Black-Box Terminal Characterization Modeling of DC-to-DC Converters

This paper proposes a hardware-oriented modeling methodology for dc-dc converters when the information about their internal structure and parameters is not available. The proposed model is a non-terminated two-port hybrid Gij(s) parameters network built from experimental frequency response functions measured at the input and output terminals, and post-processed using system identification methods to implement the final model. The two-port nature of the model enables its simple interconnection to simulate larger distributed power systems. The paper includes the complete derivation-providing insight into the experimental measurement and model construction-and experimental validation for an open-and closed-loop buck dc-dc converter rated at 25 W, 20-to-5 Vdc. The excellent results obtained verify the proposed modeling methodology.