Isolated PFC pre-regulator for LED lamps

Xiaohui Qu, Siu Chung Wong, Chi Kong Tse, Xinbo Ruan

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

28 Citations (Scopus)


The efficiency and lifetime of light-emitting-diode (LED) lamps are approaching and exceeding that of fluorescent lamps. LED light sources are finding more applications than conventional light bulbs due to their compactness, lower heat dissipation, real-time color changing capability and most importantly, long life which is much longer life than that of conventional offline power converters. Conventional power converters normally use high voltage electrolytic capacitors as energy storage element which could have the shortest lifetime when compared to other components of the LED lighting system. In this paper, a new isolated PFC power pre-regulator is proposed. The pre-regulator allows the charge storage capacitor to be positioned on the secondary side of the isolation transformer. Longer lifetime low voltage and high capacitance value capacitors can therefore be used to extend the overall lifetime of the LED lighting system. Steady-state state-space averaging analysis is preformed for designing the converter. A prototype converter is built to verify performance of the proposed PFC LED preregulator.
Original languageEnglish
Title of host publicationProceedings - 34th Annual Conference of the IEEE Industrial Electronics Society, IECON 2008
PublisherIEEE Computer Society
Number of pages8
ISBN (Print)9781424417667
Publication statusPublished - 1 Jan 2008


  • Light-emitting-diode lighting
  • Offline LED driver
  • Power-factor-correction current regulator

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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