JP5225919B2 - Led駆動回路 - Google Patents
Led駆動回路 Download PDFInfo
- Publication number
- JP5225919B2 JP5225919B2 JP2009092813A JP2009092813A JP5225919B2 JP 5225919 B2 JP5225919 B2 JP 5225919B2 JP 2009092813 A JP2009092813 A JP 2009092813A JP 2009092813 A JP2009092813 A JP 2009092813A JP 5225919 B2 JP5225919 B2 JP 5225919B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- switching regulator
- current detection
- led
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Led Devices (AREA)
- Control Of Electrical Variables (AREA)
Description
2A、2B スイッチングレギュレータIC
10 LED
13A、13B 電流検出回路
23 電圧設定回路
24 バイアス回路
Claims (2)
- 電源入力端子に入力される電源電圧よりも耐圧の低いスイッチングレギュレータICを有し、前記スイッチングレギュレータICによって制御される出力電流でLEDを駆動するLED駆動回路であって、
前記電源電圧を前記スイッチングレギュレータICの動作電圧にクランプする電圧クランプ回路と、
前記LEDに流れる電流を検出し、前記スイッチングレギュレータICの動作電圧の範囲内の電圧に変換した電圧を出力する電流検出回路と、を備え
前記スイッチングレギュレータICは、一方の電源端子を同極の前記電源入力端子に接続され、他方の電源端子を前記電圧クランプ回路の出力端子に接続され、フィードバック電圧入力端子を前記電流検出回路の出力端子と接続され、
前記電流検出回路は、電流検出抵抗と、前記電流検出抵抗の両端にベースとエミッタを接続したバイポーラトランジスタと、前記バイポーラトランジスタのコレクタに接続した電圧設定回路と、前記バイポーラトランジスタのベースに接続したバイアス回路とを備えた
ことを特徴とするLED駆動回路。 - 前記電圧設定回路は、
前記電圧設定回路の出力端子と前記バイポーラトランジスタのコレクタの間に直列に接続した第1抵抗及び第2抵抗と、
前記第1抵抗及び第2抵抗の接続端子と前記電圧クランプ回路の出力端子の間に接続されたダイオードと、を備えた
ことを特徴とする請求項1に記載のLED駆動回路。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/417,460 US8115422B2 (en) | 2008-04-08 | 2009-04-02 | LED drive circuit |
US12/417460 | 2009-04-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2010245322A JP2010245322A (ja) | 2010-10-28 |
JP5225919B2 true JP5225919B2 (ja) | 2013-07-03 |
Family
ID=43127088
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2009092813A Expired - Fee Related JP5225919B2 (ja) | 2009-04-02 | 2009-04-07 | Led駆動回路 |
Country Status (1)
Country | Link |
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JP (1) | JP5225919B2 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101876455B1 (ko) | 2011-11-07 | 2018-07-11 | 삼성디스플레이 주식회사 | Dc-dc 컨버터 및 이를 포함하는 발광 다이오드 구동 장치 |
CN209250230U (zh) * | 2018-11-06 | 2019-08-13 | 苏州赛芯电子科技有限公司 | 提高抗尖峰电压能力的单晶圆电池保护电路及充放电电路 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5818214A (en) * | 1996-01-18 | 1998-10-06 | International Rectifier Corporation | Buck regulator circuit |
JPH1168161A (ja) * | 1997-08-15 | 1999-03-09 | Digital Electron Corp | 発光装置 |
JP2004330819A (ja) * | 2003-05-01 | 2004-11-25 | Koito Mfg Co Ltd | 車両用灯具 |
JP4601558B2 (ja) * | 2006-02-03 | 2010-12-22 | 株式会社小糸製作所 | 車両用発光装置 |
-
2009
- 2009-04-07 JP JP2009092813A patent/JP5225919B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP2010245322A (ja) | 2010-10-28 |
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