Current driven gain controlled electronic ballast system

Details Current driven gain controlled electronic ballast system Current driven gain controlled electronic ballast system

1984-01-27

1986-09-02

Moore, David K.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

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

315221, 315223, 315224, 363 23, H05B 4124, H05B 4136

Patent

active

046098500

ABSTRACT:
A current driven gain controlled electronic ballast system (100) is provided having a power source (112) for actuating a pair of gas discharge tubes (140 and 140'). The ballast system (100) includes a filter network (111) which is connected to the power source (112) for establishing a substantially constant voltage signal and suppressing harmonic frequencies generated by the electronic ballast system (100). An induction circuit (115) is coupled to the filter network (111) for generating a voltage across the gas discharge tubes (140 and 140') responsive to the driving current. The induction circuit (115) includes an automatic gain control network (117) to maintain the driving current at a predetermined value and includes a trigger network (117) for generating a switching signal. A switching circuit (113) is coupled to the induction circuit (115) for establishing the driving current at a substantially constant and predetermined frequency responsive to the switching signal established by the trigger circuit (117).

REFERENCES:
patent: 3038134 (1962-06-01), Forssell
patent: 4127795 (1978-11-01), Knoll
patent: 4344122 (1982-08-01), Jones
patent: 4414491 (1983-11-01), Elliott
patent: 4503362 (1985-03-01), Hanlet

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