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Uncertainty models for switch-mode DC-DC converters

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2 Author(s)
Leyva-Ramos, J. ; Dept. of Electr. & Comput. Eng., Rice Univ., Houston, TX, USA ; Morales-Saldana, J.A.

Uncertainty models for the three basic switch-mode converters, buck, boost, and buck-boost, are given in this paper. The resulting models are represented by linear fractional transformations (LFTs) with structured dynamic uncertainties. Uncertainties are assumed for the load resistance R=Ro(1+δR), inductance L=Lo (1+δL), and capacitance C=Co(1+δ C), The interest in these models is clearly motivated by the need to have models for switch-mode DC-DC converters that are compatible with robust control design, which require a model structure consisting of a nominal model, and a norm-bounded modeling uncertainty. Therefore, a robust controller design under parameter uncertainties can be obtained instead of the deterministic approach widely used

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Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on  (Volume:47 ,  Issue: 2 )