Auxiliary battery operation detection circuit

Details Auxiliary battery operation detection circuit Auxiliary battery operation detection circuit

1990-10-12

1993-01-05

Pellinen, A. D.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307150, 307 48, 340636, H02J 904

Patent

active

051773716

ABSTRACT:
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.

REFERENCES:
patent: 4451742 (1984-05-01), Aswell
patent: 4528459 (1985-07-01), Wiegel
patent: 4709318 (1987-11-01), Gephart et al.
patent: 4860185 (1989-08-01), Brewer et al.
patent: 4965462 (1990-10-01), Crawford
patent: 4965828 (1990-10-01), Ergott, Jr. et al.

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