Radiated Electromagnetic Interference Modeling for Three Phase Motor Drive Systems with SiC Power Modules

SiC power devices have become the most promising candidates to replace the Si devices. However, the fast switching speed and switching frequency of SiC power modules raise the concern of radiated electromagnetic interference (EMI). In this paper, the radiated EMI is analyzed for a three-phase motor drive system for electric vehicle (EV) and more electric aircraft (MEA) applications. The EMI noise sources generated by the isolated gate drivers as well as the SiC MOSFETs are analyzed in detail. The noise propagation paths are identified. An analytical model is built to calculate the radiated electric field emission in the frequency range of 150 kHz to 30 MHz. Simulation and experimental results show a good agreement between the proposed analytical model and the measured radiated EMI. Based on the proposed model, radiated EMI reduction techniques are discussed.