| 摘要 |
The invention provides a power conversion device, nonuniform current distribution is generated in a parallel structure, and the power conversion device can reduce the nonuniformity of current distribution as soon as possible. The power conversion device is provided with a switching circuit used for switching between DC and AC, the switching circuit is connected in parallel with a plurality of semiconductor modules in a phase, and each semiconductor module is provided with an upper MOSFET and a lower MOSFET. The power conversion device comprises a current detection part used for detecting the AC side current of each semiconductor module; and a grid control part used for controlling the breakover and the disconnection of MOSFETs in dependence on the current detected by the current detection part, during the period, in a circulation current manner, when the circulation current flows through any one of the MOSFETs, the grid control part controls the breakover time of one MOSFET, at the circulation manner side, of one semiconductor module the current through which is detected by the current detection part to be lower to be longer than the breakover time of one MOSFET, at the circulation manner side of one semiconductor module the current through which is detected by the current detection part to be higher. |
