公开(公告)号：US09756711B2

公开(公告)日：2017-09-05

申请号：US15109567

申请日：2014-11-14

Applicant: USHIO DENKI KABUSHIKI KAISHA

Inventor： Koji Yamada

IPC: H05B41/24 ,  H05B41/288 ,  H05B41/292 ,  G03B21/20 ,  H01J61/82 ,  H05B41/392

CPC classification number: H05B41/2888 ,  G03B21/2026 ,  G03B21/2053 ,  H01J9/505 ,  H01J61/0732 ,  H01J61/20 ,  H01J61/26 ,  H01J61/822 ,  H01J61/86 ,  H05B41/2886 ,  H05B41/2887 ,  H05B41/2928 ,  H05B41/392 ,  Y02B20/202 ,  Y02B20/208 ,  Y02W30/828

Abstract: There is provide a discharge lamp lighting apparatus that comprises a discharge lamp and a power supply device configured to drive a regular lighting mode and the low electric power lighting mode in a switchable manner. The power supply device configured to control a power supply to the discharge lamp such that, in the low electric power lighting mode, after a secondary protrusion forming process in which an alternating current having a frequency equal to or greater than the basic frequency in the regular lighting mode is supplied, the low electric power lighting mode transitioning to a secondary protrusion maintaining process in which a high frequency alternating current having a frequency higher than the basic frequency in the regular lighting mode, and a low frequency alternating current having a frequency lower than the frequency of the high frequency alternating current is alternately supplied.

公开(公告)号：US10021359B2

公开(公告)日：2018-07-10

申请号：US15329338

申请日：2015-07-23

Applicant: USHIO DENKI KABUSHIKI KAISHA

Inventor： Koji Yamada ,  Shigeyoshi Matsumoto

IPC: H04N9/31 ,  G03B21/20

CPC classification number: H04N9/3155 ,  G03B21/2026 ,  G09G3/002 ,  G09G3/34 ,  G09G3/36 ,  G09G2320/0247 ,  H04N9/3179 ,  H05B41/2887 ,  Y02B20/202

Abstract: The discharge lamp lighting device for supplying alternating current to a discharge lamp includes: a power supply control part having a segment signal generation part, a peak value control part, and a frequency control part; and a power supply part. The peak value control part sets a specific segment period, which indicates a value where a value of integral corresponding to a product of the length of the segment period and a peak value set in a segment period is most deviated from an average value of the values of integral within the specific period, to a period other than a final segment period positioned at the final end of the specific period, among a plurality of segment periods belonging to the specific period.