EP 0271396 B1 19930728 - PROCESS AND DEVICE FOR IGNITING DISCHARGE LAMPS
Title (en)
PROCESS AND DEVICE FOR IGNITING DISCHARGE LAMPS
Publication
Application
Priority
FR 8616969 A 19861204
Abstract (en)
[origin: EP0271396A1] Process for igniting a discharge lamp, in particular of the arc-lamp or neon tube type, the said lamp being mounted in a series resonant circuit comprising a choke (19) and a capacitor (20), the lamp (23) being disposed in series with the choke and in parallel with the capacitor, this resonant circuit being disposed in the diagonal of a bridge to the terminals of which are supplied voltage pulses delivered by a chopped supply, characterised in that it consists in varying the chopping frequency of the energising pulses over a frequency range stretching between two predetermined extreme values which enclose the resonance frequency of the circuit or one of its harmonics in accordance with an approximately linear law, respectively increasing then decreasing, with a scanning period for this given range, in simultaneously setting to a constant and bounded value the angle of flow of the pulses measuring the ratio of the duration of the latter to their period, so that the current supplied to the lamp on each pulse is substantially reduced, in then igniting the lamp by virtue of the voltage surge created by the resonance of the circuit when the chopping frequency is equal to the resonance frequency or one of its harmonics, in detecting the flow of the current in the lamp in order to reduce the frequency of the pulses to a value substantially lower than the resonance frequency, at the same time the angle of flow being raised to an optimal value. <IMAGE>
IPC 1-7
IPC 8 full level
H05B 41/288 (2006.01)
CPC (source: EP)
H05B 41/2883 (2013.01)
Designated contracting state (EPC)
BE CH DE ES GB IT LI NL
DOCDB simple family (publication)
EP 0271396 A1 19880615; EP 0271396 B1 19930728; DE 3786762 D1 19930902; DE 3786762 T2 19931111; ES 2046212 T3 19940201; FR 2607996 A1 19880610; FR 2607996 B1 19890310
DOCDB simple family (application)
EP 87402640 A 19871124; DE 3786762 T 19871124; ES 87402640 T 19871124; FR 8616969 A 19861204