| 摘要 |
A converter section (2) includes three pairs of switching elements (Srp, ..., Stn), each pair having two switching elements connected in series between two direct current links (L1, L2), and phases of an input three-phase alternating current are connected to nodes between the series-connected switching elements one by one. Each of the switching elements (Srp, ... , Stn) is made of a transistor having a bipolar structure. The control unit (5) controls the switching elements (Srp, ..., Stn) such that line voltages between a reference phase, which is one of the phases of the input three-phase alternating current, and each of the other phases are output to the two direct current links (L1, L2) on a time division basis. The control unit (5) applies a predetermined gate voltage to one or more of the switching elements (Srp, ... , Stn) to which a reverse bias is applied. |
