A number of new and renewable energy power plants have currently been under construction to cope with fossil fuel depletion, while various large-scale battery energy storage systems have been configured to complement the characteristically unstable output of new and renewable energy. In the meantime, as the scale of energy storage system increases, there is an urgent demand for bidirectional charge/discharge converters with large capacities, and relevant researches are actively going on. Interleaved converter is most generally used for this purpose because it enables not only the reduction of output current ripple, but also the increase of capacity through the parallel configuration of inductor and switch and diode. This paper proposes a new co송성근ncept of DC/DC converter that allows the sharing of inductor and output capacitor by using a multi-phase switch. However, interleaved converter has the weak points that size and unit price increase as capacity increases, and that effective switching frequency is limited. The proposed DC/DC converter has a structure that can increase the effective switching frequency of not only output capacitor but inductor as well, and its merit of enabling the reduction of inductor capacity by reducing inductor current ripple was demonstrated.