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Batteries are an important component in terms of electricity. It is undeniable that the need for batteries is a primary need at this time. The greater the voltage needed, the more batteries needed to generate electricity. Ultra Step Up converter is a series of dc to dc that can increase the DC energy source. The Ultra Step Up converter has the advantage of being able to increase the voltage with a large enough gain so that the voltage output value is very large with a small input voltage. In this final project Ultra Step Up converter will be developed with constant voltage regulation using Fuzzy Logic Controller. The DC battery source is 48V as input from the converter which will produce an output voltage that exceeds the boost converter output voltage. The advantage of Ultra Step Up Converter is that it can increase the voltage higher than conventional converters such as Boost Converter, and has good efficiency. Based on the simulation results show that the output voltage has reached the expected value of 540V with the initial ripple not too high with a duty cycle of less than 50%. To keep the output voltage constant, the Sugeno type fuzzy logic controller is used.