Conductive EMI analysis and suppression technology of electric vehicle driving system

With the electric vehicle drive system running electromagnetic compatibility problems become more and more serious, how to effectively suppress the conducted interference problem has become a technical problem. In this paper, the mechanism and the coupling path of conducted EMI in EV drive system are analyzed, and the suppression effect of electromagnetic interference is discussed from the aspect of safety capacitance. Then, according to the interference limit stipulated by national standard GB 9254-2008, after the initial disturbance of the system and access safety capacitance common-mode/differential mode interference simulation. Through the test, the interference effect of different connection modes of the safety capacitor is obtained, which is very important for the EMI suppression of the drive system of the electric vehicle.