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Fuel cells are considered as one of the most prominent sources of green energy in future. However, the potential efficiency of fuel cell will be untapped unless an efficient method can be used to convert the fuel cell low voltage to high voltage grid or user load. Many topologies have been proposed for such applications. However, most of them consider the fuel cell as an voltage source instead of a current source. In this paper, an isolated current-fed full bridge boost converter is proposed as the front-end of the fuel cell system, which is more compatible with the fuel cell particularities. Small signal analysis is applied to the converter and current control method is used. Simulation and experiment results are shown to verify the analysis.