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Single-stage single-switch PFC converter with extreme step-down voltage conversion ratio

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3 Author(s)
Ismail, E.H. ; Dept. of Electr. Eng., Coll. of Technol. Studies, AL-Shaa''b, Kuwait ; Al-Saffar, M.A. ; Sabzali, A.J.

This paper presents a new single-stage singleswitch (S4) high power factor correction (PFC) AC/DC converter suitable for low power applications (< 150 W) with a universal input voltage range (90-265 Vrms). The proposed topology integrates a buck-boost input current shaper followed by a buck and a buck-boost converter, respectively. As a result, the proposed converter can operate with larger duty cycles compared to the exiting S4 topologies; hence, making them suitable for extreme step-down voltage conversion applications. Several desirable features are gained when the three integrated converter cells operate in discontinuous conduction mode (DCM). These features include low semiconductor voltage stress, zero-current switch at turn-on, and simple control with a fast well-regulated output voltage. A detailed circuit analysis is performed to derive the design equations. The theoretical analysis and effectiveness of the proposed approach are confirmed by experimental results obtained from a 35-W/12-Vdc laboratory prototype.

Published in:

Power Electronics and Drive Systems, 2009. PEDS 2009. International Conference on

Date of Conference:

2-5 Nov. 2009