(19)
(11) EP 1 087 643 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.12.2003 Bulletin 2003/50

(43) Date of publication A2:
28.03.2001 Bulletin 2001/13

(21) Application number: 00203262.1

(22) Date of filing: 20.09.2000
(51) International Patent Classification (IPC)7: H05B 39/08, H02P 9/48
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 22.09.1999 JP 26844899

(71) Applicant: Mitsuba Corporation Co., Ltd.
Kiryu-shi, Gunma-ken (JP)

(72) Inventors:
  • Arai, Makoto
    Kiryu-shi, Gunma-ken (JP)
  • Shimoda, Yukihiro
    Maebashi-shi, Gunma-ken (JP)
  • Suzuki, Takashi
    Kiryu-shi, Gunma-ken (JP)

(74) Representative: Waxweiler, Jean et al
Dennemeyer & Associates Sàrl P.O. Box 1502
1015 Luxembourg
1015 Luxembourg (LU)

   


(54) Lamp lighting control circuit


(57) In a lamp lighting control circuit according to claim 1 for lighting a lamp (5) with an AC voltage output from an electric generator (2) which rotates in conjunction with an engine, a switching device (SCR2) is connected between the electric generator (2) and the lamp (5) and the switching device (SCR2) is turned on after a delay (Td) from a point of time (T1) when either one of positive and negative half-waves of said AC voltage begins to be generated from said electric generator (2). Preferably, the control circuit may further comprise a lamp effective voltage monitoring circuit (7a) for monitoring an effective voltage of the lamp (5), wherein said lamp effective voltage monitoring circuit (7a) prevents the turning on of the thyristor when it detects an overvoltage of said lamp (5).






Search report