Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1996-05-10
1998-12-15
Pascal, Robert J.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315224, 315DIG4, H05B 3702
Patent
active
058501274
ABSTRACT:
A dimming ballast lamp includes a lamp, a ballast circuit for converting AC input power to AC output power, a dimming interface circuit for generating a dimming control signal having a voltage level indicative of a selected dimming level of the lamp and a dimming circuit responsive to the dimming control signal for controlling operation of the ballast circuit. A feedback control circuit detects the lamp voltage and produces a feedback control signal in response to the lamp voltage exceeding a perscribed threshold voltage level. The dimming circuit, responsive to the feedback control signal, controls operation of the ballast circuit so as to increase lamp current thereby increasing the dimming level of the lamp, ensuring low temperature ignition of the lamp and protecting against lamp shutdown.
REFERENCES:
patent: 3989976 (1976-11-01), Tabor
patent: 4005335 (1977-01-01), Perper
patent: 5422545 (1995-06-01), Felper et al.
patent: 5583402 (1996-12-01), Moisin et al.
Venkitasubrahmanian Sreeraman
Zhu Joshua
Blocker Edward
Pascal Robert J.
Philips Electronics North America Corporation
Vu David H.
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