Patent ID: 8711586

Claim:
A power converter provided with a plurality of arms which are each comprised of a plurality of converter cells and having a plural phase construction, wherein each phrase corresponds to an arm configured by connecting the plurality of converter cell in series, comprising a controller configured to: conduct interrupt processing of carrier waves of the converter cells to synchronize control of corresponding converter cells of the different arms, wherein each carrier wave is shifted by a predetermined shift value at each arm such that each phase is different from each other, and wherein each converter cell is driven, at each converter cell, by comparing a common instructed value per each arm and the carrier wave; operate frequencies of the carrier waves of the converter cells in a state larger than a value which is obtained by dividing a maximum frequency of a human audible frequency band by the number of the converter cells in the arms; and shift the value of the carrier wave at any converter cell to the predetermined shift value when the shift value of the carrier wave at that converter cell is displaced from the predetermined shift valued.