Title:
照明装置
Document Type and Number:
Japanese Patent JP6765463
Kind Code:
B2
Abstract:
A lighting device whose power conversion efficiency is improved by suppression of fluctuation in luminance of a light-emitting element and deterioration of the light-emitting element due to a change in temperature and a change over time and whose power consumption is reduced is provided. The disclosed invention is a lighting device that has a function of correcting a change in temperature and a change over time and includes at least one switching regulator in a driver portion. Constant current drive is performed on light-emitting elements and monitor light-emitting elements are used, so that highly-efficient output voltage which is corrected to have an optimal level is applied to the light-emitting elements and stable drive is performed for a long time. Power conversion efficiency is improved by a switching regulator, so that the total power consumption of the lighting device is reduced.
Inventors:
Kei Takahashi
Application Number:
JP2019022825A
Publication Date:
October 07, 2020
Filing Date:
February 12, 2019
Export Citation:
Assignee:
Semiconductor Energy Laboratory Co., Ltd.
International Classes:
H05B45/38; H05B45/345; H05B45/375
Domestic Patent References:
| JP2006343531A | ||||
| JP2007005259A |
Foreign References:
| US20100127636 |