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Step-Down Converter With Efficient ZVS Operation With Load Variation

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1 Author(s)
Sung-Sae Lee ; Korea Aerospace Research Institute, Daejeon, Korea

A new step-down converter is presented. It is composed of an auxiliary switch, a diode, and a coupled winding to the buck inductor in the conventional buck converter. By transferring the buck-inductor current to the coupled winding in a very short period, the negatively built-up leakage inductor current of the buck winding guarantees the zero-voltage switching (ZVS) operation of the buck switch in all load conditions. Furthermore, since the negatively built-up leakage inductor current is minimized after the zero voltage of the buck switch is achieved, the unnecessary current build-up and the conduction loss are minimized. Therefore, efficient ZVS operation with load variation is achieved. The operation principle, ZVS analysis, design, and experimental results of the proposed converter are presented.

Published in:

IEEE Transactions on Industrial Electronics  (Volume:61 ,  Issue: 1 )