Uninterruptible power supply with low power loss
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United States of America Patent
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Jun 2, 2009
Grant Date -
Nov 15, 2007
app pub date -
May 8, 2007
filing date -
May 9, 2006
priority date (Note) -
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Abstract
Disclosed is an uninterruptible power supply including a controller; a first switch circuit; a second switch circuit; a transformer having a first winding connected to a load and the first switch circuit and a second winding connected to the second switch circuit; an energy accumulation device; a DC-DC converter for boosting a DC voltage outputted from the energy accumulation device; an inverter for converting a boosted DC voltage into a first AC voltage and delivering the AC voltage to the first winding. When the energy accumulation device is supplying power, the second winding generates a second AC voltage in response to the first AC voltage, thereby the second AC voltage can regulate the voltage level of the first AC voltage which is delivered to the load according to the connection status between the second switch circuit and the second winding.
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