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Title:
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Analysis of limit cycles in a PI digitally controlled buck converter
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Author:
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Bradley, D.; Alarcón Cot, Eduardo José; Feely, Orla
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Other authors:
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. EPIC - Energy Processing and Integrated Circuits |
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Abstract:
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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. |
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Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria electrònica::Electrònica de potència::Convertidors de corrent elèctric
-Electric current converters
-Buck converters
-Controller gain
-Digital control
-Duty cycles
-Feed-back loop
-Gain parameter
-Limit cycle
-Limit Cycle Oscillation (LCO)
-Proportional integral controllers
-Convertidors de corrent elèctric |
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Rights:
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Document type:
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Article - Published version
Conference Object |
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