Modeling and Analysis of EMI of Full-bridge Inverter for LCC-S Compensated WPT System

摘要

Aiming at the electromagnetic interference (EMI) problem of LCC-S compensated wireless power transfer (WPT) system for electric vehicles (EV), the EMI model of this system is established, and then EMI in the start-up and steady-state processes is analyzed. The analysis shows that the main reason of EMI problem is the distortion of output current of inverter. In addition, the conduction state of diode during switching also leads to EMI. An experimental setup of LCC-S compensated WPT system with 1kW output power is constructed to verify Modeling feasibility. Experimental results shows that the EMI intensity during the start-up process is nine times as big as that of steady-state process, which provided the basis for the EMC design of the system.