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Soft Switching Bidirectional Converter for Reflex Charger With Minimum Switches

In this article, a new soft switching bidirectional dc–dc converter for battery charger application based on reflex charge technique is proposed. The proposed bidirectional dc–dc converter applies flyback converter to provide negative current pulses for reflex charge method while providing zero-voltage switching (ZVS) for the buck converter switch which is used to control charging current. The flyback converter switch is also soft switched. Flyback converter switch operates under zero-current switching (ZCS) turn-on and ZVS turn-off conditions. The proposed bidirectional converter applies only two switches to implement a fully soft switched pulsewidth modulation (PWM) bidirectional converter. Hence, the proposed topology provides a fully soft switched bidirectional converter with minimum number of switches using PWM control method. The proposed converter is implemented, analyzed, and experimental results are presented. The experimental results verify the theoretical analysis presented in the article. Efficiency comparison performed shows proper efficiency of proposed converter while applying minimum number of switches.