Invention Grant
- Patent Title: High pressure discharge lamp ballast and light source apparatus
- Patent Title (中): 高压放电灯镇流器和光源设备
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Application No.: US12936480Application Date: 2009-03-18
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Publication No.: US08461772B2Publication Date: 2013-06-11
- Inventor: Tooru Nagase , Yoshiaki Komatsu , Shinichi Suzuki , Makoto Ohkahara , Hirokazu Harasawa , Yoshiaki Kuroda
- Applicant: Tooru Nagase , Yoshiaki Komatsu , Shinichi Suzuki , Makoto Ohkahara , Hirokazu Harasawa , Yoshiaki Kuroda
- Applicant Address: JP Chuo-ku, Tokyo
- Assignee: Iwasaki Electric Co., Ltd
- Current Assignee: Iwasaki Electric Co., Ltd
- Current Assignee Address: JP Chuo-ku, Tokyo
- Agency: Robinson Intellectual Property Law Office, P.C.
- Agent Eric J. Robinson
- Priority: JP2008-100144 20080408
- International Application: PCT/JP2009/055261 WO 20090318
- International Announcement: WO2009/125661 WO 20091015
- Main IPC: H05B41/36
- IPC: H05B41/36

Abstract:
A high pressure discharge lamp ballast performs driving with a synthesized current waveform comprising a combination of first and second sets of current waveforms. The ballast controls content rates of each of the sets per unit time; detects a rotation synchronization signal for a color wheel; applies a synthesized current waveform in accordance with the synchronization signal and the content rates to a high pressure discharge lamp; and detects a lamp voltage. A period of each of the first and second sets equals to one rotation of the color wheel. The number of inversions of the second set is larger than that of the first set. The content rate of the second set is set to RL% when the lamp voltage exceeds a value V, and the content rate of the second set is set to RH% when lamp voltage falls below a value V′.
Public/Granted literature
- US20110025223A1 HIGH PRESSURE DISCHARGE LAMP BALLAST AND LIGHT SOURCE APPARATUS Public/Granted day:2011-02-03
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