Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/25408
Title: Contactless electronic ballast for high brightness LED lamps with mechanical dimming method
Authors: Qu, X
Wong, SC 
Tse, CK 
Wu, Z
Keywords: Contactless transformer
LED ballast
LED dimming
Resonance circuit
Issue Date: 2012
Source: Conference Proceedings - 2012 IEEE 7th International Power Electronics and Motion Control Conference - ECCE Asia, IPEMC 2012, 2012, v. 1, 6258907, p. 443-447 How to cite?
Abstract: Advanced techniques in light-emitting-diode (LED) light sources allow LED lighting to appear in more and more applications. Besides providing the constant driving current source, LED ballast is usually isolated for safety specifications and dimmed for energy saving. Normally, LED ballast is designed with transformer for isolation and external circuits for dimming, increasing the challenges and complexity of the ballast design. To overcome the above limitations, this paper proposed a non-electrical dimming method based on a contactless transformer, taking full use of the transformer parasitical parameters to transfer energy by resonance. By adjusting the transformer air gap mechanically, the parameters in the resonance tank will change sensitively, which can be used for dimming control without additional components and control. In some extreme conditions, the proposed ballast provides a total environmentally-shield secondary enclosure with contactless transformer. Analysis, design example and prototype verification are given for the LED ballast and dimming control.
Description: 2012 IEEE 7th International Power Electronics and Motion Control Conference - ECCE Asia, IPEMC 2012, Harbin, 2-5 June 2012
URI: http://hdl.handle.net/10397/25408
ISBN: 9781457720864
DOI: 10.1109/IPEMC.2012.6258907
Appears in Collections:Conference Paper

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