New single-stage PFC regulator using the Sheppard-Taylor topology

Chi Kong Tse, M. H.L. Chow

Research output: Journal article publicationJournal articleAcademic researchpeer-review

58 Citations (Scopus)


This paper describes a new usage of the dc/dc converter developed by D. I. Sheppard and B. E. Taylor in 1983 for achieving high power factor and output regulation. This converter may be viewed as a cascade of a modified boost stage and a buck stage, with the two stages sharing the same active switch. Two possible operation regimes are described. In the first regime, the converter's input part, which is a modified boost converter, operates in discontinuous mode, and the output part, which is a buck converter, operates in continuous mode. In this regime, high power factor is naturally achieved, and the output voltage is regulated by duty-cycle modulation via a simple output feedback. In the second regime, the input part operates in continuous mode, and the output part operates in discontinuous mode, with duty-cycle modulation maintaining a high power factor and frequency modulation regulating the output. Some comparisons between the Sheppard-Taylor converter and conventional boost and buck cascade are given in the paper.
Original languageEnglish
Pages (from-to)842-851
Number of pages10
JournalIEEE Transactions on Power Electronics
Issue number5
Publication statusPublished - 1 Dec 1998


  • Circuit topologies
  • Power factor correction
  • Switching regulators

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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