Switch power driving chip and silicon controlled rectifier dimmer LED drive circuit

Abstract

The invention belongs to the technical field of constant current driving, and provides a switch power driving circuit and a silicon controlled rectifier dimmer LED drive circuit. A switch power driving chip is connected with an input-level rectification filter circuit and an output-level circuit, The input-level rectification filter circuit is connected with a silicon controlled rectifier dimmer. The switch power driving chip comprises a dimmer control module, a voltage sampling module, a constant current control module, an error amplifier, conduction time control module, a demagnetization control module, a trigger and a switch member. The silicon controlled rectifier dimmer conducts tangential processing on a wire mesh, and the brightness of a lighting lamp is changed accordingly according to the tangential angle. The input referential voltage of an in-phase input end of the error amplifier is changed to change the current passing through the LED lamp and to further change the brightness of the LED lamp and achieving silicon controlled rectifier dimming purpose. The maximal output current does not fluctuate with the wire mesh and output voltage. The dimming scope is wide, and the cost performance is high.

Description

technical field [0001] The invention belongs to the technical field of constant current driving, and in particular relates to a switching power supply driving chip and a thyristor dimming LED driving circuit. Background technique [0002] Since human beings realize that we must do everything possible to save energy and reduce emissions in order to solve the urgent problem of atmospheric warming, how to reduce lighting power consumption has become an important issue on the agenda, because lighting power consumption accounts for 20% of total energy consumption. As a new generation of green lighting source, high-brightness light-emitting diode (Light Emitting Diode) has the advantages of saving energy by more than 5 times than incandescent lamps, and about twice as energy-saving as fluorescent lamps and energy-saving lamps, and does not contain mercury like fluorescent lamps and energy-saving lamps. . If you can also use dimming to save energy, it is also a very important mean...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a switching power supply drive chip and a thyristor dimming LED drive circuit, aiming to solve the problem that the maximum output current in the thyristor dimming technology in the prior art is caused by the fluctuation of the input line network and the output voltage. risky issues

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