Safety protection system for electric vehicle charging circuit

Abstract

The invention provides a safety protection system for an electric vehicle charging circuit. The safety protection system for the electric vehicle charging circuit comprises a current monitoring unit,a comparator unit, a state memory unit, a feedback level generating unit and a relay switching control unit, wherein the current monitoring unit comprises a leakage current monitoring unit used for monitoring a leakage current signal in real time and converting the leakage current signal into a first reference voltage signal; the comparator unit comprises a first comparator module used for comparing the first reference voltage signal with a first comparison voltage and outputting a corresponding first output level according to a comparison result; the state memory unit comprises a silicon controlled device and controls the silicon controlled device to be switched on or off according to the first output level; the feedback level generating unit is used for generating a feedback level according to the switch-on or switch-off of the silicon controlled device; and the relay switching control unit is used for controlling a charging circuit to be switched on or switched off by using the feedback level. According to the safety protection system for the electric vehicle charging circuit provided by each embodiment of the invention, effective safety protection of the electric vehicle charging circuit can be realized.

Description

technical field [0001] The present application relates to the technical field of circuit safety protection, in particular to a safety protection system for electric vehicle charging circuits. Background technique [0002] The application of electric vehicles can effectively reduce environmental pollution caused by exhaust emissions. The electric energy supply of electric vehicles is crucial to the widespread application of electric vehicles. At present, electric vehicle charging stations can be seen everywhere, and car owners can charge at the charging station through the car's charging equipment, which is convenient and fast. [0003] However, in the existing electric vehicle charging equipment, the safety protection of the electric vehicle charging circuit is often ignored. The electric vehicle charging circuit is likely to cause common circuit faults such as overcurrent and leakage current in the charging circuit due to aging and damage of the circuit, which has cause...

AI Technical Summary

Problems solved by technology

[0003] However, in the existing electric vehicle charging equipment, the safety protection of the electric vehicle charging circuit is often ignored.

The electric vehicle charging circuit is likely to cause common circuit faults such as overcurrent and leakage current in the charging circuit due to aging and damage of the circuit, which has caused a large safety hazard.

[0004] There are at least the following problems in the prior art: In the existing car charging circuit, there is no effective safety protection for the charging circuit, and there is a large potential safety hazard

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