Electric leakage protection switch with automatic detection and self-resetting functions and protection method

Abstract

The invention relates to an electric leakage protection switch with automatic detection and self-resetting functions. The electric leakage protection switch comprises a control chip, a relay, a voltage reduction circuit, a power source circuit, an electric leakage detection circuit, a mains supply detection synchronous circuit and a driving circuit; the electric leakage detection circuit comprisesa mutual inductor coil HGQ1; two input lines of a mains supply penetrate through the mutual inductor coil HGQ1; one end of the mutual inductor coil HGQ1 is grounded, and the other end of the mutual inductor coil HGQ1 is connected with the pin of the control chip; the voltage reduction circuit comprises a first resistor module, a second resistor module and an electronic switch module; and the first resistor module and the second resistor module are connected in series. The protection switch has electric leakage protection and automatic resetting functions. In addition, the invention further discloses a corresponding electric leakage protection method.

Description

technical field [0001] The invention relates to the technical field of protection switches, in particular to a leakage protection switch with automatic detection and self-resetting and a protection method. Background technique [0002] Current leakage protection switches on the market have the following defects: [0003] First, when the mains voltage is too low, there is not enough energy to drive the relay to turn on and off the mains, and the protection switch cannot work normally. [0004] Second, after the power is cut off, the protection switch cannot be automatically reset when the leakage is removed, and it needs to be manually reset, which is often not reset in time, which will cause great troubles to production and life, such as refrigerators that need to be started 24 hours, industrial equipment The impact of downtime on production schedule, etc. [0005] Third, there is no automatic detection module for the leakage detection transformer itself. If the leakage de...

AI Technical Summary

Problems solved by technology

[0003] First, when the mains voltage is too low, there is not enough energy to drive the relay to turn on and off the mains, and the protection switch cannot work normally

[0004] Second, after the power is cut off, the protection switch cannot be automatically reset when the leakage is removed, and it needs to be manually reset, which is often not reset in time, which will cause great troubles to production and life, such as refrigerators that need to be started 24 hours, industrial equipment The impact of downtime on production progress, etc.

[0005] Third, there is no automatic detection module for the leakage detection transformer itself. If the leakage detection transformer itself is damaged and cannot work, the protection switch cannot identify the leakage and cut off the power, causing a great safety hazard;

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