DC-DC CONVERTER CIRCUIT

There is provided a DC-DC converter circuit with which a rapid mode switching process can be achieved, conduction loss between switching elements is lower than in the conventional art, which affords an increase in power conversion efficiency. A DC-DC converter circuit 10A includes first to sixth semiconductor switches S1 to S6 and an inductor L. The first to third semiconductor switches S1 to S3 are connected to one end of the inductor L. The fourth to sixth semiconductor switches S4 to S6 are connected to the other end of the inductor L. A first voltage supply E1 is connected to opposite ends of the first and fourth semiconductor switches S1 and S4 from the ends of the first and fourth semiconductor switches S1 and S4 connected to the inductor. A second voltage supply E2 is connected to opposite ends of the second and fifth semiconductor switches S2 and S5 from the ends of the second and fifth semiconductor switches S2 and S5 connected to the inductor. The first voltage supply E1 and the second voltage supply E2 are both connected to opposite ends of the third and sixth semiconductor switches S3 and S6 from the ends of the third and sixth semiconductor switches S3 and S6 connected to the inductor.