EP 0746185 B1 19990728 - Monitoring circuit for a two lamp system
Title (en)
Monitoring circuit for a two lamp system
Title (de)
Schaltungsanordnung zum Überwachen des Lampenbetriebs mindestens zweier Leuchtstofflampen
Title (fr)
Circuit de surveillance de l'état de functionnement d'un système à deux lampes
Publication
Application
Priority
EP 95108385 A 19950531
Abstract (en)
[origin: EP0746185A1] The circuit monitors the function of at least two fluorescent lamps (LL1,LL2), using a detection network (R1,..R7, C1,D1) connected to the lamp current circuits and coupled to a control circuit (5) for a switch (V3,RE,S1) allowing the lamps to be connected in parallel upon detection of lamp failure. The control circuit has a storage capacitor coupled to the detection network as the input element, its charge corresponding to the voltage across the monitored lamp current circuits, with two alternatively-activated switch stages (VI,R8,..R10,C3 ; V2,D3,D4, R11,...R14, C4), with different response thresholds used to provide the switching signals for the controlled switch.
IPC 1-7
IPC 8 full level
H05B 41/285 (2006.01)
CPC (source: EP)
H05B 41/2855 (2013.01)
Designated contracting state (EPC)
AT CH DE FR GB IT LI NL
DOCDB simple family (publication)
EP 0746185 A1 19961204; EP 0746185 B1 19990728; AT E182737 T1 19990815; DE 59506476 D1 19990902
DOCDB simple family (application)
EP 95108385 A 19950531; AT 95108385 T 19950531; DE 59506476 T 19950531