On the generalized-proportional-integral multi-level sigma-delta sliding mode control of a buck-based inverter

This article considers the output feedback controller design for a multi-level dc-to-dc buck power converter structure. This converter is used as an inverter in an arbitrary bounded output voltage reference signal trajectory tracking task. The multi-level output feedback controller design is accomplished via a suitable combination of the Generalized-Proportional-Integral (GPI) feedback controller design technique along with a multi-level generalization of the sliding mode-based Sigma-Delta (Σ - Δ) modulator. Simulations and physical implementation on a five Level Σ - Δ modulator, as well as the buck multi-level inverter prototype, depict the performance of the proposed output feedback controller scheme.