Regenerative Switched-Inductor/Capacitor Configuration-Based Cubic Bidirectional DC–DC Converter for EV Applications

The regenerative switched-inductor/capacitor (RSIC) network is strategically configured to recycle voltage during buck and boost modes, enabling the proposed converter to achieve a cubic-order voltage conversion ratio (VCR) in both modes of operation. The proposed structure achieves impressive performance by forming three networks during both buck and boost modes. In buck mode, the current is divided among the three networks, while in boost mode, the three networks combine the current, enabling a higher VCR. Specifically, the VCR is D3 in buck mode and (1-D)-3 in boost mode. Comparative analysis with state-of-the-art converters highlights the superior performance of the proposed topology such as fewer components, lower stress on the semiconductors, common grounding configuration and higher efficiency with a simpler design. Also, an experimental prototype of the proposed converter has been designed, developed, and validated for a power rating of 750 W, operating at a switching frequency of 50 kHz. Under nominal conditions, it achieves a high efficiency with 95% in buck mode at 350 W and 95.87% in boost mode at 400 W.