WO2009040705A3 - Method and apparatus for light intensity control with drive current modulation - Google Patents

Method and apparatus for light intensity control with drive current modulation Download PDF

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Publication number
WO2009040705A3
WO2009040705A3 PCT/IB2008/053783 IB2008053783W WO2009040705A3 WO 2009040705 A3 WO2009040705 A3 WO 2009040705A3 IB 2008053783 W IB2008053783 W IB 2008053783W WO 2009040705 A3 WO2009040705 A3 WO 2009040705A3
Authority
WO
WIPO (PCT)
Prior art keywords
array
modification signal
light intensity
drive current
intensity control
Prior art date
Application number
PCT/IB2008/053783
Other languages
French (fr)
Other versions
WO2009040705A2 (en
Inventor
Ian Ashdown
Original Assignee
Tir Technology Lp
Koninkl Philips Electronics Nv
Ian Ashdown
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 Tir Technology Lp, Koninkl Philips Electronics Nv, Ian Ashdown filed Critical Tir Technology Lp
Publication of WO2009040705A2 publication Critical patent/WO2009040705A2/en
Publication of WO2009040705A3 publication Critical patent/WO2009040705A3/en

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]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)

Abstract

Disclosed are a method and apparatus for optical feedback control for a lighting unit (10) for generating light having a desired luminous flux and chromaticity. The control signals (110, 210) for the drive currents of each array of one or more light sources are independently configured using a suitable modification signal (111, 211) for each array. In this manner, upon detection of the output light of the arrays, which will have encoded therein a respective modification signal, a controller can be configured to separate each array's contribution based on the respective modification signal. The modification signal can be configured to modulate the pulse widths of drive currents supplied to each array.
PCT/IB2008/053783 2007-09-28 2008-09-17 Method and apparatus for light intensity control with drive current modulation WO2009040705A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US97608607P 2007-09-28 2007-09-28
US60/976,086 2007-09-28

Publications (2)

Publication Number Publication Date
WO2009040705A2 WO2009040705A2 (en) 2009-04-02
WO2009040705A3 true WO2009040705A3 (en) 2009-06-25

Family

ID=40511966

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2008/053783 WO2009040705A2 (en) 2007-09-28 2008-09-17 Method and apparatus for light intensity control with drive current modulation

Country Status (1)

Country Link
WO (1) WO2009040705A2 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009090511A2 (en) * 2008-01-17 2009-07-23 Koninklijke Philips Electronics N.V. Method and apparatus for light intensity control
US20120127210A1 (en) * 2010-11-19 2012-05-24 Au Optronics Corporation Random PWM Dimming Control for LED Backlight
GB2500929A (en) * 2012-04-05 2013-10-09 Integration Technology Ltd LED illumination method and apparatus
US9022602B2 (en) * 2012-08-28 2015-05-05 Osram Sylvania Inc. Modular multichannel connector system and method
EP2904879B1 (en) * 2012-10-05 2020-01-08 Signify Holding B.V. A method of self-calibrating a lighting device and a lighting device performing the method
DE102013016386A1 (en) * 2013-09-30 2015-04-02 Elmos Semiconductor Aktiengesellschaft Apparatus and method for setting multi-colored light scenes in motor vehicles
EP3367880B1 (en) * 2015-10-27 2019-07-24 Teknologian tutkimuskeskus VTT Oy Method and system for retina imaging
US10963410B2 (en) 2018-05-08 2021-03-30 Apple Inc. Data bus driver with electrical energy dump
WO2021050397A1 (en) * 2019-09-10 2021-03-18 Hatch Transformers, Inc. Methods and apparatuses for dimming a constant-voltage output led driver

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004057923A1 (en) * 2002-12-20 2004-07-08 Koninklijke Philips Electronics N.V. Sensing light emitted from multiple light sources
EP1447951A2 (en) * 2003-01-17 2004-08-18 Free Systems Pte. Ltd. Removal of intersymbol interference from pulse position modulated signals
EP1635617A2 (en) * 2004-09-10 2006-03-15 Agilent Technologies Inc. (a Delaware Corporation) Methods and apparatus for regulating the drive currents of a plurality of light emitters
WO2007095740A1 (en) * 2006-02-23 2007-08-30 Tir Technology Lp System and method for light source identification
WO2007121574A1 (en) * 2006-04-21 2007-11-01 Tir Technology Lp Method and apparatus for light intensity control

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6211626B1 (en) 1997-08-26 2001-04-03 Color Kinetics, Incorporated Illumination components
US6016038A (en) 1997-08-26 2000-01-18 Color Kinetics, Inc. Multicolored LED lighting method and apparatus
ATE552652T1 (en) 2004-10-12 2012-04-15 Koninkl Philips Electronics Nv OPERATING DEVICE AND METHOD WITH HIGHER RESOLUTION FOR OPERATION WITH MODULATED LIGHT SOURCES
CA2643257A1 (en) 2006-03-14 2007-09-20 Tir Technology Lp Apparatus and method for controlling activation of an electronic device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004057923A1 (en) * 2002-12-20 2004-07-08 Koninklijke Philips Electronics N.V. Sensing light emitted from multiple light sources
EP1447951A2 (en) * 2003-01-17 2004-08-18 Free Systems Pte. Ltd. Removal of intersymbol interference from pulse position modulated signals
EP1635617A2 (en) * 2004-09-10 2006-03-15 Agilent Technologies Inc. (a Delaware Corporation) Methods and apparatus for regulating the drive currents of a plurality of light emitters
WO2007095740A1 (en) * 2006-02-23 2007-08-30 Tir Technology Lp System and method for light source identification
WO2007121574A1 (en) * 2006-04-21 2007-11-01 Tir Technology Lp Method and apparatus for light intensity control

Also Published As

Publication number Publication date
WO2009040705A2 (en) 2009-04-02

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