Title:
照明装置及び照明システム
Document Type and Number:
Japanese Patent JP6685005
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a lighting device and a lighting system capable of suppressing power loss when dimming a light source.SOLUTION: A lighting device 10 comprises: a light source 1; a constant current circuit 2 which is electrically connected in series to the light source 1 and controls a current If such that a current value of the current If flowing to the light source 1 may be a specified value; and a voltage detection circuit 4 which detects a DC voltage V2. A series circuit of the light source 1 and the constant current circuit 2 is configured such that the DC voltage V2 is applied thereto. The constant current circuit 2 is configured such that the current value of the current If flowing to the light source 1 decreases as a voltage value of the DC voltage V2 detected by the voltage detection circuit 4 increases.SELECTED DRAWING: Figure 1
Inventors:
Kenichi Fukuda
Hiroshi Konishi
Masashi Motomura
Hiroshi Konishi
Masashi Motomura
Application Number:
JP2015247696A
Publication Date:
April 22, 2020
Filing Date:
December 18, 2015
Export Citation:
Assignee:
Panasonic IP Management Co., Ltd.
International Classes:
H05B45/00
Domestic Patent References:
| JP2013105713A | ||||
| JP2014060877A | ||||
| JP2010165546A |
Attorney, Agent or Firm:
Patent business corporation Hokuto patent office
Keisei Nishikawa
Takeshi Sakaguchi
Hidetoshi Kitade
Nakaishi Haruki
Keisei Nishikawa
Takeshi Sakaguchi
Hidetoshi Kitade
Nakaishi Haruki