In automotive high voltage (HV) electrification, the megatrends are high voltage, high switching frequency and fast switching speeds. These trends pose new challenges, since a combination of electromagnetic compatibility (EMC) and HV-safety requirements needs to be assured.

In particular, owing to the higher operation voltage, effective design of passive/active common mode filters has to cope with possible safety issues arising due to the higher energy stored in filter capacitors connected to the car chassis (i.e., the so-called CY capacitors).

The objective of the research is to develop innovative common mode filter concepts able to assure satisfactory EMC performance without compromising safety requirements. To this end, the aim is to reduce to the minimum the use of CY capacitors. Challenges are the thermal stress in filter components, especially when connected to the AC side as well as the broad band functionality of such concepts. To this aim, innovative filter concepts and strategies will be investigated.

The research is developed partly in Politecnico di Milano and partly in the German company Valeo, under the joint supervision of Prof. Flavia Grassi (DEIB) and Dr. Guido Rasek (Valeo).