Extended state observer‐based sliding mode control for PWM‐based DC–DC buck power converter systems with mismatched disturbances

This study investigates an extended state observer (ESO)‐based sliding mode control (SMC) approach for pulse‐width modulation‐based DC–DC buck converter systems subject to mismatched disturbances. By designing a novel sliding‐mode manifold incorporated with a disturbance estimation technique, an ESO‐based SMC method is designed to deal with mismatched disturbances. A rigorous stability analysis is also presented. As compared with the nominal SMC method, the proposed method obtains a better disturbance rejection ability even the disturbances do not satisfy the so‐called matching condition. Simulations and experimental comparison results are implemented to verify the effectiveness of the proposed control method.