A leakage current protection device

Abstract

The invention provides a leakage current protecting device. The leakage current protecting device comprises a leakage current isolation sampling unit, a protected area connectivity detecting unit, a full-wave rectification and amplification unit, a signal output unit and a relay control unit, wherein the leakage current isolation sampling unit acquires leakage current signals generated by an external load, and transmits the leakage current signals to the full-wave rectification and amplification unit to be rectified and amplified; the full-wave rectification and amplification unit transmits the leakage current signals which are rectified and amplified to the signal output unit and the relay control unit; the protected area connectivity detecting unit is connected with the relay control unit; a processor in the relay control unit transmits an active leakage current starting signal; the active leakage current starting signal controls conduction of an optocoupler; active leakage current is generated; the active leakage current is transmitted to the processor in the relay control unit via the leakage current isolation sampling unit, the full-wave rectification and amplification unit and the signal output unit; and the processor detects whether protected areas are connected with each other or not and whether alternating-current inputs are mistakenly connected to one another sequentially or not according to the active leakage current.

Description

Technical field [0001] The invention belongs to the field of power electronics, and relates to a leakage current protection device, in particular to a protective ground connectivity detection and leakage current detection device. Background technique [0002] Various electrical products have been widely used in users' homes, and household electric water heaters have been familiar and accepted by users for a long time, and are being widely used. As an essential function of electric water heaters, refrigerators, etc., leakage protection provides users with a certain degree of security. However, some users are still injured by leakage every year. The reason is not that the leakage protection function does not work, but Because the electrical environment is unreliable, that is, the protective ground is not connected or the grounding is unreliable. If electrical equipment leaks, if there is no reliable grounding, electric shock accidents may occur. [0003] Leakage current detection u...

AI Technical Summary

Problems solved by technology

Leakage protection, as an essential function of electric water heaters and refrigerators, has brought certain safety guarantees to users. However, some users are still injured by leakage every year. The reason is not because the leakage protection function does not work, but because Because the power environment is unreliable, that is, the protective ground is not connected or the grounding is unreliable

If electrical equipment leaks electricity, there will be electric shock accidents if there is no reliable grounding

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