Modeling and reduction of radiated EMI for isolated power converters

Increasing switching frequency of power converters always leads to severe radiated EMI, especially with the boom of wide bandgap devices. The development of radiation model and precise extraction of radiation parameters are very important for radiated EMI analysis. This paper proposes a technique of developing radiation model and a methodology for accurately measuring the antenna impedance. Then the technique to reduce the radiated EMI is explored based on the model. Experiments are carried out to verify the theory and technique developed in this paper.