Reduced power consumption low battery alert device

Details Reduced power consumption low battery alert device Reduced power consumption low battery alert device

1984-08-31

1987-04-21

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

340661, 340691, 324433, 324435, G08B 2100

Patent

active

046600272

ABSTRACT:
A reduced power consumption low battery indicator comprising in the preferred embodiment a transducer driver which drives a transducer to provide an audible alert. A microprocessor is used to generate a squarewave signal to power the transducer driver whenever the battery is depleted to a first predetermined level. A first low battery sensor is used to determine when the battery is depleted to the first predetermined level and generates a signal which is directed to the microprocessor to commence generation of the signal to drive the transducer driver. A second low battery sensor is used to determine when the battery is depleted to a second predetermined level and generates an output signal which is directed to the transducer driver which then drives the transducer at a lower power consumption rate.

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patent: 3568175 (1971-03-01), Schwehr
patent: 3877001 (1975-04-01), Bogut et al.
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patent: 4143283 (1979-03-01), Graf et al.
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patent: 4471492 (1984-09-01), Mann et al.
patent: 4488115 (1984-12-01), Podhrasky
patent: 4535325 (1985-08-01), Marsh
patent: 4574276 (1986-03-01), Sato

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