An improved thyristor dimming drive circuit for LED lamps

Abstract

The invention relates to an improved silicon controlled LED dimming drive circuit, which comprises a silicon controlled dimming unit. The improved silicon controlled LED dimming drive circuit is characterized in that an output end of the silicon controlled dimming unit is provided with a single-stage PFC conversion unit, a dimming unit, an input voltage waveform detection unit, an output current sampling unit and an output control unit; the output end of the silicon controlled dimming unit is connected to an input end of the single-stage PFC conversion unit, an output end of the single-stage PFC conversion unit is connected to an input end of the output control unit, and the output control unit has a constant-current voltage output end and a power supply input end for external connection with an LED light; and an output end of the output current sampling unit and an output end of the input voltage waveform detection unit are connected with an input end of the dimming unit, and a control signal is outputted through the dimming unit to control the single-stage PFC conversion unit to have a constant output current. The invention has the characteristics of high compatibility, stability and reliability.

Description

technical field [0001] The invention relates to an improved thyristor dimming drive circuit for LED lamps. The invention belongs to the technical field of LED lamp dimming driving equipment (device). Background technique [0002] In the field of lighting equipment, because LED lighting is popular with people for its energy-saving and convenient and flexible dimming methods, LED lights are widely used. Since LED lamp beads are current-driven, when the current is not constant, the service life of LED lamp beads will be severely shortened. [0003] In the prior art, the dimming of LED lamps is usually connected to the thyristor dimmers in the live wire series, because these thyristor dimmers control the conduction of different phase angles of the input voltage sine wave, so that the output The effective value of the voltage changes, so as to achieve the purpose of adjusting the LED output current. Although this method realizes dimming of LED lights, it has the following disa...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an improved thyristor dimming drive circuit for LED lamps in order to overcome the problems of poor compatibility between the prior art thyristor dimming circuit and LED driver and the problems of easily causing LED flickering

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