Single‐stage single‐switch PFC converter for wide‐input extreme step‐down voltage applications |
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Authors: | Esam H Ismail Mustafa A Al‐Saffar Ahmad J Sabzali Adel A Zerai |
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Affiliation: | 1. Department of Electrical Engineering, College of Technological Studies, , P.O. Box?35007 AL‐Shaa'b, 36051 Kuwait;2. Department of Electronic Engineering, College of Technological Studies, , P.O. Box?35007 AL‐Shaa'b, 36051 Kuwait |
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Abstract: | This paper presents a new single‐stage single‐switch high power factor correction 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 with the existing single‐stage single‐switch 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. 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 100‐W/24‐Vdc laboratory prototype. Copyright © 2011 John Wiley & Sons, Ltd. |
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Keywords: | fast output regulation low harmonic distortion power factor correction (PFC) single‐stage single‐switch rectifier unity power factor (UPF) |
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