EP1411751A3 - Circuit - Google Patents

Circuit Download PDF

Info

Publication number
EP1411751A3
EP1411751A3 EP03103461A EP03103461A EP1411751A3 EP 1411751 A3 EP1411751 A3 EP 1411751A3 EP 03103461 A EP03103461 A EP 03103461A EP 03103461 A EP03103461 A EP 03103461A EP 1411751 A3 EP1411751 A3 EP 1411751A3
Authority
EP
European Patent Office
Prior art keywords
green
red
driving
leds
duty cycles
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.)
Granted
Application number
EP03103461A
Other languages
German (de)
French (fr)
Other versions
EP1411751A2 (en
EP1411751B1 (en
Inventor
Jozef P. E. De Krijger
Armand B. Perduijn
Engbert B. G. Hijhof
Marcel J. M. Bucks
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.)
Lumileds LLC
Original Assignee
Lumileds LLC
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 Lumileds LLC filed Critical Lumileds LLC
Priority to EP03103461A priority Critical patent/EP1411751B1/en
Publication of EP1411751A2 publication Critical patent/EP1411751A2/en
Publication of EP1411751A3 publication Critical patent/EP1411751A3/en
Application granted granted Critical
Publication of EP1411751B1 publication Critical patent/EP1411751B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • 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
    • H05B45/28—Controlling the colour of the light using temperature feedback

Abstract

In a circuit arrangement for driving a LED array comprising red, green and blue LEDs, a control loop is added for limiting the duty cycles of the control signals for driving the red, green and blue LEDs. In case one of the duty cycles reaches the limit value, the reference signals for the red, green and blue light are decreased with the same relative amount. The color point of the light is thereby maintained, even when the efficiency of part of the LEDs decreases.
EP03103461A 2002-10-14 2003-09-19 Control circuit for LEDs Expired - Fee Related EP1411751B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03103461A EP1411751B1 (en) 2002-10-14 2003-09-19 Control circuit for LEDs

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP02079326 2002-10-14
EP02079326 2002-10-14
EP03103461A EP1411751B1 (en) 2002-10-14 2003-09-19 Control circuit for LEDs

Publications (3)

Publication Number Publication Date
EP1411751A2 EP1411751A2 (en) 2004-04-21
EP1411751A3 true EP1411751A3 (en) 2007-04-18
EP1411751B1 EP1411751B1 (en) 2012-05-30

Family

ID=32044338

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03103461A Expired - Fee Related EP1411751B1 (en) 2002-10-14 2003-09-19 Control circuit for LEDs

Country Status (1)

Country Link
EP (1) EP1411751B1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1776844B1 (en) * 2004-07-23 2014-06-25 Koninklijke Philips N.V. System for temperature prioritised colour controlling of a solid-state lighting unit
US8937930B2 (en) 2009-11-19 2015-01-20 Qualcomm, Incorporated Virtual peripheral hub device and system
US20120182939A1 (en) 2011-01-14 2012-07-19 Qualcomm Incorporated Telehealth wireless communication hub and service platform system
CN104272868A (en) 2011-12-05 2015-01-07 高通股份有限公司 Telehealth wireless communication hub device and service platform system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6069676A (en) * 1996-08-02 2000-05-30 Citizen Electronics Co., Ltd. Sequential color display device
US20020070914A1 (en) * 2000-12-12 2002-06-13 Philips Electronics North America Corporation Control and drive circuit arrangement for illumination performance enhancement with LED light sources
WO2002076150A1 (en) * 2001-03-16 2002-09-26 Koninklijke Philips Electronics N.V. Apparatus for controlling a light source
WO2002080625A1 (en) * 2001-03-29 2002-10-10 Koninklijke Philips Electronics N.V. System for rgb based led luminary
WO2003032689A1 (en) * 2001-10-05 2003-04-17 Koninklijke Philips Electronics N.V. Pwm control of led based arrays

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6069676A (en) * 1996-08-02 2000-05-30 Citizen Electronics Co., Ltd. Sequential color display device
US20020070914A1 (en) * 2000-12-12 2002-06-13 Philips Electronics North America Corporation Control and drive circuit arrangement for illumination performance enhancement with LED light sources
WO2002076150A1 (en) * 2001-03-16 2002-09-26 Koninklijke Philips Electronics N.V. Apparatus for controlling a light source
WO2002080625A1 (en) * 2001-03-29 2002-10-10 Koninklijke Philips Electronics N.V. System for rgb based led luminary
WO2003032689A1 (en) * 2001-10-05 2003-04-17 Koninklijke Philips Electronics N.V. Pwm control of led based arrays

Also Published As

Publication number Publication date
EP1411751A2 (en) 2004-04-21
EP1411751B1 (en) 2012-05-30

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