The University of British Columbia

Average-value modeling of DC-DC converters is an indispensable tool for analysis of power electronic systems. However, analytical derivation of accurate models may be quite challenging especially when multiple modes and the circuits' parasitics are considered. Recently, a computer-aided average-value modeling approach has been proposed in the literature, wherein the average model has a well-defined structure and is constructed with the assistance of the detailed simulation. This paper extends the parametric approach by appropriately including the multi-input source and output dynamics. The approach is based on corrected state-space average model, where the so-called duty-ratio constraint and correction matrix are expressed as nonlinear algebraic functions of the duty cycle and the switching-stage dynamic impedance. The proposed model is shown to be accurate in predicting large-signal time-domain transients and small-signal characterization.