LED DRIVE CIRCUIT - CITIZEN HOLDINGS CO LTD

Title:

LED DRIVE CIRCUIT

Document Type and Number:

WIPO Patent Application WO/2011/077909

Kind Code:

A1

Abstract:

Disclosed is an LED drive circuit, which is low cost, small, and capable of efficiently eliminating a through current between a plurality of LED groups. The LED drive circuit has: a rectifier; a first LED group that includes a plurality of LEDs; a second LED group that includes a plurality of LEDs; a connecting unit, which connects the first and the second LED groups to the rectifier in series, or connects the first and the second LED groups to the rectifier in parallel; a control unit, which controls the connecting unit, and switches the connection of the first and the second LED groups to the rectifier from the parallel connection to the series connection; and a diode, which is disposed between the first LED group and the second LED group, and which eliminates the reverse direction current.

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Inventors:

AKIYAMA TAKASHI (JP)

Application Number:

PCT/JP2010/071420

Publication Date:

June 30, 2011

Filing Date:

November 24, 2010

Export Citation:

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Assignee:

CITIZEN HOLDINGS CO LTD (JP)
CITIZEN ELECTRONICS (JP)
AKIYAMA TAKASHI (JP)

International Classes:

H01L33/00

Foreign References:

JP2009283775A	2009-12-03
JP2004114968A	2004-04-15
JP2007173548A	2007-07-05
JP2009272088A	2009-11-19

Attorney, Agent or Firm:

AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)

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