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In this work, the suitability of three dc-dc converters for application in a PEM fuel cell system is examined. Investigation of boost converter, interleaved boost converter and interleaved boost converter with switch capacitors takes place. The efficiency of each converter at different load values is compared and the harmonic content that each of them produces is examined. Two different scenarios are presented. In the first one the system was designed to generate a converter output voltage of 50 V and in the second the output voltage is 100 V.