The FCBC requires only a small input inductor in order to suppress the inrush current from a power supply to a flying capacitor [1-4,7]. In addition, one important feature of the FCBC is that the boost-up energy is transferred from the flying capacitor to the output side, which means that the input inductor can be designed with a small inductance and a reduced core volume of the inductor[2,4]. Consequently, the overall size and weight of the input inductor can be greatly reduced as compared to a conventional two-level DC/DC boost converter [1,2,5,7].