Uninterruptible power system
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United States of America Patent
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Mar 18, 1997
Grant Date -
N/A
app pub date -
Oct 10, 1995
filing date -
Oct 10, 1995
priority date (Note) -
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Abstract
An uninterruptible power supply for providing continuous power from a power source line to a load is provided. In particular, the uninterruptible power supply may either operate in an 'Off-Line' mode or one of two 'On-Line' modes. The uninterruptible power supply operates in the 'Off-Line' mode when the power source line voltage is above a first threshold value. The uninterruptible power supply routes power from the power source line to the load in the 'Off-Line' mode. The uninterruptible power supply operates in a first 'On-Line' mode when the power source line voltage drops below a first threshold value but exceeds a second threshold voltage, or the frequency of the power source line exceeds a predetermined range. The uninterruptible power supply boosts the power source line voltage in the first 'On-Line' mode of operation and applies the boosted signal to the load. The uninterruptible power supply operates in a second 'On-Line' mode of operation when the voltage of the power source line voltage drops below a second threshold value or exceeds a third threshold value. The uninterruptible power supply routes reserve power from an energy storage device to the load in the second 'On-Line' mode of operation.
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