Analysis for the EMI measurement and propagation path in Hybrid Electric Vehicle

Power electronic equipment are added to Hybrid Electric Vehicle (HEV) comparing to traditional vehicles. The electromagnetic interference (EMI) produced by these equipment is extraordinarily serious, which will have influence on equipment that are attached to them. In this paper, measurement and comparisons on the conducted interference current on the main lines of vehicle-mounted high-power DC power converter are completed; mechanism and path of propagation are analyzed. It is concluded that one part of interference on DC power converter system comes from its own main circuit, another part comes from the motor driver; the propagation of the interference is realized by conducted coupling of common source.