Mathematical Modeling of Differential Mode Conducted Emission Noise for Three Phase VSI

The increasing use of Wide Band Gap (WBG) devices enhanced the converters' power density and switching frequency, but a moderate amount of parasitics cause significant Electromagnetic Emission. The present paper deals with the mathematical modeling of Differential Mode (DM) conducted emission noise source and it's propagation path for single-leg and three-leg operation of three-phase Voltage Source Inverter (VSI). The achieved mathematical expression can predict the peak frequency for DM noise. The prediction of peak frequency for DM noise is validated in simulation. A 10kW, SiC based inverter is built and hardware test setup is established and the mathematical analysis is verified.