Analysis of limit cycles in a PI digitally controlled buck converter
Analysis of limit cycles in a PI digitally controlled buck converter
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PI数控降压转换器的极限环分析
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
O. Feely
中科院分区：
文献类型：
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作者：
M. Bradley;E. Alarcón;O. Feely
近年来，电源变换器的数字控制一直是一个研究热点。在这些系统中出现的问题之一是由于反馈回路中的量化而产生的极限环振荡。本文研究了带有比例积分控制器的buck变换器的数字控制版本中出现的极限环振荡。研究了可能在两个占空比水平上发生的振荡的幅度和频率，并将其与控制器增益参数联系起来。分析表明，仅仅通过调整增益参数是不可能保证在两个电平上不发生极限环振荡的，并给出了一个防止两个电平上发生振荡的条件。
Digital control of power converters has been an area of considerable research interest in recent times. One of the problems which arises in these systems is that of the limit cycle oscillations that occur due to quantization in the feedback loop. This paper investigates the limit cycle oscillations that occur in the digitally controlled version of the buck converter with a proportional-integral controller. The amplitude and frequency of the oscillations that may occur on two duty cycle levels are investigated and related to the controller gain parameters. The analysis shows that it is not possible to guarantee that limit cycle oscillations on two levels will not occur simply by adjusting the gain parameters, and yields a condition which will prevent oscillations on two levels from occurring.