CP handshake connection circuit of AC charging pile of new energy automobile

Abstract

The utility model discloses a CP handshake connection circuit of an alternating current charging pile of a new energy automobile. The positive electrode of the light-emitting end of the optical coupler U8 receives the starting voltage, the other end of the optical coupler U8 is used for being connected with an MCU so as to receive a PWM signal, the collector electrode of the optical coupler U8 receives a voltage, and the emitter electrode of the optical coupler U8 is connected with the grid electrodes of the MOS tube Q2N and the MOS tube Q5; the source electrode of the MOS tube Q2N is connected with the source electrode of the MOS tube Q5, the drain electrode of the MOS tube Q2N is connected with the positive electrode of the voltage, the drain electrode of the MOS tube Q5 is connected with the negative electrode of the voltage, and the source electrode of the MOS tube Q2N is connected with the CP terminal; the source electrode of the MOS tube Q2N is further connected with the normal phase end of the follower U2 through a diode D4, and the reverse phase end of the follower U2 is connected with the output end and used for feeding back signals to the MCU. The utility model is applied to a 7KW alternating current charging pile CP circuit and generation of a charging and automobile handshake signal, and particularly relates to a new energy automobile charging handshake connection circuit which can identify whether a vehicle is in a charging state or a connection state with a charging pile, the connection state represents that the vehicle can be charged, and the disconnection represents that the vehicle cannot be charged.

Description

Technical Field

[0001] This utility model relates to the field of new energy vehicle charging, and in particular to a CP handshake connection circuit for AC charging piles of new energy vehicles. Background Technology

[0002] Existing new energy vehicle charging piles cannot generate a handshake signal after being connected to the vehicle, making it impossible to effectively detect whether the connection has been established. Utility Model Content

[0003] To address the aforementioned issues, this technical solution provides a CP handshake connection circuit for AC charging piles for new energy vehicles.

[0004] To achieve the above objectives, the technical solution is as follows:

[0005] A CP handshake connection circuit for an AC charging pile for new energy vehicles, comprising:

[0006] Optocoupler U8 has a positive terminal that receives a startup voltage and a other terminal that is connected to an MCU to receive a PWM signal. The collector of optocoupler U8 receives a voltage, and the emitter is connected to the gate of MOSFET Q2N and MOSFET Q5.

[0007] The source of the MOSFET Q2N is connected to the source of the MOSFET Q5, the drain of the MOSFET Q2N is connected to the positive terminal of the voltage, the drain of the MOSFET Q5 is connected to the negative terminal of the voltage, and the source of the MOSFET Q2N is connected to the CP terminal.

[0008] The source of the MOS transistor Q2N is also connected to the non-inverting terminal of the follower U2 through diode D4. The inverting terminal of the follower U2 is connected to the output terminal to provide feedback signals to the MCU.

[0009] In some embodiments, the voltage is +12V.

[0010] In some embodiments, the negative terminal of the light-emitting end of the optocoupler U8 is connected to a resistor R13.

[0011] In some embodiments, the emitter of the optocoupler U8 is connected to the MOSFET Q2N and MOSFET Q5 through resistors R17 and R18, respectively. Resistor R17 is also connected to the diode D4 through resistor R14, and resistor R18 is also connected to the negative terminal of the voltage through resistor R15.

[0012] In some embodiments, the diode D4 is grounded via resistors R16 and R19 in sequence.

[0013] In some embodiments, the output of the follower U2 is connected to a diode D3.

[0014] In some embodiments, the diode D3 is grounded through capacitor C13, resistor R20 and electrolytic capacitor C21 respectively.

[0015] The beneficial effects of this application are:

[0016] This application is applied to the CP circuit of a 7KW AC charging pile and the generation of charging and vehicle handshake signals. Specifically, it is a charging handshake connection circuit for new energy vehicles that can identify whether the vehicle is in a charging state or a connected state with the charging pile. A connected state indicates that charging is possible, while a disconnected state indicates that charging is not possible. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0018] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model. Detailed Implementation

[0019] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] Please refer to Figure 1 As shown, a CP handshake connection circuit for an AC charging pile for new energy vehicles includes:

[0021] Optocoupler U8 has a positive terminal that receives a startup voltage and a other terminal that is connected to an MCU to receive a PWM signal. The collector of optocoupler U8 receives a voltage, and the emitter is connected to the gate of MOSFET Q2N and MOSFET Q5.

[0022] The source of the MOSFET Q2N is connected to the source of the MOSFET Q5, the drain of the MOSFET Q2N is connected to the positive terminal of the voltage, the drain of the MOSFET Q5 is connected to the negative terminal of the voltage, and the source of the MOSFET Q2N is connected to the CP terminal.

[0023] The source of the MOS transistor Q2N is also connected to the non-inverting terminal of the follower U2 through diode D4. The inverting terminal of the follower U2 is connected to the output terminal to provide feedback signals to the MCU.

[0024] In some embodiments, the voltage is +12V.

[0025] Specifically, this application is based on the control and guidance circuits for charging modes 2 and 3, i.e., the vehicle confirmation handshake circuits, according to GB / T 18487.1-2015 Electric Vehicle Conductive Charging Systems Part 1: General Requirements. Figure 1 The principle behind this is that the MCU generates PWM pulses according to the pulse width specified in the diagram below. Figure 1 Q2N and Q5 generate positive and negative 12V PWM pulses to the CP terminal, while another portion passes through D4 to the op-amp U2 follower and then feeds back to the MCU AD1 pin. When the CP terminal is connected to the vehicle, the vehicle identifies whether it is in a charging or connected state based on the 6V or 9V voltage fed back by the vehicle. A connected state indicates that charging is possible, while a disconnected state indicates that charging is not possible.

[0026] The circuit in this application is simple, stable, easy to debug, and conforms to the GB / T18478-2015 standard.

[0027] In some embodiments, the negative terminal of the light-emitting end of the optocoupler U8 is connected to a resistor R13.

[0028] In some embodiments, the emitter of the optocoupler U8 is connected to the MOSFET Q2N and MOSFET Q5 through resistors R17 and R18, respectively. Resistor R17 is also connected to the diode D4 through resistor R14, and resistor R18 is also connected to the negative terminal of the voltage through resistor R15.

[0029] In some embodiments, the diode D4 is grounded via resistors R16 and R19 in sequence.

[0030] In some embodiments, the output of the follower U2 is connected to a diode D3.

[0031] In some embodiments, the diode D3 is grounded through capacitor C13, resistor R20 and electrolytic capacitor C21 respectively.

[0032] The above description is only a preferred embodiment of this application and is not intended to limit the scope of implementation of this application. Any other embodiments whose principles and basic structures are the same as or similar to those of this application are within the protection scope of this application.

Claims

1. A new energy vehicle alternating current charging pile CP handshake connection circuit, characterized in that, include; Optocoupler U8 has a positive terminal that receives a startup voltage and a other terminal that is connected to an MCU to receive a PWM signal. The collector of optocoupler U8 receives a voltage, and the emitter is connected to the gate of MOSFET Q2N and MOSFET Q5. The source of the MOSFET Q2N is connected to the source of the MOSFET Q5, the drain of the MOSFET Q2N is connected to the positive terminal of the voltage, the drain of the MOSFET Q5 is connected to the negative terminal of the voltage, and the source of the MOSFET Q2N is connected to the CP terminal. The source of the MOS transistor Q2N is also connected to the non-inverting terminal of the follower U2 through diode D4. The inverting terminal of the follower U2 is connected to the output terminal to provide feedback signals to the MCU.

2. The new energy vehicle alternating current charging pile CP handshake connection circuit according to claim 1, characterized in that: The voltage is +12V.

3. The new energy vehicle alternating current charging pile CP handshake connection circuit according to claim 2, characterized in that: The negative terminal of the light-emitting end of the optocoupler U8 is connected to a resistor R13.

4. The new energy vehicle alternating current charging pile CP handshake connection circuit according to claim 3, characterized in that: The emitter of the optocoupler U8 is connected to the MOSFET Q2N and MOSFET Q5 through resistors R17 and R18, respectively. Resistor R17 is also connected to the diode D4 through resistor R14, and resistor R18 is also connected to the negative terminal of the voltage through resistor R15.

5. The new energy vehicle alternating current charging pile CP handshake connection circuit according to claim 1, characterized in that: The diode D4 is grounded in sequence through resistors R16 and R19.

6. The CP handshake connection circuit for a new energy vehicle AC charging pile according to claim 1, characterized in that: The output terminal of the follower U2 is connected to a diode D3.

7. The new energy vehicle alternating current charging pile CP handshake connection circuit according to claim 6, characterized in that: The diode D3 is grounded through capacitor C13, resistor R20 and electrolytic capacitor C21 respectively.

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