DE50102479D1 - CONTROL OF LIGHT-EMITTING DIODES (LED'S) - Google Patents

CONTROL OF LIGHT-EMITTING DIODES (LED'S)

Info

Publication number
DE50102479D1
DE50102479D1 DE50102479T DE50102479T DE50102479D1 DE 50102479 D1 DE50102479 D1 DE 50102479D1 DE 50102479 T DE50102479 T DE 50102479T DE 50102479 T DE50102479 T DE 50102479T DE 50102479 D1 DE50102479 D1 DE 50102479D1
Authority
DE
Germany
Prior art keywords
led
operational amplifier
transistor
output
whose
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.)
Expired - Lifetime
Application number
DE50102479T
Other languages
German (de)
Inventor
Werner Ludorf
Peter Hein
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.)
Tridonic GmbH and Co KG
Original Assignee
Tridonicatco GmbH and Co KG
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 Tridonicatco GmbH and Co KG filed Critical Tridonicatco GmbH and Co KG
Priority to DE50102479T priority Critical patent/DE50102479D1/en
Application granted granted Critical
Publication of DE50102479D1 publication Critical patent/DE50102479D1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Landscapes

  • Led Devices (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Optical Communication System (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The drive circuit has a constant current source with an operational amplifier whose output feeds a transistor. The LED is connected in series with a first output of the transistor, whose second output is fed back to the operational amplifier inverting input. A component on the feedback side of the transistor raises the potential at least by the offset voltage of the operational amplifier if no or only infinitesimal current is flowing in the LED. The drive circuit has a constant current source with an operational amplifier (OP) whose output fees a transistor control connection. The LED (LED1) is connected in series with a first output connection of the transistor, whose second output connection is fed back to the operational amplifier inverting input. A component on the feedback side of the transistor raises the potential at least by the offset voltage of the operational amplifier if no or only infinitesimal; current is flowing in the LED.
DE50102479T 2000-03-17 2001-03-08 CONTROL OF LIGHT-EMITTING DIODES (LED'S) Expired - Lifetime DE50102479D1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE50102479T DE50102479D1 (en) 2000-03-17 2001-03-08 CONTROL OF LIGHT-EMITTING DIODES (LED'S)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10013208A DE10013208A1 (en) 2000-03-17 2000-03-17 Control of light-emitting diodes (leds)
DE50102479T DE50102479D1 (en) 2000-03-17 2001-03-08 CONTROL OF LIGHT-EMITTING DIODES (LED'S)
PCT/EP2001/002639 WO2001069979A1 (en) 2000-03-17 2001-03-08 Control of light-emitting diodes (leds)

Publications (1)

Publication Number Publication Date
DE50102479D1 true DE50102479D1 (en) 2004-07-08

Family

ID=7635237

Family Applications (2)

Application Number Title Priority Date Filing Date
DE10013208A Withdrawn DE10013208A1 (en) 2000-03-17 2000-03-17 Control of light-emitting diodes (leds)
DE50102479T Expired - Lifetime DE50102479D1 (en) 2000-03-17 2001-03-08 CONTROL OF LIGHT-EMITTING DIODES (LED'S)

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DE10013208A Withdrawn DE10013208A1 (en) 2000-03-17 2000-03-17 Control of light-emitting diodes (leds)

Country Status (5)

Country Link
EP (1) EP1269798B1 (en)
AT (1) ATE268538T1 (en)
AU (1) AU2001248339A1 (en)
DE (2) DE10013208A1 (en)
WO (1) WO2001069979A1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002231470A (en) * 2001-02-05 2002-08-16 Pioneer Electronic Corp Light emitting diode driving circuit
US6596977B2 (en) * 2001-10-05 2003-07-22 Koninklijke Philips Electronics N.V. Average light sensing for PWM control of RGB LED based white light luminaries
JP2004235498A (en) * 2003-01-31 2004-08-19 Anden Light emitting diode controller
US8791644B2 (en) 2005-03-29 2014-07-29 Linear Technology Corporation Offset correction circuit for voltage-controlled current source
KR101311140B1 (en) * 2005-03-29 2013-09-25 리니어 테크놀러지 코포레이션 Offset correction circuit for voltage-controlled current source
FR2884639A1 (en) 2005-04-14 2006-10-20 Thomson Licensing Sa ACTIVE MATRIX IMAGE DISPLAY PANEL, THE TRANSMITTERS OF WHICH ARE POWERED BY POWER-DRIVEN POWER CURRENT GENERATORS
TWI455645B (en) 2006-12-08 2014-10-01 Koninkl Philips Electronics Nv Light source, luminaire, and luminaire system
TWI487430B (en) 2008-01-15 2015-06-01 皇家飛利浦電子股份有限公司 A light source
DE102009044058A1 (en) * 2009-09-18 2011-03-31 Müller, Dietmar Dimmable fairy lights and switches for this

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63305837A (en) * 1987-06-05 1988-12-13 Katsuyuki Miyasaka Electronic apparatus
US6016038A (en) * 1997-08-26 2000-01-18 Color Kinetics, Inc. Multicolored LED lighting method and apparatus
JPH11214183A (en) * 1998-01-22 1999-08-06 Hochiki Corp Light emitting circuit

Also Published As

Publication number Publication date
EP1269798B1 (en) 2004-06-02
EP1269798A1 (en) 2003-01-02
AU2001248339A1 (en) 2001-09-24
DE10013208A1 (en) 2001-09-20
WO2001069979A1 (en) 2001-09-20
ATE268538T1 (en) 2004-06-15

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: TRIDONIC GMBH & CO KG, DORNBIRN, AT