Modeling of Low-Frequency Radiated EMI From the Inductors of Power Converters in Electric Vehicles

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Abstract
This paper first identifies the power inductor as a major radiated EMI source in a power converter in electric vehicles at low frequencies. To understand the radiation mechanism and predict radiated EMI for the power converter, the radiation model is developed for the inductor based on electric dipole moment theory. The inductor’s CM voltage is identified as the dominant contributor to the radiated EMI at low frequencies. The impacts of the PCB ground and CISPR25 EMI measurement setup for electric vehicles on the radiated electric field were also investigated. The proposed prediction technique is experimentally verified and extended to inductors with different shapes.
Funding Information
  • Monolithic Power Systems, Inc.

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