A Novel Common Mode EMI Terminal Modeling Method of Three-phase Inverter

With high integration of power electronic inverters, the electromagnetic interference (EMI) issues are becoming more and more serious. Therefore, it is necessary to establish the precise EMI model of inverters to analyze and suppress interference. First, this paper analyzes the theory of CM terminal modeling method of inverters and compares it with lumped circuit model. Then a CM terminal modeling method of inverters by using the discrete components and CM interference sources is proposed. Only one online measurement is required during the whole modeling process, so the modeling process is simple. The error between modeling results and experimental results is less than 6dB in the range of 150kHz to 9MHz, which verifying the correctness of the modeling method.