Title:
蛍光ランプの調光装置
Document Type and Number:
Japanese Patent JP4162053
Kind Code:
B2
Abstract:
The dimmer has a lamp voltage detection circuit for detecting a discharge voltage of the fluorescent lamp, and causes a control section to carry out intermittent frequency control so that an output frequency of a high frequency power source is changed from a dimming frequency based on a dimming signal to a frequency higher than the dimming frequency. Thus a current to the fluorescent lamp is changed to be a periodically low current. Also, when the output frequency of the power source is a frequency higher than the dimming frequency, causes the control section to determine a lower limit preset value of dimming based on the voltage detected by the lamp voltage detection circuit. The output frequency of the power source is thereby controlled to be lower than the upper limit frequency corresponding to the lower limit preset value of dimming.
Inventors:
Toshimi Nagai
Kenichiro Nishi
Takehisa Hamaguchi
Kentaro Eguchi
Jun Fumiya
Ishikawa attack
Kenichiro Nishi
Takehisa Hamaguchi
Kentaro Eguchi
Jun Fumiya
Ishikawa attack
Application Number:
JP52365899A
Publication Date:
October 08, 2008
Filing Date:
May 11, 1998
Export Citation:
Assignee:
Mitsubishi Electric Corporation
Mitsubishi Electric Lighting Co., Ltd.
Mitsubishi Electric Lighting Co., Ltd.
International Classes:
H05B41/392
Domestic Patent References:
| JP5283189A | ||||
| JP5135894A | ||||
| JP6267687A |
Attorney, Agent or Firm:
Michiharu Soga
Hidetoshi Furukawa
Suzuki Kenchi
Kajinami order
Kazuhiro Oyaku
Shunichi Ueda
Hidetoshi Furukawa
Suzuki Kenchi
Kajinami order
Kazuhiro Oyaku
Shunichi Ueda