| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an uninterruptible power supply apparatus capable of accurately switching from an inverter power feeding state to a bypass power feeding state.SOLUTION: An uninterruptible power supply apparatus 1 includes a switch control circuit 26 for, when switching from an inverter power feeding state to a bypass power feeding state, sequentially turning on a thyristor switch 14 and a contactor 15, and a switch control circuit 32 for turning on the contactor 15 when a current flows in the thyristor switch 14. Accordingly, even when the switch control circuit 26 does not accurately operate due to the failure of a power supply circuit 27, the switch control circuit 32 can turn on the contactor 15 to accurately switch from the inverter power feeding state to the bypass power feeding state.</p> |
