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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.
Published in:
Power Electronics, IEEE Transactions on
(Volume:27
,
Issue:
11
)
Date of Publication: Nov. 2012
- Page(s):
- 4613 - 4618
- ISSN :
- 0885-8993
- INSPEC Accession Number:
- 12805018
- Digital Object Identifier :
- 10.1109/TPEL.2012.2183892
- Product Type:
- Journals & Magazines
- Date of Publication :
- 13 January 2012
- Date of Current Version :
- 20 June 2012
- Issue Date :
- Nov. 2012
- Sponsored by :
- IEEE Power Electronics Society
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