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The Accurate Modeling and Stability Analysis for Flyback Converter Based on Describing Function Method

Flyback converter is widely used in switching power supply and the stability analysis for it is critical. However, the result of the stability analysis method based on the traditional linear small-signal model is not accurate enough because the nonlinear characteristics of the switching process are ignored in the analysis process. In this paper, the accurate modeling and stability analysis for flyback converter are carried out by using describing function method. Firstly, the linear and nonlinear small-signal model are respectively established for flyback converter. Following that, the stability criterions are derived from the two above models accordingly. Finally, according to the two criterions, the stability analysis results are respectively presented. It has been proved that the mentioned stability analysis method is precise by comparing the simulation and experimental results.