EBL having a feedback circuit and a method for ensuring low temp

Details EBL having a feedback circuit and a method for ensuring low temp EBL having a feedback circuit and a method for ensuring low temp

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.

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