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通过小信号环路估计DC-DC开关变换器的大信号稳定区域预测

, PP. 63-69

Keywords: 开关变换器,环路增益,稳定区域,大信号稳定,Boost变换器

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Abstract:

基于经典线性频域理论可设计DC-DC开关变换器的相对稳定性,系统在小信号扰动下的工作特性得以简便地预测与校正。由于环路增益设计通常留有足够的稳态裕量,因此闭环控制系统也可达到一定范围内的大信号稳定。本文以平均电流控制Boost变换器为典型研究对象,通过建立Boost变换器的控制模型分析其大信号稳定性。借助范数不等式推导出Boost变换器的充分稳定条件,以此估计出系统的稳定区域,并揭示小信号环路增益对大信号稳定区域的影响。最后,通过搭建实验样机验证了该思路的正确性。

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