EP 0848581 A1 19980617 - Cathode filament heating circuit for a low-pressure discharge lamp
Title (en)
Cathode filament heating circuit for a low-pressure discharge lamp
Title (de)
Heizschaltung für die Wendeln einer Niederdruckentladungslampe
Title (fr)
Circuit de chauffage des cathodes d'une lampe à décharge basse-pression
Publication
Application
Priority
- FI 964972 A 19961212
- FI 971362 A 19970403
Abstract (en)
The invention relates to a filament heating circuit for the cathodes of a low-pressure discharge lamp, comprising a filament heating current capacitor (11) connected in series with electrodes (6, 7) of a lamp (3) in parallel with a lamp. In the filament heating current circuit there is connected one or more components (12, 13), which constitute a resonance circuit or affects on the operation of the main resonance circuit and are dimensioned to change the filament heating current passing through the electrodes (6, 7) as the frequency of a lamp current changes. <IMAGE>
IPC 1-7
IPC 8 full level
H05B 41/295 (2006.01)
CPC (source: EP)
H05B 41/295 (2013.01)
Citation (search report)
- [X] DE 4303595 A1 19940811 - PATENT TREUHAND GES FUER ELEKTRISCHE GLUEHLAMPEN MBH [DE]
- [X] US 5319284 A 19940607 - LEE SANG-WOO [KR]
- [X] EP 0602719 A1 19940622 - KONINKL PHILIPS ELECTRONICS NV [NL]
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 97660141 A 19971210