Minimum Active Switch Requirements for Single-Phase PFC Rectifiers Without Electrolytic Capacitors

Sinan Li, Wenlong Qi, Siew-Chong Tan, Jiayang Wu, S. Y. Ron Hui

Research output: Contribution to journalArticlepeer-review

27 Citations (SciVal)


Active pulsating power buffering (PPB) function can effectively reduce the twice-line frequency energy storage requirement in a single-phase rectifier. Existing single-phase solutions with active PPB must utilize more than two active switches in their circuits. Compared with conventional single-active-switch solutions without active PPB (e.g. a boost PFC rectifier), the cost of additional semiconductor switches and gate drive circuitry in an active PPB-based rectifier may not be justified for low power applications. This paper presents a family of single-switch single-phase rectifier with active PPB. Taking advantage of the on-time and off-time of a single switch, the proposed rectifiers are formulated by merging two converters which are respectively duty and frequency controlled. The steady-state characteristics of these converters are analyzed. A step-by-step design procedure is provided, and an active control method for limiting the maximum switching frequency for wide-load-range operation is presented. A 100-W prototype is built for demonstration of the proposed single-switch rectifier concept. It is envisaged that this concept, when combined with other circuit formulation techniques, e.g., partial power processing, dc-voltage feedback, may lead to new derivatives of single-switch rectifiers with more advanced features.
Original languageEnglish
Pages (from-to)1-13
Number of pages13
JournalIEEE Transactions on Power Electronics
Early online date6 Sept 2018
Publication statusE-pub ahead of print - 6 Sept 2018


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