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Dynamics and Modeling of Buck-Boost Converter with Switched Capacitor Network

Due to wide application of switched capacitor network in power electronic circuits, Buck-Boost converter with switched capacitor network could get a better voltagedrop effect with the same duty ratio and the same input voltage. This paper analyzes the bifurcations in peak-current-mode controlled Buck-Boost converter with switched capacitor network. The accurate discrete-time model of the converter is established. Then, the bifurcation diagram and its corresponding Lyapunov exponents are obtained by numerical simulation with the load resistor as the bifurcation parameter, and the stability of the system is analyzed by studying the locus of eigenvalues. Finally, the correctness of the dynamical analysis of the converter is verified through experimental observations. Results obtained indicate that, with the variation of the load resistor, the converter can shift among stable period region, robust chaos region in continuous conduction mode, and intermittent chaos region in discontinuous conduction mode.