Electric lamp and discharge devices: systems – Discharge device and/or rectifier in the supply circuit – Discharge device and/or rectifier in the primary circuit of...
Patent
1982-12-27
1985-01-22
Dixon, Harold
Electric lamp and discharge devices: systems
Discharge device and/or rectifier in the supply circuit
Discharge device and/or rectifier in the primary circuit of...
315178, 315201, 315219, 315223, 315289, H05B 3700
Patent
active
044954468
ABSTRACT:
An energy efficient lighting unit is described designed for functional similarity to the incandescent light used in the home. The lighting unit utilizes a metal vapor arc lamp as the main source of light supplemented by a standby filamentary light source. The lighting unit includes means for converting 60 hertz ac to dc, and a dc energized operating network containing a three transistor switch. The transistor switch is used to provide dc and low frequency (120 Hz) energization to the filament, and high frequency energization for both filament and arc lamp. The high frequency energization, which starts and transitions the arc lamp, is discontinued after the arc lamp is started. In the final run state, the arc lamp, which is serially connected with the filament across the dc supply, is ballasted by the filament. The transistor switch is controlled in its operation by control logic provided by an integrated circuit, which provides a complex control sequence, optimized for minimum electromagnetic interference for normal starts, "hot restarts", and a failure state, called "End of Life" in which starting attempts are discontinued.
REFERENCES:
patent: 4320325 (1982-03-01), Anderson
patent: 4350930 (1982-09-01), Peil et al.
Brown Thomas A.
Dissosway Marc A.
Peil William
Vamvakas Spiro
Dixon Harold
General Electric Company
Lang Richard V.
McMahon John P.
Schlamp Philip L.
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