MERS方式ターンオフスナバと電流不連続モードを用いたソフトスイッチング双方向AC/DC変換回路

概要

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With an increase in renewable energy source installations in the domestic field, bidirectional ac/dc converters are attracting attention. Efficiency, power density improvement and EMI reduction are necessary for converters in this field. Using high-frequency switching can reduce the size of passive components and help achieve a high-power-density converter; however, the switching losses and EMI can increase. In this study, we propose a new bidirectional ac/dc converter circuit topology that can reduce the switching losses and EMI with a soft-switching operation. The soft-switching operation is based on the DCM (discontinuous current mode) operation and a MERS (magnetic energy recovery switch)-type turn-off snubber. This paper focuses on a modulation technique applied to this converter. Experiments with a fabricated 1kW converter were conducted, and the principles of operation were confirmed. Loss analysis indicates that inductor design is the key design issue for the proposed converter.
The Institute of Electrical Engineers of Japanの論文