Effective EMI filter design method for three-phase inverter based upon software noise separation

This paper presents a new design method of three-phase inverter for motor drives using software noise separation method. Therefore, no hardware noise separator is required. Moreover, the presented EMI filter design approach provides systematic design procedure and therefore trial-and-error overhead is not required and thereby shortening the development time and saving the cost. The presented method determines common-mode choke and differential-mode choke based upon the required impedance of to attenuate the noise. A three-phase inverter for inductor motor drives is used as the EUT and the related conductive EMI filter is designed and verified. It will be shown that EMI filter designed by this systematic design method effectively attenuates the EMI components to meet the requirement of EN 55011.