H - Electricity – 02 – J
Patent
H - Electricity
02
J
H02J 7/34 (2006.01) G01R 31/36 (2006.01) H02J 7/00 (2006.01) H02J 9/06 (2006.01) H02J 13/00 (2006.01)
Patent
CA 2052535
AUXILIARY BATTERY OPERATION DETECTION CIRCUIT A power supply which senses whether a primary battery is discharging to below a predetermined dead battery level or the primary battery has been removed and the system is operating from an auxiliary battery, which has a lower voltage. When the battery voltage goes below the dead voltage level, the system is in a low power mode and the power supply output voltages are satisfactory, a timer may be started. If the battery voltage does not drop to the auxiliary battery voltage level within a predetermined time, a shutdown signal is generated and the power supply ceases providing output voltage levels. In this manner the primary battery can be removed and the system can continue running on the auxiliary battery until a charged primary battery is installed and yet the primary battery discharge rate will be greatly slowed when the primary battery voltage is below a given level and the primary battery is still installed in the system.
Compaq Computer Corporation
Finlayson & Singlehurst
LandOfFree
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