Analysis of Wireless Charging Technology for Electric Vehicles Based on LCC-S Circuits

Abstract

With the rapid development of new energy vehicles, wireless charging technology has garnered widespread attention due to its convenience and safety advantages. However, issues such as low efficiency and weak misalignment tolerance remain to be addressed. This paper focuses on a wireless charging system for electric vehicles based on the LCC-S compensation topology, with a segmented rail layout as the research subject. Through Multisim circuit simulation, it investigates the impact of road coil spacing on the system’s DC current amplitude, fluctuation rate, and overall charging efficiency. A quantitative relationship model linking spacing, coupling coefficient, and output current was established through research. The variation patterns of mutual inductance, coupling coefficient, and system efficiency under different spacing were analyzed, ultimately determining the optimal coil spacing range to be 50mm to 150mm. Within this range, the system efficiency remains above 76.5%with excellent current stability, providing universal guidelines for segmented rail design. This contributes to optimizing the performance of wireless charging systems for electric vehicles and advances the application of dynamic wireless charging technology in the new energy vehicles sector.