Parallel operation method for an uninterruptible power supply apparatus
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United States of America Patent
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Jun 13, 2006
Grant Date -
Oct 2, 2003
app pub date -
Sep 9, 2002
filing date -
Mar 28, 2002
priority date (Note) -
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Abstract
A method for parallel non-redundancy operation of uninterruptible power supply apparatuses having a bypass circuit without using an additional common circuit. In the method of operating in parallel uninterruptible power supply apparatuses, each apparatus has two operational modes, a bypass feeding mode and an inverter feeding mode. An off-instruction for an AC switch that is turned on in the bypass feeding mode of one of the uninterruptible power supply apparatuses is produced in the respective uninterruptible power supply apparatuses when operated in the inverter feeding mode. The off-instruction is produced based on detection of coincidence of a bypass feeding signal which is active during the bypass feeding mode and a ready signal which becomes active when the inverter feeding mode is ready.
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