Title:
点灯回路およびそれを備えた光源装置
Document Type and Number:
Japanese Patent JP5502411
Kind Code:
B2
Abstract:
An LED driving circuit includes a dimming control value detection circuit adapted to detect a dimming control value which indicates a ratio of the actual current to be supplied from a current source to the driving circuit during a predetermined time period with respect to a rated current. A control circuit is adapted to regulate the amount of current supplied to one or more LEDs during the predetermined time period to either of the dimming control value squared or the dimming control value cubed times the rated current. The characteristic of light output to the amount of current supplied from the current source during a predetermined time period is therefore made approximate to that of an incandescent bulb.
Inventors:
Minoru Maehara
Application Number:
JP2009221602A
Publication Date:
May 28, 2014
Filing Date:
September 25, 2009
Export Citation:
Assignee:
Panasonic Corporation
International Classes:
H05B37/02
Domestic Patent References:
| JP2005129512A | ||||
| JP50007859B1 |
Attorney, Agent or Firm:
Keisei Nishikawa