利用根轨迹技术设计降压和升压变换器的数字控制器

Liping Guo, John Y. Hung, R. Nelms
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引用次数: 84

摘要

本文讨论了根轨迹技术在降压和升压变换器数字控制器设计中的应用。首先利用匹配的极零映射方法将两种变换器的小信号模型转换为离散时间模型。基于离散时间模型,采用根轨迹法设计了数字控制器。通过选择数字控制器的极点、零点和增益,将闭环极点放置在z平面上所需的位置。然后在TI DSP上实现数字控制器。将根轨迹设计方法与频率响应设计方法进行了比较。降压变换器的实验结果表明,采用根轨迹法得到的结果与频率响应法得到的结果相当,而升压变换器的实验结果表明,升压变换器的小信号模型的非线性特性可能会降低采用根轨迹法设计的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Digital controller design for buck and boost converters using root locus techniques
Root locus techniques to design digital controllers for buck and boost converters are discussed in this paper. The small signal models of both converters are first transformed into discrete-time models using the matched pole-zero mapping method. Digital controllers are designed based on the discrete-time model using the root locus method. By selecting the poles, zeros and gain of the digital controllers, the closed-loop poles are placed at desired locations in the z-plane. The digital controllers are then implemented on a TI DSP. The root locus design method is compared with the frequency response design method. Experimental results from the buck converter indicate that the results obtained using the root locus method are comparable to the results obtained using the frequency response method, while results from the boost converter indicate the nonlinear nature of the boost converter small signal model may degrade the performance of the design using the root locus method.
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