Abstract
This paper deals with a new high-voltage-gain zero-current switching bidirectional DC–DC converter for electric vehicles. The hard-switched non-isolated bidirectional converter integrated with auxiliary active switches and resonant elements were designed to attain the zero-current switching turn-off operation in the main IGBTs. This converter has dual characteristics as battery charge (buck) mode and discharge (boost) mode. By individual mode, all the active switches operate under zero-current switching turn-off operation for the minimized turn-off losses. The proposed converter has high voltage gain with reduced turn-off losses when operating in discharge mode and has low output voltage conversion in charge mode. The topology described with the aid of theoretical waveforms were tested using a laboratory prototype 70/300 V, 800 W system functioned under 50 kHz operating frequency.
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