Leakage protection circuit

Abstract

The invention provides a leakage protection circuit, which includes a leakage detection unit, which is used to detect whether a leakage occurs in the circuit, and outputs a leakage signal when a leakage occurs. The first loop includes a control switch, a voltage divider and a protector, and the control switch After being connected in parallel with the voltage divider, it is connected in series with the protector. When the first circuit receives the leakage signal, the power supply line is cut off by the protector. The switch control circuit disconnects the control switch when the current in the first circuit is greater than or equal to the preset value, so that The current flows through the voltage divider for voltage division, and the control switch is turned on when the current is less than a preset value. When the current of the first circuit is too large, connect the voltage divider in series to the first circuit to divide the voltage, reduce the current flowing through the protector, and avoid the large impact on the matching actuator caused by the excessive current of the protector. The electrical life of the leakage protection circuit breaker is enhanced; when the current of the first loop is small, the voltage divider will be short-circuited to ensure that the protector has enough current to flow through to disconnect the power supply at the fault.

Description

technical field [0001] The invention relates to the technical field of leakage protection. Specifically, it relates to a leakage protection circuit. Background technique [0002] The leakage protection device in the low-voltage power distribution system is one of the effective measures to prevent personal electric shock accidents, and it is also one of the technical measures to prevent electrical fires and electrical equipment damage accidents caused by leakage. [0003] Common leakage protection devices include leakage protectors, circuit breakers, etc. In the prior art, when the load is running online, it will detect whether there is a leakage fault in the circuit through the detection element, such as a transformer. In a specific application, the live wire and neutral wire of a certain phase line pass through the magnetic ring of the transformer to form a The primary coil of the transformer is formed, and the winding wound on the magnetic ring constitutes the secondary ...

AI Technical Summary

Problems solved by technology

[0006] For this reason, the technical problem to be solved by the present invention is that the leakage protection circuit in the prior art generally adopts the mode of working with a single tripping coil, and the tripper works under the condition of exceeding the normal working voltage for a long time, so that the current flowing through the tripping coil The current of the circuit breaker is large, resulting in excessive tripping force of the tripping coil, causing a large impact on the matching actuator, resulting in unnecessary damage, reducing the electrical life of the leakage protection circuit breaker, thereby providing a A leakage protection circuit capable of enhancing the electrical life of a leakage protection circuit breaker

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