| 摘要 |
The current invention is comprised of a method and apparatus for monitoring the condition of backup batteries, especially those associated with an on-line, uninterruptible power supply driving a critical load. This is accomplished by measuring an AC ripple current induced into the backup batteries by the UPS, comparing the amplitude of the AC ripple current to a low level limit and to a high level limit determined by the UPS operating parameters and the critical load, and indicating an alarm condition when the AC ripple current falls outside the range defined by the low level and high level limits. The present invention also provides an apparatus for monitoring the condition of backup batteries associated with an on-line UPS and includes an AC current probe connected to the backup batteries, an AC ammeter connected to the current probe for measuring the AC ripple current across the backup batteries, an alarm indicator connected to the AC ammeter, having both a high level and a low level detection means, which is activated when the amplitude of the AC ripple current falls outside the range defined by the low and high levels. Also, an AC ripple voltage created by the AC ripple current can be measured instead of the AC ripple current to determine the operational status of the batteries.
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