Simulation of shielding performance against near field coupling to EMI filter for power electronic converter using FEM
When designing an Electromagnetic interference (EMI) filter for power electronic converters, we should consider the shielding performance against the external near field coupling to the EMI filter as well as the attenuation performance. In this paper, we studied the validity of the Finite Element Method (FEM) simulation of the EMI filter for predicting the shielding performance before a trial manufacture. First, we created models of capacitors and common mode choke coils which can simulate their impedance characteristics. Next, using these component models, the assembled EMI filter model was created. We compared the measured and simulated results to verify the model. The shielding performance was evaluated using a loop coil as an external near field source. Consequently, the simulated results agreed with the measured results well.