EP1079667A3 - Lighting control device - Google Patents

Lighting control device Download PDF

Info

Publication number
EP1079667A3
EP1079667A3 EP00306085A EP00306085A EP1079667A3 EP 1079667 A3 EP1079667 A3 EP 1079667A3 EP 00306085 A EP00306085 A EP 00306085A EP 00306085 A EP00306085 A EP 00306085A EP 1079667 A3 EP1079667 A3 EP 1079667A3
Authority
EP
European Patent Office
Prior art keywords
chains
wleds
chain
current
control means
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
EP00306085A
Other languages
German (de)
French (fr)
Other versions
EP1079667B1 (en
EP1079667A2 (en
Inventor
Charles Henry Hurst Willis
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.)
Schott AG
Original Assignee
Schott Fibre Optics UK 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
Priority claimed from GBGB9919608.1A external-priority patent/GB9919608D0/en
Priority claimed from GBGB9927366.6A external-priority patent/GB9927366D0/en
Priority claimed from GB0000168A external-priority patent/GB0000168D0/en
Application filed by Schott Fibre Optics UK Ltd filed Critical Schott Fibre Optics UK Ltd
Publication of EP1079667A2 publication Critical patent/EP1079667A2/en
Publication of EP1079667A3 publication Critical patent/EP1079667A3/en
Application granted granted Critical
Publication of EP1079667B1 publication Critical patent/EP1079667B1/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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/54—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a series array of LEDs
    • 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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/56—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving measures to prevent abnormal temperature of the LEDs
    • 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
    • H05B45/345—Current stabilisation; Maintaining constant current

Abstract

A lighting device and control means therefor is disclosed. The lighting device consists of a plurality of White LEDs (WLEDs) provided in separate chains all connected parallel. A small number of WLEDs is connected in series in each chain, and a number of such chains are wired together in parallel between a pair of voltage lines from which current is drawn. Current measurement and adjusting means is provided firstly between a high voltage line and all the parallely connected chains, and secondly in each chain. Each current measurement and adjusting means is controlled ideally by a microprocessor which monitors both the total current drawn by all the chains together and also the individual currents flowing in each chain. WLEDs have a tendency to fail when subjected to sudden current increases, and also when operating at extreme temperatures as temperature affects the operating characteristics of diodes in general. It cannot however accurately be predicted whether a particular WLED will fail in open or closed circuit and the invention provides a means of mitigating the effect of failure of one WLED on those which remain functioning in the circuit. The control means immediately increases or reduces the total current flow to all the chains depending on whether a WLEDs fails in short or open circuit. The control means also detects operating temperature and user light intensity requirement and adjusts various currents accordingly. <IMAGE>
EP00306085A 1999-08-19 2000-07-17 Lighting control device Expired - Lifetime EP1079667B1 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
GBGB9919608.1A GB9919608D0 (en) 1999-08-19 1999-08-19 Lighting control device
GB9919608 1999-08-19
GB9927366 1999-11-20
GBGB9927366.6A GB9927366D0 (en) 1999-11-20 1999-11-20 Lighting control device
GB0000168A GB0000168D0 (en) 2000-01-06 2000-01-06 Lighting control device
GB0000168 2000-01-06

Publications (3)

Publication Number Publication Date
EP1079667A2 EP1079667A2 (en) 2001-02-28
EP1079667A3 true EP1079667A3 (en) 2003-11-12
EP1079667B1 EP1079667B1 (en) 2006-09-06

Family

ID=27255454

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00306085A Expired - Lifetime EP1079667B1 (en) 1999-08-19 2000-07-17 Lighting control device

Country Status (4)

Country Link
EP (1) EP1079667B1 (en)
AT (1) ATE339077T1 (en)
DE (1) DE60030516T2 (en)
ES (1) ES2265871T3 (en)

Families Citing this family (29)

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Publication number Priority date Publication date Assignee Title
DE10017878A1 (en) * 2000-04-11 2001-10-25 Hella Kg Hueck & Co Control device for a lamp of a motor vehicle provided with a number of light-emitting diodes
US7262752B2 (en) 2001-01-16 2007-08-28 Visteon Global Technologies, Inc. Series led backlight control circuit
DE10121380A1 (en) * 2001-05-02 2002-12-19 Garufo Gmbh Monitoring of LED type displays to ensure they are operating correctly, e.g. for signal displays used with railway switching and control, by monitoring the current drawn by individual display units and the whole unit
EP1286571A3 (en) * 2001-05-02 2005-03-30 Garufo GmbH Electronically secured power supply for a circuit group and display for variable information
TWI235349B (en) * 2001-11-26 2005-07-01 Osram Opto Semiconductors Gmbh Circuit-arrangement for an LED-array
WO2003061347A1 (en) * 2002-01-19 2003-07-24 Stührenberg GmbH Signal light comprising light-emitting diodes
DE10324609B4 (en) * 2003-05-30 2014-11-13 Osram Gmbh Control circuit and LED array and method for operating an LED array
GB0402974D0 (en) 2004-02-11 2004-03-17 Bhagat Peter Apparatus for the control of lighting and associated methods
DE102004034359B3 (en) * 2004-07-13 2006-02-23 Siemens Ag Circuit to operate a light signal for rail safety with parallel light diode chains has constant current source connected to a circuit element through a control reference voltage
JP4400880B2 (en) * 2004-10-05 2010-01-20 株式会社小糸製作所 Lighting control circuit for vehicular lamp
EP1684001A1 (en) * 2005-01-20 2006-07-26 Christian Niederberger Lighting device
JP4398411B2 (en) * 2005-07-12 2010-01-13 株式会社小糸製作所 Lighting control device for vehicle lamp
DE102005046583A1 (en) 2005-09-28 2007-03-29 Eppendorf Ag Real-time polymerase chain reaction device, has monitoring device with electrical device for examining electrical function of light emitting diodes, where monitoring device generates signals when determining malfunction of diodes
DE102006000810B4 (en) * 2006-01-03 2007-10-04 Vossloh-Schwabe Optoelectronic Gmbh & Co. Kg Interconnected arrangement of at least one LED chip having individual modules
US7414370B2 (en) * 2006-02-03 2008-08-19 Honeywell International Inc. Increasing reliability of operation of light emitting diode arrays at higher operating temperatures and its use in the lamps of automobiles
DE102006028074A1 (en) 2006-06-19 2007-12-20 Münchner Hybrid Systemtechnik GmbH Light system has distributor, coupling element with voltage supply, multiple illuminants, which are connected to distributor and coupling element and controllable power source with light emitting diode
US7675245B2 (en) * 2007-01-04 2010-03-09 Allegro Microsystems, Inc. Electronic circuit for driving a diode load
US7876103B2 (en) * 2007-02-27 2011-01-25 GE Lighting Solutions, LLC LED chain failure detection
KR101614304B1 (en) 2007-11-16 2016-04-21 알레그로 마이크로시스템스, 엘엘씨 Electronic circuits for driving series connected light emitting diode strings
US7999487B2 (en) 2008-06-10 2011-08-16 Allegro Microsystems, Inc. Electronic circuit for driving a diode load with a predetermined average current
DE102009018428A1 (en) * 2009-04-22 2010-10-28 Vishay Electronic Gmbh Circuit for a light-emitting diode arrangement and light-emitting diode module
US8692482B2 (en) 2010-12-13 2014-04-08 Allegro Microsystems, Llc Circuitry to control a switching regulator
US9155156B2 (en) 2011-07-06 2015-10-06 Allegro Microsystems, Llc Electronic circuits and techniques for improving a short duty cycle behavior of a DC-DC converter driving a load
US9265104B2 (en) 2011-07-06 2016-02-16 Allegro Microsystems, Llc Electronic circuits and techniques for maintaining a consistent power delivered to a load
US9144126B2 (en) 2012-08-22 2015-09-22 Allegro Microsystems, Llc LED driver having priority queue to track dominant LED channel
US8957607B2 (en) 2012-08-22 2015-02-17 Allergo Microsystems, LLC DC-DC converter using hysteretic control and associated methods
US8994279B2 (en) 2013-01-29 2015-03-31 Allegro Microsystems, Llc Method and apparatus to control a DC-DC converter
US20150173135A1 (en) * 2013-12-17 2015-06-18 Liteideas, Llc System and method of variable resistance led lighting circuit
RU203675U1 (en) * 2021-01-27 2021-04-15 Евгений Николаевич Коптяев LED LAMP

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2631102A1 (en) * 1988-05-09 1989-11-10 Cit Alcatel Lamp with light-emitting diodes
DE9002812U1 (en) * 1990-02-13 1990-06-07 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De
EP0716485A1 (en) * 1994-12-05 1996-06-12 Hughes Aircraft Company Diode drive current source
US5663719A (en) * 1993-04-29 1997-09-02 Electro-Tech's LED traffic signal light with automatic low-line voltage compensating circuit
GB2317241A (en) * 1996-09-12 1998-03-18 Schott Fibre Optics Fibre optic cable passanger seat lighting
US5783909A (en) * 1997-01-10 1998-07-21 Relume Corporation Maintaining LED luminous intensity
WO1998049872A1 (en) * 1997-04-30 1998-11-05 Signal House Limited Traffic signals
WO1998053646A1 (en) * 1997-05-22 1998-11-26 Schmidt Gregory W An illumination device using pulse width modulation of a led
WO1998059015A1 (en) * 1997-06-20 1998-12-30 The Regents Of The University Of California University Of California At San Diego Highly emissive white phosphor compounds
US5884125A (en) * 1996-03-25 1999-03-16 Sharp Kabushiki Kaisha Light emitting element control device, optical sensor control device and blank lamp control device

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2631102A1 (en) * 1988-05-09 1989-11-10 Cit Alcatel Lamp with light-emitting diodes
DE9002812U1 (en) * 1990-02-13 1990-06-07 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De
US5663719A (en) * 1993-04-29 1997-09-02 Electro-Tech's LED traffic signal light with automatic low-line voltage compensating circuit
EP0716485A1 (en) * 1994-12-05 1996-06-12 Hughes Aircraft Company Diode drive current source
US5884125A (en) * 1996-03-25 1999-03-16 Sharp Kabushiki Kaisha Light emitting element control device, optical sensor control device and blank lamp control device
GB2317241A (en) * 1996-09-12 1998-03-18 Schott Fibre Optics Fibre optic cable passanger seat lighting
US5783909A (en) * 1997-01-10 1998-07-21 Relume Corporation Maintaining LED luminous intensity
WO1998049872A1 (en) * 1997-04-30 1998-11-05 Signal House Limited Traffic signals
WO1998053646A1 (en) * 1997-05-22 1998-11-26 Schmidt Gregory W An illumination device using pulse width modulation of a led
WO1998059015A1 (en) * 1997-06-20 1998-12-30 The Regents Of The University Of California University Of California At San Diego Highly emissive white phosphor compounds

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SHERMAN L: "LOGIC POWER DRIVES HIGH-INTENSITY LEDS", ELECTRONIC DESIGN, PENTON PUBLISHING, CLEVELAND, OH, US, vol. 45, no. 23, 23 October 1997 (1997-10-23), pages 142,144, XP000752929, ISSN: 0013-4872 *

Also Published As

Publication number Publication date
DE60030516D1 (en) 2006-10-19
ATE339077T1 (en) 2006-09-15
DE60030516T2 (en) 2007-06-06
EP1079667B1 (en) 2006-09-06
EP1079667A2 (en) 2001-02-28
ES2265871T3 (en) 2007-03-01

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