Analysis and Experimental Evaluation of Single-Switch Fast-Response Switching Regulators with Unity Power Factor

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)1260-1266
Journal / PublicationIEEE Transactions on Industry Applications
Issue number5
Publication statusPublished - Sep 1997
Externally publishedYes


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. © 1997 IEEE.

Research Area(s)

  • Fast output-voltage regulation, Power-factor correction, SSIPP