Patent ID: 9564827
Date: 2017-02-07
CPC Classifications: H02M

Claim:
1. A power conversion device which is connected between an AC circuit for plural phases and a DC circuit and performs power conversion between the AC circuit and the DC circuit, the power conversion device comprising: a first arm and a second arm provided for each phase and having one ends connected in series to each other, wherein the first arm and the second arm are each composed of one or a plurality of unit cells connected in series to each other, each unit cell being composed of: a series unit including a plurality of semiconductor switches connected in series to each other; and a DC capacitor connected in parallel to the series unit, a terminal of the semiconductor switch serving as an output end of the unit cell, a connection point between the first arm and the second arm for each phase is connected to a corresponding phase of the AC circuit, another one end of the first arm for each phase is connected to a positive side of the DC circuit, and another one end of the second arm for each phase is connected to a negative side of the DC circuit, the power conversion device further comprising: the power conversion device thereby suppressing variation in voltages of the DC capacitors among the phases.