Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1995-09-21
1997-11-25
Font, Frank G.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315244, 315307, 315DIG7, H05B 3702
Patent
active
056916035
ABSTRACT:
A fluorescent lighting system has: (A) a central power supply including: (i) a parallel-resonant self-oscillating bridge inverter operative to provide a 35 kHz sinusoidal output voltage at a pair of primary output terminals; (ii) a tank-inductor and a tank-capacitor parallel-connected across the primary output terminals; and (iii) plural pairs of secondary output terminals, each connected with the primary output terminals via its own dedicated current-limiting sub-circuit; thereby to prevent a load connected therewith from drawing more than a certain amount of power; thereby, in turn, to render each pair of secondary output terminals fire-hazard-safe and shock-hazard-safe; each pair of secondary power output terminals being connected with its own power output receptacle; and (B) a light-weight power cord plug-in-connected with one of the power output receptacles and having a pair of power conductors between which are connected a number of individually ballasted lighting units; each lighting unit having at least one gas discharge lamp as well as a high-power-factor ballasting assembly that includes a tuned parallel-connected LC circuit having a natural resonance frequency equal to that of the output voltage provided from the central power supply. Due to having each lighting unit parallel-resonant at the frequency of the output voltage, the drastic frequency change and concomitant loss in per-lamp light output usually occurring when adding several separately ballasted lamp loads to the output of a parallel-resonant self-oscillating power supply will not occur.
REFERENCES:
patent: 4053813 (1977-10-01), Kornrumpf
patent: 4060752 (1977-11-01), Walker
patent: 5426347 (1995-06-01), Nilssen
Font Frank G.
Ratliff Reginald A.
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