Patent Number: 8,817,503

Title: Power converter with a central controller and cell controllers daisy-chained by optical fiber

Abstract: Disclosed is a power conversion device, wherein among the optical fiber cables used in control/communication, at least the majority of high-voltage optical fiber cables with a dielectric strength against the output voltages of a plurality of cells can be eliminated and thus a low-voltage optical fiber cable with a dielectric strength against the output voltage of one cell can be used. Furthermore, here, the length required for the optical fiber cable can be reduced. A controller of the power conversion device comprising a plurality of cascade-connected cells comprises a central controller, and a cell controller with the same potential as each cell, the cell controller being installed in the vicinity of each cell, wherein the central controller and each cell controller are daisy-chained using an optical fiber cable.

Inventors: Inoue; Shigenori (Hitachi, JP), Katoh; Shuji (Hitachiota, JP), Kato; Tetsuya (Hitachiota, JP)

Assignee: Hitachi, Ltd.

International Classification: H02M 7/25 (20060101)

Expiration Date: 8/26/12018