High-sensitivity leakage current detection circuit breaker

Abstract

The invention discloses a high-sensitivity leakage current detection circuit breaker which comprises a shielded wire, a leakage current detection unit and a disengaging mechanism, wherein the phase line core wire and the neutral line core wire of the shielded wire are respectively encircled in two conductive housing wires; the leakage current detection unit comprises a pair of rectifier diodes reversely connected between a phase line and a neutral line of a power supply in series, a voltage dropping resistor, thyristors and an RC (resistance-capacitance) voltage dropping filter circuit; and the disengaging mechanism comprises control units the on-off of which is controlled by the thyristors, wherein when any thyristor is conducted, the control unit corresponding to the thyristor is conducted, and the disengaging mechanism can generate the action of cutting off the power supply. The leakage current detection circuit breaker provided by the invention is simple in structure and higher in precision, and can respectively detect the leakage current of the phase line and the neutral line.

Description

technical field [0001] The invention relates to a leakage current detection circuit breaker (LCDI), in particular to a leakage current detection circuit breaker with simple structure and capable of separately detecting phase line or neutral line leakage. Background technique [0002] The leakage current detection circuit breaker is a safety protection device installed between the power supply and the electrical equipment. It mainly includes several parts: shielded wire, leakage current detection unit, tripping mechanism, and other circuit protection devices. Existing leakage current detection circuit breakers generally require the use of integrated circuits. For example, CN 1988099 B discloses a leakage current detection circuit breaker with a fireproof shielding wire, such as figure 1 As shown, it includes a leakage detection unit. When a leakage accident occurs, the induction coil detects the unbalanced current passing through the phase line and the neutral line, thereby ...

AI Technical Summary

Problems solved by technology

[0003] In the above technical solution, an IC integrated chip needs to be used to receive the signal of the induction coil and output it after adjustment before it can be used to control the tripping mechanism, which makes the cost of the entire leakage current detection circuit breaker relatively high

Secondly, because the induction coil is used to detect the leakage current, it may not be possible to detect the tiny leakage current in the line, thus posing a safety hazard

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