(19)
(11) EP 2 381 746 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.09.2016 Bulletin 2016/39

(43) Date of publication A2:
26.10.2011 Bulletin 2011/43

(21) Application number: 11162647.9

(22) Date of filing: 15.04.2011
(51) International Patent Classification (IPC): 
H05B 41/282(2006.01)
 H05B 41/298(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 23.04.2010 JP 2010100261

(71) Applicant: Panasonic Intellectual Property Management Co., Ltd.
Osaka 540-6207 (JP)

(72) Inventors:
  • Naruo, Masahiro
    Hirakata, Osaka (JP)
  • Ido, Shigeru
    Osaka, Osaka (JP)
  • Mitsuyasu, Kei
    Hirakata, Osaka (JP)

(74) Representative: Rüger, Rudolf 
Patentanwälte Dr.-Ing. R. Rüger Dipl.-Ing. H.P. Barthelt Webergasse 3
D-73728 Esslingen
D-73728 Esslingen (DE)

   


(54) Discharge lamp lighting device and illumination fixture using the same


(57) [Object] To provide a discharge lamp lighting device capable of reducing electric stress that is placed on each discharge lamp at the start time, and an illumination fixture using the same.
[Means for Settlement] A plurality of discharge lamps La are lit by AC power to which DC power of a DC power source E is converted by an inverter circuit including a switching part 1 and a resonant part 2. The discharge lamp lighting device is provided with: a drive part 3 that drives respective switching elements Q1 and Q2 constituting the switching part 1; a control part 4 that controls the drive part 3; and a lighting detection part 5 that detects the start of a semi-lighting state where a part of the plurality of discharge lamps La is lit. When the lighting detection part 5 detects the start of the semi-lighting state, the control part 4 controls the drive part 3 so as to sufficiently increase a frequency of the AC power supplied to each of the discharge lamps La to decrease an inter-terminal voltage of each of the discharge lamps La, and thereby electric stress placed on each of the discharge lamps La is reduced.







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