A short circuit protection circuit

Abstract

The invention provides a short-circuit protection circuit, relates to the technical field of electric power, and mainly solves the technical problem of short-circuiting of electric circuit in normal operation. The invention includes: sequentially connected circuit voltage, starting circuit, state holding circuit, buffer drive circuit, dual-tube output switch circuit, overcurrent detection circuit and state indicating circuit; the starting circuit is used to start the short circuit protection circuit; the state holding circuit Used to maintain the normal access state or short-circuit state; the buffer drive circuit is used to enable the state maintenance circuit to output a large enough current to drive the dual-tube output switch circuit; the dual-tube output switch circuit is used to release the short-circuit voltage of the load; over-current detection The circuit is used to detect whether there is a short circuit state; the state indication circuit is used to display whether there is a short circuit state by turning on and off the indicator light. Therefore, the present invention has the characteristics of high safety and strong practicability, plays the role of protecting the circuit, and avoids the burning of the circuit and the occurrence of fire.

Description

technical field [0001] The invention relates to the technical field of electric power, in particular to a short circuit protection circuit. Background technique [0002] In the short circuit of the line, the so-called short circuit means that the two wires of the AC circuit touch each other, and the current does not pass through the electrical equipment in the line, but directly forms a loop. Since the resistance of the wire itself is relatively small, if it only passes through the loop of the wire, the current will increase sharply, hundreds or even tens of thousands of times larger than normal. If such a large current passes through such a thin wire, the greater the resistance of the wire, the more heat will be generated, which will cause the wire to generate a temperature as high as thousands of degrees Celsius in a very short time, which is enough to ignite nearby combustibles. cause a fire. The reason for the short circuit of the line is that due to the long-term use ...

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to propose a short circuit protection circuit, which solves the technical problem of short circuit of electrical circuits in normal operation in the prior art

Images