| 摘要 |
APPARATUS FOR PARALLEL OPERATION OF TRIPORT UNINTERRUPTABLE POWER SOURCE DEVICES In an apparatus for parallel operation of plural uninterruptable power source devices, each power source device includes at least one of an operation mode monitoring means for a logic operation on the output of the AC input monitoring circuit of each uninterruptable power source devices to feed the result thereof as a mode controlling signal to the mode controlling means, a parallel synchronizing signal generating means for a logic operation on the output of an oscillating circuit which drives the invertor in each uninterruptable power source devices and, on detection of abnormality in the AC input, feeding the result thereof as a trigger pulse to the oscillating circuit, and a synchronization monitoring means for a logic operation on the output from the oscillating circuit in each uninterruptable power source devices and, when the differences between the phase of the output from the oscillating circuit of one of the triport uninterruptable power source devices and that from the oscillating circuits of remaining triport uninterruptable power source devices exceed the prescribed level, issuing a parallel-off signal to open the paralleling switch of said one triport uninterruptable power source device. |
