Contactless electronic ballast for high brightness LED lamps with mechanical dimming method

Xiaohui Qu, Siu Chung Wong, Chi Kong Tse, Zaijun Wu

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

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 languageEnglish
Title of host publicationConference Proceedings - 2012 IEEE 7th International Power Electronics and Motion Control Conference - ECCE Asia, IPEMC 2012
Pages443-447
Number of pages5
Volume1
DOIs
Publication statusPublished - 3 Oct 2012
Event2012 IEEE 7th International Power Electronics and Motion Control Conference - ECCE Asia, IPEMC 2012 - Harbin, China
Duration: 2 Jun 20125 Jun 2012

Conference

Conference2012 IEEE 7th International Power Electronics and Motion Control Conference - ECCE Asia, IPEMC 2012
CountryChina
CityHarbin
Period2/06/125/06/12

Keywords

  • contactless transformer
  • LED ballast
  • LED dimming
  • resonance circuit

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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