Electric lamp and discharge devices: systems – With automatic shunt and/or cutout – Supply circuit current and/or potential actuated switch
Patent
1993-04-22
1995-07-25
Lee, Benny
Electric lamp and discharge devices: systems
With automatic shunt and/or cutout
Supply circuit current and/or potential actuated switch
315122, 315125, 315119, 315106, 315107, H05B 3702
Patent
active
054365295
ABSTRACT:
A series-resonant ballast for powering at least one gas discharge lamp (16) having heatable filaments (12,15) includes: DC voltage input terminals (B+,B-); an oscillating resonant converter (55,26,51,52,53) for producing high frequency voltage for application to the gas discharge lamp; a control circuit (58) able to receive a control signal from the DC input terminals and from the resonant converter and operable to initiate and stop the oscillations; and direct current blocking circuits (57,50) coupled across the filaments (12,15) and operable to stop flow of the control signal from the DC input terminals, thereby the ballast will not oscillate and will not draw any power from the DC input terminals, whenever the gas discharge lamp is: (i) removed from the output terminals, (ii) is defective, or (iv) is inoperative.
REFERENCES:
patent: 3084294 (1964-04-01), Grunwaldt
patent: 4461980 (1984-07-01), Nilssen
patent: 4616158 (1986-10-01), Krummel et al.
patent: 4710682 (1987-03-01), Zuchtriegel
patent: 5004955 (1991-04-01), Nilssen
patent: 5179509 (1993-01-01), Ling
Lee Benny
Ratliff Reginald A.
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