| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an uninterruptible power supply system, its power supply control method, and an uninterruptible power supply unit, capable of supplying stable power supply voltage always to a load device by duplicating an input power supply and a power supply unit so that fluctuation in transient output voltage at the moment of switching of power supply units is suppressed when one input power supply fails. <P>SOLUTION: A power supply voltage monitoring circuit 5 detects the occurrence of power failure of a first commercial power supply 1 and a second commercial power supply 2. A current balance control circuit 6 controls load distribution in feeding to a load device 7 by adjusting balance, with the output currents of a first power supply unit 3 and a second power supply unit 4 being input. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
