Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1995-08-28
1997-07-08
Tso, Edward
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 49, 307 66, H01M 1046
Patent
active
056465025
ABSTRACT:
Battery charging circuits configured as a combination of current limited charging sources and a shunt regulating path to bypass current from a battery charging path through a low impedance path so that charge current can be regulated and terminated or controlled, the invention further includes combination of the circuits in emergency lighting systems utilizing conventional AC mains power in a non-emergency mode and DC battery power in an emergency mode, the battery being charged with regulation of charge current effected by said circuits when in the non-emergency mode. In the present circuits, current is by-passed from that portion of the circuit used for battery charging by provision of a low impedance alternate path through which current may also be supplied to non-emergency lamps, the alternate path supplanting prior art circuits which function by continuously turning a single path on and off for charge regulation. In primary embodiments, the circuits use the charging path to also drive the non-emergency lamps. Current through the alternate shunt regulating path drives the non-emergency lamps in the normal non-emergency mode without passing of the current through the battery.
REFERENCES:
patent: 4216410 (1980-08-01), Feldstein
patent: 4223232 (1980-09-01), Bulat
patent: 4454452 (1984-06-01), Feldstein
patent: 4890004 (1989-12-01), Beckerman
patent: 5302858 (1994-04-01), Folts
Ferranti Interdesign, Inc. "201 Analog IC Designs"1980. p. 33.
Darnell Kenneth E.
NSI Enterprises Inc.
Tso Edward
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