准谐振反激变换器问题的解析解及其几何特征

本文从直接分析磁能储送的观点1,2 ] 出发 ,将准谐振反激变换器3] 和自激反激变换器各自的状态变量B(t) ,以同一导通起点放在一起 ,将它作为一个几何问题讨论 ,发现其中存在一重要的几何特征 ,很易获得这两种变换器磁路状态特征参量 (磁通密度、运行周期和占空比 )之间的解析关系。利用这些关系 ,一个准谐振反激变换器的设计问题就可以转化为一个自激反激变换器的设计问题 ;再引用文 1]的解析结果即可确定磁能储送器的基本物理参量

Analytical Solution of the Problem of Quasi-Resonant Flyback Converter and Its Geometrical Characteristics

In this paper, the viewpoint of straight analysis of magnetic energy storage-delivery 1,2] has been used to find the analytical relationships between the state characteristic parameters (magnetic flux density, operating period and duty factor) in magnetic circuits of quasi-resonant flyback converter and of self-oscillating flyback converter. By means of the geometrical analysis in which both of the state variables B(t) in the magnetic circuits of the two converters are put together, and the starting points (B(0)=0) of the two converters are set to be at a same point, we discover a very important characteristic in the composite figure and get the required analytical relationships easly. Using the results, a design problem of quasi-resonant flyback converter can be converted to design a self-oscillating flyback converter, and then the fundmental physical parameters of the magnetic energy storge-deliverer in the converter can be determinated according to the analytical results of paper 1].