EP 0779768 A3 19971029 - Process and circuit for operating a discharge lamp
Title (en)
Process and circuit for operating a discharge lamp
Title (de)
Verfahren und Schaltungsanordnung zum Betrieb einer Entladungslampe
Title (fr)
Procédé et circuit pour alimenter une lampe à décharge
Publication
Application
Priority
DE 19546588 A 19951213
Abstract (en)
[origin: EP0779768A2] The load circuit contains the lamp (EL) with a parallel capacitor (C5), a series choke (L2), a capacitor (C6) and a current-measuring resistance (R2). In the preheating phase the load current is measured, an invariant desired value worked out and a clock generator activated at a free-running frequency between the pole values for lamp ignition and extinction. The ignition phase begins with load current measurement and derivation of a variable set-point. The clock generator is synchronised to the invertor frequency. This phase ends with the set-point attaining a value at which the conduction time of a half-bridge exceeds the free-running clock period.
IPC 1-7
IPC 8 full level
H05B 41/24 (2006.01); H05B 41/295 (2006.01)
CPC (source: EP KR US)
H05B 41/28 (2013.01 - KR); H05B 41/295 (2013.01 - EP US); Y10S 315/05 (2013.01 - EP US)
Citation (search report)
- [XA] EP 0359860 A1 19900328 - SIEMENS AG [DE]
- [XA] EP 0677981 A1 19951018 - KNOBEL LICHTTECH [CH]
- [XA] EP 0338109 A1 19891025 - ZUMTOBEL AG [AT]
- [XA] EP 0059064 A1 19820901 - EMI PLC THORN [GB]
- [XPAP] WO 9603017 A1 19960201 - SIEMENS AG [DE], et al
- [AP] EP 0688152 A1 19951220 - SGS THOMSON MICROELECTRONICS [FR]
Designated contracting state (EPC)
BE DE FR GB IT NL
DOCDB simple family (publication)
EP 0779768 A2 19970618; EP 0779768 A3 19971029; EP 0779768 B1 20000510; CA 2192506 A1 19970614; CA 2192506 C 20041116; CN 1155825 A 19970730; CN 1199525 C 20050427; DE 19546588 A1 19970619; DE 59605182 D1 20000615; JP H09219293 A 19970819; KR 100432541 B1 20040811; KR 970058386 A 19970731; US 5828187 A 19981027
DOCDB simple family (application)
EP 96118851 A 19961125; CA 2192506 A 19961210; CN 96121520 A 19961213; DE 19546588 A 19951213; DE 59605182 T 19961125; JP 34648896 A 19961211; KR 19960065033 A 19961213; US 76449196 A 19961212