A Soft-Switching Bidirectional AC/DC Converter with MERS Turn-Off Snubber Circuit and Discontinuous Current Mode

作者：Isobe Takanori^*; Kato Kyohei; Kojima Naoto; Shimada Ryuichi

来源：Electrical Engineering in Japan, 2015, 191(1): 59-68.

DOI：10.1002/eej.22679

• ac
• dc conversion
• soft switching
• grid-connected converter

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 to 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 soft-switching operation. The soft-switching operation is based on discontinuous current mode (DCM) operation and a magnetic energy recovery switch (MERS)-type turn-off snubber. This paper focuses on a modulation technique applied to this converter. Experiments with a fabricated 1-kW 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.

• 出版日期2015-4