EMI Measurement and Reduction for SiC MOSFET based Motor Drivers of Electric Vehicles

The SiC MOSFET based motor drivers is widely ultilized in 800V high voltage electric vehicles platform. This paper study on the EMI measurement and reduction of SiC MOSFET based electric vehicles motor drivers. The measurement include radiated emission, conducted emission and shaft voltage. Based on the measured results, the low-cost EMI reduction schemes are studied, which include high-voltage circuit shield, low-voltage circuit shield, filtering and using shield CAN cable. Experimental results show that the EMI has significant reduction with using the proposed schemes.