Abstract

This letter presents a single-stage soft-switched full-bridge AC-DC converter for low-voltage-high-current output applications. A phase-shifted method with a variable frequency control is used to regulate the DC bus voltage and the output voltage of the single-stage AC-DC converter. The proposed circuit topology and control scheme exhibit superior performances (i.e. high power factor, high-efficiency, and ring-free features). Correspondingly, a laboratory prototype, 500 W 5V-100A AC-DC converter, is implemented to verify the feasibility of the proposed design. Copyright © 2009 John Wiley & Sons, Ltd.

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