In order to gain a deeper understanding of the dynamic characteristics of the PFC converter based on UC3854A control and study the influence of system parameter changes on the bifurcation phenomenon in the converter, the slow-time-scale bifurcation and chaos in the converter were simulated using Matlab software on the basis of establishing a double-closed-loop mathematical model of the Boost PFC converter. Based on the simulation of the slow-time-scale bifurcation phenomenon in the PFC converter, the influence of system parameter changes on the bifurcation point was analyzed and verified by simulation. The simulation results clearly show the influence of the amplitude change of the input rectified voltage on the system bifurcation point. Abstract: In order to better understand the dynamics characteristic of power factor correction converter based on UC3854A, and make the way that parameters change influences the bifurcation phenomena of the system clearly. The math model of the two closed loop circuits to the Boost PFC (Power Factor Correction) converter controller was built. Then, with the help of Matlab, the simulation for nonlinear phenomena such as chaos and slow-scale bifurcation in the PFC converter was made. Finally the factors that have influence to the phenomenon of bifurcation under slow-scale in PFC converter were analyzed. The simulation results clearly show the parameters change influences the bifurcation point of the system.
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