Uninterruptible power supply diagnosing remaining battery capacity during normal external power source operation
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United States of America Patent
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Sep 15, 1992
Grant Date -
N/A
app pub date -
Jul 23, 1990
filing date -
Jul 25, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A power supply is energized by an external power source and a battery, and supplies electric power to a load. The power supply includes a battery voltage detector and a current detector for detecting a discharge current from the battery. The remaining capacity of the battery is detected in accordance with a change in the battery voltage when the external power source is free of power failure. The battery voltage change is defined as the difference between an initial voltage of the battery and an active voltage of the battery obtained when the battery is discharged by the detected discharge current for a predetermined period of time.
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