Wireless Charging Technology for Electric Vehicles Based on Efficient Magnetic Coupling Technology

Abstract

As the electric vehicle industry rapidly develops, the problems of cumbersome operation and insufficient anti-offset capability of traditional wired charging technology are becoming increasingly prominent. Wireless charging technology, as an innovative solution to range anxiety, has received widespread attention. To raise the performance and efficiency of wireless charging systems for electric vehicles, an improved double-layer orthogonal DD coil structure is developed, and an efficient magnetic field-coupled wireless energy transmission system based on bipolar coupling is established. Practical application denoted that the efficiency of the system reaches 92.35% at a power of 3 kW and remains at 87.64% at 9 kW. The power fluctuation rate is less than 4.30%, and the dynamic response time is shortened to 20.50 ms. Through magnetic field closed-loop control and dynamic parameter optimization, the system's environmental adaptability (operating temperature range −20~85 ºC) and reliability (mean time between failures, MTBF 50,000 hours) have been improved. This study provides theoretical support and engineering practice reference for the large-scale application of wireless charging technology for electric vehicles and promotes the commercialization process of wireless charging technology.