A Review of Energy-Efficient High-Voltage Boosting Techniques for Electric Vehicles Using Multiphase Interleaved Soft-Switching Converters

This review highlights the significant progress made in developing high-voltage-gain DC-DC converters for electric vehicles and renewable-energy systems. The studies collectively show that soft-switching and multiphase interleaving techniques offer substantial benefits in terms of efficiency, reduced ripple, improved thermal management, and enhanced reliability. Coupled inductors, switched capacitors, voltage multiplier cells, and quadratic structures have emerged as effective gain-extension methods that eliminate the need for extreme duty cycles. Additionally, the integration of advanced control strategies, particularly AI-based MPPT and neural controllers, further improves dynamic response and power extraction under variable operating conditions. The literature strongly indicates a shift toward hybrid designs that combine interleaving, soft switching, and intelligent control to achieve superior performance. However, certain challenges remain, including increased circuit complexity, component stress, and the need for precise design optimization. Overall, the advancements reviewed confirm that soft-switching multiphase interleaved converters represent a highly promising solution for next-generation EV powertrains and renewable-energy applications, offering a strong foundation for future innovation and practical implementation.

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