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 circuit of an electric appliance circuit in normal operation work. The circuit comprises a circuit voltage, a starting circuit, a state holding circuit, a buffer drive circuit, a double-tube output switch circuit, an overcurrent detection circuit and a state indication circuit which are connected in sequence, wherein the starting circuit is used for starting the short-circuit protection circuit, the state maintaining circuit is used for maintaining a normal on-state or a short-circuit state, and the buffer driving circuit is used for enabling the state maintaining circuit to output a current which is large enough to drive the double-tube output switching circuit; the double-tube output switch circuit is used for releasing the short-circuit voltage of a load, the overcurrent detection circuit is used for detecting whether a short-circuit state exists or not, and the state indication circuit is used for displaying whether a short-circuit state exists or not through on-off of an indication lamp. Therefore, the short-circuit protection circuit has the characteristics of high safety and strong practicability, plays a role in protecting the circuits, and avoids the circuit burnout and fire disasters.

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

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