Title:
LED DRIVE CIRCUIT
Document Type and Number:
Japanese Patent JP2009200257
Kind Code:
A
Abstract:
To provide a LED drive circuit capable of controlling light, preventing an electric current of a fixed amount or larger from flowing to a LED in the case that a supply voltage fluctuates and so forth, and improving efficiency.
A LED drive circuit is provided with: a constant current circuit B21 for supplying a constant current to a LED module 3 to drive the LED module 3; a thyristor 4; and a phase-angle control circuit A11 for adjusting the firing angle of the thyristor 4. In the LED drive circuit, the LED module 3, the constant current circuit B21 and the thyristor 4 are connected in series.
Inventors:
MARUYAMA YASUHIRO
Application Number:
JP2008040440A
Publication Date:
September 03, 2009
Filing Date:
February 21, 2008
Export Citation:
Assignee:
SHARP KK
International Classes:
H01L33/00; H05B37/02
Domestic Patent References:
| JP2006270007A | 2006-10-05 | |||
| JP2003249686A | 2003-09-05 | |||
| JP2000260578A | 2000-09-22 | |||
| JPH103321A | 1998-01-06 | |||
| JP2003059335A | 2003-02-28 | |||
| JPH11307815A | 1999-11-05 |
Attorney, Agent or Firm:
Shizuo Sano
Inoue On
Kazutoshi Shibuya
Inoue On
Kazutoshi Shibuya
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