Single transistor ballast with filament preheating

Details Single transistor ballast with filament preheating Single transistor ballast with filament preheating

1995-06-15

1997-03-04

Pascal, Robert

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315307, 315219, 315247, 315226, 315 94, 315DIG5, H05B 3702

Patent

active

056082924

ABSTRACT:
A ballast circuit for driving a gas discharge having a source of pulsating and rectified AC (20), an energy storage circuit (30), a switch (40) that can have one end connected to an energy storage inductor and an opposite end that can be connected to circuit common; a control circuit (50) for opening and closing the switch (40) at a rate that is a function of at least a DC control current, a resonant circuit (60) that is coupled to the energy storage circuit (30) for energizing the gas discharge lamp.

REFERENCES:
patent: 4075476 (1978-02-01), Pitel
patent: 4109307 (1978-08-01), Knoll
patent: 4277728 (1981-07-01), Stevens
patent: 4392087 (1983-07-01), Zansky
patent: 5138235 (1992-08-01), Sun et al.
patent: 5144195 (1992-09-01), Konopka et al.
patent: 5399944 (1995-03-01), Konopka et al.

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