Vehicle end diode detection circuit

Abstract

The utility model provides a vehicle end diode detection circuit, which comprises a standby controller and a detection circuit, the equipment controller comprises a U1A, a positive power interface of the U1A is connected with + 12V voltage, a negative power interface of the U1A is connected with-12V voltage, an inverted input end of the U1A is connected with a resistor R2, the other end of the resistor R2 is connected with 3.3 V voltage, the inverted input end of the U1A is connected with a resistor R1, the other end of the resistor R1 is grounded, and the detection circuit is connected with the standby controller. And the voltage is 3.3 V, the R2 and the R1 provide reference voltage for the U1A, and the normal phase input end of the U1A is connected with a resistor R3. The arrangement of the equipment controller and the detection circuit is beneficial to detecting whether the vehicle end diode D1 of the electric vehicle exists or not.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle charging technology, and in particular relates to a vehicle-side diode detection circuit. Background Technology

[0002] The national standard for conductive charging systems for electric vehicles (GB / T 18487.1-2023) officially came into effect in April 2024. The standard addresses various problems and potential issues with existing charging stations, focusing on additional regulations regarding safety and reliability. Specifically, section A.2.6 explicitly states that "before energy transfer, the power supply equipment should be able to verify that the connected device is an electric vehicle and not a load device by detecting the presence of diode D1 on the control and guidance circuit." This requirement was not present in GB / T18487.1-2015. Therefore, currently, when charging electric vehicles through charging stations, it is inconvenient to detect the presence of the diode in the control and guidance circuit within the electric vehicle. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a vehicle-end diode detection circuit that can detect the presence of diodes in the control and guidance circuit of an electric vehicle.

[0004] This utility model is achieved through the following technical solution:

[0005] A vehicle-end diode detection circuit includes a device controller and a detection circuit. The device controller includes U1A, whose positive power interface is connected to a +12V voltage, and whose negative power interface is connected to a -12V voltage. A resistor R2 is connected to the inverting input terminal of U1A, and the other end of resistor R2 is connected to a 3.3V voltage. A resistor R1 is also connected to the inverting input terminal of U1A, and the other end of resistor R1 is grounded. The 3.3V voltage, R2, and R1 provide a reference voltage for U1A. A resistor R3 is connected to the non-inverting input terminal of U1A. The other end is connected to the CP_MCU pulse signal. The output of U1A outputs the CP signal through resistor R4. CP_MCU is the main MCU output, and CP is the CP output of the power supply device. Diodes D1B and D1A are connected between the output of U1A and resistor R4. The negative terminal of D1B is connected to 12.0V voltage, and the positive terminal of D1A is connected to -12V voltage. When CP_MCU is high, CP outputs a high level (12V), and when CP_MCU is low, CP outputs a low level (-12V).

[0006] Preferably, the detection circuit includes U2A. The non-inverting input of U2A is grounded through resistor R10, and the inverting input of U2A is connected to the pulse signal CP through resistor R8. A resistor R9 is connected between the inverting input and the output of U2A. The positive power supply interface of U2A is connected to +12V, and the negative power supply interface of U2A is connected to -12V. The output of U2A outputs a D-CHK signal through diode D4 and resistor R11. A capacitor C2 is connected between diode D4 and R11, and the other end of capacitor C2 is grounded. A resistor R12 and a capacitor C3 are connected in parallel between the output of R11 and the ground terminal GND. R8, R9, R10, and U2A constitute an inverting proportional amplifier. D4 is used to remove the negative voltage at point A. C2, R11, R12, and C3 form a filter circuit and a voltage limiting circuit.

[0007] Preferably, the pulse signal CP is the CP signal output from the output terminal of U1A through resistor R4.

[0008] Compared with the prior art, the beneficial effects of the present invention are:

[0009] 1. In this utility model, the device controller and detection circuit are designed to facilitate the detection of the presence of the vehicle-end diode D1 in an electric vehicle. Attached Figure Description

[0010] Figure 1 This is the circuit diagram of the device controller of this utility model.

[0011] Figure 2 This is a circuit diagram of the detection circuit of this utility model.

[0012] Figure 3 This is a schematic diagram of the structure of the device controller and detection circuit of this utility model. Detailed Implementation

[0013] The present invention will now be described in detail with reference to the accompanying drawings, as shown below. Figure 1As shown, a vehicle-side diode detection circuit includes a device controller and a detection circuit. The device controller includes U1A. The positive power interface of U1A is connected to a +12V voltage, and the negative power interface of U1A is connected to a -12V voltage. A resistor R2 is connected to the inverting input terminal of U1A, and the other end of the resistor R2 is connected to a 3.3V voltage. A resistor R1 is connected to the inverting input terminal of U1A, and the other end of the resistor R1 is grounded. The 3.3V, R2, and R1 provide a reference voltage for U1A. A resistor R3 is connected to the non-inverting input terminal of U1A. The other end of R3 is connected to the CP_MCU pulse signal. The output of U1A outputs the CP signal through resistor R4. CP_MCU is the main MCU output, and CP is the CP output of the power supply device. Diodes D1B and D1A are connected between the output of U1A and resistor R4. The negative terminal of D1B is connected to a 12.0V voltage, and the positive terminal of D1A is connected to a -12V voltage. When CP_MCU is high, CP outputs a high level (12V), and when CP_MCU is low, CP outputs a low level (-12V).

[0014] In this implementation plan, in conjunction with the appendix Figure 2 As shown, the detection circuit includes U2A. The non-inverting input of U2A is grounded through resistor R10, and the inverting input of U2A is connected to the pulse signal CP through resistor R8. Resistor R9 is connected between the inverting input and the output of U2A. The positive power supply interface of U2A is connected to +12V, and the negative power supply interface is connected to -12V. The output of U2A outputs the D-CHK signal through diode D4 and resistor R11. Capacitor C2 is connected between diode D4 and R11, and the other end of capacitor C2 is grounded. Resistor R12 and capacitor C3 are connected in parallel between the output of R11 and ground GND. R8, R9, R10, and U2A constitute an inverting proportional amplifier. D4 is used to remove the negative voltage at point A. C2, R11, R12, and C3 form a filter circuit and a voltage limiting circuit.

[0015] In this embodiment, specifically, the pulse signal CP is the CP signal output from the output terminal of U1A through resistor R4.

[0016] In this implementation plan, in conjunction with the appendix Figure 3As shown, an on-line control and protection device and a vehicle interface are installed between the electric vehicle and the standard plug. The L and N lines of the on-board charger inside the electric vehicle are connected to the standard plug through the vehicle socket and vehicle plug inside the vehicle interface, and the RCD in the on-line control and protection device. Switches C1 and C2 are respectively installed on the L and N lines of the on-board charger and the RCD. The grounding terminal of the standard plug and the grounding terminal of the on-board charger are both connected to the vehicle ground through the PE line. The device controller is located in the on-line control and protection device. The pulse signal CP output by the on-line control and protection device is divided into three branches after passing through the vehicle-end diode D1 inside the electric vehicle. One branch is connected to the vehicle controller, the second branch is connected to the vehicle ground through the resistor R2 in the vehicle internal control guide circuit, and the third branch is connected to the vehicle ground through the resistor R3 in the vehicle internal control guide circuit and the vehicle internal control guide switch S2. The PE line of the standard plug is connected to the vehicle controller through S3 and RC, where R3 is connected in parallel with R4.

[0017] In this implementation scheme, specifically, the microcontroller ADC port in the D_CHK access cable control and protection device determines whether the vehicle-end diode D1 exists.

[0018] Working principle

[0019] In this invention, the ADC port of the microcontroller in the cable control and protection device can detect the presence of vehicle-end diode D1 by detecting the waveform of D_CHK.

[0020] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution of this utility model, falls within the protection scope of this utility model.

Claims

1. A vehicle-end diode detection circuit, characterized in that, The vehicle-side diode detection circuit includes a device controller and a detection circuit. The device controller includes U1A. The positive power interface of U1A is connected to a +12V voltage, and the negative power interface of U1A is connected to a -12V voltage. A resistor R2 is connected to the inverting input terminal of U1A, and the other end of resistor R2 is connected to a 3.3V voltage. A resistor R1 is also connected to the inverting input terminal of U1A, and the other end of resistor R1 is grounded. The 3.3V voltage, R2, and R1 provide a reference voltage for U1A. A resistor R3 is connected to the non-inverting input terminal of U1A, and the other end of resistor R3 is connected to CP_. The MCU pulse signal is output through resistor R4 at the output terminal of U1A. CP_MCU is the main MCU output terminal, and CP is the CP output of the power supply device. Diodes D1B and D1A are connected between the output terminal of U1A and resistor R4. The negative terminal of D1B is connected to a 12.0V voltage, and the positive terminal of D1A is connected to a -12V voltage. When CP_MCU is high, CP outputs a high level with a voltage value of 12V. When CP_MCU is low, CP outputs a low level with a voltage value of -12V.

2. The vehicle-end diode detection circuit as described in claim 1, characterized in that, The detection circuit includes U2A. The non-inverting input of U2A is grounded through resistor R10. The inverting input of U2A is connected to the pulse signal CP through resistor R8. Resistor R9 connects the inverting input and output of U2A. The positive power supply interface of U2A is connected to +12V, and the negative power supply interface is connected to -12V. The output of U2A outputs a D-CHK signal through diode D4 and resistor R11. Capacitor C2 is connected between diode D4 and R11, with the other end of capacitor C2 grounded. Resistor R12 and capacitor C3 are connected in parallel between the output of R11 and ground (GND). R8, R9, R10, and U2A constitute an inverting proportional amplifier. VA = - VCP and D4 are used to remove the negative voltage at point A. C2, R11, R12, and C3 form a filter circuit and a voltage limiting circuit. VD_CHK= .

3. The vehicle-end diode detection circuit as described in claim 1, characterized in that, The pulse signal CP is the CP signal output from the output terminal of U1A through resistor R4.

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