输入滤波器与开关变换器相互作用的分析

Analysis of Interactions between Input Filter and Switching Converter

分析了输入滤波器与变换器之间的相互作用问题。指出由于输入滤波器与变换器之间不利的相互作用,使系统动态性能变差甚至不稳定。从实验的角度对阻抗比判据进行了验证,结果表明,阻抗比判据是研究子系统相互作用问题的简单方法,但过于保守,限制了输入滤波器参数的选取范围。最后给出了输入滤波器简单实用的设计方法,该方法既避免了输入滤波器与变换器之间的相互作用问题,同时也很好地满足了滤波的要求。

This thesis analyzes interactions between input filter and switching converter experimentally and theoretically,and points out that additional input filter can adversely interact on the converter,and results in a severe dynamic performance degradation of the system or even instability.The impedance ratio criterion is tested by experiment,and the results shown that it is a simple way to research subsystem interactions,but it is conservative and restricts the optional range of the input filter parameters.Simple and practical design procedures are presented finally.The procedures offer an input filter which avoids interactions between input filter and converter, while the filter specifications can be satisfied also.