High-efficiency incandescent lamp power controller

Details High-efficiency incandescent lamp power controller High-efficiency incandescent lamp power controller

1996-02-26

1999-01-12

Pascal, Robert J.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315224, 323282, H05B 3702

Patent

active

058595066

ABSTRACT:
A high-efficiency low-cost electronic controller circuit for powering incandescent lamps which provides constant RMS voltage output from a battery or other varying output DC supply. The controller prolongs lamp life by limiting the cold filament in-rush power thereby reducing filament thermal shock deterioration. The controller further prolongs lamp life by supplying rectified AC power which reduces lamp filament embrittlement. A supply voltage monitor indicates a low-battery condition by flashing the lamp. A battery tester enables determination of the battery voltage which is indicated by pulse-coded modulation of the incandescent lamp brightness. A transistor contained in the controller eliminates the usual high-current mechanical power switch.

REFERENCES:
patent: 4230970 (1980-10-01), Pitter et al.
patent: 4902958 (1990-02-01), Cook, II

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