Method and apparatus for controlling an oscillating circuit of a

Details Method and apparatus for controlling an oscillating circuit of a Method and apparatus for controlling an oscillating circuit of a

1995-06-14

1997-04-22

Pascal, Robert

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315224, 315DIG7, H05B 3702

Patent

active

056231881

ABSTRACT:
A control device for a low-pressure fluorescent lamp placed in an oscillating circuit comprises a circuit for the detection of the frequency of the current in the lamp to deliver an information element at output as a function of the lit or unlit state of the lamp. This information element may be used to activate a first circuit to detect the end of an alternation in the lamp or a second circuit to detect the end of an alternation in the lamp, making it possible to let the lamp work at the resonance frequency of the oscillating circuit or at a frequency higher than the resonance frequency.

REFERENCES:
patent: 4868725 (1989-09-01), Nuns
patent: 5212428 (1993-05-01), Sasaki et al.
patent: 5233273 (1993-08-01), Waki et al.
patent: 5444336 (1995-08-01), Ozawa et al.
patent: 5485059 (1996-01-01), Yamashita et al.

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