Comprehensive protection circuit of LED power supply

Abstract

The invention relates to a comprehensive protection circuit of an LED power supply, comprising an MOS tube switching power supply. The comprehensive protection circuit is characterized in that the comprehensive protection circuit is arranged in a switching power supply of an MOS tube Q1, and the comprehensive protection circuit is composed of a bias generator unit, a quick start unit, an MOS tube G-S pole protection unit, and an over-current protection unit; the output end of the bias generator unit is connected with the input end of the MOS tube G-S pole protection unit, and the quick start unit is connected across the drain of the MOS tube Q1 and the output end of the bias generator unit; a first output end of the MOS tube G-S pole protection unit is connected with the source S of the MOS tube Q1 and a second output end is connected with the gate G of the MOS tube Q1 so as to form a G-S overvoltage protection loop of the MOS tube; and the over-current protection unit is connected in parallel between the drain D and the gate G of the MOS tube Q1 to form a D-S pole overvoltage protection loop of the MOS tube Q1. The bias generator unit has a filter structure. The comprehensive protection circuit of the invention has the beneficial effects of being simple in circuit structure, low in cost, flicker-free, capable of double working protection, firm and durable, and the like.

Description

technical field [0001] The invention relates to an LED protection circuit, in particular to a comprehensive protection circuit for an LED power supply, which is suitable for circuit overcurrent and overvoltage protection of a thyristor switching power supply. The utility model belongs to the technical field of thyristor switching power supply and LED lighting. Background technique [0002] In the field of lighting equipment, traditional incandescent lamps, fluorescent lamps and other lighting equipment have been gradually replaced by LED lights due to problems such as large heat generation, high energy consumption, and inconvenient control. Because LED lighting is loved by people for its energy-saving and convenient and flexible dimming methods, LED lights are widely used. [0003] At present, the method of dimming LEDs usually uses controllable silicon to control the on-off and brightness of LED lights. In the process of transforming the old lighting circuit, the use of S...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems in the prior art that the large output ripple of the silicon controlled rectifier dimming circuit causes stroboscopic flicker, the silicon controlled silicon is easily damaged and the circuit cost is high, and provides a full protection circuit for LED power supply, which has a circuit Simple structure, low cost, no flicker and double work protection, strong and durable, etc.

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