小信号模型在电力电子变换器设计中的应用

Application of Small Signal Model in Power Electronic Converter Design

针对连续导通电流模式(CCM)与断续导通电流模式(DCM),介绍了占空比计算与小信号模型的建立方法。在CCM模式下,通过状态矩阵分析与泰勒级数展开,得到系统的小信号状态空间平均方程。在DCM模式下,采用开关网络平均法与泰勒级数展开,得到开关网络的平均模型与变换器的小信号模型系统。成功建立了电力电子变换器的占空比计算与小信号数学模型,为电力电子设计提供了有力的分析工具。

According to continuous conduction current mode(CCM)and interrupted conduction current mode(DCM),the study introduces the calculation of duty cycle and the establishment of small-signal mathematical model.In CCM mode,the small-signal state-space average equation of the system is obtained through state matrix analysis and Taylor series expansion.In DCM mode,the average model of the switching network and the small-signal model of the converter are obtained by using the switching network averaging method and small-signal mode system.This study has successfully established the duty cycle calculation and small-signal mathematical model of power electronic converters,so as to provide powerful analytical tools for power electronic design.