EP 0648068 B1 19980812 - Circuit for operating electrical lamps
Title (en)
Circuit for operating electrical lamps
Title (de)
Schaltungsanordnung zum Betrieb elektrischer Lampen
Title (fr)
Circuit d'alimentation de lampes électriques
Publication
Application
Priority
DE 4334076 A 19931006
Abstract (en)
[origin: EP0648068A1] The invention relates to a circuit arrangement for operating electric lamps, in particular fluorescent lamps. The circuit according to the invention preferably comprises a free-running half-bridge invertor 2, 3 which is provided with a disconnecting device which disconnects the invertor in the case of a faulty lamp L by cutting off the control signal from a transistor 3 of the half-bridge. The disconnecting device contains as essential elements a field effect transistor 23 which is connected in parallel with the control electrode of the transistor 3, a bistable multivibrator 17, 18 which drives the gate of the field effect transistor 23, and a threshold-value switch 26 which resets the bistable multivibrator 17, 18 in the case of a faulty lamp L, leading to the field effect transistor 23 switching on and thus the invertor being disconnected. <IMAGE>
IPC 1-7
IPC 8 full level
H05B 41/285 (2006.01)
CPC (source: EP)
H05B 41/2855 (2013.01)
Designated contracting state (EPC)
BE DE FR GB IT NL
DOCDB simple family (publication)
EP 0648068 A1 19950412; EP 0648068 B1 19980812; DE 4334076 A1 19950608; DE 59406663 D1 19980917
DOCDB simple family (application)
EP 94113515 A 19940830; DE 4334076 A 19931006; DE 59406663 T 19940830