Dimming circuit with saturated semiconductor device

Details Dimming circuit with saturated semiconductor device Dimming circuit with saturated semiconductor device

1973-08-27

1976-02-03

Heyman, John S.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Plural load device systems

315DIG4, 315DIG5, 315224, 315276, H05B 3702

Patent

active

039366960

ABSTRACT:
A fluorescent lamp is operated by a-c pulses having a pulse length sufficiently short that the lamp acts like slightly positive impedances. A pulse modulator which produces the pulses has a power transistor biased to saturation. However, varying the base drive of the saturated transistor causes a generally linear change in tube current to permit tube dimming and control. A servo circuit provides feedback control of the base drive to automatically compensate for variable effects to maintain constant tube lighting. Tube dimming is obtained by adjusting the feedback circuits of the servo.

REFERENCES:
patent: 3611024 (1971-10-01), Nakatsu et al.
patent: 3619716 (1971-11-01), Spira
patent: 3681654 (1972-08-01), Quinn

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