An Efficient Driver for Dimmable LED Lighting

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 diminishe...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2012-11, Vol.27 (11), p.4613-4618
Main Authors: Moo, Chin-Sien, Chen, Yu-Jen, Yang, Wen-Ching
Format: Article
Language:English
Subjects:
Amplitude modulation (AM)
Capacitors
Circuits
Control
Conversion
Dimming
double pulse-width modulation (DPWM)
Driver circuits
Drivers
Electric currents
Electric power
flyback converter
Inductors
Lamps
LED lamps
Light emitting diodes
light-emitting-diode (LED)
Modulation
Switches
Voltage control
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Summary: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.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2012.2183892