| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an uninterruptible supply unit capable of realizing high reliability by performing dynamic soundness inspection for a power converter, maintenance bypass circuit or a bypass circuit. <P>SOLUTION: An output switch 30 supplies power to a load 4 from the power converter 8 constituted of a converter 10 and an inverter 11, and the switch is kept in an open state. The output sides of the power converter 8 and a maintenance bypass circuit 24 or a bypass circuit 20 are electrically connected with each other for parallel operation of them, thus inspecting soundness by a current value from an output voltage difference between them. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
