Abstract
The switched-inductor structure can be inserted into a traditional Buck-Boost converter to get a high voltage conversion ratio. Nonlinear phenomena may occur in this new converter, which might well lead the system to be unstable. In this paper, a discrete iterated mapping model is established when the new Buck-Boost converter is working at continuous conduction current-controlled mode. On the basis of the discrete model, the bifurcation diagrams and Poincare sections are drawn and then used to analyze the effects of the circuit parameters on the performances. It can be seen clearly that various kinds of nonlinear phenomena are easy to occur in this new converter, including period-doubling bifurcation, border collision bifurcation, tangent bifurcation, and intermittent chaos. Value range of the circuit parameters that may cause bifurcations and chaos are also discussed. Finally, the time-domain waveforms, phase portraits, and power spectrum are obtained by using Matlab/Simulink, which validates the theoretical analysis results.
Highlights
In recent years, much attention was paid to the switchedinductor structure because of its several unique characteristics
One of the most remarkable feature of the switchedinductor structure is that it can be combined with the traditional DC-DC converters to provide new converters with a steep voltage conversion ratio [1, 2]
Very little attention was paid to complex behaviors in Buck-Boost converter combined with the switched-inductor structure
Summary
Much attention was paid to the switchedinductor structure because of its several unique characteristics. The nonlinear phenomena in the new Buck-Boost converter may be rather complex than that in the traditional converters, which will deteriorate the performance of the converter to some extent. It was demonstrated that there was various kinds of nonlinear phenomena in the traditional Buck-Boost converter [15–17]. Very little attention was paid to complex behaviors in Buck-Boost converter combined with the switched-inductor structure. For this reason, the nonlinear phenomena in a currentmode controlled Buck-Boost converter with switchedinductor structure are studied in this paper. The bifurcation diagrams and Poincare sections are drawn based on the discrete-time model, which intuitively reflect the influence of the circuit parameters on the system performance. The research result provides an important reference for engineering design and performance analysis
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