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Hybrid posicast controller for a DC-DC buck converter

Kaithamalai Udhayakumar (Department of Electrical and Electronics Engineering, College of Engineering Guindy, Anna University, Chennai, India)
Ponnusamy Lakshmi (Department of Electrical and Electronics Engineering, College of Engineering Guindy, Anna University, Chennai, India)
Kandasamy Boobal (Department of Electrical and Electronics Engineering, College of Engineering Guindy, Anna University, Chennai, India)

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.

Keywords: DC-DC Buck converter, Posicast, PID controller