Design of practical sliding-mode controllers with constant switching frequency for power converters

Eva M. Navarro-López, Domingo Cortés, Christian Castro

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    A novel experimentally motivated method in order to design a family of easy-to-implement sliding-mode controllers for power converters is proposed. Two main results are presented. First, the relation between sliding-mode control and average control is reinterpreted so that the limitation of the switching frequency for the closed-loop system is achieved in a more direct way than other methods so far reported in the literature. For this purpose, a class of sliding surfaces which makes the associated equivalent control be the system average control is proposed. Second, the achievement of a constant switching frequency in the controlled system is assured without requiring the sliding-mode-based controller to be modified, unlike most previous works. As a result, the proposed sliding surfaces-type can be directly implemented via a pulse-width modulator. The control methodology is implemented for the voltage control in a boost converter prototype in which the load is considered unknown. Experimental results confirm high performance and robustness under parameters variation. Furthermore, the solution proposed is easy to implement and well-suited for other power converters. © 2008 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)796-802
    Number of pages6
    JournalElectric Power Systems Research
    Issue number5
    Publication statusPublished - May 2009


    • Discontinuous control
    • Nonlinear systems
    • Power converters
    • Pulse-width modulation
    • Sliding-mode control


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