a protection circuit

Abstract

The embodiment of the invention discloses a protective circuit. The protective circuit comprises a first switch module, a second switch module and a third switch module, wherein the first switch module is used for receiving switch signals output by the second switch module or the third switch module and controlling the communication state between the voltage input end and the first voltage output end; the second switch module is used for outputting a first switch signal when an output current is overlarge and controlling a first switch pipe to be turned off to prevent voltage output at the first voltage output end, so that loads are protected; the third switch module is connected with the voltage input end, the ground and the first switch module and is used for outputting a second switch signal when short circuits occur at the first voltage output end and a second voltage output end and controlling the first switch pipe to be turned off to prevent voltage output at the first voltage output end, so that the loads are protected. By means of the protective circuit, a power source can be automatically stopped when the temperature of the loads is over high, the using stability of the circuit is improved, and the service life of circuit elements and the service life of the loads are prolonged.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a protection circuit. Background technique [0002] With the continuous development of electronic technology, there are more and more electrical appliances. Some household electrical appliances such as electric lights, refrigerators, washing machines, microwave ovens, etc. have brought great convenience to people's lives. In addition to bringing convenience to people's life and entertainment, it can also help people greatly improve work efficiency. People's life is basically inseparable from electricity and various electrical appliances. But, along with the continuous improvement of people's living standards, the universal application of various electrical appliances makes the quantity of electrical appliances constantly increase. In the process of using electricity, due to the defects of the electrical equipment itself or improper use may cause short circuit or overcurrent, a large ...

AI Technical Summary

Problems solved by technology

In the process of using electricity, due to the defects of the electrical equipment itself or improper use may cause short circuit or overcurrent, a large current will be generated in the circuit at this time, and a large amount of heat will be generated, which will burn out the electrical equipment and even cause Personal electric shock or fire accidents will cause huge losses to people's lives and property safety

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