Resonant assisted buck converter for offline driving of high brightness LED replacement lamps

Xiaohui Qu, Siu Chung Wong, Chi Kong Tse

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

1 Citation (Scopus)


LEDs are prospective successors of incandescent lamps with high efficacy and long lifetime. To improve the overall luminair efficacy and lifetime, the power efficiency and lifetime of LED ballast become important factors. Efficiency gain in transformerless power converter appears attractive for applications without isolation. Driving solid-state LED bulbs such as in PAR30 style from universal mains necessitates a high voltage step-down ratio to an output voltage of about 10-20 V, which is very common in industrial applications. Traditional step-down PWM buck power converter may suffer from a poor efficiency due to long diode freewheeling at a small duty cycle. In this paper, we propose a resonant assisted buck converter to achieve high voltage step-down ratio and high converter efficiency, whilst it can work with existing dimming drivers. The performance of the proposed LED driver is verified by a prototype ballast.
Original languageEnglish
Title of host publication2010 IEEE Energy Conversion Congress and Exposition, ECCE 2010 - Proceedings
Number of pages5
Publication statusPublished - 20 Dec 2010
Event2010 2nd IEEE Energy Conversion Congress and Exposition, ECCE 2010 - Atlanta, GA, United States
Duration: 12 Sep 201016 Sep 2010


Conference2010 2nd IEEE Energy Conversion Congress and Exposition, ECCE 2010
Country/TerritoryUnited States
CityAtlanta, GA

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment

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