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Robust stability analysis for current-programmed regulators

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3 Author(s)
J. Leyva-Ramos ; Instituto Potosino de Investigacion Cientifica y Tecnologica, San Luis Potosi, Mexico ; J. A. Morales-Saldana ; M. Martinez-Cruz

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 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+δC). 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 analysis, which require a model structure consisting of a nominal model and a norm-bounded modeling uncertainty. Therefore, robust stability analysis can be realized using standard μ-tools. At the end of the paper, an illustrative example is given which shows the simplicity of the procedure.

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IEEE Transactions on Industrial Electronics  (Volume:49 ,  Issue: 5 )