Method and apparatus for controlling an oscillating circuit of a low pressure fluorescent lamp

摘要

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.