Abstract
This paper presents an interleaved soft-switching buckconverter with coupled inductors to extend duty ratio for highstep-down voltage applications. In the proposed converter, asingle-capacitor turn-off snubber is introduced to limit rising rateof active switches to reduce turn-off loss. To handle the energytrapped in the leakage inductance of the coupled inductors, simplepassive-clamp circuits are added to the proposed converter, whichcan effectively recycle the energy and suppress voltage spike. Tohighlight the merits of the proposed converter, its performanceindexes, such as voltage gain function and component stresses, areanalyzed and compared with those of the conventional interleavedbuck converter. In this study, the prototype of the proposedconverter, input voltage of 150-200 Vdc, output voltage of 12 Vdc,and full load power of 240 W has been implemented and verified,from which experimental results have shown that 85% conversionefficiency can be achieved at the full load condition.