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.
Original language | English |
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Title of host publication | Conference Proceedings - 2012 IEEE 7th International Power Electronics and Motion Control Conference - ECCE Asia, IPEMC 2012 |
Pages | 443-447 |
Number of pages | 5 |
Volume | 1 |
DOIs | |
Publication status | Published - 3 Oct 2012 |
Event | 2012 IEEE 7th International Power Electronics and Motion Control Conference - ECCE Asia, IPEMC 2012 - Harbin, China Duration: 2 Jun 2012 → 5 Jun 2012 |
Conference
Conference | 2012 IEEE 7th International Power Electronics and Motion Control Conference - ECCE Asia, IPEMC 2012 |
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Country/Territory | China |
City | Harbin |
Period | 2/06/12 → 5/06/12 |
Keywords
- contactless transformer
- LED ballast
- LED dimming
- resonance circuit
ASJC Scopus subject areas
- Control and Systems Engineering
- Electrical and Electronic Engineering