Overcurrent protection circuit with feedback

Abstract

The invention discloses an overcurrent protection circuit with a feedback, and belongs to the field of automatic control. The protection circuit comprises a sampling circuit, a feedback circuit, a switching circuit, and an adjustment circuit. On end of a protection point is connected to the sampling circuit, the other end of the protection point is connected to the feedback circuit and the adjustment circuit, the sampling circuit is connected to the switching circuit, the switching circuit is connected to the adjustment circuit, and the adjustment circuit is connected to the feedback circuit. The sampling circuit conducts voltage sampling when the protection point is triggered by overcurrent. When a sampled voltage reaches a preset value, the switching circuit is conducted, the adjustment circuit is cut off, and the protection point is protected. The overcurrent protection circuit of the invention can form overcurrent protection and quick-breaking protection conveniently. A circuit is automatically cut off when the current exceeds a limit value of the protection circuit to achieve the technical effect of protecting electrical components from being burned out by high current.

Description

technical field [0001] The invention relates to the field of automation control, in particular to an overcurrent protection circuit with feedback. Background technique [0002] When electrical components such as transmission lines, generators, and transformers in the power system fail, short-circuit current will pass through the system, and the closer the fault point is to the power supply, the greater the short-circuit current will be, which will cause electrical components to be burned out by excessive current. Contents of the invention [0003] The purpose of the present invention is to provide a simple, reasonable, and practical overcurrent protection circuit with feedback, which can prevent electrical components from being burned out by large currents. The specific technical scheme is as follows: [0004] An overcurrent protection circuit with feedback, comprising: a sampling circuit, a feedback circuit, a switch circuit and an adjustment circuit; wherein, one end of ...

AI Technical Summary

Problems solved by technology

[0002] When the transmission lines, generators, transformers and other electrical components of the power system fail, a short-circuit current will pass through the system, and the closer the fault point is to the power supply, the greater the short-circuit current will be, which will cause the electrical components to be burned out by excessive current

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