Abstract—This paper discusses the principle and electrical characteristics of the fuel cell, designs an innovative hybrid power system, and proposes a new dc–dc converter scheme to combine thefuelcellwiththestoragesystem.Aneffectiveconverterscheme forthefuelcellisobtainedbyanalyzingthe highefficient topology as well as the phase shifted pulse-width modulation. Through comparing several different control modes of converters, a 75-kW prototype system is constructed, moreover, which steady-state operating characteristics are illustrated and discussed in detail. At last, experimental results are also shown to verify the proposed scheme