Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1992-11-05
1994-11-22
Pascal, Robert J.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315209R, 315224, 315DIG7, G05F 100
Patent
active
053672283
ABSTRACT:
The present invention is directed to a control circuit for providing a substantially constant current to a high-pressure sodium lamp. The control circuit preferably comprises a circuit for providing a rectified voltage signal, and a ballast having first and second contacts to operatively connect the lamp therebetween. The ballast generates and controls a peak current through the lamp based on the value of a controlled voltage. The control circuit further comprises a current sensor to sense the amount of current through the lamp, and a buck-boost voltage control circuit to control the value of the controlled voltage in order to provide a substantially constant peak current through the lamp based on the amount of current sensed by the current sensor. By controlling the amount of voltage seen by the lamp, the buck-boost voltage control circuit controls the amount of current through the lamp, thereby providing constant color temperature regardless of the fluctuations in lamp impedance.
REFERENCES:
patent: 4535271 (1985-08-01), Holmes
patent: 4928038 (1990-05-01), Nerone
patent: 5128592 (1992-07-01), Dean et al.
Kachmarik David J.
Nerone Louis R.
Rutan Douglas M.
Corwin Stanely C.
General Electric Company
Hawranko George E.
Pascal Robert J.
Philogene Haissa
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