Control circuit and control method for internet intelligent AC charging pile

Abstract

The invention discloses a control circuit and a control method for an internet intelligent AC charging pile, and belongs to the field of electric car charging piles. The control circuit comprises a lightning protection circuit, a power supply circuit, an electric energy metering circuit, a relay, a charging gun, a CPU circuit, an on-off input, an on-off output, a connection detection circuit, an RS485 interface, an Ethernet interface and a GPRS module, wherein a monitoring pin of the lightning protection circuit is connected with a resistor and a diode in series and is isolated with an optocoupler; a signal enters a CPU; one path of output of the electric energy metering circuit is connected with the CPU through a serial port; the on-off input is connected with the CPU; the CPU is connected with the RS485 interface, the Ethernet interface, the GPRS module, the relay and the on-off output respectively; and one path of output of the CPU is connected with the charging gun through the connection detection circuit. A modular design of the original charging pile is changed into an integrated design, so that the material cost and the production cost are reduced; and the reliability is improved. A leakage current is measured in real time; a background management system can know cable insulation in advance; and an electric shock hazard is avoided.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle charging piles, and specifically designs a control circuit and a control method of an Internet intelligent AC charging pile Background technique [0002] At present, the electric vehicle AC charging piles on the market are basically composed of charging interface circuit, electric energy meter, leakage protector, lightning protection device, card reader, GPRS module and main control part. The main control part is realized by controlling the AC contactor. Electric energy output; Among them, the electric energy meter, leakage protector, lightning protection device, GPRS module and AC contactor are all products purchased from a third party, and then installed in the pile body, so as to realize electric energy measurement, leakage protection, remote communication, anti-corrosion The function of lightning and AC output control, this implementation method is costly due to the large number of pu...

AI Technical Summary

Problems solved by technology

[0002] At present, the electric vehicle AC charging piles on the market are basically composed of charging interface circuit, electric energy meter, leakage protector, lightning protection device, card reader, GPRS module and main control part. The main control part is realized by controlling the AC contactor. Electric energy output; Among them, the electric energy meter, leakage protector, lightning protection device, GPRS module and AC contactor are all products purchased from a third party, and then installed in the pile body, so as to realize electric energy measurement, leakage protection, remote communication, anti-corrosion The function of lightning and AC output control, this implementation method is costly due to the large number of purchased components; at the same time, due to the large volume of purchased components such as electric energy meters, leakage protectors, GPRS modules, lightning protection devices and AC contactors , resulting in a large volume of the charging pile; and the leakage current status cannot be monitored in real time

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