Output Voltage Regulation For dc–dc Buck Converters: a Passivity–Based PI Design

Abstract

This paper presents a global tracking passivity–based proportional–integral (PI) control for output voltage regulation of a dc–dc Buck converter. The proposed controller is based on passivity formulation since dc–dc Buck converter has a passive structure in open–loop. Additionally, the controller takes advantage of the PI actions to design a control law that guarantees asymptotically stability in the Lyapunov’s sense under closed–loop operation. The proposed controller does not depend on the parameters, which makes it a robust controller. The robustness of the proposed controller is checked by comparing its dynamical performance in front of a conventional PID controller. All simulation results were fulfilled via MATLAB software.