Maximized battery run-time in a parallel UPS system
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United States of America Patent
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Sep 18, 2012
Grant Date -
Apr 1, 2010
app pub date -
Dec 3, 2009
filing date -
Jul 6, 2005
priority date (Note) -
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Abstract
An uninterruptible power supply (UPS) includes a plurality of UPS modules. Each of the UPS modules has a battery that provides power to a protected load in the event of a utility power failure. A plurality of controllers control how much power each of the batteries deliver to the protected load, and a communication bus allows the controllers to exchange information about the battery voltages. One of the controllers calculates the average battery voltage of the plurality of batteries and adjusts the amount of energy provided by an individual battery such that the battery voltage is about equal to the average battery voltage.
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