Fluorescent lamp circuit with regulation responsive to voltage,

Details Fluorescent lamp circuit with regulation responsive to voltage, Fluorescent lamp circuit with regulation responsive to voltage,

1986-06-26

1988-12-13

Moore, David K.

Electric lamp and discharge devices: systems

Plural power supplies

Plural diverse pulsating or a.c. supplies

315176, 315278, 315287, 315209R, 315DIG4, 315DIG7, 315307, 315102, 315308, H05B 4124, H05B 41392, H05B 41233

Patent

active

047913380

ABSTRACT:
In a fluorescent lamp, a "soft" start-up circuit initially applies a lamp, or inter-electrode, voltage which is limited to a peak voltage that will not start the lamp prior to heating of the lamp cathode to the proper temperature. The lamp cathode is then heated to the proper start-up temperature after which the lamp voltage is increased to a value well in excess of the ignition voltage required for all lamp types and operating characteristics in initiating lamp operation. The increased lamp voltage is applied in a pulsed manner until the lamp is ignited, whereupon the lamp may be operated at normal lamp current and cathode voltages or the lamp filaments may even be turned off with a consequent savings in input power.

REFERENCES:
patent: 4004187 (1977-01-01), Walker
patent: 4004188 (1977-01-01), Cooper
patent: 4234822 (1980-11-01), Garrison et al.
patent: 4327309 (1982-04-01), Wallot
patent: 4358716 (1982-11-01), Cordes et al.
patent: 4477748 (1984-10-01), Grubbs
patent: 4525648 (1985-06-01), De Bijl et al.
patent: 4585974 (1986-04-01), Stupp et al.

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