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This paper proposes a push-pull forward three-level converter (PPF TL converter) for high-voltage fuel cell applications. It integrates the advantages of the TL converter and the PPF converter. It can operate at both three-level (3L) mode and two-level (2L) mode, so it is suitable for wide input voltage application, such as fuel cell power system. Half of the switches sustain half of the input voltage...
In this paper, an improved current-doubler rectifier with coupled inductors is proposed, which can extend duty ratio to reduce the peak current through the isolation transformer and to lower output current ripple. Additionally, passive lossless snubbers are introduced to reduce reverse recovery loss and clamp the voltage spike across the rectifier diodes. In this study, a 500 W prototype with a full-bridge...
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