Title:
LED LIGHT SOURCE DEVICE
Document Type and Number:
Japanese Patent JP2002016290
Kind Code:
A
Abstract:
To provide an LED light source device where color control and light quantity control of an LED can be realized, using a simple circuit constitution and comfortable light adjustment can be made.
An LED load 1 is formed by combining plural LEDs having two or more different luminescent colors and connecting them in reverse parallel. From an AC power source part 2, AC power, having a prescribed lighting frequency, is supplied to the LED load 1 via a switching element 3 performing on/off control at a prescribed frequency and a diode 4 connected in reverse parallel. By the on/off control of the switching element 3, a load current in a forward LED row is controlled, so that the quantity of light and the luminescent color are controlled.
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Inventors:
MITA KAZUTOSHI
SHIMIZU KEIICHI
SASAI TOSHIHIKO
TAKAHASHI YUJI
KAMATA MASAHIKO
MATSUMOTO SHINICHIRO
KOZUKA HIDEO
SHIMIZU KEIICHI
SASAI TOSHIHIKO
TAKAHASHI YUJI
KAMATA MASAHIKO
MATSUMOTO SHINICHIRO
KOZUKA HIDEO
Application Number:
JP2000193971A
Publication Date:
January 18, 2002
Filing Date:
June 28, 2000
Export Citation:
Assignee:
TOSHIBA LIGHTING & TECHNOLOGY
International Classes:
H01L33/00; H02M3/155; H05B37/02; (IPC1-7): H01L33/00; H05B37/02
Attorney, Agent or Firm:
Mitani Kei