Study on conducted EMC of electric vehicle

JI Shi-ming，LIU Da-liang
（Key Laboratory of E&M，Ministry of Education & Zhejiang Province，
Zhejiang University of Technology， Hangzhou 310032，China）

Abstract：  The electric vehicle generates more electromagnetic interference than the traditional cars. Especially，the power train system' common mode current affect the vehicle's electronic equipment seriously and radiate strong electromagnetic interference to the ambient environment. In order to reduce the magnetic radiation through the suppression of the common mode current，the resistance coupling，capacitive coupling and inductive coupling were introduced，and the suggestions of reducing the inductive coupling and capacitive coupling in the electric vehicle routing system were proposed. The Stray capacitance model between the battery pack and chassis was established. The battery's physical structure and circuit model were both considered during the establishment. Importantly，the source and propagation path of the common mode interference was analyzed. The inhibiting methods of the common mode interferences were proposed. The experiments result verifies that magnetic radiation is reduced through the suppression of the common mode current of the power train system，and the vehicle's magnetic radiation meets the requirement of GB/T 18387 .
Key words： electric vehicle； electro-magnetic compatibility（EMC）； conducted interference； inhibition of the common mode current