Variable frequency current control device for discharge lamps

Details Variable frequency current control device for discharge lamps Variable frequency current control device for discharge lamps

1983-01-03

1985-02-05

Dixon, Harold

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315210, 315219, 315224, 315239, H05B 3702

Patent

active

044980310

ABSTRACT:
A control circuit for starting and operating a gas discharge lamp comprising a variable frequency waveform generator coupled to the discharge lamp via a non-resonant coupling network that includes a reactance type ballast impedance. The lamp current is monitored to automatically vary the frequency of the variable frequency generator as a function of the lamp current so as to vary the reactance of the ballast impedance in a sense to regulate or limit the lamp current.

REFERENCES:
patent: 2928994 (1960-03-01), Widakowich
patent: 3072822 (1963-01-01), Holmes
patent: 3265930 (1966-08-01), Powell
patent: 3449629 (1969-06-01), Wigert et al.
patent: 3611021 (1971-10-01), Wallace
patent: 3890537 (1975-06-01), Park et al.
patent: 4060752 (1977-11-01), Walker
patent: 4253046 (1981-02-01), Gerhard et al.

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