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In this paper, several different control methods based on intelligent system on DC-DC converter are compared with together. These DC-DC converters are used for the stabilization or the control of DC voltage of a battery. Lately, improvement the performance of the step-down converter is one of the goals of the engineers in the industries. In this paper controlled step-down converter using new several fuzzy logic controls law algorithms and PID controllers based on genetic algorithm (GA) and particle swarm optimization (PSO) are studied. These controllers are designed to eliminate the overshoot and reduce the settling time response. All the analysis and simulations to duplicate on the above converter by MATLAB software were performed and confirm the capability of the control methods in the improvement of the above-mentioned converter functioning.