新建他激反激变换器方程及其解析解

Newly Established Equation of Flyback Converter(FRE. Given) and Its Analytical Solution

引用文 [1 ]的思路 ,寻找他激反激变换器的运行状态特征参量 (磁通密度增量、剩余磁通密度和占空比 )与构成这一变换器的基本物理参量之间的函数关系。首先阐明由于频率给定 ,他激反激变换器稳态运行时会出现无剩磁工况和有剩磁工况两种。而后确定这两种工况下 ,磁路等效储能空间单位体积每个周期的传输能量 (命名为“磁能传输密度”)。在这基础上 ,分别建立和解出他激反激变换器在不同工况下稳定运行时应满足的方程。最后根据所得的解析解阐明这种变换器的特性。本文和文 [1 ],以磁路分析为基础建立了一种新的反激变换器理论。

The idea developted in ref is used to find the functional relations between the characteristic parameters (increment of magnetic flux desity, residual magnetic flux density and duty factor) in the stable operating state of the flyback converter (operating frequecy given) and its fundmental parameters used in constructing the converter. First of all, we describe both stable states (without residual magnetization and with residual magnetization) existed in operation of the converter because of its operating frequency given, and then we find the transfer energy per unit volume of the equivalent storage space of magnetical circuit for a period (named 'transfer density of magnetic circuit'). According to the result, the flyback converter equations for the both states satified in the stable operating state are established and solved. Finally, we discuss the properties of the flyback converter based on the gotten analytical solutions. A new theory of flyback converter based on magnetical circuit analysis has been established in this paper and .