EMI Suppression Scheme Based on Spread Spectrum Technology for High Power Wireless Electric Vehicle Charging

Electromagnetic interference (EMI) has become a significant obstacle to the widespread adoption of wireless electric vehicle charging (WEVC). Spread spectrum (SS) technology is an effective way to suppress EMI, but it has received little attention in the WEVC field due to the lack of methodological guidance. Inappropriate use of SS parameters not only leads to insufficient EMI suppression but also impacts power transmission. This paper proposes a method for the application of SS modulation in WEVC, and metrics for assessing the efficacy of SS modulation. To evaluate the method, a simulation and experimental system is constructed based on a double-sided LCC (DS-LCC) topology. The results validate the effective and dependable use of SS modulation in WEVC systems, significantly reducing EMI while having little impact on power transmission.