Method of effecting stabilized dimming of fluorescent lamps

Details Method of effecting stabilized dimming of fluorescent lamps Method of effecting stabilized dimming of fluorescent lamps

1982-04-12

1984-03-13

Dixon, Harold

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315210, 315282, 315DIG4, 315DIG2, 315220, H05B 3702

Patent

active

044370407

ABSTRACT:
In order to effect stabilized dimming of a fluorescent lamp, that is, in order to vary the power level supplied the lamp while maintaining a substantially constant filament voltage, a first, variable, inductance is included as an element of oscillator (inverter) feedback loop. The voltage across the variable inductance is clamped and coupled to a second inductance so that a voltage appears across the second inductance in proportion to the voltage appearing across the variable inductance. The voltage appearing across the second inductance is applied to the lamp filament so as to constitute a dominant component of the lamp filament voltage.

REFERENCES:
patent: 2830232 (1958-04-01), Carpenter et al.
patent: 4353009 (1982-10-01), Knoll

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