State and Disturbance Observer based Current Sensor-less Control of Mismatched Buck Converter

In this paper, the current sensorless control technique is proposed to control the mismatched dc-dc buck converter output voltage subject to external disturbances and system parameter uncertainties. The control technique is based on the combination of state and disturbance observers and the proposed terminal sliding mode controller. The primary objective is to control the converter output voltage in the presence of variations in load resistance, input supply voltage, and system parameters using a minimum number of sensors. The stability analysis of the proposed controller is performed together with state and disturbance estimations. The rigorous simulation experiments are performed to conclude that the proposed controller performs better than the existing controllers in terms of the transient and steady-state responses.