| 摘要 |
PROBLEM TO BE SOLVED: To surely maintain power supply even when a fault occurs in a converter which obtains single-phase AC.SOLUTION: An uninterruptible power supply device comprises: a converter 12 for converting three-phase AC power to DC power; a storage battery 15 for storing the DC power outputted by the converter 12; an inverter 13 for converting the DC power outputted by the storage battery 15 to three-phase AC power; a first Scott transformer 16 for converting the three-phase AC power outputted by the inverter 13 to two-phase AC power; a second Scott transformer 19 for converting three-phase AC power for bypass use to two-phase AC power; a first uninterruptible switching circuit 17 for selectively switching the first single-phase AC power outputted by the first or the second Scott transformer 16, 19 and outputting the selected AC power; and a second uninterruptible switching circuit 18 for selectively switching the second single-phase AC power outputted by the first or the second Scott transformer 16, 19 and outputting the selected AC power. |
