EP 0558772 B1 19960918 - Circuit arrangement for operating several fluorescent lamps with one ballast
Title (en)
Circuit arrangement for operating several fluorescent lamps with one ballast
Title (de)
Schaltungsanordnung zum Betreiben mehrerer Leuchtstofflampen mit einem Vorschaltgerät
Title (fr)
Circuit pour le fonctionnement de plusieurs lampes fluorescentes avec un ballast
Publication
Application
Priority
EP 92103567 A 19920302
Abstract (en)
[origin: EP0558772A1] If a single electronic ballast (1, 2, 3) is used for the joint operation of at least two fluorescent lamps (LL1, LL2), then, even in the event of one fluorescent lamp being deactivated in the case of a defect, the operation of the other fluorescent lamps is intended to be maintained without defect. For this purpose, a switching device (S1, 5) is arranged between the individual fluorescent lamps and lamp inductors (DR1, DR2) allocated individually to them. This switching device (S1, 5) is triggered by a defect condition, in the case of which the starting voltage is applied to one of the fluorescent lamps for longer than a predetermined time interval (t1). On switching over, the lamp circuits are jointly connected to only one of the lamp inductors. A single series-resonant circuit is formed from the two series-resonant circuits of the two lamp circuits, in which single series-resonant circuit it is irrelevant which of the fluorescent lamps is deactivated, and no high starting voltage occurs as long as only one of the fluorescent lamps is illuminated. <IMAGE>
IPC 1-7
IPC 8 full level
H05B 37/04 (2006.01); H05B 41/285 (2006.01)
CPC (source: EP)
H05B 41/2855 (2013.01); H05B 47/29 (2020.01)
Designated contracting state (EPC)
AT DE FR GB IT NL
DOCDB simple family (publication)
EP 0558772 A1 19930908; EP 0558772 B1 19960918; AT E143208 T1 19961015; DE 59207186 D1 19961024
DOCDB simple family (application)
EP 92103567 A 19920302; AT 92103567 T 19920302; DE 59207186 T 19920302