Anti-interference and adjustable dual-channel leakage protector

Abstract

The invention relates to an anti-jamming trimmable two-channel leakage current protector. The circuit includes a power supply voltage regulating circuit, a first channel reference circuit, a first channel leakage signal detector, a second channel reference circuit, a second channel leakage signal detector, an anti-interference module circuit, a logic processor and a latch output circuit. The invention has three characteristics: firstly, the circuit has strong anti-interference characteristics; secondly, a trimming circuit is arranged for the leakage current detection point of the trimming circuit; thirdly, an independent two-channel leakage protection setting is adopted, and the two channels have strong consistency. This makes the leakage protection circuit in the design more in line withthe actual leakage protection requirements.

Description

technical field [0001] The invention relates to the field of leakage protection, in particular to a leakage protection circuit with anti-interference characteristics. Background technique [0002] After years of development and popularization and application, leakage protectors have formed a series of products with a considerable scale in terms of varieties and specifications. It plays an important role in the safety protection of the low-voltage power grid. The anti-interference ability of leakage protectors commonly used at present is relatively poor. The main reason is that the zero-sequence transformer used in the leakage protector is easily interfered by high-frequency electromagnetic wave signals, which generate a large interference signal at the input end of the leakage protector. Leakage protectors are prone to misoperation when receiving secondary interference signals. [0003] At the same time, the accuracy requirements for the leakage current monitoring points ...

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