Title:
LIGHTING DEVICE, LUMINAIRE, AND CONTROL METHOD FOR LIGHTING DEVICE
Document Type and Number:
Japanese Patent JP2018098179
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a lighting device in which a dropper circuit enabling an extremely smooth fade operation is used, and in which heat generation in the dropper circuit is suppressed and the occurrence of a flicker is also suppressed even at a low dimming level.SOLUTION: A lighting device 10 includes: a variable voltage source 15; a transistor Q2 which controls a current flowing through a light-emitting element 5; and a control circuit 16 which controls the transistor Q2 such that a current corresponding to a received instruction for a dimming level passes through the light-emitting element 5. When the received instruction instructs a predetermined dimming level or higher, the control circuit 16 controls the variable voltage source 15 such that a voltage drop in the transistor Q2 becomes a first voltage, and when the received instruction instructs a dimming level less than the predetermined dimming level, the control circuit controls the variable voltage source 15 such that the voltage drop in the transistor Q2 becomes a second voltage higher than the first voltage.SELECTED DRAWING: Figure 1
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Inventors:
MURAKAMI SHINICHI
KUMADA KAZUHIRO
HAYASHI RYUHEI
KUMADA KAZUHIRO
HAYASHI RYUHEI
Application Number:
JP2017183723A
Publication Date:
June 21, 2018
Filing Date:
September 25, 2017
Export Citation:
Assignee:
PANASONIC IP MAN CORP
International Classes:
H05B37/02; H05B44/00
Domestic Patent References:
| JP2016146278A | 2016-08-12 |
Attorney, Agent or Firm:
Hiromori Arai
Eisaku Teratani
Shinichi Michisaka
Eisaku Teratani
Shinichi Michisaka