WO2009009573A3 - System and method for regulation of light emitting diodes - Google Patents

System and method for regulation of light emitting diodes Download PDF

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Publication number
WO2009009573A3
WO2009009573A3 PCT/US2008/069496 US2008069496W WO2009009573A3 WO 2009009573 A3 WO2009009573 A3 WO 2009009573A3 US 2008069496 W US2008069496 W US 2008069496W WO 2009009573 A3 WO2009009573 A3 WO 2009009573A3
Authority
WO
WIPO (PCT)
Prior art keywords
light emitting
forward voltage
block
emitting diode
threshold
Prior art date
Application number
PCT/US2008/069496
Other languages
French (fr)
Other versions
WO2009009573A2 (en
Inventor
Hannes Estl
Sanmukh M Patel
Rex M Teggatz
Luthuli E Dake
Original Assignee
Texas Instruments Inc
Hannes Estl
Sanmukh M Patel
Rex M Teggatz
Luthuli E Dake
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 Texas Instruments Inc, Hannes Estl, Sanmukh M Patel, Rex M Teggatz, Luthuli E Dake filed Critical Texas Instruments Inc
Publication of WO2009009573A2 publication Critical patent/WO2009009573A2/en
Publication of WO2009009573A3 publication Critical patent/WO2009009573A3/en

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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]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/18—Controlling the intensity of the light using temperature feedback

Abstract

System and method for regulating light emitting diodes. An embodiment comprises providing a drive current to a light emitting diode (block 320), measuring a forward voltage drop over the light emitting diode (block 355), comparing the forward voltage drop with a threshold (block 360), and altering the drive current in response to a determining that the forward voltage drop is less than the threshold (block 365). Due to a substantially linear relationship between a light emitting diode's forward voltage and its temperature, it is possible to determine if the light emitting diode is overheating by measuring the forward voltage and comparing it with the threshold. The use of the forward voltage eliminates the need for a temperature sensor, thereby reducing system complexity and cost.
PCT/US2008/069496 2007-07-09 2008-07-09 System and method for regulation of light emitting diodes WO2009009573A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US77514007A 2007-07-09 2007-07-09
US11/775,140 2007-07-09

Publications (2)

Publication Number Publication Date
WO2009009573A2 WO2009009573A2 (en) 2009-01-15
WO2009009573A3 true WO2009009573A3 (en) 2009-03-19

Family

ID=40229456

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2008/069496 WO2009009573A2 (en) 2007-07-09 2008-07-09 System and method for regulation of light emitting diodes

Country Status (1)

Country Link
WO (1) WO2009009573A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180033275A1 (en) * 2015-01-27 2018-02-01 The Sociotech Institute (PTY) Ltd An Early Warning Device for Detecting and Reporting Dangerous Conditions in a Community
TWI711337B (en) * 2019-05-07 2020-11-21 益力半導體股份有限公司 Self-adaptive dimming drive system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62163068A (en) * 1986-01-13 1987-07-18 Mitsubishi Electric Corp Led head
US7052180B2 (en) * 2002-01-04 2006-05-30 Kelvin Shih LED junction temperature tester
JP2007109747A (en) * 2005-10-12 2007-04-26 Stanley Electric Co Ltd Led lighting controller

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62163068A (en) * 1986-01-13 1987-07-18 Mitsubishi Electric Corp Led head
US7052180B2 (en) * 2002-01-04 2006-05-30 Kelvin Shih LED junction temperature tester
JP2007109747A (en) * 2005-10-12 2007-04-26 Stanley Electric Co Ltd Led lighting controller

Also Published As

Publication number Publication date
WO2009009573A2 (en) 2009-01-15

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