The prediction of conducted EMI on switched mode power supply based on full-circuit simulation

The prediction technology of the conducted EMI of SMPS is an effective way to reduce the EMI debug period and costs. The traditional prediction technology mainly focused on the self-model of the component and paid little attention to the electromagnetic coupling between the components in SMPS. This paper proposed an optimal prediction method with near-filed electromagnetic coupling parameters in which the electromagnetic coupling parameters are got by HFSS simulation or test results. Finally, the consistency between the prediction result and the prototype test result of the conducted EMI verifies the optimal prediction method to be correct and flexible.