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This article has been retracted as it is essentially identical in content with a previously published paper titled “A Demagnetization Circuit for Forward Converters,” by G. M. Ponzo, G. Capponi, P. Scalia, and V. Boscaino. This manuscript was published in the Proceedings of the 6th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology, 2009 (ECTI-CON 2009).

Advances in Power Electronics
Volume 2012 (2012), Article ID 259756, 12 pages
Research Article

A High-Efficiency, Low-Cost Solution for On-Board Power Converters

Power Applications Laboratory, Department of Electrical, Electronics and Telecommunications Engineering, University of Palermo, Viale Delle Scienze, Building 9, 90128 Palermo, Italy

Received 18 June 2012; Accepted 5 September 2012

Academic Editor: Neville Watson

Copyright © 2012 V. Boscaino and G. Capponi. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Wide-input, low-voltage, and high-current applications are addressed. A single-ended isolated topology which improves the power efficiency, reduces both switching and conduction losses, and heavily lowers the system cost is presented. During each switching cycle, the transformer core reset is provided. The traditional tradeoff between the maximum allowable duty-cycle and the reset voltage is avoided and the off-voltage of active switches is clamped to the input voltage. Therefore, the system cost is heavily reduced and the converter is well suited for wide-input applications. Zero-voltage switching is achieved for active switches, and the power efficiency is greatly improved. In the output mesh, an inductor is included making the converter suitable for high-current, low-voltage applications. Since the active clamp forward converter is the closest competitor of the proposed converter, a comparison is provided as well. In this paper, the steady-state and small-signal analysis of the proposed converter is presented. Design examples are provided for further applications. Simulation and experimental results are shown to validate the great advantages brought by the proposed topology.