| 摘要 |
PROBLEM TO BE SOLVED: To obtain a unit type uninterruptive power supply having excellent general versatility. SOLUTION: Only one pair of storage batteries 15 is employed so as to convert the three-phase alternating current electric power from the three-phase alternating current power supply into the uninterruptible three-phase alternating current output, wherein 2n power supply units 10 having a couple of input terminals 101 and 102, and a couple of output terminals 103 and 104 are used for configuration, the device is divided into the first power supply block 1001 comprising n power supply units obtaining U-phase and V-phase power from the R-S interphase power and the second power supply block 1002 comprising n power supply units obtaining V-phase and W-phase power from the S-T interphase power, a potential of an input terminal 102 in which S-phase power is input and a potential of an output terminal 104 in which V-phase power is output are made common, a storage battery 15 is connected to the common potential wire, and a series connection circuit made up of the first capacitor and the second capacitor, a choke coil having the first winding 1 and the second winding 2, and a switching element are provided. |
