(19)
(11) EP 2 273 854 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.03.2015 Bulletin 2015/11

(43) Date of publication A2:
12.01.2011 Bulletin 2011/02

(21) Application number: 10005221.6

(22) Date of filing: 19.05.2010
(51) International Patent Classification (IPC): 
H05B 41/288(2006.01)
 H05B 41/38(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 SE SI SK SM TR
Designated Extension States:
BA ME RS

(30) Priority: 24.06.2009 JP 2009150311

(71) Applicant: Panasonic Corporation
Osaka 571-8501 (JP)

(72) Inventor:
  • Nagata, Satoru
    Kobe Hyogo 658-0082 (JP)

(74) Representative: Rüger, Barthelt & Abel 
Postfach 10 04 61
73704 Esslingen a.N.
73704 Esslingen a.N. (DE)

   


(54) High pressure discharge lamp lighting device, illumination fixture and illumination system using thereof


(57) [Object] To provide a high pressure discharge lamp lighting device capable of reducing an excessive stress applied to the high-pressure discharge lamp and realizing a smooth lighting.
[Means for Settlement] A high pressure discharge lamp lighting device includes a power conversion circuit which converts a voltage into power required for a high-pressure discharge lamp DL connected as a load and realizes a stable lighting of the high-pressure discharge lamp DL by receiving an output voltage Vdc from a DC power source as an input and including at least an inductor L2, a diode D2 and a switching element Q2, and a control circuit 3 for controlling the power conversion circuit, wherein, for a predetermined period immediately after dielectric breakdown in the high-pressure discharge lamp DL, a lamp current is controlled by fixing a switching-on time brought by the switching element Q2 in the power conversion circuit to a predetermined on time Ton.







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