EP 1191824 A3 20031217 - Electronic ballast for fluorescent lamp
Title (en)
Electronic ballast for fluorescent lamp
Title (de)
Elektronisches Vorschaltgerät für eine Leuchtstofflampe
Title (fr)
Ballast électronique pour une lampe fluorescente
Publication
Application
Priority
FI 20002069 A 20000920
Abstract (en)
[origin: EP1191824A2] The invention relates to an electronic ballast for a fluorescent lamp, the lamp load circuit being connected between the inverter power switch elements (S1, S2). The lamp load circuit comprises an inductor (LR) in a series connection with the lamp. Prior to the ignition of the lamp, the lamp load circuit also includes a capacitor (CR) in a series connection with the heating transformer primary winding (T1a), this series connection being in parallel with the lamp. The heating current is supplied to the lamp cathodes solely via the heating transformer secondary windings (T1b, T1c), whereby the heating current can be shut off by way of setting a switch element (S3) that is in parallel with the transformer primary winding (T1a) in an ON condition. The heating current may be controlled to a desired level by driving the switch (S3) ON and OFF with a pulse-width-controlled drive signal. <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] US 5656891 A 19970812 - LUGER SIEGFRIED [AT], et al
- [AD] EP 0589081 B
- [A] EP 0769889 A1 19970423 - PHILIPS ELECTRONICS NV [NL]
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
EP 1191824 A2 20020327; EP 1191824 A3 20031217; FI 108105 B 20011115; FI 20002069 A0 20000920
DOCDB simple family (application)
EP 01660174 A 20010919; FI 20002069 A 20000920