发明授权
- 专利标题: Lighting apparatus for discharge lamp
- 专利标题(中): 放电灯照明装置
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申请号: US11223538申请日: 2005-09-09
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公开(公告)号: US07196912B2公开(公告)日: 2007-03-27
- 发明人: Shinji Ohta , Tomoyuki Ichikawa
- 申请人: Shinji Ohta , Tomoyuki Ichikawa
- 申请人地址: JP Tokyo
- 专利权人: Koito Manufacturing Co., Ltd.
- 当前专利权人: Koito Manufacturing Co., Ltd.
- 当前专利权人地址: JP Tokyo
- 代理机构: Fish & Richardson P.C.
- 优先权: JPP.2004-264032 20040910
- 主分类号: H02M3/335
- IPC分类号: H02M3/335
摘要:
In a lighting apparatus for a discharge lamp, a mask signal against a re-arc voltage is correctly generated to detect a lamp voltage accurately in view of a support to high frequency lighting such that the detection of the lamp voltage is not affected by the re-arc voltage. The lighting apparatus for the discharge lamp comprises a DC-AC converter for receiving an input voltage from a DC power supply to convert the input voltage to an AC voltage; detecting means for detecting a lamp voltage associated with a discharge lamp or a lamp voltage and a lamp current; and a signal generator circuit for generating a mask signal for excluding a re-arc voltage, which occurs at the time the polarity is inverted, from items to be detected, in the event of a detection of the lamp voltage. The signal generator circuit detects the lamp voltage or lamp current or a voltage at an output stage of the DC-AC converter to correctly capture a polarity inversion timing to generate a mask signal against the re-arc voltage. A timing shift of the mask signal can be limited within an allowable range even if the discharge lamp is lit at a high frequency.
公开/授权文献
- US20060055346A1 Lighting apparatus for discharge lamp 公开/授权日:2006-03-16