The transition from periodicity to chaos in a DC-DC Buck power converter is studied in this paper. The converter is controlled through a direct Pulse Width Modulation (PWM) in order to regulate the error dynamics at zero. Results show robustness with low output error and a fixed switching frequency. Furthermore, some rich dynamics appear as the constant associated with the first order error dynamics decreases. Finally, a transition from periodicity to chaos is observed. This paper describes this transition and the bifurcations in the converter. Chaos appears in the system with a stretching and folding mechanism. It can be observed in the one-dimensional Poincaré map of the inductor current. This Poincaré map converges to a tent map with the variation of the system parameter ks.
CitationAngulo, F; Fossas, E.; Olivar, G. "Transition from periodicity to chaos in a PWM-controlled buck converter with ZAD strategy". International Journal of Bifurcation and Chaos, 2005, Vol. 15, No. 10, p. 3245-3265.
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