Silicon controlled rectifier dimming control system for LED brightness adjustment

Abstract

A silicon controlled rectifier dimming control system for LED brightness adjustment is disclosed. A dimming control circuit is improved and optimized. Through introducing a conduction angle compensation technology, when a silicon controlled rectifier dimmer is adjusted to a largest conduction angle, an output current reaches a rated output current value. Through optimizing a dimming drop-down circuit parameter, when the silicon controlled rectifier dimmer is adjusted to a minimum conduction angle, an output current reaches a minimum value which is zero. Human eyes are not sensitive to heavy current LED illumination brightness changes and are sensitive to low current LED illumination brightness changes, based on that, a dimming curve is optimized, a two-segments dimming curve of rapid dimming and slow dimming is designed and two-segment dimming is realized. Through combining a corresponding PFC control circuit, basic requirements of a high power factor required by a basic LED driving circuit, low harmonic wave pollution, stable constant current output and the like are satisfied and simultaneously wide range adjusting can be performed on the LED illumination brightness according to the silicon controlled rectifier dimmer.

Description

technical field [0001] The invention relates to LED brightness adjustment technology, in particular to a thyristor dimming control system for LED brightness adjustment. Background technique [0002] LED (Light Emitting Diode) has many advantages such as long life, low power consumption, high brightness, and small size. Compared with traditional incandescent lamps, LED lamps only need 1 / 10 of the energy consumption to achieve the same luminous brightness, and the service life can be extended hundreds of times. With the increasing maturity of LED technology research, it is an inevitable trend for LED lighting to replace traditional lighting methods such as incandescent lamps and halogen lamps. [0003] With the continuous deepening of the concept of energy saving and environmental protection and the urgent needs of users for different lights in different environments, the dimmable lighting solution is widely used in home, office, street lights because of its energy saving, ad...

AI Technical Summary

Problems solved by technology

In addition, due to the limited conduction angle of the thyristor dimmer, the theoretical adjustment range of 0° to 180° cannot be achieved, thus limiting its dimming range

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