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汽车安全与节能学报

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Conducted electromagnetic interference in electric vehicle wireless charging system and its effects on system safety

GUO Yanjie1, 2, WANG Lifang1, 3*, ZHANG Junzhi2, ZHANG Yuwang1, ZHANG Yun1, LI Shufan1   

  1. (1. Key Laboratory of Power Electronics and Electric Drive, Institute of Electrical Engineering, Chinese Academy of Sciences,
    Beijing 100190, China; 2. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084,
    China; 3. Collaborative Innovation Center for Electric Vehicles in Beijing, Beijing 100081, China)
  • Received:2017-09-18 Online:2017-12-30 Published:2018-01-03

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Abstract:

The equivalent electromagnetic interference (EMI) sources were analyzed to clarify the conducted electromagnetic interference characteristics in electric vehicle (EV) wireless charging system (WCS) and its effects on system safety. WCS equivalent circuit model was established. Harmonic gains of the conducted EMI
transfer functions were studied based on the actual parameter values. The experiments were carried out to investigate the conducted EMI characteristics and their effects on system safety under the conditions of system rated state, coil large misalignment, and discontinuous conduction mode (DCM) of the rectifier. The results show that coil large misalignment and rectifier DCM would bring high frequency conducted EMI, and some measures need to be taken for EMI suppression. Meanwhile, the rectifier input inductance should be big enough to avoid conducted EMI brought by rectifier DCM, for the sake of improving system safety.

Key words: electric vehicle (EV)/ system safety/ wireless charging system (WCS)/ , conducted electromagnetic interference/ , electromagnetic compatibility (EMC)