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Hybrid posicast controller for a DC-DC buck converter

Author(s): Kaithamalai Udhayakumar | Ponnusamy Lakshmi | Kandasamy Boobal

Journal: Serbian Journal of Electrical Engineering
ISSN 1451-4869

Volume: 5;
Issue: 1;
Start page: 121;
Date: 2008;
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Keywords: DC-DC Buck converter | Posicast | PID controller

A new Posicast compensated hybrid controller for the DC-DC Buck converter is investigated. Posicast is a feed forward compensator, which eliminates the overshoot in the step response of a lightly damped system. However, the traditional method is sensitive to variations in natural frequency. The new method described here reduces this undesirable sensitivity by using Posicast within the feedback loop. Design of the Posicast function is independent of computational delay. The new controller results in a lower noise in the control signal, when compared to a conventional PID controller.
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