Generalized state-space model for the interleaved buck converter

Abstract

This paper presents a complete AC small-signal general model for the interleaved buck converter (IBC) operating in continuous conduction mode. Average state-space technique is used and the most important parasitic elements are included. A ready-to-use generalized model for n-cells structure is developed by obtaining its DC model and AC small-signal model for a certain operation point. Besides, it is presented an n-cells inductor value analysis against duty-cycle and a second-order model is derived from that, which can replace the complete model with accuracy, simplifying the dynamics analysis. Models have been successfully verified experimentally, and compared via simulation in Matlab/Simulink.