Nonlinear Model of Instability Phenomena in PFC Converters

概要

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Power factor correction (PFC) converter circuit is a non-linear system due to the contribution of the multiplier. Designers prefer to work in the direction toward putting some assumptions that reduce the system to a linear model. Then, the stability problem can be resolved and the region of stability is determined. However, in this issue, detection of a new instability phenomenon in this PFC stable region determined depending on the linear model makes us more susceptible toward it and makes clear the lack of linear models for instability investigation. This forces us to investigate these problems and to develop new approaches. Experimental results are obtained for the preregulated PFC and two-stage PFC converters. Simulation results using SCAT software verifies the experimental results. The instability regions and the borderlines are explained. Then, an exact nonlinear model performing the real operation of boost PFC converter is developed. This nonlinear model detects these instability phenomena. Furthermore, a simplified and accurate nonlinear model is developed and verified experimentally. This model is needed for the design and analysis of the stability for PFC converter. An instability map is introduced to determine the boundary between stable and unstable operation ranges.
社団法人電子情報通信学会の論文
2002-02-15