Modeling of cascade buck converters

In this paper signal flow graph non-linear modeling of cascade buck converters is presented. A unified signal flow graph model of the converter is developed, and then large, small-signal and steady-state models are deduced from the unified graph. Converter performance expressions are derived. A large-signal model is developed and programmed in the TUTSIM simulator. Large-signal responses against supply and load disturbances are obtained. The validity of the proposed signal flow graph modeling is verified through PSIM simulator results.