit and the CC signal control circuit, the action of plugging and unplugging a charging gun can be simulated, eliminating manual operation. Combined with orderly charging management, the AC charging pile can be charged at any time, providing a solution for realizing appointment and scheduled charging of the AC charging pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work, among which:

[0018] Figure 1 The figure shows the CP signal control circuit diagram in this embodiment;

[0019] Figure 2 Shown is the CC signal control circuit diagram in this embodiment. DETAILED DESCRIPTION

[0020] 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 embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may also include different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0022] In the description of this utility model, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of the terms "first" and "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0023] In the description of the present invention, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0024] The application principle of the present utility model is described in detail below with reference to the accompanying drawings. Example

[0025] The utility model provides an AC charging pile orderly charging control circuit, including: a CP signal (Control Pilot Function signal) control circuit and a CC signal (Charge Connection Confirmation signal) control circuit;

[0026] In this embodiment, if Figure 1 As shown, the CP signal control circuit includes resistor R1, resistor R2, resistor R3, capacitor C1, transistor Q1, MOS transistor Q2, diode V1 and relay K1;

[0027] Specifically, one end of the resistor R1 is connected to the power supply voltage VDD of the AC pile processor, and the other end is connected to the first input point A, and is connected to the control signal YK_CP of the CP signal output by the AC pile processor and the resistor R2; one end of the resistor R2 and the control signal YK_CP of the CP signal are respectively connected to the first input point A, and the other end of the resistor R2 is connected to the base of the transistor Q1; the emitter of the transistor Q1, one end of the capacitor C1 and the source of the MOS tube Q2 are commonly connected to the ground; the collector of the transistor Q1 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to the power supply voltage VDD of the AC pile processor VDD; the gate of MOS tube Q2 is connected to connection point B, the other end of capacitor C1 and the collector of transistor Q1 are connected to connection point B, and are connected to the gate of MOS tube Q2; the drain of MOS tube Q2 is connected to coil pin 1 (pin 1) of relay K1 and the positive electrode of diode V1 respectively; the cathode of diode V1 and coil pin 2 (pin 2) of relay K1 are connected to the relay operating voltage VCC; the common pin (pin 7) of relay K1 is connected to the input CPIN of CP signal, and the normally open contact pin (pin 12) of relay K1 is connected to the output CPOUT of CP signal.

[0028] Specifically, in this embodiment, the transistor Q1 is an NPN transistor, and the MOS transistor Q2 is an NMOS transistor; the resistors R1 and R3 are both pull-up resistors, used to stabilize the initial state of the circuit at a high level and improve the stability of the circuit; the resistor R2 is a current-limiting resistor, used to limit the current passing through the circuit, thereby protecting other components in the circuit from damage by excessive current; the capacitor C1 is a filter capacitor, used to filter out the AC component, making the output DC power smoother and more stable; the diode V1 is the freewheeling diode of the relay K1 coil, used to absorb the reverse voltage generated by the relay K1 coil, thereby protecting the relay K1.

[0029] Specifically, the relay K1 is a relay for converting small power. A coil is set between its pins 1 and 2. When a certain voltage exists at both ends of the coil, a certain current will flow through the coil, thereby generating an electromagnetic effect, causing the switch inside the relay K1 to close, that is, pins 7 and 12 are connected; on the contrary, if there is no certain voltage at both ends of the coil and the electromagnetic effect cannot be generated, the switch inside the relay K1 is opened under the action of spring force, that is, pins 7 and 11 (normally closed contact pins) of the relay K1 are connected, and pins 7 and 12 are not connected.

[0030] In this embodiment, if Figure 2 As shown, the CC signal control circuit includes resistor R4, resistor R5, resistor R6, capacitor C2, transistor Q3, MOS transistor Q4, diode V2 and relay K2;

[0031] Specifically, one end of the resistor R4 is connected to the power supply voltage VDD of the AC pile processor, and the other end is connected to the second input point C, and is connected to the control signal YK_CC of the CC signal output by the AC pile processor and the resistor R5; one end of the resistor R5 and the control signal YK_CC of the CC signal are respectively connected to the second input point C, and the other end of the resistor R5 is connected to the base of the transistor Q3; the emitter of the transistor Q3, one end of the capacitor C2 and the source of the MOS tube Q4 are commonly connected to the ground; the collector of the transistor Q3 is connected to one end of the resistor R6, and the other end of the resistor R6 is connected to the AC pile. The power supply voltage VDD of the processor is connected; the gate of MOS tube Q4 is connected to the connection point D, the other end of capacitor C2 and the collector of transistor Q3 are connected to the connection point D, and are connected to the gate of MOS tube Q4; the drain of MOS tube Q4 is connected to the coil pin 1 (pin 1) of relay K2 and the positive electrode of diode V2 respectively; the cathode of diode V2 and the coil pin 2 (pin 2) of relay K2 are connected to the relay operating voltage VCC; the common terminal pin (pin 7) of relay K2 is connected to the protective ground PE, and the normally open contact pin (pin 12) of relay K2 is connected to the CC signal.

[0032] Specifically, transistor Q3 is an NPN transistor, and MOS transistor Q4 is an NMOS transistor; resistors R4 and R6 are both pull-up resistors used to stabilize the initial state of the circuit at a high level and improve circuit stability; resistor R5 is a current-limiting resistor used to limit the current passing through the circuit, thereby protecting other components in the circuit from damage caused by excessive current; capacitor C2 is a filter capacitor used to filter out AC components to make the output DC power smoother and more stable; diode V2 is a freewheeling diode for the coil of relay K2, used to absorb the reverse voltage generated by the coil of relay K2 and thus protect relay K2.

[0033] Specifically, the relay K2 is a relay for converting small powers. A coil is provided between pins 1 and 2. When a certain voltage exists across the coil, a certain current flows through the coil, thereby generating an electromagnetic effect, closing the switch within the relay K2, that is, connecting pins 7 and 12. Conversely, if there is no certain voltage across the coil and the electromagnetic effect cannot be generated, the switch within the relay K2 opens under the action of the spring force, that is, connecting pin 7 of the relay K2 to the normally closed contact pin (pin 11), and blocking pins 7 and 12. Example

[0034] When charging an electric vehicle with an AC charging pile, the charging gun needs to be unplugged and plugged in each time. If charging is stopped in the middle, the charging gun must be unplugged and plugged in again to continue charging. Orderly charging management uses intelligent means to optimize and control the AC charging pile based on factors such as grid load conditions, charging demand, and electricity prices. It dynamically adjusts charging time and power according to the customer's actual electricity demand, shaving peaks and filling valleys, allowing users to maximize electricity price discounts. For the optimized control of the AC charging pile, it is required that the charging gun of the AC pile can adjust the charging time according to actual conditions after being inserted into the charging electric vehicle, without the need for human presence. The orderly charging control circuit of the AC charging pile provided by the utility model can be used to send control signals YK_CC and control signals YK_CP through the AC pile processor to control the on and off of relays K1 and K2, thereby realizing the simulation of plugging and unplugging the charging gun. The control process is as follows:

[0035] (1) Simulate the charging gun being pulled out

[0036] The control signal YK_CP of the CP signal output by the AC pile processor (main control CPU) is high, the base-emitter junction of the transistor Q1 is forward biased, the transistor Q1 is turned on, and the collector of the transistor Q1 is low. Since the collector of the transistor Q1 is low, the gate of the MOS transistor Q2 connected to the collector of the transistor Q1 is low, the MOS transistor Q2 is cut off, the coil in the relay K1 is de-energized (that is, the coil between pins 1 and 2 of the relay K1 is de-energized), the relay K1 is disconnected (that is, pins 7 and 12 of the relay K1 are disconnected), and the input CPIN and output CPOUT of the CP signal are disconnected, which is equivalent to the charging gun not being inserted (the charging gun is unplugged).

[0037] The control signal YK_CC of the CC signal output by the main control CPU of the AC pile is high, the base-emitter junction of the transistor Q3 is forward biased, the transistor Q3 is turned on, and the collector of the transistor Q3 is low; since the collector of the transistor Q3 is low, the gate of the MOS tube Q4 connected to the collector of the transistor Q3 is low, the MOS tube Q4 is cut off, the coil in the relay K2 is de-energized (that is, the coil between pins 1 and 2 of the relay K2 is de-energized), the relay K2 is disconnected (pins 7 and 12 of the relay K2 are disconnected), and the CC signal is disconnected from the protective ground PE, which is equivalent to the electric gun not being connected (the charging gun is unplugged).

[0038] (2) Simulate charging gun insertion

[0039] The control signal YK_CP of the CP signal output by the main control CPU of the AC pile is low, the base-emitter junction of the transistor Q1 is reverse biased, the transistor Q1 is cut off, and the collector of the transistor Q1 is high; since the collector of the transistor Q1 is high, the gate of the MOS tube Q2 connected to the collector of the transistor Q1 is high, the MOS tube Q2 is turned on, the coil in the relay K1 is energized (that is, the coil between pins 1 and 2 of the relay K1 is energized), the relay K1 is closed (pins 7 and 12 of the relay K1 are closed), the input CPIN of the CP signal is connected to the output CPOUT, which is equivalent to the charging gun being inserted.

[0040] The control signal YK_CC of the CC signal output by the main control CPU of the AC pile is low, the base-emitter junction of the transistor Q3 is reverse biased, the transistor Q3 is cut off, and the collector of the transistor Q3 is high; since the collector of the transistor Q3 is high, the gate of the MOS tube Q4 connected to the transistor Q3 is high, the MOS tube Q4 is turned on, the coil in the relay K2 is energized (that is, the coil between pins 1 and 2 of the relay K2 is energized), the relay K2 is closed (pins 7 and 12 of the relay K2 are closed), and the CC signal is connected to the protective ground PE, which is equivalent to confirming that the charging gun has been connected (charging gun is inserted).

[0041] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection content of the present invention.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. An AC charging pile orderly charging control circuit, characterized in that: include: The CP signal control circuit is used to control the on / off of the CP signal, that is, the on / off between the input CPIN and output CPOUT of the CP signal, simulating the plugging and unplugging of the charging gun, including resistor R1, resistor R2, resistor R3, capacitor C1, transistor Q1, MOS transistor Q2, diode V1 and relay K1; one end of the resistor R1 is connected to the power supply voltage VDD, and the other end is connected to the first input point A; the first input point A is used to access the control signal YK_CP; one end of the resistor R2 is connected to the first input point A, and the other end is connected to the base of the transistor Q1; the emitter of the transistor Q1 is grounded, and the collector of the transistor Q1 is grounded. The electrodes are respectively connected to one end of the resistor R3 and the connection point B, and the other end of the resistor R3 is connected to the power supply voltage VDD; one end of the capacitor C1 is connected to the connection point B, and the other end is respectively connected to the emitter of the transistor Q1 and the source of the MOS transistor Q2; the gate of the MOS transistor Q2 is connected to the connection point B, and the drain of the MOS transistor Q2 is respectively connected to the anode of the diode V1 and the coil pin 1 of the relay K1; the cathode of the diode V1 and the coil pin 2 of the relay K1 are both connected to the relay operating voltage VCC, the common terminal pin of the relay K1 is connected to the input CPIN, and the normally open contact pin of the relay K1 is connected to the output CPOUT; The CC signal control circuit is used to control the on / off of the CC signal and the protective ground PE, and to confirm whether the charging gun is correctly connected.

2. The AC charging pile orderly charging control circuit according to claim 1, characterized in that: The CC signal control circuit includes: a resistor R4, a resistor R5, a resistor R6, a capacitor C2, a transistor Q3, a MOS transistor Q4, a diode V2 and a relay K2; one end of the resistor R4 is connected to the power supply voltage VDD, and the other end is connected to the second input point C; the second input point C is used to receive the control signal YK_CC; one end of the resistor R5 is connected to the second input point C, and the other end is connected to the base of the transistor Q3; the emitter of the transistor Q3 is grounded, and the collector of the transistor Q3 is connected to one end of the resistor R6 and the connection point D respectively. The other end is connected to the power supply voltage VDD; one end of the capacitor C2 is connected to the connection point D, and the other end is respectively connected to the emitter of the transistor Q3 and the source of the MOS transistor Q4; the gate of the MOS transistor Q4 is connected to the connection point D, and the drain of the MOS transistor Q4 is respectively connected to the positive electrode of the diode V2 and the coil pin 1 of the relay K2. The cathode of the diode V2 and the coil pin 1 of the relay K2 are both connected to the relay operating voltage VCC. The common terminal pin of the relay K2 is connected to the protective ground PE, and the normally open contact pin of the relay K2 is connected to the CC signal to confirm the physical connection of the plug gun.

3. The AC charging pile orderly charging control circuit according to claim 2, characterized in that: The transistor Q1 and the transistor Q3 are both NPN transistors; the MOS transistor Q2 and the MOS transistor Q4 are both NMOS transistors.

4. The AC charging pile orderly charging control circuit according to claim 3, characterized in that: The resistors R1, R3, R4 and R6 are all pull-up resistors, the resistors R2 and R5 are both current-limiting resistors, and the capacitors C1 and C2 are both filter capacitors; the diode V1 is a freewheeling diode of the relay K1 coil, used to absorb the reverse voltage generated by the relay K1 coil to protect the relay K1; the diode V2 is a freewheeling diode of the relay K2 coil, used to absorb the reverse voltage generated by the relay K2 coil to protect the relay K2.

5. The AC charging pile orderly charging control circuit according to claim 4, characterized in that: When the control signal YK_CP is at a high level, the transistor Q1 is turned on, the collector of the transistor Q1 is at a low level, the gate of the MOS tube Q2 is at a low level, the MOS tube Q2 is cut off, and the relay K1 is disconnected, that is, the common terminal pin and the normally open contact pin of the relay K1 are disconnected, and the input CPIN and output CPOUT of the CP signal are disconnected, which is equivalent to the charging gun being unplugged.

6. The AC charging pile orderly charging control circuit according to claim 4, characterized in that: When the control signal YK_CP is at a low level, the transistor Q1 is cut off, the collector of the transistor Q1 is at a high level, the gate of the MOS tube Q2 is at a high level, the MOS tube Q2 is turned on, and the relay K1 is closed, that is, the common terminal pin and the normally open contact pin of the relay K1 are closed, and the input CPIN of the CP signal is connected to the output CPOUT, which is equivalent to the charging gun being inserted.

7. The AC charging pile orderly charging control circuit according to claim 4, characterized in that: When the control signal YK_CC is high, the transistor Q3 is turned on, the collector of the transistor Q3 is low, the gate of the MOS tube Q4 is low, the MOS tube Q4 is cut off, and the relay K2 is disconnected, that is, the common terminal pin and the normally open contact pin of the relay K2 are disconnected, and the CC signal is disconnected from the protective ground PE, which is equivalent to the charging gun not being connected.

8. The AC charging pile orderly charging control circuit according to claim 4, characterized in that: When the control signal YK_CC is at a low level, the transistor Q3 is cut off, the collector of the transistor Q3 is at a high level, the gate of the MOS tube Q4 is at a high level, the MOS tube Q4 is turned on, and the relay K2 is closed, that is, the common terminal pin and the normally open contact pin of the relay K2 are closed, and the CC signal is connected to the protective ground PE, which is equivalent to confirming that the charging gun has been connected.

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