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US 7,888,816 B2Granted
Method and apparatus for maintaining uninterruptible power supplies
AssigneeLiebert Corporation
InventorRichard J. Zajkowski
Life of this patent
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Abstract
A system and method of isolating an uninterruptible power supply system is disclosed that comprises bypassing an inverter section of the power supply to couple primary power to a load bus; and, thereafter, isolating the power supply by simultaneously uncoupling the power supply from the load bus and coupling the primary power to the load bus.
Claims10
An uninterruptible power supply system comprising:
- a first uninterruptible power supply comprising a power module coupled to a first power source and an internal bypass circuit coupled to a second power source, both of the power module and the internal bypass selectively couplable to a load bus;
- a system bypass circuit coupled to either the first or second power source and selectively couplable to the load bus;
- and
- means for sequencing the system bypass circuit so that the system bypass circuit is coupled to the load only after the internal bypass is coupled to the load bus.
1 more element
Dependencies are inferred from the claim text.