Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1993-10-04
1994-06-07
Gensler, Paul
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315309, 315307, 315289, 315290, H05B 3702
Patent
active
053192842
ABSTRACT:
An electronic ballast circuit for a discharge lamp, comprising a plurality of transistors connected in series across a DC power line, a driving circuit for alternately turning on/off the transistors and a first LC series resonance circuit connected to an output of the driving circuit, the first LC series resonance circuit having a coil and a plurality of condensers. According to the invention, the electronic ballast circuit comprises a damping circuit connected across the coil for absorbing an instantaneously excessive preheating current or a high voltage pulse. The electronic ballast circuit also comprises a plurality of impulse voltage absorbing devices connected at their one sides to an output side of the coil and at their other sides to a high frequency zero potential point of the DC power line for absorbing a contact high voltage pulse generated across the discharge lamp. The electronic ballast circuit further comprises a second LC series resonance circuit connected across the discharge lamp for enhancing a crest factor of a current flowing through the discharge lamp. Therefore, filaments of the discharge lamp are not subjected to a damage resulting from a high crest factor current or a high voltage pulse. This results in an increase in the life of the discharge lamp.
REFERENCES:
patent: 3334270 (1967-08-01), Nuckolls
patent: 4181872 (1980-01-01), Chermin
patent: 4350935 (1982-09-01), Spira et al.
patent: 4580078 (1986-04-01), Spannhake
patent: 4890041 (1989-12-01), Nuckolls et al.
patent: 4962336 (1990-10-01), Dodd et al.
patent: 5023516 (1991-06-01), Ito et al.
patent: 5049788 (1991-09-01), Lee
patent: 5051661 (1991-09-01), Lee
patent: 5122712 (1992-06-01), Hirschmann
patent: 5208515 (1993-05-01), Lee
Gensler Paul
Ratliff Reginald A.
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