A fully soft-switched extended-period quasi-resonant power-factor-correction circuit

S. Y.R. Hui, Ka Wai Eric Cheng, Saligram R. Narayana Prakash

Research output: Journal article publicationJournal articleAcademic researchpeer-review

44 Citations (Scopus)


This paper presents the design criteria, procedure, and implementation of a soft-switched power-factor-correction (PFC) circuit based on the extended-period quasi-resonant (EP-QR) principles. All power electronic devices including switches and diodes in the circuit are fully soft switched. The design method is demonstrated in a prototype circuit. The operating principles are confirmed with computer simulation and experimental results. A comparison of the EP-QR operation and zero-voltage-transition (ZVT) pulse-width modulation (PWM) method, supported with simulation and measurements, is included.
Original languageEnglish
Pages (from-to)922-930
Number of pages9
JournalIEEE Transactions on Power Electronics
Issue number5
Publication statusPublished - 1 Dec 1997
Externally publishedYes


  • Power harmonics
  • Power-factor correction
  • Soft switching

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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