快时标意义下平均电流控制的Boost PFC分析与仿真

利用仿真软件Matlab/Simulink对工作于电流连续模式下的电压控制型boost变换器建立了仿真模型并对其非线性现象进行研究。根据其结构、电路参数及不同的工作条件,该模型分别从时域与相图的角度分析了boost变换器中的分岔与混沌现象。通过计算机仿真,以电解电容和升压电感作为分岔参数,观察其混沌现象及系统输出特性,在电流离散迭代映射图中观察到了系统由稳定到混沌的演化过程。所有仿真结果均与以往的理论分析相符,从而验证了该模型的合理性和可行性。

Simulation of boost converter under average-current-mode control and study of bifurcation and chaos in fast-time scales

For voltage-mode control Boost converter in continuous-conduction mode,a simulation model of boost converter was constructed based on Matlab/Simulink,which could be used for studying nonlinear dynamics phenomena in boost converter.According to topologies,circuit parameters and actual operation status of boost converter,the phenomena of bifurcation and chaos in boost converter could be analyzed both in time domain and V-I phase space with this model.Based on the computer simulation,the chaotic phenomena and the output performance of the Boost converter were obtained with input voltage and output capacitance as bifurcation parameters.The transforming pattern of system behavior from steady-state previous theoretic analysis,thus the correctness and feasibility of the model is verified.Further more,this modeling method is suitable for other DC-DC converters,and has important significance.