Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1988-06-09
1990-06-26
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315205, 315210, 315291, 315227R, 315DIG5, 315DIG4, 315DIG7, H05B 3702, H05B 3904, H05B 3900, G05F 100
Patent
active
049375024
ABSTRACT:
An electronic ballast circuit is provided for starting, operating and controlling the brightness of one or more fluorescent lamps. The brightness of the lamps is controlled over the full range of brightness from zero to full-rated power. The circuit power factor is controllable, and is preferably operated at a relatively high leading power factor. The circuit includes a capacitive ballast working in conjunction with a gapped transformer so as to provide the high leading power factor while, at the same time, maintaining stable and uniform brightness of the lamps. A power field effect transistor is utilized to function as a current stabilizer in conjunction with the capacitive ballast and gapped transformer. The system incorporates a dimming control circuit for increasing and decreasing the brightness of the lamps.
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"Day Ray Aviation Type Ballasts for Fluorescent Lamps Ratings & Data" published before Invention of applicant.
"Electronic Ballast Data Sheet Lighting" Avtech, published before Invention of applicant.
Official Gazette, Nov. 19, 1985, pp. 1391-1392.
Official Gazette, Apr. 2, 1985, p. 399.
Day-Ray Products, Inc.
LaRoche Eugene R.
Shingleton Michael
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