EMC and safety in vehicle drives

This paper provides theoretical and experimental discussions on conducted electromagnetic interference (EMI) emissions in the automotive applications. These issues are even more relevant (and the relative regulations more severe) as today´s vehicles are equipped with a large number of sensitive electronic communication and control systems together with several switching power converters. As example it is shown the conducted emission of an electric vehicle in absence and in presence of filter. When no EMI filter is connected, the electric vehicle cannot meet the conducted emission limits prescribed by IEC 61851-21 regulations. With the EMI filter applied, it will be shown the attenuation of conducted emission voltage. CEI EN 61800-3 legistation was used for the radiated emission limits. The measurements are carried out in a semi anechoic chamber with ferrite tiles.