Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1989-03-03
1990-08-21
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315DIG4, 315DIG7, 315278, H05B 3702, H05B 4116, H05B 4124, H05B 3704
Patent
active
049509594
ABSTRACT:
A cassette light retrofit adapted to be received in a housing portion of an existing lighting fixture from which the light tubes and door frame with diffuser have been removed comprises an open cassette enclosure having a door frame and diffuser closing the enclosure; a lightable tubing array in the cassette enclosure; a power converter in the enclosure connected to energize the lightable array; and, said cassette door frame being attachable to the fixture housing portion to replace said fixture door frame with the cassette enclosure being in said housing. The power converter uses 8 windings with isolation to improve the tracking efficiency of the sensing windings for accurate high frequency power application for the load. Also, an A.C. winding permits dimming of the lamp load by filling in chunks of voltage deleted by the dimmer.
REFERENCES:
patent: 3300633 (1967-01-01), Grimes
patent: 3395301 (1968-07-01), Iannelli
patent: 3697743 (1972-10-01), Eargle
patent: 4184194 (1980-01-01), Shofu
patent: 4404619 (1983-09-01), Ferguson
patent: 4602448 (1986-07-01), Grove
patent: 4751434 (1988-06-01), Helling et al.
patent: 4809142 (1989-02-01), Auerbach
Beckrot Anders V.
Helling James C.
Murray Scott V.
LaRoche Eugene R.
LumiTech International, L.P.
Shingleton Michael B.
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