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The purpose of the present paper is to analyze the input inductor design and to establish the relationship betweenthe capacitance of the flying capacitor and the output voltage ripple in order to reduce the size and weight of the flyingcapacitor DC-DC boost converter (FCBC). The inductance of the input inductor is designed by considering the maximuminput current ripple, and the experimental results are used to confirm that the input current ripple is within thedesigned value. Furthermore, according to the design specifications, the required inductance of an input inductor isapproximately 25% of that of a conventional two-level DC-DC boost converter, and the required inductor core volumeis approximately 35% of that of a conventional two-level DC-DC boost converter. Moreover, the capacitance of the flyingcapacitor and the output voltage ripple are confirmed to be independent of each other. Theoretically, this is becausethe time constant of the output capacitance and the output resistance of the FCBC is larger than the switching periodof the switching frequency. This finding is confirmed by the simulation and experimental results of the present study.On the basis of this finding, the capacitance of the flying capacitor can be estimated and designed without consideringthe output voltage ripple. Moreover, the achieved maximum efficiency of the designed FCBC is 98.5% of the outputpower at 1kW

Size Reduction of DC-DC Converter using Flying Capacitor Topology with Small Capacitance