Single stage high power factor converter using the Sheppard-Taylor topology

Chi Kong Tse, M. H L Chow

Research output: Journal article publicationConference articleAcademic researchpeer-review

29 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. Compared to the usual boost-buck cascade operating in the first regime, the proposed converter has a wider operating range. When operating in the second regime, the modified boost stage has the ability of producing a harmonic free input current, unlike the standard boost PFC whose current always suffers a cusp distortion.
Original languageEnglish
Pages (from-to)1191-1197
Number of pages7
JournalPESC Record - IEEE Annual Power Electronics Specialists Conference
Publication statusPublished - 1 Jan 1996
EventProceedings of the 1996 27th Annual IEEE Power Electronics Specialists Conference, PESC. Part 1 (of 2) - Maggiore, Italy
Duration: 1 Jan 19961 Jan 1996

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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