Abstract
This paper presents an impedance shaping technique to reshape the common mode (CM) impedance profile of three phase common mode choke. The CM impedance offered by a designed CM choke with specific core area and number of turns is reshaped using CMIS choke. CM noise in a two level voltage source inverter (TL-VSI) has dominant frequency components near inverter switching frequency ( $F_{sw}$ ). Attenuation of these dominant frequency components demand high impedance at $F_{sw}$ . A designed CMIS choke offers high CM impedance for $F_{sw}$ compared to CCM choke. The proposed three phase CMIS choke is a passive CM noise attenuation technique that attenuates the dominant $F_{sw}$ components. The CM attenuation performance of passive EMI filter with CMIS choke and CCM choke are compared for TL-VSI.
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