PROBLEM TO BE SOLVED: To reduce the scale of a circuit, and to achieve a high conversion efficiency, even if a necessary boosting ratio is high.;SOLUTION: When boosting operation is performed, current flows by the route of DC power source 1, to winding 10a of a reactor 10, to MOSFET 3, and to DC source 1 when the MOSFET 3 is in an on-state; and by the route of DC source 1, to winding 10a, to diode 6, to winding 10b, to diode 8, to capacitor 12, to capacitor 13, and to DC source 1 when the MOSFET 3 is in an off- state, and the capacitors 12, 13 are charged, and voltage is increased. When deboosting operation is performed, current flows by the route of DC power source 16, to MOSFET 4, to winding 10b, to diode 18, and to DC power source 16 when the MOSFET 4 is in an on-state, and by the route of winding 10a, to capacitor 21, to diode 7, and to winding 10a when the MOSFET 4 is in an off-state, and a capacitor 21 is charged. On/off operations of the MOSFET 3 or MOSFET 4 are repeated by a constant ratio.;COPYRIGHT: (C)2002,JPO
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