The circuit of AC charging pile enabling CC signal through CP signal

Abstract

The present invention relates to a circuit used on an AC charging pile, which can simulate the effect of plugging and unplugging a charging gun when the gun is plugged in, so that the AC charging pile can adapt to more working conditions during use and have more diagnostic capabilities. The circuit of the present invention is mainly composed of common devices such as triodes, capacitors, diodes, resistors, etc., and has the advantages of simple circuit, low cost, easy implementation, etc., and is very easy to promote and use.

Description

Technical Field

[0001] The invention belongs to the field of charging piles, and is mainly used to solve the action of simulating the pulling out and inserting of a gun by the charging pile, so as to provide the charging pile with higher adaptability. Background Art

[0002] As the country vigorously promotes the use of new energy vehicles, more and more new energy vehicles are entering the lives of many ordinary people. With the increasing number of new energy vehicles, there are more and more AC charging piles used in families and society. Many new energy vehicles need to put the charging interface into sleep mode during normal use, but they will encounter some problems when waking up the charging interface, which will cause the charging pile to be unable to charge smoothly. Manual intervention is required to re-plug the charging gun. Since the charging gun circuit is uniformly stipulated by the standard, this situation is relatively common. The present invention is to solve this problem, so that the charging pile can simulate the plugging and unplugging of the charging gun without human intervention, so that charging can proceed normally. Summary of the invention

[0003] The purpose of the present invention is to provide a method for simulating the action of plugging and unplugging the AC charging pile gun, and this purpose is achieved by modifying the circuit on the AC charging gun and controlling the output of the CP signal.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] Refer to the standard circuit of AC charging pile (attached Figure 2 ),

[0006] The anode of the diode D1 is connected to CP, the cathode of the diode D1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to PE; disconnect the attached Figure 2 The connection between the connection points S3 and R4 and PE is achieved by connecting the collector of the transistor Q1 to S3, the emitter of the transistor Q1 to PE, the resistors R1 and R2 are connected in series and then connected in parallel with the capacitor C1, one end of the resistor R3 is connected to the connection point between R1 and R2, and the other end is connected to the base of the transistor Q1.

[0007] See the instructions for connection details. Figure 1 shown.

[0008] Working principle of the circuit:

[0009] CP is a positive voltage or a PWM signal with a positive and negative alternating frequency of 1kHz. When the CP voltage is positive or in a positive cycle, CP charges the capacitor C1 through the diode D1. When the CP voltage is negative or in a negative cycle, the capacitor C1 discharges through the resistors R1 and R2. R1 and R2 form a voltage divider circuit to generate a voltage signal V on R3. The voltage signal V can maintain the transistor Q1 in a conducting state; when the conduction time of the transistor Q1 is greater than the CP negative voltage cycle, the transistor will remain on all the time. At this time, it is equivalent to the connection points S3 and R4 being connected to PE. This situation is consistent with the normal charging pile gun plugging state, so the charging gun plugging state can be simulated; when the control CP signal is at a negative voltage for a long time, C1 is discharged, the base voltage of the transistor Q1 is 0, and the transistor Q1 is turned off. At this time, CC is not conducting to PE, which is consistent with the state of the normal charging pile gun being pulled out, so the state of the charging gun being pulled out can be simulated.

[0010] Preferably, the CP signal is a circuit that can control the duty cycle to be 0. When the duty cycle of the CP signal cannot be 0, a circuit that controls the CP signal to be less than or equal to 0V should be added. This circuit is not within the scope of the present invention and is therefore omitted;

[0011] Preferably, the time length of the capacitor C1 discharging through R1 and R2 is greater than 1 ms and less than 100 ms.

[0012] Preferably, the duration of CP being a negative voltage signal is controlled to be greater than 1 second to simulate the state of the charging gun being pulled out. Preferably, the transistor Q1 may be a switching device with a small driving current, such as a MOS tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the circuit described in the present invention.

[0014] Figure 2 It is the circuit of the standard AC charging pile charging gun interface (GB / T18487.1 Figure A.3).

[0015] Due to the use of the above circuit, it can not only fully comply with the national standard requirements for the charging gun interface circuit, but also simulate the action of unplugging and replugging the charging gun when necessary; the plugging and unplugging action of the charging gun can reset the charging pile and car interface status data, avoiding the abnormal state affecting the charging of the car by the charging pile, making the AC charging pile system more robust and improving the applicability of the charging pile. The circuit of the present invention is simple and easy to implement, and has a high promotion significance. DETAILED DESCRIPTION

[0016] The following is combined with Figure 1 The illustrated embodiment further describes the circuit of the present invention.

[0017] Attached Figure 1The circuit is located inside the AC charging gun. Figure 2 See the "Vehicle Connector" section in the "Vehicle Interface" section.

[0018] The positive electrode of the diode D1 is connected to the CP line, and the negative electrode of the diode D1 is connected to the energy storage capacitor C1. The capacitance of C1 is relatively small to meet the requirements of the rising and falling edges of the CP signal; the resistors R1 and R2 are large-value resistors to meet the requirements of the interface impedance; the transistor Q1 is an N-channel MOS tube, and the resistor R3 can be omitted at this time. The gate of the MOS tube is directly connected to the connection point of R1 and R2, the source of the MOS tube is connected to PE, and the drain of the MOS tube is connected to the connection point of the standard circuit S3 and R4.

[0019] When the AC charging gun is plugged in, the CP signal is controlled to be negative 12V and maintained for more than 1s. At this time, the gate voltage of the MOS tube is lower than the MOS tube start-up voltage requirement, and the MOS tube is disconnected. At the vehicle end, it will show a signal of "no CC connection", which simulates the gun-pulling state. When the CP signal is restored to a positive and negative PWM signal of 1kHz, the gate voltage of the MOS tube can be always maintained above the voltage that can turn on the MOS tube, so that the MOS tube is turned on, so that the CC circuit (S3, R4, RC) is normally connected, and the "CC connection" signal will be detected at the vehicle end, and the normal plug-in state is restored.

[0020] In the above embodiment, the circuit is simple and all installed in the charging gun. There is no need to change the cables between the charging gun and the charging pile control board. Only CP, PE, L, and N four-core cables are required, and the implementation cost is very small. The above embodiment is only to illustrate the technical concept and features of the present invention. Its purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the scope of protection of the present invention. Any equivalent changes, cuts or modifications made according to the spirit of the circuit described in the present invention should be covered within the scope of protection of the present invention.

Claims

1. A circuit for simulating plugging and unplugging a charging gun when an AC charging pile is plugged in, characterized in that: The circuit is mainly composed of a diode D1, a capacitor C1, a transistor Q1 and resistors R1, R2 and R3; the positive electrode of the diode D1 is connected to the CP signal line, the negative electrode of the diode D1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the PE signal line; the connection between the S3 and R4 connection points and the PE signal line is disconnected, the collector of the transistor Q1 is connected to S3, the emitter of the transistor Q1 is connected to the PE signal line, the resistors R1 and R2 are connected in series and then connected in parallel with the capacitor C1, one end of the resistor R3 is connected to the connection point between R1 and R2, and the other end is connected to the base of the transistor Q1; CP is a positive voltage or a PWM signal with a positive and negative alternating frequency of 1kHz. When the CP voltage is positive or in a positive cycle, CP charges the capacitor C1 through the diode D1. When the CP voltage is negative or in a negative cycle, the capacitor C1 discharges through the resistors R1 and R2. R1 and R2 form a voltage divider circuit to generate a voltage signal V on R3. The voltage signal V can maintain the transistor Q1 in a conducting state; when the conduction time of the transistor Q1 is greater than the CP negative voltage cycle, the transistor will remain on all the time. At this time, it is equivalent to the connection points S3 and R4 being connected to PE. This situation is consistent with the normal charging pile plug-in state, simulating the charging gun plug-in state; when the control CP signal is at a negative voltage for a long time, C1 is discharged, the base voltage of the transistor Q1 is 0, and the transistor Q1 is turned off. At this time, CC is not conductive to PE, which is consistent with the state of the normal charging pile pulling out the gun, simulating the state of the charging gun being pulled out.

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