Instabilities of the Buck DC-DC Converter under PI Control

G. Papafotiou and N. Margaris (Greece)


dc-dc converters, subharmonic oscillations, PI control


In this paper, the instabilities of a buck dc-dc converter under PI control are investigated. The study uses a discrete time description for the closed loop system, by forming a non-linear difference equation with respect to the duty cycle. This results to a thorough examination of the system's behavior and allows drawing conclusions about the limits imposed on the controller parameters.

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