Cascade protection circuit for extension socket

Abstract

The invention discloses a cascade protection circuit for an extension socket. The cascade protection circuit comprises an induction circuit, an anti-interference shaping filtering circuit, a control circuit and an executing circuit, and the induction circuit induces overcurrent signals of a live wire of an output terminal and generates overcurrent signal voltage; the anti-interference shaping filtering circuit is connected with the induction circuit and performs anti-interference shaping and filtering processing to the overcurrent signal voltage; the control circuit is provided with an input end, an output end and a control end, and the control end is connected with an output end of the anti-interference shaping filtering circuit; the execution circuit is provided with a power switch and a tripping coil which is connected with the output end of the control circuit, the power switch is arranged on the live wire or a zero line in the output terminal, the tripping coil controls switching off of the power switch, and the control circuit is in a disconnecting state to drive the tripping coil to act to switch off the power switch when the induction circuit generates the overcurrent signal voltage and voltage output by the anti-interference shaping filtering circuit is equal to or exceeds a threshold value of the control circuit. By means of the cascade protection circuit, automatic protection of the extension socket and loaded electrical appliances can be achieved.

Description

technical field [0001] The present invention relates to the field of protection circuits, and more specifically relates to a hierarchical protection circuit for socket outlets, which can perform lightning protection, surge protection, overheat protection, overcurrent protection, and short-circuit protection for socket outlets, thereby preventing the socket itself from burning out. At the same time, it can protect the loaded electrical appliances to avoid burning out electrical appliances and fires. Background technique [0002] With the progress of society and the continuous improvement of people's living standards, various electrical equipment is gradually increasing. In order to facilitate the placement of electrical equipment and allow electrical equipment to be connected to the mains, the power strip has become an indispensable part of people's daily life. missing auxiliary connection device. [0003] At present, the common sockets in the market generally include one se...

AI Technical Summary

Problems solved by technology

The above-mentioned sockets can only realize simple additions on the line. Once the sockets encounter lightning and surges, or overheat, overcurrent, overvoltage or short circuit, etc., the above-mentioned sockets will burn themselves out, burn all load electrical appliances, and even cause fire and other hidden dangers

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