Title :
An Efficient Driver for Dimmable LED Lighting
Author :
Moo, Chin-Sien ; Chen, Yu-Jen ; Yang, Wen-Ching
Author_Institution :
Dept. of Electr. Eng., Nat. Sun Yat-Sen Univ., Kaohsiung, Taiwan
Abstract :
An efficient driver circuit is proposed for light-emitting-diode (LED) lamps with a dimming feature. The driver consists of a flyback converter in series with the dc-link. By processing partial power of the driver circuit for current regulation, the loss produced by power conversion can be diminished. The dimming feature is accomplished by means of current amplitude modulation (AM) or double pulse-width modulation (DPWM). The detailed circuit operation stages and analysis are provided. A laboratory circuit is designed for a 45 W LED lamp. Experimental results demonstrate that a high efficiency can be achieved, even at dimmed lamp power.
Keywords :
LED lamps; PWM power convertors; amplitude modulation; electric current control; lighting; AM; LED lamp; circuit operation analysis; circuit operation stages; current amplitude modulation; current regulation; dc-link; dimmable LED lighting; dimming feature; double pulse-width modulation; efficient driver circuit; flyback converter; light-emitting-diode lamps; power 45 W; power conversion; Capacitors; Driver circuits; Inductors; LED lamps; Switches; Voltage control; Amplitude modulation (AM); double pulse-width modulation (DPWM); flyback converter; light-emitting-diode (LED);
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2012.2183892
