| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an uninterruptible power supply system, which includes two systems of power supplies made of two sets of uninterruptible power supplies and a cross board for selecting a power system of either system between these two systems and feeding power to a load, thereby improving reliability on feeding. <P>SOLUTION: The system synchronizes the output voltage of an uninterruptible power supply in the second system with the output voltage of a bypass power supply in the second system by each of synchronism selecting circuits 150 installed severally in uninterruptible power supply circuits 40 and 50, and also synchronizes the output voltage of an uninterruptible power supply in the first system with the output voltage of a bypass power supply in the first system by each of synchronism selecting circuits 150 installed in uninterruptible power supply circuits 10 and 20, when AC power supplies 1 and 4 are each in sound states and the uninterruptible power supply circuits 10 and 20 are in parallel operation via closed contactors 31 and 32 in a bus panel 30, and likewise the uninterruptible power supply circuits 40 and 50 are in parallel operation via closed contactors 61 and 62 in a bus panel 60, and for example, the uninterruptible power supply in the second system is set to the master in the synchronous state of this uninterruptible power supply system, as a usual state of this uninterruptible power supply system. <P>COPYRIGHT: (C)2010,JPO&INPIT |
