WO2008060469A3 - Methods and apparatus for controlling series-connected leds - Google Patents

Methods and apparatus for controlling series-connected leds Download PDF

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Publication number
WO2008060469A3
WO2008060469A3 PCT/US2007/023651 US2007023651W WO2008060469A3 WO 2008060469 A3 WO2008060469 A3 WO 2008060469A3 US 2007023651 W US2007023651 W US 2007023651W WO 2008060469 A3 WO2008060469 A3 WO 2008060469A3
Authority
WO
WIPO (PCT)
Prior art keywords
series
leds
led
operating voltage
methods
Prior art date
Application number
PCT/US2007/023651
Other languages
French (fr)
Other versions
WO2008060469A2 (en
Inventor
Ihor A Lys
Original Assignee
Philips Solid State Lighting
Ihor A Lys
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 Philips Solid State Lighting, Ihor A Lys filed Critical Philips Solid State Lighting
Priority to EP07840007A priority Critical patent/EP2082621B1/en
Priority to KR1020097011892A priority patent/KR101460004B1/en
Priority to DE602007007804T priority patent/DE602007007804D1/en
Priority to CN200780041888.1A priority patent/CN101617565B/en
Priority to JP2009536318A priority patent/JP5366815B2/en
Priority to AT07840007T priority patent/ATE474438T1/en
Publication of WO2008060469A2 publication Critical patent/WO2008060469A2/en
Publication of WO2008060469A3 publication Critical patent/WO2008060469A3/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]
    • H05B45/40—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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

Methods and apparatus for controlling series-connected LEDs. Two or more LEDs are connected in series between a first node and a second node, wherein a series current flows between the nodes when an operating voltage is applied across the nodes. One or more controllable current paths are connected in parallel with at least a first LED for at least partially diverting the series current around at least the first LED. A controller monitors at least one parameter representative of the operating voltage, determines a maximum number of the series-connected LEDs that can be energized by the operating voltage, and controls the controllable current path(s) so as to increase an amount of the series current that is diverted around at least the first LED when the maximum number is less than a total number of all of the LEDs connected in series. In one example, the foregoing may be implemented as an integrated circuit package to provide a lighting apparatus suitable for automotive applications.
PCT/US2007/023651 2006-11-10 2007-11-09 Methods and apparatus for controlling series-connected leds WO2008060469A2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP07840007A EP2082621B1 (en) 2006-11-10 2007-11-09 Methods and apparatus for controlling series-connected leds
KR1020097011892A KR101460004B1 (en) 2006-11-10 2007-11-09 Methods and apparatus for controlling series-connected leds
DE602007007804T DE602007007804D1 (en) 2006-11-10 2007-11-09 METHOD AND DEVICE FOR CONTROLLING REAR-OPERATED LED
CN200780041888.1A CN101617565B (en) 2006-11-10 2007-11-09 Methods and apparatus for controlling series-connected leds
JP2009536318A JP5366815B2 (en) 2006-11-10 2007-11-09 Method and apparatus for controlling LEDs connected in series
AT07840007T ATE474438T1 (en) 2006-11-10 2007-11-09 METHOD AND DEVICE FOR CONTROLLING SERIES-CONNECTED LEDS

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US86535306P 2006-11-10 2006-11-10
US60/865,353 2006-11-10
US88362607P 2007-01-05 2007-01-05
US60/883,626 2007-01-05
US95630907P 2007-08-16 2007-08-16
US60/956,309 2007-08-16

Publications (2)

Publication Number Publication Date
WO2008060469A2 WO2008060469A2 (en) 2008-05-22
WO2008060469A3 true WO2008060469A3 (en) 2008-10-02

Family

ID=39333124

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/023651 WO2008060469A2 (en) 2006-11-10 2007-11-09 Methods and apparatus for controlling series-connected leds

Country Status (7)

Country Link
US (1) US7781979B2 (en)
EP (1) EP2082621B1 (en)
JP (2) JP5366815B2 (en)
KR (1) KR101460004B1 (en)
AT (1) ATE474438T1 (en)
DE (1) DE602007007804D1 (en)
WO (1) WO2008060469A2 (en)

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