A Comprehensive Review on Single-Stage WPT Converter Topologies and Power Factor Correction Methodologies in EV Charging

Wireless Power Transfer (WPT) particularly in the field of Electric Vehicle charging applications has wide research opportunities because of its huge growth. The power transfer efficiency is of major concern and researchers are finding ways to improve it by reducing stages of the WPT and making it better than the wired EV charging method. The increasing penetration of charging stations in the grid brings many challenges and hence to find a suitable control scheme to enhance input power quality. For the most optimal operation and comprehensive support, the charging systems must incorporate a suitable converter topology, a well-defined control strategy, and comply with all relevant grid codes and standards. For smooth and efficient functioning these features must be included in the EV charging systems. This paper presents a review of single-stage topologies and the power factor correction methods employed for EV wireless charging. An overview of different charging methods is first presented then the AC input and DC input single-stage converter are discussed, and following that methodologies for improving power factor correction are reviewed with the comparative analysis from different literatures. Finally, the challenges in single-stage wireless power transfer (SSWPT) were addressed and the future scopes were discussed which provides the future research directions.