Grounding signal detection circuit of charging pile

Abstract

The invention relates to the field of grounding signal detection of charging piles, and discloses a grounding signal detection circuit of a charging pile. The circuit comprises a zero line interface,a ground wire interface, a rectification circuit, a voltage division circuit and a signal generation circuit. The zero line interface is electrically connected with the zero line; the voltage divisioncircuit divides the live wire voltage; the intermediate voltage connection point of the voltage division circuit is electrically connected with a ground wire and the ground wire interface. The rectification circuit rectifies the voltage between the zero line interface and the ground wire interface. The rectification circuit is electrically connected with the signal generating circuit; the detection signal outputted by the signal generation circuit is inversely proportional to the voltage outputted by the rectification circuit. When the voltage between the zero line interface and the ground line interface rises, the voltage value of the detection signal outputted by the signal generation circuit decreases, and when the voltage is less than 0.8 V, the MCU receiving the detection signal inputs a low level signal, and the charging pile reports ground fault information to realize ground abnormality detection.

Description

technical field [0001] The invention relates to the field of ground signal detection of charging piles, in particular to a ground signal detection circuit of charging piles. Background technique [0002] With the popularity of new energy vehicles, charging piles have also been installed in public places such as communities, high-speed service areas and industrial parks. The grounding detection of the charging pile is very important in use. The electric vehicle charging pile industry standard GB / T18487.1 in 5.2.1.2 clearly requires that the charging pile must realize the continuous monitoring function of the continuity of the protective grounding conductor and meet the insulation withstand voltage conditions. If the abnormality of the grounding circuit is not detected, if the charging pile leaks electricity, it will cause personal injury to the charging pile user. However, the existing charging pile grounding signal detection circuit has problems such as low reliability, com...

AI Technical Summary

Problems solved by technology

[0003] In view of the lack of background technology, the present invention provides a grounding signal detection circuit for charging piles. The technical problem to be solved is that the existing charging pile signal detection circuit has low reliability and complex implementation, which is not conducive to popularization

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