Reference Signal Limiter in the Control of Buck Power Converters with Improved Stability

Authors: Prasanth Sai, M. Narendra Kumar, S. Sunisith

Abstract

This paper presents the solution for controlling the dc-dc switched power of Buck type converter. This technique states that the control signal can take the values in the range (0, 1) only. Such a control limitation is generally not considered into account when designing the converter regulators. This is only dealt with in the control implementation stage, placing a limiter (controls the range of input signal) between the controller and the controlled system. In this, the control signal limitation is provided by using a non-linear regulator that consists of an internal limiter. The final closed-loop control system is nothing but the non-linear feedback involving a linear dynamics block in closed-loop with a non-linear static element. If these conditions are satisfied when choosing the control design parameters then the regulator improves closed-loop stability and output reference tracking.

Index Terms

Buck Converters, Reference Signal Limiter, Switched Power Converter.

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Reference Signal Limiter in the Control of Buck Power Converters with Improved Stability