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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.
CitationBradley, D.; Alarcon, E.; Feely, O. Analysis of limit cycles in a PI digitally controlled buck converter. A: IEEE International Symposium on Circuits and Systems. "ISCAS 2012: IEEE International Symposium on Circuits and Systems, May 20-23, 2012, Seoul, Korea". Seoul: 2012, p. 628-631.
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