Control system, method and product for uninterruptible power supply
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United States of America Patent
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Nov 25, 2008
Grant Date -
Oct 5, 2006
app pub date -
Mar 31, 2005
filing date -
Mar 31, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A method for controlling an uninterruptible power supply (UPS) for servicing a load is disclosed. The UPS has a bypass feed path operable in parallel with an inverter feed path, the bypass feed path being engagable with the load via a first switch, and the inverter feed path and being engagable with the load via a second switch. The method includes: generating a paralleling detection signal indicative of the bypass feed path operating to service the load in parallel with the inverter feed path; and, in response to the presence of the paralleling detection signal, modifying a control signal to an inverter such as to drive toward equalization the bypass current and the inverter current. As a result, and in response to the two paths operating to service the load in parallel, the method tends to cancel circulation current generated between the bypass feed path and the inverter feed path.
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