| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an uninterruptible power supply device that can surely, quickly and selectively be disconnected when a fault occurs, by eliminating the transition of a signal line between the uninterruptible power supply devices that are operated in parallel. <P>SOLUTION: This uninterruptible power supply device comprises a first detection means (A/D converter 10j) that detects output voltage V<SB>o</SB>applied to a load apparatus from this uninterruptible power supply device, and the other uninterruptible power supply devices that are connected to this device in parallel; a second detection means (A/D converter 10h) that detects an output voltage V<SB>i</SB>of this device; a first delay means (delay block 100) that delays the output voltage V<SB>o</SB>by a prescribed amount; a second delay means (delay block 101) that delays the output voltage V<SB>i</SB>by a prescribed amount; and a determination means (control circuit 10e) that determines whether or not this device is broken down by performing a prescribed operation among the output voltage V<SB>o</SB>, an output voltage V<SB>od</SB>from the first delay means, the output voltage V<SB>i</SB>, and an output voltage V<SB>id</SB>from the second delay means. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
