Patent ID: 8736239

Claim:
A DC-DC converter circuit, comprising: a first switching element including a first semiconductor switch with which current can be controlled on and off in one direction, and a first diode connected in parallel to the first semiconductor switch so that the first diode allows current to flow in the opposite direction from the direction of on and off control by the first semiconductor switch; a second switching element including a second semiconductor switch with which current can be controlled on and off in one direction, and a second diode connected in parallel to the second semiconductor switch so that the second diode allows current to flow in the opposite direction from the direction of on and off control by the second semiconductor switch; an inductor connected at one end to the cathode side of the first diode included in the first switching element, and connected at the other end to the cathode side of the second diode included in the second switching element; a third switching element provided so that current can flow in one direction from an anode side of the first diode included in the first switching element to an anode side of the second diode included in the second switching element; and a fourth switching element provided so that current can flow in one direction from the anode side of the second diode included in the second switching element to the anode side of the first diode included in the first switching element, wherein a first voltage supply is connected between the cathode side of the first diode included in the first switching element and the anode side of the second diode included in the second switching element so that the first switching element side of the first voltage supply becomes a positive pole, an anode of the first voltage supply being connected to an input side of the fourth switching element, and a second voltage supply is connected between the anode side of the first diode included in the first switching element and the cathode side of the second diode included in the second switching element so that the second switching element side of the second voltage supply becomes a positive pole, an anode of the second voltage supply being connected to an input side of the third switching element.