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A Soft-Switched Three-Port Bidirectional Converter for Fuel Cell and Supercapacitor Applications

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4 Author(s)
Tao, H. ; Group of Electromechanics & Power Electron., Eindhoven Univ. of Technol. ; Kotsopoulos, A. ; Duarte, J.L. ; Hendrix, M.A.M.

This paper presents a zero-voltage-switching (ZVS) three-port bidirectional converter for fuel cell and supercapacitor applications. A simple and effective method to extend the soft-switching range is proposed, especially for the three-port active-bridge topology. By continuously adjusting the duty cycle on the supercapacitor side H-bridge according to the supercapacitor voltage level, soft-switching conditions are achieved over the full operating range due to the equivalent volt-second products applied to the transformer over half the switching period. Detailed analysis is provided for both the two-port and the three-port converters. Furthermore, a dual PI-loop based control strategy is proposed to achieve constant output voltage and precise power flow management, as well as soft-switching. The converter is implemented and tested

Published in:

Power Electronics Specialists Conference, 2005. PESC '05. IEEE 36th

Date of Conference:

16-16 June 2005

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