Abstract

Inductive wireless power transfer charging for electric vehicles encounters a significant challenge due to heightened common-mode current, impacting safety and electromagnetic interference (EMI) emissions. This study introduces an innovative inverter topology tailored specifically for inductive wireless power transfer charging. The novel topology aims to lower common-mode voltage while entirely eliminating common-mode current generation. By incorporating an extra capacitor and discrete diode, the proposed inverter topology maintains an equivalent number of power switches as the conventional H-bridge inverter. Utilizing theoretical analysis, simulation and experiments, the study comprehensively compares the proposed inverter with the established traditional inductive charging system. Evaluation factors encompass functionality, common-mode voltage and current behavior, power losses, and overall efficiency. The results unequivocally showcase the benefits of the proposed inverter. Notably, it successfully suppresses common-mode current, thereby enhancing safety and reducing EMI emissions. Additionally, the proposed topology demonstrates heightened efficiency compared to the traditional inverter. In sum, these findings underscore the significant advantages of the suggested inverter, highlighting its potential to mitigate common-mode current challenges and elevate operational efficiency.