Sensor-less active uncertainty attenuation control for DC–DC buck power converters with the presence of involved parameter variations

Abstract

This paper explores the semi-global active uncertainty attenuation control problem for the DC–DC buck power converters. Taking consideration that the involved components may be subject to uncertainties and unknown time variation, a robust control result has been developed by utilizing a sensor-less control method via an output feedback domination technique and a generalized extended state observer. Explicit stability analysis shows the theoretical justification of the proposed design procedure. Numerical simulation results are presented to show that with different application requirements, the proposed control algorithm could perform with strong robustness against internal parameter uncertainties and has a nice disturbance rejection ability against internal/external disturbances. Moreover, the proposed control scheme consists of a set of linear equations with more flexibility of the gain selections but without losing its high-precision voltage-tracking performance, hence it will provide the engineers with convenient and easy implementations.