Due to the powertrain electrification in electric and hybrid vehicles enormous challenges arise considering the EMC of these vehicles. Compared to vehicles with internal combustion engine in electric vehicle power electronic drive systems in the 100 kW range are used. These drive systems produce high broadband electromagnetic emissions (EMI), resulting in enormous challenges considering the vehicle's inner EMC. In order to provide a safe and stable parallel operation of the classical 12 V wiring system and the highvolt (HV) traction system, traction system is built up completely isolated from the 12 V system (IT-Network) and thoroughly shielded. Unfortunately, as the shaft of the electric drive is not integrated in the shielding concept, it represents a weak point. The broadband emissions of the drive inverter can flow via the shaft into the gearbox and further into e.g. wheel sensor or other parts of the 12V system. Furthermore, current measures to increase the efficiency of electric traction systems like increasing the voltage of the traction battery or decreasing the switching time of the power transistors used in the inverter result in an increase on the system's EMI. Thus, additional shielding and filtering measures have to be realized in order to meet the EMC requirements. In order to meet the challenges considering the electric vehicles EMC currently the new components, new measurement methods and new requirements considering the EMI and the immunity of the HV components are added to the automotive standards.
展开▼
