Oblon, McClelland, Maier & Neustadt, L.L.P.
Power conversion device
Each phase arm of a power conversion device includes at least one converter cell connected in series. For each converter cell, an element driving unit is provided which turns on one switching element in the converter cell as a startup element. The element driving unit is supplied with power from a DC capacitor, and when voltage of the DC capacitor exceeds startup voltage Vsh, turns on the startup element. Thus, at the time of startup of the power conversion device, the DC capacitor in each converter cell is initially charged to desired voltage.
Mitsubishi Electric Corporation
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Toshiyuki Ryota
Fujii Onishi