| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a switching method of an uninterruptible power supply device capable of preventing an excitation rush current at power recovery switching. <P>SOLUTION: An uninterruptible power supply device has a switch 14 for switching between commercial power feeding for outputting a power from a commercial AC power supply 2 to a commercial transformer 3 that is a load and inverter power feeding for outputting a power from an accumulator battery 12 to the commercial transformer 3 via an inverter 13. When the commercial AC power supply 2 returns to a normal condition from an abnormal condition, a phase of an output voltage of the inverter 13 is advanced to a phase of a commercial input voltage of the commercial AC power supply 2 by a switching time period of the switch 14, and then, the switch 14 is switched from the inverter power feeding to the commercial power feeding. <P>COPYRIGHT: (C)2013,JPO&INPIT |
