摘要

In order to suppress the electromagnetic interference (EMI) in electric vehicle (EV) and consequently improve the stability and safety of EVs, we established equivalent circuit models of insulated gate bipolar transistor (IGBT) and pulse width modulation (PWM) inverter that took stray parameters into consideration. Based on the models, the interference propagation gains were calculated to estimate the influences of IGBT on other setups. Furthermore, the three-phase inverter used in EV was analyzed by simulation to get both time-domain and frequency-domain characteristics of interferences from the inverter's output differential mode (DM) voltage and its common mode (CM) current. The effects of IGBT switching, PWM control strategy, and propagation path impedances on the interference characteristics were also analyzed through simulations and practical EV experiments. It is obtained that the inverter's DM EMI is determined by IGBT switching processes and PWM control strategy, while its CM EMI is basically caused by the non-zero sum of three-phase PWM pulses, and it is affected more by the impedance of its propagation paths. The results have laid a foundation for the analysis and suppression of EV EMI.

  • 出版日期2014

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