| 摘要 |
PROBLEM TO BE SOLVED: To reduce a ripple current when a step-up ratio (transformation ratio) is increased while preventing an increase in the number of elements required for a circuit configuration.SOLUTION: A first DC power conversion circuit 11 increases the potential difference between a positive electrode potential of a load 13 and a positive electrode potential of a power supply BT by step-up operation, and a second DC power conversion circuit 12 increases the potential difference between a negative electrode potential of the load 13 and a negative electrode potential of the power supply BT by step-up operation. A control device 15 controls switching operation of first and second switching elements SW1 and SW2 of the first DC conversion circuit 11 by a first duty. The control device 15 controls switching operation of third and fourth switching elements SW3 and SW4 of the second DC power conversion circuit 12 by a second duty. The control device 15 controls a load voltage V0 to an optional voltage larger than or equal to a power-supply voltage VB. |
