PROCEDIMENTO PER L'ALIMENTAZIONE DI TENSIONE DI LAMPADE A LUMINESCENZA E DISPOSITIVO COMPRENDENTE UNA LAMPADA A LUMINESCENZA ED UN ELEMENTO DI ALIMENTAZIONE

摘要

An electric lighting system produces light by feeding an electric tension of high frequency generated in an oscillator (21) having a transformer (24) connected to electrodes of a gas discharge lamp (20). Thereby the gas in this lamp becomes ionized, emits light and exhibits plasma resonances. The frequency of the electric tension is kept on a resonance frequency of the ionized gas by using the operating gas discharge lamp and the secondary winding (27) of the transformer as a resonant tank circuit which determines the frequency of the oscillation. The oscillator operates at either a higher or lower frequency than the plasma resonance before the lamp starts. This higher or lower frequency is determined either by the saturation of the core (K) or by the inductance and stray capacitance of the primary winding (25) of the transformer. The transformer core has an air gap calculated so that the oscillator frequency may shift in the ratio of 1:4. The oscillator frequency is between 10 KHz and 1 MHz.