Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Plural circuit elements
Patent
1980-06-26
1983-01-04
Chatmon, Jr., Saxfield
Electric lamp and discharge devices: systems
Combined load device or load device temperature modifying...
Plural circuit elements
315 53, 315DIG4, 315240, 315362, 315 74, 315DIG5, H01J 744, H01J 1734, H01J 1978, H01J 2996
Patent
active
043674348
ABSTRACT:
A fluorescent lampholder fitting has a fluorescent lamp having first and second ends respectively provided with starting filaments. The lamp is supported by a housing which also encloses a solid-state fluorescent ballast and which also incorporates a male screw base electrical connector for supporting the housing in a portable lamp or lighting fixture. The male screw base is provided with three electrical input connections so configured to be electrically connected and selectively switched when installed in a three-way lampholder of the portable lamp or lighting fixture. The lampholder fitting is provided with a center-tapped step-down transformer which has three terminals attached to the three respective connections of the three-way male screw base. The step-down transformer has a single low-voltage secondary winding which connects to the input terminals of a full-wave bridge rectifier which has its rectified output connected to a high frequency oscillator. The oscillator output drives the primary winding of a step-up transformer having a tapped secondary winding wherein the taps of a first secondary segment are connected to one lead of each respective lamp filament, and wherein the taps terminating at least one other secondary winding segment are connected to both leads of one lamp filament whereby the first secondary winding segment provides relatively high voltage lamp running current and the second segment provides relatively low voltage filament heating current.
REFERENCES:
patent: 3323013 (1967-05-01), Lord
patent: 3754160 (1973-08-01), Jensen
patent: 3935505 (1976-01-01), Spiteri
patent: 4082981 (1978-04-01), Morton et al.
patent: 4146820 (1979-03-01), Bessone et al.
patent: 4163925 (1979-08-01), Gyursaszky
patent: 4173730 (1979-11-01), Young et al.
patent: 4178535 (1979-12-01), Miller
patent: 4284925 (1981-08-01), Bessone et al.
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