Study and Design of a Non-Isolated Bidirectional DC-DC Converter Based on a Switched Inductor and Voltage Multiplier Cell for Renewable Energy Applications

In this paper, a bidirectional converter with low voltage stress is evaluated. The converter is based on a switched inductor technique combined with a switched capacitor in a voltage multiplier structure, enabling a higher voltage gain while maintaining reduced stress on the switching components. Both dynamic and static modeling are developed to provide a comprehensive understanding of the converter behavior and a control strategy is proposed to ensure stable operation under varying load and input conditions. To validate the theoretical analyses, a hardware prototype was designed and implemented, operating at 80-500 W with an input to output voltage range of 72-400 V. Experimental tests were conducted under different operating conditions, confirming the effectiveness of the proposed converter. A peak efficiency of 98.4\% was achieved at 250 W, demonstrating the high performance of the converter. Additionally, the ability to reverse power flow online without requiring shutdown enhances its applicability in renewable energy systems and energy storage interfaces.