Electric lamp and discharge devices: systems – Current and/or voltage regulation
Patent
1983-03-09
1985-07-02
Chatmon, Saxfield
Electric lamp and discharge devices: systems
Current and/or voltage regulation
315DIG5, 315DIG7, 315205, 315207, 315226, 315307, 307252T, 323224, G05F 100, H05B 3702, H05B 3904, H05B 4136
Patent
active
045270996
ABSTRACT:
A gas discharge lamp control circuit for an inductive ballast includes anti-parallel connected controlled rectifiers connected in series with the a.c. source and the ballast and anti-parallel connected controlled rectifiers which are connected in series with a current limiting and energy diversion capacitor and in shunt with the ballast. The controlled rectifiers of the series and shunt switching assemblies are controlled so that, in any given half wave, the related controlled rectifier of the shunt switching means turns on to discharge a capacitor into the normally conducting controlled rectifier of the series switching means to produce a notch in the voltage wave form applied to the inductive ballast. The capacitor acts as a current limiting impedance and acts to permit reversal of the voltage during the notch interval in the input voltage to the ballast, thereby to increase the RMS content of the voltage wave form. An automatic low end dim setting circuit maintains the low end setting regardless of the type of lamp or ballast which is employed. A notch signal generating circuit is provided which employs two phase-shifted signals fed into a comparator and compared to a common reference level.
REFERENCES:
patent: 3414768 (1968-12-01), Peek, Jr.
patent: 3588598 (1971-06-01), Isaacs
patent: 3684919 (1972-08-01), Cramer
patent: 3913002 (1975-10-01), Steigerwald et al.
patent: 4096414 (1978-06-01), Howell
patent: 4230970 (1980-10-01), Potter et al.
patent: 4237405 (1980-12-01), Kellis
patent: 4350935 (1982-09-01), Spira et al.
patent: 4453123 (1984-06-01), Erkman
Capewell Dennis
Luchaco David G.
Spira Joel S.
Chatmon Saxfield
Lutron Electronics Co. Inc.
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