Patent ID: 7729144

Claim:
A DC/DC power conversion device comprising: a plurality of smoothing capacitors; and n column circuits, n is an integer of 2 or more, sharing the plurality of smoothing capacitors to be connected in parallel, each column circuit comprising: a plurality of circuits formed by connecting in series inverter circuit(s) for driving and rectifier circuit(s), wherein each inverter circuit is formed by connecting in series a high voltage sided element and a low voltage sided element, each element is made of semiconductor switching element, and by connecting them between both terminals of the smoothing capacitor, and each rectifier circuit is formed by connecting in series a high voltage sided element and a low voltage sided element, each element is made of a semiconductor switching element or a diode element, and by connecting them between both terminals of the smoothing capacitor; and capacitors for energy transfer connected respectively between the circuits in such manner that each capacitor is connected between two middle terminals such as middle terminals corresponding to contact points of the high voltage sided elements and the low voltage sided elements in the respective circuits, wherein driving signals for the respective column circuits have the same driving cycle and are out of phase with each other.