JP2007004995A - Led点灯装置 - Google Patents
Led点灯装置 Download PDFInfo
- Publication number
- JP2007004995A JP2007004995A JP2005180239A JP2005180239A JP2007004995A JP 2007004995 A JP2007004995 A JP 2007004995A JP 2005180239 A JP2005180239 A JP 2005180239A JP 2005180239 A JP2005180239 A JP 2005180239A JP 2007004995 A JP2007004995 A JP 2007004995A
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- Prior art keywords
- led
- voltage
- output
- leds
- current
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- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
Abstract
【解決手段】本発明のLED点灯装置は、LED2と、LED2に電力を供給すると共に、その際LED2に流れる出力電流Ioに応じてLED2への印加電圧としての出力電圧Voを調整するして点灯させる点灯ユニット5とを備えたものである。このようにすると、点灯ユニット5に接続されたLED2の個数に応じてLED2への出力電圧Voが最適な値に調整されるため、発熱や損失の問題となる定電流素子3を設けなくても定電流制御が可能となり、消費電力をLED2の個数に応じた最小限の値にすることができる。
【選択図】 図1
Description
5 点灯ユニット(点灯制御部)
Claims (1)
- LEDと、このLEDに電力を供給して点灯させる点灯制御部とを備えたLED点灯装置であって、前記点灯制御部は、前記LEDに流れる電流に応じて前記LEDへの印加電圧を調整するものであることを特徴とするLED点灯装置。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005180239A JP2007004995A (ja) | 2005-06-21 | 2005-06-21 | Led点灯装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005180239A JP2007004995A (ja) | 2005-06-21 | 2005-06-21 | Led点灯装置 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2008160951A Division JP4971254B2 (ja) | 2008-06-19 | 2008-06-19 | Led点灯装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2007004995A true JP2007004995A (ja) | 2007-01-11 |
Family
ID=37690423
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2005180239A Pending JP2007004995A (ja) | 2005-06-21 | 2005-06-21 | Led点灯装置 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2007004995A (ja) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008269947A (ja) * | 2007-04-20 | 2008-11-06 | Hitachi Displays Ltd | 液晶表示装置 |
US8018207B2 (en) | 2007-09-12 | 2011-09-13 | Ricoh Company, Ltd. | Switching regulator |
US8294434B2 (en) | 2007-09-12 | 2012-10-23 | Ricoh Company, Ltd. | Constant current output control type switching regulator |
US8294433B2 (en) | 2007-09-12 | 2012-10-23 | Ricoh Company, Ltd. | Constant current supply type of switching regulator |
JP2013070622A (ja) * | 2013-01-22 | 2013-04-18 | Ricoh Co Ltd | 定電流出力制御型スイッチングレギュレータ |
US8760139B2 (en) | 2011-09-13 | 2014-06-24 | Ricoh Company, Ltd. | DC-DC converter control circuit and DC-DC converter including same |
US8766615B2 (en) | 2011-09-13 | 2014-07-01 | Ricoh Company, Ltd. | DC-DC converter control circuit and DC-DC converter including same |
-
2005
- 2005-06-21 JP JP2005180239A patent/JP2007004995A/ja active Pending
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008269947A (ja) * | 2007-04-20 | 2008-11-06 | Hitachi Displays Ltd | 液晶表示装置 |
JP4542116B2 (ja) * | 2007-04-20 | 2010-09-08 | 株式会社 日立ディスプレイズ | 液晶表示装置 |
US8525952B2 (en) | 2007-04-20 | 2013-09-03 | Hitachi Displays, Ltd. | Liquid crystal display device |
US8922736B2 (en) | 2007-04-20 | 2014-12-30 | Japan Display Inc. | Liquid crystal display device |
US8018207B2 (en) | 2007-09-12 | 2011-09-13 | Ricoh Company, Ltd. | Switching regulator |
US8294434B2 (en) | 2007-09-12 | 2012-10-23 | Ricoh Company, Ltd. | Constant current output control type switching regulator |
US8294433B2 (en) | 2007-09-12 | 2012-10-23 | Ricoh Company, Ltd. | Constant current supply type of switching regulator |
US8760139B2 (en) | 2011-09-13 | 2014-06-24 | Ricoh Company, Ltd. | DC-DC converter control circuit and DC-DC converter including same |
US8766615B2 (en) | 2011-09-13 | 2014-07-01 | Ricoh Company, Ltd. | DC-DC converter control circuit and DC-DC converter including same |
JP2013070622A (ja) * | 2013-01-22 | 2013-04-18 | Ricoh Co Ltd | 定電流出力制御型スイッチングレギュレータ |
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