IMPACT OF ELECTROMAGNETIC INTERFORANCE FROM POWER INVERTER DRIVE SYSTEM ON BATTERIES IN ELECTRIC VEHICLE

摘要

EMI is a major challenge to design of high power drive system in EVs due to large dv/dt and di/dt outputs of power devices in power inverter and/or converter, which can generate conducted DM and CM current through parasitics to interfere key components such as batteries and drive motors, low voltage system in EVs and nearby vehicles. The impact of conducted EMI from the inverter of ac motor on lithium batteries in EVs is present in paper. DM and CM current paths flowing to batteries are analyzed through the modeled equivalent circuits. A SPICE model of the power drive system and a test platform are built to verify the impact of EMI from the power drive system on the lithium-ion batteries. The results show that the batteries voltage fluctuation range without filter due to DM and CM current is higher than that with filter.