Leakage protection device against accidental power failure

Abstract

The invention discloses an electric leakage protection device for preventing mistaken power outrage. The electric leakage protection device comprises a detection circuit, a control circuit, a switching power supply and a control switch. The detection circuit is used for detecting current difference of three wires, comparing the detected current difference with the maximum safe current which can be borne by a human body and outputting a comparison result to the control circuit; the control unit is arranged between a power input end and a power output end of a system circuit and is used for controlling on / off of the three wires according to the comparison result of circuit detection; the switching power supply is connected between a live wire and a neutral wire of the circuit and is used for providing power for the control circuit; and one end of the control switch is connected, between the power input end and the control circuit, to the neutral wire, and the other end of the control switch is connected, between the power output end and the control circuit, to the neutral wire, wherein a portion, connected with the live wire, of the switching power supply is located between the control circuit and the power input end, and a portion, connected with the neutral wire, of the switching power supply is located between the control circuit and the power output end. With the electric leakage protection device, the probability that electrical equipment is powered off by mistake is reduced on the premise of comprehensive protection.

Description

technical field [0001] The invention relates to the technical field of electrical appliances, in particular to a leakage protection device for preventing accidental power failure. Background technique [0002] Existing leakage switches, circuit breakers, leakage appliances and other products have a single function, only the L-N leakage protection function, that is, when the current difference between the live wire and the neutral wire reaches a certain threshold, the power is cut off by disconnecting the live wire or the neutral wire, even when When the electrical equipment is well grounded, as long as the leakage current between the L-N line of the equipment and the ground wire reaches a certain value, the power-off protection will also be performed. [0003] Generally speaking, the equipment casing is connected to the ground wire in the power cord of the electrical equipment. The leakage of the equipment is caused by the leakage of the live wire of the power line to the eq...

AI Technical Summary

Problems solved by technology

In the prior art, many home appliances with motors have a certain amount of leakage current to the ground wire, but because the existing leakage protection device only detects the current difference between the L-N wires, the probability of accidental power failure of the electrical equipment is increased, resulting in Electrical equipment cannot be used normally, which brings a lot of trouble to users, and also makes it impossible for many electrical equipment to use leakage protection devices.

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