Fast-scale bifurcation in single-stage PFC power supplies operating with DCM boost stage and CCM forward stage

Xiaoqun Wu, Chi Kong Tse, Siu Chung Wong, Junan Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

57 Citations (Scopus)


This paper describes the fast-scale bifurcation phenomena of a single-stage single-switch power-factor-correction (PFC) regulator comprising a boost stage operating in discontinuous conduction mode (DCM) and a forward stage operating in continuous conduction mode (CCM). The two stages combine into a single stage by sharing one main switch and one control loop. Using 'exact' cycle-by-cycle computer simulations, the effects of various circuit parameters on fast-scale instabilities are studied. The results are qualitatively verified by experimental measurements. This work provides a clear picture of how the variation of certain practical parameters can render such a circuit fast-scale unstable.
Original languageEnglish
Pages (from-to)341-355
Number of pages15
JournalInternational Journal of Circuit Theory and Applications
Issue number3
Publication statusPublished - 1 May 2006


  • Bifurcation
  • dc-dc converter
  • Fast-scale instability
  • Power factor correction
  • Single-stage converter

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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