DESIGN AND ANALYSIS OF LUENBERGER OBSERVER WITH AGGRESSIVE POLE PLACEMENT FOR BUCK CONVERTER

Abstract

This study presents the design and analysis of a Luenberger observer with aggressively placed poles for a buck DC–DC converter. The objective is to estimate the inductor current and output voltage using only the measured output voltage, thereby enabling state feedback control in systems where current sensing is impractical or costly. A state-space model of the converter is derived, and the observer poles are placed sufficiently far in the left-half plane to ensure rapid estimation-error decay while maintaining numerical robustness. To validate the performance of the observer, MATLAB simulations are conducted under both nominal conditions and step changes in load and input voltage. Even when faced with abrupt disturbances, the results demonstrate that the proposed observer accurately reconstructs the unmeasured state variables with minimal delay, highlighting its robust performance. This makes the proposed observer a promising approach for advanced control schemes where full state feedback is essential.