Constant illumination, remotely dimmable electronic ballast

Details Constant illumination, remotely dimmable electronic ballast Constant illumination, remotely dimmable electronic ballast

1985-11-15

1987-12-29

Dixon, Harold

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315206, 315224, 315DIG7, H05B 3700

Patent

active

047163437

ABSTRACT:
A solid-state ballast for discharge lamps includes a device for sensing the instantaneous current flowing within the load to produce illumination. A signal representing this load current is differentially processed with an external control signal representing the desired illumination, to produce an removed signal which controls an oscillator that provides the operating signal for the load. In addition, the voltage across the load is sensed and the signal representing this voltage is fed back to a circuit which controls the oscillator so as to limit the maximum load voltage during initial start-up and when a lamp is removed.

REFERENCES:
patent: 3449629 (1969-06-01), Wigert
patent: 3611021 (1971-10-01), Wallace
patent: 4221994 (1980-09-01), Friedman et al.
patent: 4277728 (1981-07-01), Stevens
patent: 4585974 (1986-04-01), Stupp et al.

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