Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1996-08-16
1998-09-08
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
307150, 320106, 320134, 320135, H01H 3500, H02J 700
Patent
active
058048944
ABSTRACT:
A low voltage battery pack monitoring circuit for a battery powered electronic device is disclosed. The circuit utilizes low battery and power failure set point voltages and first and second comparison circuits to compare voltage across the device battery pack to the set point voltages. If the battery pack output voltage falls below the low battery pack set point voltages, the first comparison circuit sends a signal to a microprocessor causing a low battery indicator light to be actuated. If the battery pack output voltage continues to decrease below the power failure set point voltage, the second comparison circuit includes a comparator which changes output state and turns off selected electronic systems of the device and the device enters a suspend mode. The low battery pack set point voltage value and the power failure set point voltage value are determined using an empirical look up table.
REFERENCES:
patent: 5541490 (1996-07-01), Sengutpa et al.
patent: 5633573 (1997-05-01), Van Phuoc et al.
patent: 5666040 (1997-09-01), Bourbeau
Leeson Randal A.
Shoobridge Richard
Kaplan Jonathan S.
Shoop Jr. William M.
Telxon Corporation
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