Ballast circuit utilizing a boost to heat lamp filaments and to

Details Ballast circuit utilizing a boost to heat lamp filaments and to Ballast circuit utilizing a boost to heat lamp filaments and to

1992-03-04

1993-03-02

Mis, David

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315219, 315226, 315291, 315DIG2, H05B 4129

Patent

active

051912635

ABSTRACT:
A driver circuit for one or more gas discharge lamps (102, 104, 106) includes: a self-oscillating, series-resonant oscillator (196, 198, 178, 180) for producing a constant-frequency, high-frequency output voltage for application to the lamps; an inductive voltage boost IC (144) for causing the oscillator to produce a temporary excessive boosted output voltage (300 V) when the voltage boost IC is initially activated and a steady-state boosted output voltage (250 V) thereafter, ensuring striking of the lamps and prolonging their life.

REFERENCES:
patent: 4388562 (1983-06-01), Josephson
patent: 5019959 (1991-05-01), MacDonald et al.
patent: 5063331 (1991-11-01), Nostwick

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