Modeling method of stray magnetic couplings in an EMC filter for power electronic devices

This paper proposes a remarkably efficient modeling method of stray magnetic couplings in an Electromagnetic Compatibility (EMC) filter that focuses on the dominant magnetic field in a power electronic device. The proposed modeling method was applied for simulating the filter performance of an EMC filter for a Silicon Carbide (SiC) solar inverter, and its effectiveness was verified through a comparison of the measurement and simulation results. With the proposed modeling method, the influence of the stray magnetic couplings on the filter performance can be predicted well. Further, the results matched those of the measurement and simulation with a conventional modeling method. Accordingly, the number of stray magnetic couplings required for accurate prediction can be dramatically reduced from 325 to just one.