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Please replcae the abstract with the following text:In this paper, a new isolated high step-down dc-dc topology based on buck converter is proposed. This structure reduces the amplitude of the voltage on the primary side of the transformer (which is an ideal type), which reduces the turn-ratio and leakage impedance. The recommended structure uses active clamped strategies to return the energy of leakage impedance and to repress voltage spikes. Under this condition, the overall efficiency of the converter can be enhanced impressively. The benefits of the proposed structure are simple structure, a simple control system that needs only two signals with a 180O phase shift, reduced power circuit components, the lower standing voltage of the semiconductor components in the high-voltage side, and a high conversion ratio. The proposed converter can be applied in low voltage (5V) applications with high input current such as computer applications. The operation modes of the recommended converter, designing of utilized circuit elements, steady condition analysis, and finally some experimental results of the built prototype of the recommended structure have been provided completely. The overall efficiency of the proposed topology at 250W is equal to 92%. Also, the amplitudes of input and output voltage are 380 V and 5 V, respectively.

An improved isolated DC–DC Buck converter with high step-down ratio