JP4922052B2 - 過電圧保護及びデューティ制御機能を有するled駆動装置 - Google Patents
過電圧保護及びデューティ制御機能を有するled駆動装置 Download PDFInfo
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- JP4922052B2 JP4922052B2 JP2007113133A JP2007113133A JP4922052B2 JP 4922052 B2 JP4922052 B2 JP 4922052B2 JP 2007113133 A JP2007113133 A JP 2007113133A JP 2007113133 A JP2007113133 A JP 2007113133A JP 4922052 B2 JP4922052 B2 JP 4922052B2
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- 238000001514 detection method Methods 0.000 claims description 24
- 230000007423 decrease Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
-
- 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]
- H05B45/10—Controlling the intensity of the light
-
- 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]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
-
- 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]
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Led Devices (AREA)
- Dc-Dc Converters (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Description
電源電圧により動作し、所定の周波数ののこぎり波電圧を生成して出力するRT/CT端子と、前記のこぎり波電圧と比較される比較電圧が入力されるCOMP端子と、前記のこぎり波電圧が前記比較電圧のレベルより高い区間でオフになり、前記のこぎり波電圧が前記比較電圧のレベルより低い区間でオンになるパルス信号を生成して出力する出力端子を有するPWM ICと、
前記PWM ICから出力される前記パルス信号に応じて外部から入力された直流電圧をスイッチングして、前記LEDアレイに駆動電圧として提供するスイッチング部と、
前記LEDアレイの両端電圧に該当する検出電圧を生成する電圧検出部と、
前記検出電圧と既設定の基準電圧とを比較して、その差に相当する第1の誤差電圧を出力する電圧比較部と、
前記誤差電圧が所定のレベル以下の場合、前記PWM ICの前記COMP端子に入力される前記比較電圧を実質的に0Vに設定する比較電圧設定部と、を含むことを特徴とするLED駆動装置を提供する。
22 PWM IC
23 スイッチング部
24 電圧検出部
25 比較電圧設定部
OP1〜OP3 第1〜第3のOPアンプ
Claims (2)
- 互いに電気的に接続した複数のLEDを含むLEDアレイと、
電源電圧により動作し、所定の周波数ののこぎり波電圧を生成して出力するRT/CT端子と、前記のこぎり波電圧と比較される比較電圧が入力されるCOMP端子と、前記のこぎり波電圧が前記比較電圧のレベルより高い区間でオフになり、前記のこぎり波電圧が前記比較電圧のレベルより低い区間でオンになるパルス信号を生成して出力する出力端子を有するPWM ICと、
前記PWM ICから出力される前記パルス信号に応じて外部から入力された直流電圧をスイッチングして、前記LEDアレイに駆動電圧として提供するスイッチング部と、
前記LEDアレイの両端電圧に該当する検出電圧を生成する電圧検出部と、
反転入力端に入力された前記検出電圧と、非反転入力端に入力された基準電圧とを比較して、2つの入力端の差に相当する誤差電圧を出力する第1のOPアンプを含む電圧比較部と、
前記誤差電圧が所定のレベル以下の場合、前記PWM ICの前記COMP端子に入力される前記比較電圧を前記のこぎり波電圧の下限よりも小さいレベルに設定する比較電圧設定部とを含み、
前記比較電圧設定部は、
前記第1のOPアンプの出力端にカソードが接続された第1のダイオードと、
前記電源電圧に一方が接続され、前記第1のダイオードのアノードに他方が接続されたレジスタと、
前記第1のダイオードのアノードに非反転入力端が接続され、非反転入力端と出力端とが電気的に接続されて、非反転入力端の入力電圧と同じレベルの出力を有する第2のOPアンプと、
前記第2のOPアンプの出力端にベースが接続され、前記PWM ICのCOMP端子にエミッタが接続され、接地にコレクタが接続されたPNPトランジスタと
を含むことを特徴とするLED駆動装置。 - 前記LED駆動装置は、外部から入力される線形調光信号(Dimming Signal)又は/及びPWM調光信号に相応するレベルの電圧を非反転入力端に入力され、前記LEDアレイのカソード端から出力される電流に相応するレベルの電圧を反転入力端に入力され、前記2つの入力端に入力される電圧のレベルを比較して、その差に相当する第2の誤差電圧を出力端に出力する第3のOPアンプをさらに含み、
前記比較電圧設定部は、前記第3のOPアンプの出力端にカソードが接続され、前記第1のダイオードのアノードにアノードが接続された第2のダイオードをさらに含むことを特徴とする請求項1に記載のLED駆動装置。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2006-0036900 | 2006-04-24 | ||
KR1020060036900A KR100771780B1 (ko) | 2006-04-24 | 2006-04-24 | 과전압 보호 및 듀티 제어 기능을 갖는 led 구동장치 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2007294969A JP2007294969A (ja) | 2007-11-08 |
JP4922052B2 true JP4922052B2 (ja) | 2012-04-25 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP2007113133A Active JP4922052B2 (ja) | 2006-04-24 | 2007-04-23 | 過電圧保護及びデューティ制御機能を有するled駆動装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US7423389B2 (ja) |
JP (1) | JP4922052B2 (ja) |
KR (1) | KR100771780B1 (ja) |
NL (1) | NL2000605C2 (ja) |
TW (1) | TWI363580B (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101487321B1 (ko) * | 2014-03-13 | 2015-02-04 | 주식회사 이티스 | 엘이디 가로등 조도 자동 조절장치 |
Families Citing this family (55)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI326563B (en) * | 2006-10-18 | 2010-06-21 | Chunghwa Picture Tubes Ltd | Light source driving circuit |
WO2008068682A1 (en) | 2006-12-04 | 2008-06-12 | Nxp B.V. | Electronic device for driving light emitting diodes |
JP2008283033A (ja) * | 2007-05-11 | 2008-11-20 | Ricoh Co Ltd | 駆動回路及びその駆動回路を有する電子機器 |
KR100867551B1 (ko) * | 2007-05-18 | 2008-11-10 | 삼성전기주식회사 | Led 어레이 구동 장치 |
JP2009124027A (ja) * | 2007-11-16 | 2009-06-04 | Sanyo Electric Co Ltd | 発光素子駆動回路及び携帯電話 |
TWI367050B (en) * | 2007-12-12 | 2012-06-21 | Au Optronics Corp | Color control method for led lighting system |
US8118447B2 (en) | 2007-12-20 | 2012-02-21 | Altair Engineering, Inc. | LED lighting apparatus with swivel connection |
US7880404B2 (en) * | 2008-01-25 | 2011-02-01 | Micrel, Inc. | Controlling current through serial LEDs using a low voltage transistor when using a high voltage driver |
US7550934B1 (en) * | 2008-04-02 | 2009-06-23 | Micrel, Inc. | LED driver with fast open circuit protection, short circuit compensation, and rapid brightness control response |
US8360599B2 (en) | 2008-05-23 | 2013-01-29 | Ilumisys, Inc. | Electric shock resistant L.E.D. based light |
US7714520B2 (en) * | 2008-06-15 | 2010-05-11 | Liu da-yi | LED driver circuit capable of adjusting output current |
TWI371989B (en) * | 2008-09-24 | 2012-09-01 | Richtek Technology Corp | Boost driver circuit with fast discharging function |
CN101730331B (zh) * | 2008-10-10 | 2013-03-13 | 立锜科技股份有限公司 | 具有快速放电功能的升压驱动电路 |
US7938562B2 (en) | 2008-10-24 | 2011-05-10 | Altair Engineering, Inc. | Lighting including integral communication apparatus |
US8214084B2 (en) | 2008-10-24 | 2012-07-03 | Ilumisys, Inc. | Integration of LED lighting with building controls |
US8901823B2 (en) | 2008-10-24 | 2014-12-02 | Ilumisys, Inc. | Light and light sensor |
US8653984B2 (en) | 2008-10-24 | 2014-02-18 | Ilumisys, Inc. | Integration of LED lighting control with emergency notification systems |
US8324817B2 (en) | 2008-10-24 | 2012-12-04 | Ilumisys, Inc. | Light and light sensor |
KR101512054B1 (ko) * | 2008-12-08 | 2015-04-14 | 삼성디스플레이 주식회사 | 광원 구동 방법, 이를 수행하기 위한 광원 장치 및 이 광원장치를 포함하는 표시 장치 |
KR101007034B1 (ko) * | 2008-12-26 | 2011-01-12 | 엘지이노텍 주식회사 | 발광 다이오드용 전원 공급 장치 |
US8330381B2 (en) | 2009-05-14 | 2012-12-11 | Ilumisys, Inc. | Electronic circuit for DC conversion of fluorescent lighting ballast |
US8299695B2 (en) | 2009-06-02 | 2012-10-30 | Ilumisys, Inc. | Screw-in LED bulb comprising a base having outwardly projecting nodes |
US8125161B2 (en) | 2009-06-19 | 2012-02-28 | Samsung Electro-Mechanics Co., Ltd. | Light emitting device driving apparatus and method for driving the same |
JP5319772B2 (ja) * | 2009-07-03 | 2013-10-16 | シャープ株式会社 | 液晶表示装置および光源制御方法 |
US20120086628A1 (en) * | 2009-07-03 | 2012-04-12 | Sharp Kabushiki Kaisha | Liquid crystal display device and light source control method |
TW201103357A (en) * | 2009-07-06 | 2011-01-16 | Upec Electronics Corp | Light emitting device with compensation capability |
KR101683877B1 (ko) * | 2009-10-23 | 2016-12-07 | 엘지이노텍 주식회사 | 전원 공급 보호 장치 |
US8247992B2 (en) * | 2010-03-23 | 2012-08-21 | Green Mark Technology Inc. | LED driver circuit |
US8541958B2 (en) | 2010-03-26 | 2013-09-24 | Ilumisys, Inc. | LED light with thermoelectric generator |
WO2011119958A1 (en) | 2010-03-26 | 2011-09-29 | Altair Engineering, Inc. | Inside-out led bulb |
EP2553316B8 (en) | 2010-03-26 | 2015-07-08 | iLumisys, Inc. | Led light tube with dual sided light distribution |
US8454193B2 (en) | 2010-07-08 | 2013-06-04 | Ilumisys, Inc. | Independent modules for LED fluorescent light tube replacement |
EP2593714A2 (en) | 2010-07-12 | 2013-05-22 | iLumisys, Inc. | Circuit board mount for led light tube |
KR101675856B1 (ko) * | 2010-08-31 | 2016-11-15 | 엘지디스플레이 주식회사 | 백 라이트 유닛과 이를 이용한 액정 표시장치 및 그의 구동방법 |
JP5132749B2 (ja) * | 2010-10-07 | 2013-01-30 | 三菱電機株式会社 | 光源点灯装置及び照明器具 |
WO2012058556A2 (en) | 2010-10-29 | 2012-05-03 | Altair Engineering, Inc. | Mechanisms for reducing risk of shock during installation of light tube |
US8870415B2 (en) | 2010-12-09 | 2014-10-28 | Ilumisys, Inc. | LED fluorescent tube replacement light with reduced shock hazard |
WO2013028965A2 (en) | 2011-08-24 | 2013-02-28 | Ilumisys, Inc. | Circuit board mount for led light |
US8884867B2 (en) * | 2011-12-05 | 2014-11-11 | Apple Inc. | Efficient backlight short circuit protection |
WO2013131002A1 (en) | 2012-03-02 | 2013-09-06 | Ilumisys, Inc. | Electrical connector header for an led-based light |
US9163794B2 (en) | 2012-07-06 | 2015-10-20 | Ilumisys, Inc. | Power supply assembly for LED-based light tube |
US9271367B2 (en) | 2012-07-09 | 2016-02-23 | Ilumisys, Inc. | System and method for controlling operation of an LED-based light |
TWI450631B (zh) * | 2012-08-14 | 2014-08-21 | Univ Nat Cheng Kung | 具補償電容組之發光二極體驅動電路 |
KR102103249B1 (ko) | 2013-01-08 | 2020-04-23 | 삼성디스플레이 주식회사 | 백라이트 유닛 및 그것을 포함하는 표시 장치 |
US9285084B2 (en) | 2013-03-14 | 2016-03-15 | Ilumisys, Inc. | Diffusers for LED-based lights |
US9267650B2 (en) | 2013-10-09 | 2016-02-23 | Ilumisys, Inc. | Lens for an LED-based light |
KR20160111975A (ko) | 2014-01-22 | 2016-09-27 | 일루미시스, 인크. | 어드레스된 led들을 갖는 led 기반 조명 |
US9510400B2 (en) | 2014-05-13 | 2016-11-29 | Ilumisys, Inc. | User input systems for an LED-based light |
US10161568B2 (en) | 2015-06-01 | 2018-12-25 | Ilumisys, Inc. | LED-based light with canted outer walls |
KR102342546B1 (ko) | 2015-08-12 | 2021-12-30 | 삼성전자주식회사 | Led 구동 장치, 조명 장치 및 전류 제어 회로 |
CN105407570A (zh) * | 2015-11-24 | 2016-03-16 | 芜湖锐芯电子科技有限公司 | 一种具有驱动升级的led灯具模块 |
FR3046329B1 (fr) * | 2015-12-24 | 2019-12-13 | STMicroelectronics (Alps) SAS | Dispositif de commande d'une diode |
CN105898918A (zh) * | 2016-05-03 | 2016-08-24 | 电子科技大学 | 一种用于线性恒流驱动led的过压保护电路 |
CN111796150B (zh) * | 2019-04-08 | 2023-09-22 | 华润微集成电路(无锡)有限公司 | 占空比检测电路及占空比检测方法 |
CN110536506B (zh) * | 2019-07-26 | 2021-04-02 | 浙江大华技术股份有限公司 | Led频闪爆闪电路 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6023178A (en) * | 1997-04-09 | 2000-02-08 | Yokogawa Electric Corporation | Pulse width control IC circuit and switching power supply unit |
KR100321964B1 (ko) * | 1998-01-05 | 2002-02-02 | 인터내셔널 렉터파이어 코퍼레이션 | 전집적 안정기 집적회로 |
JP3473509B2 (ja) * | 1999-07-16 | 2003-12-08 | 三菱電機株式会社 | スイッチングレギュレータ |
US6657399B2 (en) * | 2001-01-26 | 2003-12-02 | International Rectifier Corporation | Self-oscillating circuit for driving high-side and low-side switching devices with variable width pulses |
US6969959B2 (en) * | 2001-07-06 | 2005-11-29 | Lutron Electronics Co., Inc. | Electronic control systems and methods |
US6643158B2 (en) * | 2001-10-31 | 2003-11-04 | Mobility Electronics, Inc. | Dual input AC/DC to programmable DC output converter |
JP4209730B2 (ja) * | 2003-07-22 | 2009-01-14 | 東光株式会社 | スイッチング定電流電源装置 |
JP2005067457A (ja) * | 2003-08-26 | 2005-03-17 | Denso Corp | 車両用照明制御装置 |
US7061215B2 (en) * | 2003-10-02 | 2006-06-13 | Intersil Americas Inc. | Cascadable current-mode regulator |
JP3600915B1 (ja) | 2003-10-09 | 2004-12-15 | ローム株式会社 | スイッチング電源装置及び表示装置付き電子機器 |
JP4387170B2 (ja) * | 2003-11-27 | 2009-12-16 | 株式会社リコー | スイッチングレギュレータ |
CN100399689C (zh) * | 2004-04-27 | 2008-07-02 | 株式会社理光 | 开关调整器以及开关调整器的输出电压切换方法 |
JP4463635B2 (ja) * | 2004-07-20 | 2010-05-19 | 株式会社リコー | スイッチングレギュレータ、スイッチングレギュレータを使用した電源回路及びスイッチングレギュレータを使用した二次電池の充電回路 |
JP2006049445A (ja) | 2004-08-02 | 2006-02-16 | Nec Access Technica Ltd | ボタン照明点灯回路の制御方法及びボタン照明点灯回路 |
JP2006211762A (ja) * | 2005-01-26 | 2006-08-10 | Sharp Corp | レギュレータ及びこれを備えた電子機器 |
-
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- 2006-04-24 KR KR1020060036900A patent/KR100771780B1/ko active IP Right Grant
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- 2007-04-17 TW TW096113424A patent/TWI363580B/zh active
- 2007-04-23 JP JP2007113133A patent/JP4922052B2/ja active Active
- 2007-04-23 NL NL2000605A patent/NL2000605C2/nl active Search and Examination
- 2007-04-23 US US11/785,953 patent/US7423389B2/en active Active
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KR101487321B1 (ko) * | 2014-03-13 | 2015-02-04 | 주식회사 이티스 | 엘이디 가로등 조도 자동 조절장치 |
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JP2007294969A (ja) | 2007-11-08 |
KR100771780B1 (ko) | 2007-10-30 |
NL2000605C2 (nl) | 2013-01-22 |
US7423389B2 (en) | 2008-09-09 |
KR20070104804A (ko) | 2007-10-29 |
US20070247450A1 (en) | 2007-10-25 |
NL2000605A1 (nl) | 2007-10-25 |
TW200746916A (en) | 2007-12-16 |
TWI363580B (en) | 2012-05-01 |
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