A charging pile with automatic power on and off function

Abstract

The utility model discloses a charging pile with automatic on / off function, comprising a power module, an MCU, an LCD and a peripheral interface, wherein the MCU is electrically connected to the power module, the LCD is electrically connected to the power module and the MCU, and the peripheral interface is electrically connected to the power module and the MCU. The utility model relates to the field of charging pile design, and specifically refers to a charging pile with automatic on / off function.

Description

Technical Field

[0001] The utility model relates to the field of charging pile design, in particular to a charging pile with automatic power on and off functions. Background Art

[0002] Electric vehicles are vehicles that use an onboard power source as a driving force, use an electric motor to drive the wheels, and comply with various requirements of road traffic and safety regulations. The working principle is as follows: battery - current - power regulator - motor - power transmission system - drive the vehicle. As the impact on the environment is relatively small compared to traditional vehicles, its prospects are widely optimistic.

[0003] A charging pile is a tool for charging electric vehicles. Currently, there are few circuit designs that have charging parameter detection and display functions. This design proposes a charging pile with automatic power on and off functions, with display and control functions. Utility Model Content

[0004] The technical problem to be solved by the utility model is that there are few charging parameter detection and display functions in current circuit design.

[0005] To solve the above problems, the technical solution adopted by the utility model is as follows: The utility model is a charging pile with automatic power on and off function, including a power module, an MCU, an LCD and a peripheral interface, the MCU is electrically connected to the power module, the LCD is electrically connected to the power module and the MCU, and the peripheral interface is electrically connected to the power module and the MCU.

[0006] Furthermore, the peripheral interface includes PWM, CP detection, voltage and current detection and relay control, the PWM is electrically connected between the power module and the MCU, the CP detection is electrically connected between the power module and the MCU, the voltage and current detection is electrically connected between the power module and the MCU, and the relay control is electrically connected between the power module and the MCU.

[0007] Furthermore, the MCU detects the voltage on the CP detection line through AD conversion.

[0008] Furthermore, the PWM output duty cycle is 48%.

[0009] Furthermore, the LCD is controlled by SPI communication of the MCU.

[0010] Preferably, when the voltage on the CP detection line is 9 volts, it is determined that the charging gun has been inserted into the car charging port.

[0011] The beneficial effects achieved by the utility model using the above structure are as follows: through the cooperation of power module, MCU, LCD, PWM, CP detection, voltage and current detection and relay control, it can determine whether the gun body is inserted, can automatically turn on and off the power, and has a display function. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the overall module structure of a charging pile circuit with automatic power on and off function proposed by the utility model;

[0013] Figure 2 This is a circuit diagram of a charging pile with automatic power on and off function proposed by the utility model;

[0014] Figure 3 This is a PWM and CP detection circuit diagram of a charging pile with automatic power on and off function proposed by the utility model;

[0015] Figure 4 This is a charging pile MCU circuit diagram with automatic power on and off function proposed by the utility model;

[0016] Figure 5 This is a circuit diagram of a charging pile power module with automatic power on and off function proposed by the utility model;

[0017] Figure 6 This is a voltage and current detection circuit diagram of a charging pile with automatic power on and off function proposed by the utility model. DETAILED DESCRIPTION

[0018] like Figure 1 to Figure 6 As shown, the utility model is a charging pile with automatic power on and off function, including a power module, an MCU, an LCD and a peripheral interface, the MCU is electrically connected to the power module, the LCD is electrically connected to the power module and the MCU, the peripheral interface is electrically connected to the power module and the MCU, the peripheral interface includes PWM, CP detection, voltage and current detection and relay control, PWM is electrically connected to the power module and the MCU, CP detection is electrically connected to the power module and the MCU, voltage and current detection is electrically connected to the power module and the MCU, and relay control is electrically connected to the power module and the MCU.

[0019] When the MCU detects that the voltage on the CP detection line is 9 volts through AD conversion, it determines that the charging gun has been inserted into the car's charging port.

[0020] When the MCU detects that the voltage on the CP detection line is 9 volts through AD conversion (the voltage is 12 volts when the gun is not inserted), it is determined that the gun has been inserted into the car charging port. At this time, the MCU generates a 1000HZ PWM wave with a duty cycle of 48% on the CP detection line. After the car detects the PWM waveform, it sets its own charging power (3.2KW) according to the duty cycle, and further reduces the voltage of the CP detection line to 6 volts. When the MCU of the charging pile detects that the voltage of the CP detection line is 6 volts, the relay is turned on to provide 220 volts of AC to the car, and the car starts charging. During charging, the MCU reads the BL0942 chip through the serial port to monitor the charging voltage, current, power, power and other data in real time. When overvoltage, undervoltage and overcurrent are found, the relay is disconnected in time and charging is stopped to protect the car from damage; when the charging current is detected to be less than 50 watts (10 seconds), it is determined that the battery is fully charged and charging is stopped. If the CP voltage is not detected to be 6 volts during charging, it is considered that the charging gun is disconnected from the car, and charging is stopped immediately (the relay is disconnected).

[0021] During specific use: the CP detection line enters the voltage divider circuit through the diode D6, and the MCU measures the divided voltage value through the ADC sampling pin PA0. When the value is 9 volts, it means that the charging gun is connected to the car charging port. The MCU outputs a PWM waveform with a duty cycle of 48% through the PA7 pin. The PWM signal is fed back to the CP detection line through the isolation optocoupler U9 to control the operational amplifier U5. The signal of the CP detection line becomes a PWM signal with a duty cycle of 48% and a high level of 9 volts for the car to detect. When the car detects a PWM waveform with a duty cycle of 48%, the charging power is set to 3.2KW, and the maximum voltage of the CP detection line is reduced to 6 volts. Similarly, the MCU detects that the maximum voltage is 6 volts through the ADC circuit. At this time, the MCU controls the transistors Q1 and Q12 to be turned on through the pins PA4 and PA5, and then controls the magnetic latching relays K1 and K11 to be attracted, and 220 volts of AC power is connected to supply the car charging port for charging. During the charging process, the voltage and current are fed back to the detection circuit main chip U2 through the CT1 and CT2 mutual inductance coils. The MCU reads the detection data of U2 through the serial port, and then after conversion, it controls P2 (LCD screen) through the SPI communication of the MCU to display the charging voltage, voltage, power and other information. When the power read by the MCU is less than 50W for 10 seconds, the MCU disconnects the relay through pins PA4 and PA5 to stop charging.

[0022] It should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A charging pile with automatic power on and off function, characterized in that: The system comprises a power module, an MCU, an LCD and a peripheral interface. The MCU is electrically connected to the power module, the LCD is electrically connected to the power module and the MCU, and the peripheral interface is electrically connected to the power module and the MCU.

2. The charging pile with automatic on / off function according to claim 1, characterized in that: The peripheral interface includes PWM, CP detection, voltage and current detection and relay control. The PWM is electrically connected between the power module and the MCU, the CP detection is electrically connected between the power module and the MCU, the voltage and current detection is electrically connected between the power module and the MCU, and the relay control is electrically connected between the power module and the MCU.

3. The charging pile with automatic on / off function according to claim 1, characterized in that: The MCU detects the voltage on the CP detection line through AD conversion.

4. The charging pile with automatic on / off function according to claim 2, characterized in that: The PWM output duty cycle is 48%.

5. The charging pile with automatic on / off function according to claim 1, characterized in that: The LCD is controlled via SPI communication of the MCU.

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