DC——DC开关转换器快速建模的统一方法Ⅱ:不连续导通工作情况下的建模

Unified Method for Fast Modelling of DC-DC Switching Converter Ⅱ: Modelling in Discontinuous Conduction Mode

本文提出了工作于不连续导通情况下DC-DC开关转换器快速建模的统一方法,导出了三种(Buck,Boost,Buck-Boost)开关转换器的DCM模型,对这一模型进行了直流分析、交流小信号分析和规范化模型参数的计算,所得结果与利用状态空间平均法所得结果完全一致,但本文所提出的方法优于流行的状态空间平均法,其概念清楚,计算简单。

A unified method for fast modelling of DC—DC converters in discontinuous conduction mode (DCM)is proposed in this paper. The models of three types DC—DC converters in DCM (Buck, Boost, Buck-Boost)is deduced. From these models, the DC analysis, small signal AC analysis and the calculations of parameters of normal model are performed. The computational results show a satisfactory agreement with those given by using the averaged state space method, so the method in this paper is better than the popular averaged state space method, its concepts are clear, computations are more simpler.