Feedback control system of an electronic ballast which detects a

Details Feedback control system of an electronic ballast which detects a Feedback control system of an electronic ballast which detects a

1996-12-30

1998-06-23

Pascal, Robert

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315224, 315209R, 315106, 315DIG7, G06F 100

Patent

active

057709262

ABSTRACT:
The present invention relates to a feedback control system and method for controlling an electronic ballast for driving a lamp where the lamp requires preheating of a cathode of the lamp in order for the electronic ballast to successfully discharge into the lamp and initiate arcing operation in the lamp. The system detects the power consumption level of the lamp and, when the power consumption level indicates that the lamp is not arcing, performs a restart of the lamp wherein the restart function includes preheating the cathode with a preheating current. The present invention reduces production cost and increases safety by detecting operation in the lamp without using external elements.

REFERENCES:
patent: 4723098 (1988-02-01), Grubbs
patent: 4933605 (1990-06-01), Quazi et al.
patent: 5315214 (1994-05-01), Lesea
patent: 5546300 (1996-08-01), Lee et al.
patent: 5648702 (1997-07-01), Choi et al.

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