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Abstract The method of Extended Linearization is proposed for the systematic solution of sliding mode controller design in DC-to-DC Power Converters of the Boost and the Buck-Boost type. A nonlinear sliding surface with suitable properties is synthesized on the basis of the extension of a linear design carried out on the average incremental model of the converter. The obtained feedback strategies lead to asymptotically stable Sliding Modes with remarkable self-scheduling properties. Simulation examples are■ presented for illustrative purposes.