Household electric appliance electric leakage protection socket

Abstract

The invention discloses a household electric appliance electric leakage protection socket comprising a power supply jack and an electric leakage protector which is connected with the power supply jack. The electric leakage protector comprises an electric leakage detection module, an electric outage execution module and a power supply module which supplies DC power supply VCC to the electric outage execution module. The electric leakage detection module is composed of a rectifier diode, a first current-limiting resistor and an optoelectronic coupler. The electric outage execution module comprises a trigger circuit, an execution circuit and an alarm circuit. The trigger circuit is composed of a 555 timer, a pull-up resistor, a timing resistor, a timing capacitor and an anti-interference capacitor. The execution circuit is composed of a coil of a relay, a normally-closed contact point of the relay and a freewheeling diode. The alarm circuit is composed of a second current-limiting resistor, a triode, a loudspeaker, a third current-limiting resistor and a red light-emitting diode. When electric leakage occurs in household electric appliances, the socket can generate acousto-optic alarm and cut off power so that the socket is simple in circuit structure, high in reliability of electric leakage protection, long in the service life and low in manufacturing cost.

Description

technical field [0001] The invention relates to a socket for household appliances. Background technique [0002] Generally, the casing of household appliances is grounded and insulated to ensure the safety of users. When the insulation of the casing of household appliances is damaged without effective protection measures, personal electric shock accidents will easily occur. Especially in some older residences, there are no leakage protectors or no electrical protective ground wires or poor protective grounding. Once an electric shock occurs, the consequences will be serious. In order to reduce the occurrence of this situation, various leakage protection sockets have appeared on the market. The principle of these leakage protection sockets is to detect whether there is leakage through a leakage detection module. When leakage is detected, the control is connected to the power socket. The power-off execution module disconnects the power supply. However, the structure of these...

AI Technical Summary

Problems solved by technology

However, the structure of these leakage protection sockets is relatively complicated, and most of them adopt the electromagnetic trip leakage protection method, which has more mechanical contacts, which makes the service life shorter and the leakage protection action is unreliable, and these leakage protection sockets do not have an alarm function. It is not clear whether the power outage is caused by a power outage, a blown fuse, or a leakage of household appliances. Further testing and confirmation are required, which will cause inconvenience to users.

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