Uninterruptible power supply systems and methods using rectified AC with current control
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United States of America Patent
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Jun 22, 2004
Grant Date -
Sep 5, 2002
app pub date -
Mar 2, 2001
filing date -
Mar 2, 2001
priority date (Note) -
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Abstract
An uninterruptible power supply (UPS) system includes an AC input port, a DC input port, and an output port configured to be connected to an AC load. A rectifier circuit is coupled to the AC input port, and a power transfer control circuit is coupled to the rectifier circuit output, the DC input port and the output port. The power transfer control circuit produces a DC voltage at the AC load from a rectified voltage produced by the rectifier circuit in a first mode of operation and from a DC voltage at the DC input port in a second mode of operation. A current control circuit, e.g., a boost regulator, may control a current from at least one of the rectifier circuit and the DC input port responsive to a control input. A DC/DC converter circuit may be coupled between the DC input port and the output port.
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