CP detection circuit of electric vehicle charging pile

Abstract

The utility model relates to the technical field of charging equipment, in particular to an electric vehicle charging pile CP detection circuit, which comprises a signal detection circuit and a PWM signal generation circuit which are electrically connected, the signal detection circuit comprises an operational amplifier U10A, a pin 1 of the operational amplifier U10A is electrically connected with an optocoupler OP6, and a pin 2 of the operational amplifier U10A is electrically connected with a pin 2 of the optocoupler OP6. A CP signal acquisition interface is electrically connected to a pin 3 of an operational amplifier U10A through a resistor R37, and the output end of an optical coupler OP6 is electrically connected with a state feedback circuit. After the charging gun is inserted into the electric automobile, the charging gun is connected in series with the resistor R37 in the electric automobile, the output voltage of the signal detection circuit is reduced, and the luminous quantity of the optocoupler OP6 is changed, so that the connection is successful, the charging state of the charging pile is controlled according to the feedback of the electric automobile, and a handshake signal between the automobile and the charging pile is realized; the method is good in verification effect, low in cost and relatively high in practicability when the charging piles are used massively.

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