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This research paper focuses especially the design and simulation of dc-dc converters. It contains the theoretical derivations and parameters equations with design and examples. Simulation results for buck, boost and buck-boost converters are shown with the chance of different input parameters. In this work we have analyzed the equation of a buck, boost and buckboost converters and proposed the design components and simulation of these converters. Changing the input parameters like inductance, capacitance and switching frequency in order to observe the changes in output voltage has been added with simulation graph. These parameters and their equations should be well understood before designing buck or boost or buckboost converters. Simulation procedures in Orcad are also added in this paper. We have achieved performance parameter equations for these three regulators. It was completed the design and investigation of these three converters through mathematical examples and have generated the circuits for simulating buck, boost and buck boost converters. And also have attained different output voltage curve with the change of input parameters. The output graphs for all the converters are well fitted.