Battery charging and emergency supply circuit

Details Battery charging and emergency supply circuit Battery charging and emergency supply circuit

H - Electricity

02

J

320/12, 320/4

H02J 7/00 (2006.01)

Patent

CA 1098961

CM-76332 BATTERY CHARGING AND EMERGENCY SUPPLY CIRCUIT ABSTRACT A circuit provides a regulated voltage from a primary source of power to a load and maintains the charge on a battery for standby use. A Zener diode paralleling the battery provides clamping during charging, when batteries are cold, or if the battery should fail open. Power from the primary source is supplied through a transistor having the load in the emitter circuit and having the battery coupled to its base. A lamp, chosen to provide the desired charging current, is coupled across the collector-base junction for forward biasing of the transistor and also provides a visual indication that the primary source is operative.

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