EP1583399A3 - Array of light emitting diodes - Google Patents

Array of light emitting diodes Download PDF

Info

Publication number
EP1583399A3
EP1583399A3 EP05251845A EP05251845A EP1583399A3 EP 1583399 A3 EP1583399 A3 EP 1583399A3 EP 05251845 A EP05251845 A EP 05251845A EP 05251845 A EP05251845 A EP 05251845A EP 1583399 A3 EP1583399 A3 EP 1583399A3
Authority
EP
European Patent Office
Prior art keywords
leds
array
light emitting
emitting diodes
strings
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.)
Withdrawn
Application number
EP05251845A
Other languages
German (de)
French (fr)
Other versions
EP1583399A2 (en
Inventor
Brian Christopher Latham
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.)
Oxley Developments Co Ltd
Original Assignee
Oxley Developments Co Ltd
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 Oxley Developments Co Ltd filed Critical Oxley Developments Co Ltd
Publication of EP1583399A2 publication Critical patent/EP1583399A2/en
Publication of EP1583399A3 publication Critical patent/EP1583399A3/en
Withdrawn legal-status Critical Current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]
    • H05B45/30—Driver circuits
    • H05B45/395—Linear regulators
    • 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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • 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
    • H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
    • 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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • 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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices

Abstract

The invention concerns LED arrays of the type in which one or more "strings" of LEDs such as 6 are series connected across a potential difference as at 8, 10. To compensate for changes in forward voltage of individual LEDs 4, and/or for supply voltage variations, a switching means (which may be formed as a transistor T2, T3) is provided for selectively removing one or more LEDs from the strings. This can for example be done by selectively shorting the chosen LEDs.
EP05251845A 2004-04-03 2005-03-24 Array of light emitting diodes Withdrawn EP1583399A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0407574 2004-04-03
GBGB0407574.3A GB0407574D0 (en) 2004-04-03 2004-04-03 Method and drive circuit for controlling leds

Publications (2)

Publication Number Publication Date
EP1583399A2 EP1583399A2 (en) 2005-10-05
EP1583399A3 true EP1583399A3 (en) 2006-10-04

Family

ID=32247799

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05251845A Withdrawn EP1583399A3 (en) 2004-04-03 2005-03-24 Array of light emitting diodes

Country Status (2)

Country Link
EP (1) EP1583399A3 (en)
GB (1) GB0407574D0 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5188690B2 (en) * 2006-08-29 2013-04-24 アバゴ・テクノロジーズ・イーシービーユー・アイピー（シンガポール）プライベート・リミテッド Apparatus and method for driving an LED
DE102007006438B4 (en) * 2007-02-05 2014-12-11 Marc ALBRECHT Circuit for the simultaneous activation of an arrangement of similar consumers
DE102007063879B3 (en) * 2007-08-30 2016-08-18 Osram Gmbh Arrangement, use and method for driving light-emitting components
DE102007041131B4 (en) * 2007-08-30 2015-07-23 Osram Gmbh Arrangement, use and method for driving light-emitting components
CN102458004A (en) * 2010-10-20 2012-05-16 凯杰照明股份有限公司 Self-adjusting method of driving circuit of LED light fixture

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2758551A1 (en) * 1977-12-23 1979-06-28 Elmeg LED control circuitry information display - consists of parallel circuits of LEDs and bridging transistors coupled in series
DE3832109A1 (en) * 1988-09-21 1990-03-22 Juergen Munz Luminaire
DE20101418U1 (en) * 2001-01-26 2001-05-17 Insta Elektro Gmbh & Co Kg Circuit arrangement for operating several lamps
US20010033503A1 (en) * 2000-03-28 2001-10-25 Hamp Charles Henry Low power lighting system with LED illumination
DE10131845A1 (en) * 2001-06-30 2003-01-23 Hella Kg Hueck & Co Voltage supply circuit for LEDs in motor vehicle has switches for bridging series resistances depending on supply voltage and/or on current flowing through LED branches
EP1318701A2 (en) * 2001-12-05 2003-06-11 Audi Ag Apparatus and method for driving a plurality of Leds
US20030164809A1 (en) * 2002-03-01 2003-09-04 Wa-Hing Leung Solid state lighting array driving circuit

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2758551A1 (en) * 1977-12-23 1979-06-28 Elmeg LED control circuitry information display - consists of parallel circuits of LEDs and bridging transistors coupled in series
DE3832109A1 (en) * 1988-09-21 1990-03-22 Juergen Munz Luminaire
US20010033503A1 (en) * 2000-03-28 2001-10-25 Hamp Charles Henry Low power lighting system with LED illumination
DE20101418U1 (en) * 2001-01-26 2001-05-17 Insta Elektro Gmbh & Co Kg Circuit arrangement for operating several lamps
DE10131845A1 (en) * 2001-06-30 2003-01-23 Hella Kg Hueck & Co Voltage supply circuit for LEDs in motor vehicle has switches for bridging series resistances depending on supply voltage and/or on current flowing through LED branches
EP1318701A2 (en) * 2001-12-05 2003-06-11 Audi Ag Apparatus and method for driving a plurality of Leds
US20030164809A1 (en) * 2002-03-01 2003-09-04 Wa-Hing Leung Solid state lighting array driving circuit

Also Published As

Publication number Publication date
EP1583399A2 (en) 2005-10-05
GB0407574D0 (en) 2004-05-05

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