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DC-DC conversion techniques have developed very quickly and are undergoing dramatic changes as a result of two major trends in the electronic industry: low voltage and high power density. Negative output Luo re-lift converter is a new type of DC-DC step-up converter, which provides negative output voltage for positive input voltage using voltage lift technique. Luo converter is highly non-linear and time variant and shows complex behavior patterns as it works in switch mode. Conventional control approaches cannot provide good dynamic performance for the above chosen converter. As it is inherently robust and model-free, fuzzy logic controller is used in the present work. The derivation of fuzzy control algorithm for regulating the output of the chosen converter is described in this paper. The proposed fuzzy control is evaluated by computer simulation as well as experimental measurements of the closed-loop performance of the negative output Luo re-lift converter under line and load disturbances. The controller is found to provide satisfactory performance under these conditions.