High Efficiency and High Voltage Conversion Ratio Bidirectional Isolated DC–DC Converter for Energy Storage Systems

In this paper, a novel high-efficiency bidirectional isolated DC–DC converter that can be applied to an energy storage system for battery charging and discharging is proposed. By integrating coupled inductor switched-capacitor voltage doubler, the proposed achieve isolation power flow. The topology comprises five switches common core uses only set of complementary pulse-width-modulated signals control high gain without requiring turn ratios or excessive duty cycles. Moreover, recover leakage inductance improve conversion efficiency. main exhibit zero-voltage switching, which reduces switching losses. A 500-W used verify feasibility through theoretical analysis experiments. experimental results indicate highest efficiency in step-up step-down modes 97.59% 96.5%, respectively.