Analysis and experimental evaluation of single-switch fast-response switching regulators with unity power factor

K. W. Siu, Y. S. Lee, Chi Kong Tse

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)


Based on a single-stage isolated power-factor-corrected power supply (SSIPP or S2IP2) employing a boost power-factor-correction (PFC) cell, the relationship between the input line voltage and line current of such switching regulators is studied. The conditions for unity power factor are derived. A control scheme to reduce the switch voltage stress while maintaining unity power factor is proposed. Practical implementation of the proposed control scheme is discussed. It is found that, by adding a simple input voltage feedforward to a conventional PWM controller, the switch voltage stress can be much reduced, while keeping the power factor very close to unity. Analysis and experimental results indicate that such a scheme is effective and feasible.
Original languageEnglish
Pages (from-to)1260-1266
Number of pages7
JournalIEEE Transactions on Industry Applications
Issue number5
Publication statusPublished - 1 Dec 1997


  • Fast output-voltage regulation
  • Power-factor correction

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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