<p>A new negative output boost DC–DC converter with a wide voltage gain range is proposed in this paper. On the input voltage side, two boost structures are connected in parallel, and the input current is split through two inductors, thereby reducing the volume of the inductors and improving the efficiency of the converter. When charging inductors, a higher charging voltage is constructed to increase the voltage gain of the converter. On the output voltage side, capacitors are discharged in series to further increase the voltage gain of the converter and reduce the voltage stress of the power semiconductors. The operating principle, characteristics, and parameter design of the proposed converter are presented. In addition, a comparison with other converters is given and analyzed. A 400 W prototype is developed to verify the correctness of the theoretical analysis, and it is shown to be suitable for use as a power interface for fuel cell vehicles.</p>