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Aiming for converters with high efficiency and high power density demands converter topologies with zero-voltage switching (ZVS) capabilities. This paper shows, that in order to determine whether ZVS is provided at a given operating point, the stored charge within in the MOSFETs has to be considered and the condition LI 2 ≥ 2QossVDC has to be fulfilled. In the case of incomplete soft-switching, non-zero losses occur which are analytically derived and experimentally verified in this paper. Furthermore, the issue of non-ideal soft-switching behavior of Si super-junction MOSFETs is addressed.

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