A Uniform Nonlinear Control Method for DC-DC Converters with Fast Transient Response

Wang Huai, Henry S.H. Chung

    Research output: Contribution to journalArticlepeer-review

    1 Scopus citations


    Much effort has been made to the switching surface control of buck converter. However, it remains a fundamental challenge to apply the same concepts and associated control techniques to converters with non-minimum-phase characteristics. A nonlinear control method for all basic DC-DC converters (ie buck converter, boost converter, buck-boost converter, C’ uk converter and SEPIC) is proposed by deriving a uniform switching surface. It retains the advantages of boundary control for buck converter with second-order switching surface. For example, the converters can reach steady state in two switching actions after being subjected to large-signal disturbances. The derivations are general-oriented and can determine the circuit variables needed in the switching function. The same controller is universally applicable to different converters operating in both continuous conduction and discontinuous conduction modes. The potential applications lie in power conversions which require fast response to line/load changes, such as the point of load (POL) converters in the distributed power conversion system, power conditioning stage of the conversion system supplied by renewable energy sources, and so on. Design procedures and performance of the proposed control method applied on a 190 W 48/48 V buck-boost converter prototype will presented and compared with theoretical predictions.

    Original languageBritish English
    Pages (from-to)31-39
    Number of pages9
    JournalHKIE Transactions Hong Kong Institution of Engineers
    Issue number4
    StatePublished - 2010


    • Boundary Control
    • Second-order Switching Surface
    • Sliding Mode Control
    • State Trajectory Control
    • Switching Surface Control


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