Sliding mode-Δ modulation control of a "buck" converter

A proposed approach that sets sliding mode control of linear systems within a classical input-output control framework is here used for the input-output sliding mode stabilization of a "buck" DC-to-DC power converter. The approach evades state measurements and circumvents the explicit use of asymptotic state observers in the sliding surface synthesis. The proposed scheme is also robust with respect to unmatched state perturbation inputs. A connection between sliding modes and classical Δ-modulators and Δ-Σ-modulators is also brought to attention as a tool for the realization of sliding mode control schemes in systems commanded by a switch position where a desirable average feedback controller design needs to be implemented.