EP 0871347 B1 20000621 - Ballast with automatic restart
Title (en)
Ballast with automatic restart
Title (de)
Elektronisches Vorschaltgerät mit automatischem Wiederanlauf
Title (fr)
Ballast à réamorçage automatique
Publication
Application
Priority
DE 19715341 A 19970412
Abstract (en)
[origin: US6043612A] In an externally controlled electronic ballast, a driving circuit which requires a dedicated supply voltage is provided for the purpose of driving an inventor half bridge. The driving circuit is constructed such that the inventor half bridge blocks when the supply voltage Vcc falls below a threshold value UVLO. Via a self-holding controllable electronic switch and a Z diode DZ2, a voltage monitoring circuit draws the supply voltage Vcc below the threshold value UVLO when an excessively high lamp voltage is detected. The ballast is thereby inactive. A current sensing path which leads via at least one filament of the low-pressure gas discharge lamp serves to detect a change of lamp. The current sensing path controls a further electronic switch, which is likewise connected to the supply voltage Vcc of the driving circuit and can, when it conducts, draw said voltage further to frame than the first switch. The second electronic switch connected to the current sensing path thus permits automatic restarting of the ballast after the change of lamp by bringing the first switch into a non-conductive state again by firstly further lowering the supply voltage Vcc below the value prescribed by said switch.
IPC 1-7
IPC 8 full level
H05B 41/00 (2006.01); H05B 41/298 (2006.01)
CPC (source: EP US)
H05B 41/2985 (2013.01 - EP US); Y10S 315/07 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI NL PT SE
DOCDB simple family (publication)
EP 0871347 A1 19981014; EP 0871347 B1 20000621; AT E194051 T1 20000715; DE 19715341 C1 19981015; DE 59800177 D1 20000727; DK 0871347 T3 20001002; ES 2147036 T3 20000816; GR 3033943 T3 20001130; PT 871347 E 20001229; US 6043612 A 20000328
DOCDB simple family (application)
EP 98106202 A 19980404; AT 98106202 T 19980404; DE 19715341 A 19970412; DE 59800177 T 19980404; DK 98106202 T 19980404; ES 98106202 T 19980404; GR 20000401628 T 20000712; PT 98106202 T 19980404; US 5597498 A 19980407