Ballast containing protection circuit for detecting rectificatio

Details Ballast containing protection circuit for detecting rectificatio Ballast containing protection circuit for detecting rectificatio

1994-08-02

1996-11-12

Pascal, Robert J.

Electric lamp and discharge devices: systems

With automatic shunt and/or cutout

315307, 315121, 315DIG5, H05B 3700

Patent

active

055743358

ABSTRACT:
A ballast includes an inverter for providing an AC voltage to a discharge lamp. As the lamp approaches end-of-life, a DC voltage component develops across the lamp. The ballast includes circuitry for monitoring the condition of each of the cathodes by measuring this DC voltage component. After a predetermined increase in this DC voltage component, the inverter is disabled in order to prevent excessive heating of the cathodes. The inverter is also disabled as a result of a resonant or near resonant mode condition of a tank circuit caused by an open circuit condition or a leaking lamp.

REFERENCES:
patent: 4503363 (1985-03-01), Nilssen
patent: 5023516 (1991-06-01), Ito et al.
patent: 5111114 (1992-05-01), Wang
patent: 5138235 (1992-08-01), Sun et al.
patent: 5142202 (1992-08-01), Sun et al.
patent: 5262699 (1993-11-01), Sun et al.

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