DE602005009317D1 - Circuit and method for monitoring the temperature of a light emitting diode - Google Patents

Circuit and method for monitoring the temperature of a light emitting diode

Info

Publication number
DE602005009317D1
DE602005009317D1 DE602005009317T DE602005009317T DE602005009317D1 DE 602005009317 D1 DE602005009317 D1 DE 602005009317D1 DE 602005009317 T DE602005009317 T DE 602005009317T DE 602005009317 T DE602005009317 T DE 602005009317T DE 602005009317 D1 DE602005009317 D1 DE 602005009317D1
Authority
DE
Germany
Prior art keywords
light emitting
emitting diode
temperature
constant
monitoring
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
Application number
DE602005009317T
Other languages
German (de)
Inventor
Gunnar Klinghult
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Mobile Communications AB
Original Assignee
Sony Ericsson Mobile Communications AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sony Ericsson Mobile Communications AB filed Critical Sony Ericsson Mobile Communications AB
Publication of DE602005009317D1 publication Critical patent/DE602005009317D1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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]
    • H05B45/20—Controlling the colour of the light
    • H05B45/22—Controlling the colour of the light using optical feedback
    • 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
    • H05B45/12—Controlling the intensity of the light using optical feedback
    • 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
    • H05B45/56—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving measures to prevent abnormal temperature of the LEDs
    • 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

Landscapes

  • Led Devices (AREA)

Abstract

The present invention discloses an electric circuit 1 and method for monitoring a temperature of a light emitting diode 2. The inventive electric circuit 1 for monitoring a temperature of a light emitting diode 2 in a constant-current mode comprises a driver circuit 3 for supplying a predefined constant-current to the light emitting diode 2 to run the light emitting diode 2 in said constant-current mode, a storage 4 for storing a general dependency between a forward voltage of the light emitting diode 2 in said constant-current mode and the temperature of the light emitting diode 2, a voltage sensor 5 for measuring the actual forward voltage of the light emitting diode 2 in said constant-current mode and a calculator 6 for calculating the actual temperature of the light emitting diode 2 by using the detected general dependency and the measured actual forward voltage.
DE602005009317T 2005-03-08 2005-03-08 Circuit and method for monitoring the temperature of a light emitting diode Expired - Fee Related DE602005009317D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05005054A EP1701589B1 (en) 2005-03-08 2005-03-08 Electric circuit and method for monitoring a temperature of a light emitting diode

Publications (1)

Publication Number Publication Date
DE602005009317D1 true DE602005009317D1 (en) 2008-10-09

Family

ID=34934130

Family Applications (1)

Application Number Title Priority Date Filing Date
DE602005009317T Expired - Fee Related DE602005009317D1 (en) 2005-03-08 2005-03-08 Circuit and method for monitoring the temperature of a light emitting diode

Country Status (3)

Country Link
EP (1) EP1701589B1 (en)
AT (1) ATE406783T1 (en)
DE (1) DE602005009317D1 (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006033233A1 (en) * 2006-07-18 2008-01-24 Austriamicrosystems Ag Light emitting diode operating method involves determining temperature of diode representing temperature signal by measuring and evaluating flux voltage of diode in activated operating condition for lighting or signaling purposes
CN101675709B (en) * 2007-04-20 2011-10-05 皇家飞利浦电子股份有限公司 Lighting device with a led used for sensing
US7822086B2 (en) 2007-07-27 2010-10-26 Microvision, Inc. Laser projection temperature compensation
US9326346B2 (en) 2009-01-13 2016-04-26 Terralux, Inc. Method and device for remote sensing and control of LED lights
US8358085B2 (en) 2009-01-13 2013-01-22 Terralux, Inc. Method and device for remote sensing and control of LED lights
CN103025337B (en) 2009-11-17 2014-10-15 特锐拉克斯有限公司 LED power-supply detection and control
CA2810026A1 (en) 2010-09-16 2012-03-22 Terralux, Inc. Communication with lighting units over a power bus
US9596738B2 (en) 2010-09-16 2017-03-14 Terralux, Inc. Communication with lighting units over a power bus
US8896231B2 (en) 2011-12-16 2014-11-25 Terralux, Inc. Systems and methods of applying bleed circuits in LED lamps
US8664865B2 (en) * 2012-03-27 2014-03-04 General Electric Company Lighting system having an OLED light sensor
US9265119B2 (en) 2013-06-17 2016-02-16 Terralux, Inc. Systems and methods for providing thermal fold-back to LED lights
CN105701938B (en) * 2016-04-25 2018-01-02 成都益英光电科技有限公司 The survey thing direction-finding system and its detection method of multiple diode illuminator
CN105701940B (en) * 2016-04-25 2017-11-21 成都益英光电科技有限公司 The survey thing system and its method of discrimination of movement direction of object can be differentiated
CN105844826B (en) * 2016-04-25 2017-11-21 成都益英光电科技有限公司 Utilize the survey thing system and its detection method of LED lighting body
EP3655818B1 (en) 2017-07-21 2021-12-15 Lumileds LLC Method of controlling a segmented flash system
JP7440287B2 (en) * 2020-02-05 2024-02-28 アズビル株式会社 measuring device

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8200517A (en) * 1982-02-11 1983-09-01 Tno ADJUSTING CIRCUIT FOR LIGHT EMITTING DIODE WITH TEMPERATURE COMPENSATION.
JPH01257383A (en) * 1988-03-01 1989-10-13 Matsushita Electric Ind Co Ltd Semiconductor laser driving circuit
GB2224374A (en) * 1988-08-24 1990-05-02 Plessey Co Plc Temperature control of light-emitting devices
JPH0689453A (en) * 1992-09-09 1994-03-29 Sony Corp Optical disk recording device
GB2288907A (en) * 1994-04-27 1995-11-01 Thomson Consumer Electronics Combined light emitting diode and photodiode
JPH08128953A (en) * 1994-10-28 1996-05-21 Shimadzu Corp Oil deterioration degree detecting device
US20040052076A1 (en) * 1997-08-26 2004-03-18 Mueller George G. Controlled lighting methods and apparatus
JP3960630B2 (en) * 1998-02-06 2007-08-15 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Organic electroluminescence device
DE19912463A1 (en) * 1999-03-19 2000-09-28 Sensor Line Ges Fuer Optoelekt Process for stabilizing the optical output power of light-emitting diodes and laser diodes
DE19917239A1 (en) * 1999-04-16 2000-10-26 Hella Kg Hueck & Co Method for determining correction factors to compensate for the temperature drift of the beam intensity of an LED
US6724158B1 (en) * 2002-10-28 2004-04-20 Honeywell International Inc. Power linearization technique for controlling the luminance of light emitting display devices

Also Published As

Publication number Publication date
EP1701589A1 (en) 2006-09-13
ATE406783T1 (en) 2008-09-15
EP1701589B1 (en) 2008-08-27

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee