Ground fault protecting circuit and ground fault breaker

Abstract

The invention elates to a ground fault protecting circuit and a ground fault breaker. The circuit comprises a power circuit, a leakage ground detecting circuit, a signal amplifying shaping circuit, a single-chip control circuit, a power detecting and working indicating circuit, a releasing mechanism control circuit and a reversed wiring detecting and performing circuit; a first filter voltage stabilizing circuit of the power circuit is connected with the leakage ground detecting circuit; a second filter voltage stabilizing circuit is connected with the signal amplifying and shaping circuit and the single-chip control circuit; the leakage ground detecting circuit, the signal amplifying and shaping circuit and the single-chip control circuit are connected in sequence; the single-chip control circuit is respectively connected with the power detecting and working indicating circuit and the releasing mechanism control circuit; the breaker comprises a breaker body and a ground fault protecting circuit which is arranged in the breaker body. According to the ground fault protecting circuit and the ground fault breaker, the reversed wiring detecting and performing circuit and a simulating leakage circuit are added to avoid the potential risk caused by inaccurate wiring and leakage fault, and therefore, the protection safety of the circuit can be improved.

Description

technical field [0001] The present invention relates to a ground fault protection circuit and also to a ground fault circuit breaker using the circuit. Background technique [0002] Ground Fault Circuit Interrupter GFCI (Ground Fault Circuit Interrupter) is a leakage protection product widely used in the United States, Canada and other North American and South American countries and regions. The existing GFCI usually includes a base, an upper cover with jacks, an electromagnetic tripping mechanism, a contact assembly, a grounding assembly, a power input connection assembly, an output connection assembly, etc., and its circuit includes a power supply circuit, an electric leakage ground detection circuit, a signal Amplifying circuit, power indicating circuit and tripping mechanism control circuit, the electromagnetic tripping mechanism is controlled by the earth leakage detection circuit to operate. The GFCI can provide power to the load through the socket on the upper cover,...

AI Technical Summary

Problems solved by technology

[0003] However, the existing GFCI has the following potential safety hazards due to circuit design limitations:

[0004] First of all, the existing GFCI circuit lacks a perfect reverse wiring detection function. When the installer reverses the power line due to misuse, the GFCI may not be able to perform the leakage protection function and lose its role in ground fault protection.

Therefore, the existing GFCI has installation risks, and it is usually difficult for users to find out when the power line is reversed.

[0005] Secondly, the working status of the existing GFCI products is detected through manual detection circuits. During the use of GFCI products after installation, users need to press the button of the manual detection circuit to know whether the GFCI products are in normal working sta

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