Short circuit protection system

Abstract

The invention belongs to the electronic communication technical field and relates to a short circuit protection system used for an electricity utilization system, wherein the electricity utilization system includes a direct-current power source and electricity utilization equipment, wherein the electricity utilization equipment includes a power source input end and a grounding end. The short circuit protection system comprises the following components of: a first switch branch circuit which is controllably connected in series between the direct-current power source and the power source input end, and is switched on under first control signals so as to realize normal power supply, and is switched off under second control signals so as to protect electricity utilization equipment; a second switch branch circuit which is controllably connected between the grounding end and the control end of the first switch branch circuit, and generates the first controls signals when being switched on, and is switched off when the electricity utilization equipment is short circuited; a current limiting branch circuit which generates third control signals and decreases the current of the electricity utilization system when the first switch branch circuit is switched off so as to protect the electricity utilization equipment. The short circuit protection system of the invention has the advantages of easiness in implementation, safety and reliability. With the short circuit protection system adopted, when short-circuit faults are eliminated, power supply can be recovered automatically without manual intervention required; and self protection of the electricity utilization system in short-circuit faults can be realized.

Description

technical field [0001] The invention relates to the technical field of electronic communication, in particular to a short circuit protection system. Background technique [0002] Today's consumer electronic products, such as mobile phones, MP3 players, cameras, etc., are often powered by batteries or DC power supplies. However, the quality of batteries on the market is uneven, and there are often reports of battery explosions and injuries. Most of these incidents are due to short circuits in electrical equipment, and the batteries or charging power sources used do not provide qualified short circuit protection. , resulting in battery failure. More seriously, it may even cause a major fire. Existing short-circuit protection systems are either too complex, have low reliability, or high cost, or cannot automatically restore power supply when the short-circuit fault is removed, and all have certain limitations. Contents of the invention [0003] The purpose of the present i...

AI Technical Summary

Problems solved by technology

Existing short-circuit protection systems are either too complicated, have low reliability, or high cost, or cannot automatically restore power supply when the short-circuit fault is removed, all of which have certain limitations

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