JP5085033B2 - 車両用発光装置 - Google Patents
車両用発光装置 Download PDFInfo
- Publication number
- JP5085033B2 JP5085033B2 JP2005357491A JP2005357491A JP5085033B2 JP 5085033 B2 JP5085033 B2 JP 5085033B2 JP 2005357491 A JP2005357491 A JP 2005357491A JP 2005357491 A JP2005357491 A JP 2005357491A JP 5085033 B2 JP5085033 B2 JP 5085033B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- forward voltage
- terminal
- light source
- reference potential
- 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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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/385—Switched mode power supply [SMPS] using flyback topology
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/20—Responsive to malfunctions or to light source life; for protection
- H05B47/23—Responsive to malfunctions or to light source life; for protection of two or more light sources connected in series
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Landscapes
- Led Devices (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Description
〜VE=+Vfとして、異常検出回路18に出力することができる。
〜VE=+Vfとして、異常検出回路18に出力することができる。
12 スイッチングレギュレータ
14 制御用電源
16、16a〜16e フォワード電圧検出回路
17、17a〜17e フォワード電圧検出回路
18 異常検出回路
20、21、22、24、26、28 マルチチップLED
Claims (4)
- 互いに直列接続された複数の半導体光源と、前記各半導体光源に電源からの電力を供給するスイッチングレギュレータと、前記複数の半導体光源のうち、少なくとも前記電源の基準電位に最も近い位置に配置した第1光源のフォワード電圧及び前記基準電位から2番目に近い位置に配置した第2光源のフォワード電圧を検出するフォワード電圧検出手段と、前記フォワード電圧検出手段の検出値を基に前記各半導体光源の異常を検出する異常検出手段とを備え、前記フォワード電圧検出手段は、前記電源の基準電位を基準として前記第1光源の端子電圧を反転増幅して、前記第1光源のフォワード電圧に対応した電圧を出力する第1反転増幅手段を備えるとともに、前記第1反転増幅手段の出力電圧を演算対象の電圧として入力し、前記演算対象の電圧と前記第2光源の端子電圧との差分を反転増幅する第2反転増幅手段を備えることを特徴とする車両用発光装置。
- 請求項1に記載の車両用発光装置において、前記複数の半導体光源のうち、フォワード電圧の最も小さいものを第1光源としてなることを特徴とする車両用発光装置。
- 請求項1または2に記載の車両用発光装置において、前記基準電位は0Vの接地電位としてなることを特徴とする車両用発光装置。
- 請求項1〜3のいずれか1項に記載の車両用発光装置において、3以上の整数をnとしたとき前記フォワード電圧検出手段は、前記基準電位からn番目に近い位置に配置した第n光源のフォワード電圧をさらに検出し、前記基準電位を基準として第(n―1)光源の端子電圧を反転増幅した出力電圧と第n光源の端子電圧との差分を反転増幅する差分増幅用反転増幅手段を備えることを特徴とする車両用発光装置。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005357491A JP5085033B2 (ja) | 2005-12-12 | 2005-12-12 | 車両用発光装置 |
US11/636,915 US7479743B2 (en) | 2005-12-12 | 2006-12-11 | Vehicle lighting apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005357491A JP5085033B2 (ja) | 2005-12-12 | 2005-12-12 | 車両用発光装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2007165441A JP2007165441A (ja) | 2007-06-28 |
JP5085033B2 true JP5085033B2 (ja) | 2012-11-28 |
Family
ID=38138631
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2005357491A Expired - Fee Related JP5085033B2 (ja) | 2005-12-12 | 2005-12-12 | 車両用発光装置 |
Country Status (2)
Country | Link |
---|---|
US (1) | US7479743B2 (ja) |
JP (1) | JP5085033B2 (ja) |
Families Citing this family (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007161012A (ja) * | 2005-12-12 | 2007-06-28 | Koito Mfg Co Ltd | 車両用発光装置 |
DE102006059355A1 (de) * | 2006-12-15 | 2008-06-19 | Robert Bosch Gmbh | Ansteuerungseinrichtung und Verfahren zum Betrieb wenigstens einer Reihenschaltung von Leuchtdioden |
US7675245B2 (en) * | 2007-01-04 | 2010-03-09 | Allegro Microsystems, Inc. | Electronic circuit for driving a diode load |
WO2008104908A1 (en) * | 2007-02-26 | 2008-09-04 | Philips Intellectual Property & Standards Gmbh | Driving a lighting device |
JP4926784B2 (ja) * | 2007-03-29 | 2012-05-09 | 株式会社小糸製作所 | 発光装置 |
JP2009111035A (ja) * | 2007-10-26 | 2009-05-21 | Panasonic Electric Works Co Ltd | 発光ダイオード駆動装置、発光ダイオード駆動装置を用いた照明装置、車室内用照明装置、車両用照明装置 |
WO2009064682A2 (en) | 2007-11-16 | 2009-05-22 | Allegro Microsystems, Inc. | Electronic circuits for driving series connected light emitting diode strings |
TWM337680U (en) * | 2007-11-22 | 2008-08-01 | Everlight Electronics Co Ltd | Circuit apparatus for LEDs |
JP5006840B2 (ja) * | 2008-05-29 | 2012-08-22 | 三菱電機株式会社 | 発光装置及び照明装置 |
US7999487B2 (en) * | 2008-06-10 | 2011-08-16 | Allegro Microsystems, Inc. | Electronic circuit for driving a diode load with a predetermined average current |
JP5006856B2 (ja) * | 2008-10-07 | 2012-08-22 | 三菱電機株式会社 | 発光装置及び照明装置 |
US20120256550A1 (en) * | 2009-12-22 | 2012-10-11 | Takashi Akiyama | Led driving circuit |
JP5056921B2 (ja) | 2010-08-24 | 2012-10-24 | カシオ計算機株式会社 | 半導体光源装置、半導体光源制御方法及び投影装置 |
US8531131B2 (en) * | 2010-09-22 | 2013-09-10 | Osram Sylvania Inc. | Auto-sensing switching regulator to drive a light source through a current regulator |
CN101982346A (zh) * | 2010-10-25 | 2011-03-02 | 苏州高新区禾云设备设计事务所 | 汽车夜间停车闪光报警电路 |
CN102480820B (zh) * | 2010-11-22 | 2014-07-02 | 唯联工业有限公司 | 照明装置及其控制方法 |
US8692482B2 (en) | 2010-12-13 | 2014-04-08 | Allegro Microsystems, Llc | Circuitry to control a switching regulator |
JP5760171B2 (ja) * | 2010-12-28 | 2015-08-05 | パナソニックIpマネジメント株式会社 | Led点灯装置及びそれを用いた照明器具 |
US8525426B2 (en) * | 2011-01-03 | 2013-09-03 | Welland Industrial Co., Ltd. | Lighting apparatus and controlling method thereof |
EP2487998A1 (en) * | 2011-02-09 | 2012-08-15 | National Semiconductor Corporation | Technique for identifying at least one faulty light emitting diode in a string of light emitting diodes |
US9265104B2 (en) | 2011-07-06 | 2016-02-16 | Allegro Microsystems, Llc | Electronic circuits and techniques for maintaining a consistent power delivered to a load |
US9155156B2 (en) | 2011-07-06 | 2015-10-06 | Allegro Microsystems, Llc | Electronic circuits and techniques for improving a short duty cycle behavior of a DC-DC converter driving a load |
DE102012109724A1 (de) * | 2011-10-18 | 2013-04-18 | Samsung Electronics Co. Ltd. | Leistungsversorgungsvorrichtung und Treibervorrichtung |
DE102012109722A1 (de) * | 2011-10-18 | 2013-04-18 | Samsung Electronics Co. Ltd. | Lichtabgebende Vorrichtung und dieselbe verwendendes LED-Treiberverfahren |
US8957607B2 (en) | 2012-08-22 | 2015-02-17 | Allergo Microsystems, LLC | DC-DC converter using hysteretic control and associated methods |
US9144126B2 (en) | 2012-08-22 | 2015-09-22 | Allegro Microsystems, Llc | LED driver having priority queue to track dominant LED channel |
DE102012218772B3 (de) * | 2012-10-15 | 2014-10-30 | Continental Automotive Gmbh | Verfahren und Einrichtung zur Diagnose eines fehlerhaften Leuchtmittels |
US8994279B2 (en) | 2013-01-29 | 2015-03-31 | Allegro Microsystems, Llc | Method and apparatus to control a DC-DC converter |
CZ305640B6 (cs) * | 2013-01-29 | 2016-01-20 | Varroc Lighting Systems, s.r.o. | Detektor poruchy v řetězci světlo emitujících diod |
JP2013157630A (ja) * | 2013-04-18 | 2013-08-15 | Mitsubishi Electric Corp | 発光素子駆動装置 |
DE102015219901B4 (de) | 2015-10-14 | 2019-09-05 | Continental Automotive Gmbh | Diagnosevorrichtung und Verfahren zum Detektieren eines Defekts von zumindest einer aus mehreren Leuchtdioden |
CN109994924B (zh) * | 2017-12-29 | 2022-09-06 | 深圳光峰科技股份有限公司 | 固态光源驱动装置和投影设备 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1477318A (en) * | 1974-01-29 | 1977-06-22 | Tobias M | Electrical circuit means for use in analogue display and/ or control systems |
US5119224A (en) * | 1989-12-14 | 1992-06-02 | Fiber Options Corporation | Apparatus and method for fiber optics communication with dark current correction |
EP1006506A1 (en) * | 1998-12-03 | 2000-06-07 | Hewlett-Packard Company | Optical vehicle display |
JP2003208993A (ja) * | 2002-01-11 | 2003-07-25 | Toyoda Gosei Co Ltd | Led照明装置 |
JP3690601B2 (ja) * | 2002-04-15 | 2005-08-31 | スミダコーポレーション株式会社 | インバータトランス及びインバータ回路 |
JP2004330819A (ja) * | 2003-05-01 | 2004-11-25 | Koito Mfg Co Ltd | 車両用灯具 |
JP4170924B2 (ja) * | 2004-01-23 | 2008-10-22 | 株式会社小糸製作所 | 車両用灯具 |
JP4148908B2 (ja) * | 2004-02-16 | 2008-09-10 | 株式会社小糸製作所 | 車両用灯具 |
JP4400880B2 (ja) * | 2004-10-05 | 2010-01-20 | 株式会社小糸製作所 | 車両用灯具の点灯制御回路 |
JP4398417B2 (ja) * | 2005-10-19 | 2010-01-13 | 株式会社小糸製作所 | 車両用灯具の点灯制御装置 |
-
2005
- 2005-12-12 JP JP2005357491A patent/JP5085033B2/ja not_active Expired - Fee Related
-
2006
- 2006-12-11 US US11/636,915 patent/US7479743B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US7479743B2 (en) | 2009-01-20 |
JP2007165441A (ja) | 2007-06-28 |
US20070132407A1 (en) | 2007-06-14 |
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