发明授权
- 专利标题: High pressure discharge lamp ballast and light source apparatus
- 专利标题(中): 高压放电灯镇流器和光源设备
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申请号: US12936413申请日: 2009-03-18
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公开(公告)号: US08482217B2公开(公告)日: 2013-07-09
- 发明人: Tooru Nagase , Yoshiaki Komatsu , Shinichi Suzuki , Makoto Ohkahara , Hirokazu Harasawa , Yoshiaki Kuroda
- 申请人: Tooru Nagase , Yoshiaki Komatsu , Shinichi Suzuki , Makoto Ohkahara , Hirokazu Harasawa , Yoshiaki Kuroda
- 申请人地址: JP Chuo-ku, Tokyo
- 专利权人: Iwasaki Electric Co., Ltd.
- 当前专利权人: Iwasaki Electric Co., Ltd.
- 当前专利权人地址: JP Chuo-ku, Tokyo
- 代理机构: Robinson Intellectual Property Law Office, P.C.
- 代理商 Eric J. Robinson
- 优先权: JP2008-100142 20080408
- 国际申请: PCT/JP2009/055260 WO 20090318
- 国际公布: WO2009/125660 WO 20091015
- 主分类号: H05B41/36
- IPC分类号: H05B41/36
摘要:
The high pressure discharge lamp ballast drives a high pressure discharge lamp with a synthesized-waveform alternating current made of multiple frequency components, the high pressure discharge lamp having a pair of electrodes disposed to face each other. The ballast controls a ratio of the multiple frequency components per unit time; applies a synthesized-waveform current in accordance with the ratio to the high pressure discharge lamp; and detects a lamp parameter of the high pressure discharge lamp. The control circuit is configured to shift the ratio to a first ratio when the lamp parameter is in a first state, and shifts the ratio to a second ratio when the lamp parameter is in a second state. The control circuit changes the ratio stepwise when the ratio is shifted from the first ratio to the second ratio, or when the ratio is shifted from the second ratio to the first ratio.