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In this paper, a new isolated DC-DC boost converter based on three-state switching cell (3SSC) is proposed. The mentioned cell allows the use of only two windings in the isolation transformer, as well as, the series connection of only one DC current blocking capacitor to avoid its saturation. Other relevant characteristics of the converter are, the blocking voltage across the controlled switches is low, which allows the utilization of lower drain-to-source conduction resistances (RDSon) MOSFETs, and the current through the autotransformer winding is almost continuous minimizing the hysteresis losses on the magnetic core. In this way, the efficiency of the proposed converter is high, and it is recommended for the development of power supplies using low voltage sources commonly found on renewable energy conversion systems and batteries. The converter was analyzed in overlapping of the control signals or duty cycle higher than 0.5 operating in continuous conduction mode (CCM). In order to verify the feasibility of this topology; principle of operation, theoretical analysis, and experimental waveforms are shown for a lkW assembled prototype.