Importance

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Abstract

The condition of a rechargeable battery, which is employed as a backup d-c power supply for a load in the event of an emergency and is normally charged by a d-c charging voltage through a series-connected protective fuse, is monitored by momentarily reducing the charging voltage and effectively sensing or measuring the voltage across the series-connected fuse and battery during the momentary reduction, while not affecting the load. If the battery is connected and is functioning properly and if the fuse is connected and is continuous, the sensed voltage will exceed a predetermined desired threshold level, and this normal condition may be visually and/or audibly indicated. On the other hand, if the battery is disconnected, or if the battery voltage is abnormally low, or if the fuse is absent or is open, then the sensed voltage will fall below the desired threshold level, signifying a trouble condition. When such a condition is detected, a trouble indicator provides an appropriate visual and/or audible signal.

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First Claim