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The aim of this paper is to investigate the bifurcation behavior of the Power-Factor-Correction (PFC) boost converter under the conventional average-current-mode control. The converter is operated in ...continuous-conduction mode. Boost PFC converter is a nonlinear circuit due to the contribution of the multiplier and a large duty cycle variation that reveals the difficulty of analysis. Designers preferred to work in the direction toward putting some assumptions that reduced the system to be a linear model. Then, the stability problem could be solved and the regions of stability were determined. However, instability phenomena have been detected in the regions predicted to be stable by the prior linear PFC models. This fact makes us more susceptible to these linear models, and reflects the highly needs to consider the system by a nonlinear model. This forces us to investigate these problems and to develop new approaches. The bifurcation analysis performed by computer simulation packages reveals interesting effects of variation of some chosen parameters on the stability of the converter. The results are illustrated by time-domain waveforms and phase plane curves. Experiment results confirm the simulation results with a good matching. Such an analysis allows convenient detection of the unstable phenomena in the PFC circuit and so on, prediction of stability boundaries and facilitates the selection of parameters values to guarantee stable operation.続きを見る
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