Charging gun system control circuit

Abstract

The invention discloses a charging gun system control circuit, which comprises an AC-DC power supply module, a single chip microcomputer, a controller and a relay control circuit, wherein the AC-DC power supply module is connected with commercial power to supply power to the single chip microcomputer, the controller and the relay control circuit; a relay control pin is arranged on the single chipmicrocomputer, and the input end of the controller is connected with the relay control pin. The relay control circuit comprises a relay K1, a relay K2, a diode D1 and a diode D2, positive electrodes of primary coils of the relay K1 and the relay K2 are connected with the AC-DC power supply module, and negative electrodes of the primary coils are connected with an output pin of the controller; oneend of a secondary coil of the relay K1 is connected with a power live wire L, and the other end is connected with a charging gun L-pole output end; one end of a secondary coil of the relay K2 is connected with the power zero line N, and the other end is connected with the N-pole output end of the charging gun. The switch relay can still be driven at an extremely low temperature, the adaptabilityis good, and control is more convenient and accurate.

Description

technical field [0001] The invention relates to the technical field of charging, in particular to a charging gun system control circuit. Background technique [0002] As the energy supply station for the operation of electric vehicles, the electric vehicle charging pile is an important supporting infrastructure necessary for the commercialization of electric vehicles. The charging gun is a device on the electric vehicle charging pile that is connected to the mains and supplies power to the electric vehicle. [0003] When charging an existing electric vehicle, insert the charging gun into the on-board charging port to connect with the on-board charger. CP is the control connection line between the charging gun and the on-board charger. After the internal charging control circuit confirms that the signal is normal, the positive voltage of the PWM rectangular wave voltage generated by the CP drops from 12V to 6V, and the negative voltage is -12V. After the charging gun receive...

AI Technical Summary

Problems solved by technology

[0004]The existing charging gun control circuit pulls the triode through the I / O port of the microcontroller to drive the MOS tube, and then turns on the relay to control the charging, but in a special geographical environment For example, the outdoor temperature in winter in the north can reach -40°C. In such a low temperature environment, the driving current needs to reach 400mA~500mA. The existing control circuit structure cannot reach this driving current, resulting in the failure of the relay to pull in, resulting in charging. Fault

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