Light-emitting diode driver with dimmable capability

Abstract

Environmental sustainability has become a global focus, and world leaders urge scientists to find out solution to reduce energy consumption wherever possible. Lighting represents 20 % of a household's electricity consumption, and therefore energy efficient lighting systems are under progressive developments. Incandescent bulbs are phasing out in many parts of the world, and LED-based luminaries are emerging candidates to take over the market share. This work is to provide a retrofit solution to turn the existing TRIAC dimmable lighting system into LED-based system by adding only an interface device to the existing infrastructure. This line-powered TRIAC dimmable LED driver is implemented utilizing buck converter as power conditioner, valley-fill circuit as passive power factor corrector and a control IC with built-in decoder.