发明授权
- 专利标题: Dimming apparatus for fluorescent lamps
- 专利标题(中): 荧光灯调光装置
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申请号: US381690申请日: 1999-09-23
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公开(公告)号: US6133697A公开(公告)日: 2000-10-17
- 发明人: Satoshi Nagai , Kenichiro Nishi , Takahisa Hamaguchi , Kentaro Eguchi , Jun Bunya , Osamu Ishikawa
- 申请人: Satoshi Nagai , Kenichiro Nishi , Takahisa Hamaguchi , Kentaro Eguchi , Jun Bunya , Osamu Ishikawa
- 申请人地址: JPX Tokyo JPX Kamakura
- 专利权人: Mitsubishi Denki Kabushiki Kaisha,Mitsubishi Lighting Fixture Co., Ltd.
- 当前专利权人: Mitsubishi Denki Kabushiki Kaisha,Mitsubishi Lighting Fixture Co., Ltd.
- 当前专利权人地址: JPX Tokyo JPX Kamakura
- 主分类号: H05B41/392
- IPC分类号: H05B41/392 ; G05F1/00
摘要:
The present invention is to provide a fluorescent lamp dimming apparatus capable of continuously dimming the fluorescent lamp, and capable of eliminating a fluctuation of light outputs, and in particular, capable of turning ON the fluorescent lamp in a low temperature. The fluorescent lamp dimming apparatus is comprised of a lamp voltage detecting circuit for detecting a discharge voltage of the fluorescent lamp, and a control unit intermittently controls the output frequency of a high frequency power supply in such a manner that the output frequency becomes higher than a dimming frequency based on the dimming signal so as to periodically change a current supplied to the fluorescent lamp into a low current; and when the output frequency of the high frequency power supply becomes higher than the dimming frequency, the control unit sets a lower limit dimming set value based upon a detection voltage of the lamp voltage detecting circuit in order that the output frequency of the high frequency power supply is controlled to become lower than, or equal to the upper limit frequency in accordance with the lower limit dimming set value.