Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1999-02-06
2000-09-26
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
320 48, G08B 2100
Patent
active
061247979
ABSTRACT:
An apparatus and method for determining the efficacy of the backup batteries connected in series that are used to supply electrical power to a load in the event of an interruption of an AC electrical input power source which normally supplies electrical power to the load and maintains the backup batteries in a state of ready charge includes measuring the AC ripple voltage across a minimum of one of the backup batteries and comparing the AC ripple voltage to a minimum and a maximum threshold. In the event the AC ripple voltage exceeds the maximum threshold an alarm is activated to indicate that a failure of at least one of the backup batteries has occurred and is in need of servicing. In the event the AC ripple voltage falls below the minimum threshold a determination is made as to whether the backup batteries are supplying electrical power to the load. If they are supplying power, then the loss of AC ripple is expected under this condition and the backup batteries are assumed to be functioning properly. However, if the backup batteries are not supplying power to the load, the alarm is activated to indicate that a failure of at least one of the backup batteries has occurred and is in need of servicing. Methods of establishing the minimum and maximum threshold values are discussed including ways of automatically establishing the thresholds when the AC ripple voltage is measured across a minimum of two of the backkup batteries.
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Hofsass Jeffery A.
Huang Sihong
Rinne, Jr. Risto A
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