Dimming circuit for an electronic ballast

Details Dimming circuit for an electronic ballast Dimming circuit for an electronic ballast

1980-12-19

1982-10-05

La Roche, Eugene R.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315105, 315224, 315277, 315278, 315291, 315DIG4, H05B 4129

Patent

active

043530095

ABSTRACT:
A dimmer circuit for an inverter-driven electronic ballast system. The ballast includes an output transformer having a primary winding coupled to the inverter output and a secondary winding adapted to be coupled to a lamp filament winding for supplying power to the filament. An interstage transformer has a primary winding adapted to be coupled to a lamp filament and a secondary winding coupled to an inverter input for applying a feedback signal derived from the filament current at that input. The dimmer circuit is in the form of a feedback loop that includes a winding on the primary of the output transformer, a winding on the primary of the interstage transformer, and a variable impedance coupling those windings. Varying the impedance necessarily varies the total feedback loop impedance and therefore the amount of feedback applied at the inverter output and, inversely, the power supplied to the lamp filament.

REFERENCES:
patent: 4075476 (1978-02-01), Pitel
patent: 4188661 (1980-02-01), Bower et al.

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