Line regulated ballast circuit

Details Line regulated ballast circuit Line regulated ballast circuit

1986-12-02

1989-08-29

Groody, James J.

Electric lamp and discharge devices: systems

Regulation of the control current and/or potential applied...

315199, 315279, 315206, 315224, 315DIG7, 315287, H05B 3700

Patent

active

048620394

ABSTRACT:
The present invention relates to an improved line regulated ballast circuit for use in controlling varied lighting applications such as, for example, neon signs and fluorescent tubes. The inventive circuit, when used in neon lighting applications, may include a function generator which controls the lighting of the neon tube in a manner allowing the tube to slowly write from one end to the other in alternating current. The function generator also allows such functions as flashing, modulation, steady state operation and steady state operation with dimming function. In a further aspect, the inventive circuit with transformers connected in parallel with one another, may be utilized to simultaneously control a plurality of neon tubes, fluorescent tubes, or both concurerntly. In this application, each of the transformers may be provided with a shunting mechanism designed to render the output current thereof infinitely adjustable. The inventive circuit utilizes solid state components and is significantly lighter and smaller than known ballast circuits.

REFERENCES:
patent: 1939903 (1933-12-01), Kayser
patent: 2295869 (1942-09-01), Seaman
patent: 2354696 (1944-08-01), Mettler
patent: 2961564 (1960-11-01), Kenty
patent: 4538093 (1985-08-01), Melai
patent: 4682082 (1987-07-01), MacAskill et al.
patent: 4700111 (1987-10-01), Folwell et al.
patent: 4712170 (1987-12-01), Grace
patent: 4745342 (1988-05-01), Andresen et al.

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