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.