Power converters are vital part of many devices. Intelligent control for such a vital part is a high priority task. The paper describes about the implementation of standalone fuzzy logic controller and self-tuning fuzzy logic based PID controller in order to control a step down power converter. The software has been developed to simulate the real time situation based on the fuzzy logic technology. Simulation results of the fuzzy logic controller are shown for two intelligent control methods, a fuzzy logic control and self-tuning fuzzy PID reveal better performances than the PID conventional controller.