Wide-pulse trigger type power supply automatic switching system with overvoltage and overcurrent protection

Abstract

The invention discloses an automatic power source turning on-off circuit with an overvoltage and overcurrent protection circuit. The automatic power source turning on-off circuit is mainly composed of a transformer T1, a button S1 arranged on a non-same-name end of an original side of the transformer T1, a rectifier filter circuit connected with an auxiliary side of the transformer T1, a time delay circuit, a voltage stabilizing circuit connected with an output end of the time delay circuit, and a load detection circuit connected with an output end of the voltage stabilizing circuit. The automatic power source turning on-off circuit is characterized in that the overvoltage and overcurrent protection circuit is arranged between the rectifier filter circuit and the time delay circuit and composed of a protecting chip U2, a triode VT1, a triode VT2, a triode VT3, a capacitor C2 and a diode D1, an anode of the capacitor C2 is connected with a CONT pin of the protecting chip U2 while a cathode of the same is connected with the rectifier filter circuit, and an N pole of the diode D1 is connected with a VCC pin of the protecting chip U2 while a P pole of the same is connected with a TR1 pin of the protecting chip U2. The overvoltage and overcurrent circuit can automatically execute protection action when current or voltage on an electricity load is overloaded, so that the load and the power source turning on-off circuit are avoided being damaged.

Description

technical field [0001] The invention relates to an automatic power switch system, in particular to a wide pulse trigger type power automatic switch system with overvoltage and overcurrent protection. Background technique [0002] Electric energy is a convenient energy source, and its wide application has formed the second technological revolution in the modern history of mankind. It has effectively promoted the development of human society, created huge wealth for human beings, and improved human life. At present, people cannot do without electricity in production and life. [0003] With the continuous progress of society and the continuous development of science and technology, people are more and more concerned about the earth on which we live, so low-carbon environmental protection has long become a social development trend. At the same time, with the improvement of people's living standards and the continuous increase of household appliances, personal electric shock an...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the sensitivity of the automatic protection function of the power switching circuit currently used is not high, and to provide a wide pulse trigger type power automatic switching system with overvoltage and overcurrent protection

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