Electronic ballast for gas discharge lamps

Details Electronic ballast for gas discharge lamps Electronic ballast for gas discharge lamps

1991-01-29

1992-05-26

Mis, David

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Plural periodic switches or multiple contact periodic switch

315149, 315159, 315176, 315209R, 315225, 315DIG2, 315DIG5, H05B 4124, H05B 4136

Patent

active

051171619

ABSTRACT:
An improved electronic ballast inverter for a gas discharge lamp includes an oscillator having at least two switching transistors for operating the gas discharge lamp at a high frequency during steady-state operation, a triggering circuit for initiating the operation of the oscillator, and an electrical circuit connected to the oscillator for gradually increasing the base current of at least one of the switching transistors immediately after start-up in order to delay the gas breakdown and thereby to produce preheating of the gas discharge lamp during startup.

REFERENCES:
patent: 3500455 (1970-03-01), Ross et al.
patent: 4538095 (1985-08-01), Nilssen
patent: 4734624 (1988-03-01), Nagase et al.
patent: 4922154 (1990-05-01), Cacoub
patent: 4949013 (1990-08-01), Zuchtriegel
patent: 4952842 (1990-08-01), Bolhuis et al.
patent: 5001400 (1991-03-01), Nilssen

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