New simplified model for predicting conducted EMI in DC/DC converters

EMI modeling of power converters is crucial to develop EMI attenuation solutions. Recently, more and more modeling and mathematical analysis of electromagnetic interference (EMI) sources and propagation path had allowed a better understanding of EMI generation mechanism. Calculation times and accuracy determine the efficiency of EMI models in the studied circuit frequency range. In this paper, a priori model (circuit-based model) for predicting the spectra of conducted interferences in a DC/DC converter was developed in the scope of reducing calculation times of temporal simulations. The proposed new approach for high-frequency disturbance estimation is based on the knowledge of circuit parasitic elements and semiconductor devices parameters. A good tradeoff between simulation time and accuracy was registered; this is considered as an interesting step for power converters design.