Global Patent Index - EP 0871347 B1

EP 0871347 B1 2000-06-21 - Ballast with automatic restart

Title (en)

Ballast with automatic restart

Title (de)

Elektronisches Vorschaltgerät mit automatischem Wiederanlauf

Title (fr)

Ballast à réamorçage automatique

Publication

EP 0871347 B1 (DE)

Application

EP 98106202 A

Priority

DE 19715341 A

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 (main, further and additional classification)

H05B 41/00

IPC 8 full level (invention and additional information)

H05B 41/298 (2006.01)

CPC (invention and additional information)

H05B 41/2985 (2013.01); Y10S 315/07 (2013.01)

Designated contracting state (EPC)

AT BE CH DE DK ES FI FR GB GR IE IT LI NL PT SE

EPO simple patent family

EP 0871347 A1 19981014; EP 0871347 B1 20000621; AT 194051 T 20000715; DE 19715341 C1 19981015; DK 0871347 T3 20001002; ES 2147036 T3 20000816; GR 3033943 T3 20001130; PT 871347 E 20001229; US 6043612 A 20000328

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