Abstract
This paper presents an isolated bidirectional interleaved converter with minimum active switches to achieve high conversion ratio. The proposed converter has symmetric structure for easy control, and incorporates two coupled inductors for galvanic isolation and high voltage ratio achievement. A dual-inductor-capacitor-diode (LCD) snubber with common resonant inductor at low-voltage side is in charge of leakage energy recycling for efficiency improvement. In addition, the converter can obtain interleaved terminal current at low-voltage side for lowering current ripples, no matter in boost mode or buck mode. Finally, a 400-W prototype is built for validation, where the experimental results indicate that the highest efficiencies in boost and buck modes are 95.5% and 95.4%, respectively.
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