A new high-frequency simulation model for multi-winding transformers used in switched-mode power supplies

In this paper, a new high-frequency simulation model for multi-winding transformers used in switched-mode power supplies (SMPS) is presented. The model can be constructed from simple impedance measurements on a transformer and using information that can typically be found on component datasheets. The model can be applied to the design of an SMPS to determine peak voltage and current stress on the switching device, and to predict conducted emissions for electro-magnetic compatibility (EMC). The model can be implemented through any commercially available circuit simulation package. Simulation and experimental results obtained on a high-voltage one-switch and two-switch Flyback SMPS are provided to validate the modeling method.