Based on a set of discrete small signal model, under various schemes of work for a converter continuous-continuous, a fuzzy rule base is responsible, under this proposal, to make the generalization of the dynamic description of this system for any point work. To obtain a representative set of systems of optimum size, a selection methodology. This generalized model allows a proposal to control these systems from the selection of the fuzzy inference gain optimal realizmentación based on the corresponding set of local control laws. Obtained for the closed loop, there is a sufficient condition for stability. A study has been made in implementing this proposal on the converted Buck topology, comparing the results of various tests with those obtained with other regulatory schemes, such as current mode control, with significant improvements in performance obtained with the proposed controller .