(19)
(11) EP 2 033 499 A1

(12)

(43) Date of publication:
11.03.2009 Bulletin 2009/11

(21) Application number: 07729872.7

(22) Date of filing: 04.06.2007
(51) International Patent Classification (IPC): 
H05B 41/282(2006.01)
H02M 3/335(2006.01)
 H05B 41/285(2006.01)
(86) International application number:
PCT/EP2007/055485
(87) International publication number:
WO 2007/147725 (27.12.2007 Gazette 2007/52)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK RS

(30) Priority: 23.06.2006 CN 200610093282

(71) Applicant: Osram Gesellschaft mit beschränkter Haftung
81543 München (DE)

(72) Inventors:
  • GAO, Wei
    Guangzhou, Guangdong 511400 (CN)
  • HECKMANN, Markus
    Guangzhou City, Guangdong 511495 (CN)
  • LI, Ji
    Guangzhou, Guangdong 511400 (CN)
  • XUE, Yanshun
    Guangzhou, Guangdong 511400 (CN)

   


(54) METHOD FOR DETECTING THE CUTTING OFF SIGNAL OF BJT IN AN ELECTRONIC BALLAST AND THE ELECTRONIC BALLAST