单周期控制的PFC电路切换线性模型

为了深入研究单周期控制技术的系统控制过程和工作机理,采用非线性控制理论,建立电流断续条件下boost变换器的切换线性模型并对模型进行分析.给出了boost变换器运行时三个模式的动力学方程以及各模式间的切换序列,分析了在电流断续条件下的能控性.通过和电压跟随器控制的功率校正电路输出电压作对比,表明了采用单周期控制技术后输出电压超调量更小,动态响应速度更快.分析所采用的方法同样可以用于单周期控制buck、buck-boost变换器电路,为单周期控制技术的推广提供理论依据.

The model of PFC circuit as switched linear systems with one-cycle control

For lucubrating of the principle and process of one-cycle control technology(OCC),switched linear model of boost converter is built and analyzed on DCM condition based on non-linear control theory.Three dynamic mode equations and the switch sequences in modes when boost converter in operation are also given to analyze its ability to control on DCM condition.By comparison with the output of PFC circuit controlled by the voltage follower,the results show that overshoot of output voltage gets much less,and dynamic response gets much faster.The ways adopted for analysis are also suitable for buck and buck-boost converter circuit,and provide theoretical support for the popularization of OCC technology.