EP1079667A2 - Vorrichtung zur Beleuchtungssteuerung - Google Patents

Vorrichtung zur Beleuchtungssteuerung Download PDF

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Publication number
EP1079667A2
EP1079667A2 EP00306085A EP00306085A EP1079667A2 EP 1079667 A2 EP1079667 A2 EP 1079667A2 EP 00306085 A EP00306085 A EP 00306085A EP 00306085 A EP00306085 A EP 00306085A EP 1079667 A2 EP1079667 A2 EP 1079667A2
Authority
EP
European Patent Office
Prior art keywords
wleds
current
chains
control means
lighting device
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
English (en)
French (fr)
Other versions
EP1079667B1 (de
EP1079667A3 (de
Inventor
Paul Dr. c/o Schott Fibre Optics Timson (UK)Ltd
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/de
Publication of EP1079667A3 publication Critical patent/EP1079667A3/de
Application granted granted Critical
Publication of EP1079667B1 publication Critical patent/EP1079667B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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]
    • H05B45/50—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

Definitions

  • This invention relates to a lighting control device, and more specifically to a control device adapted for use in conjunction with arrays of white light emitting diodes, hereinafter referred to as WLEDs.
  • WLEDs white light emitting diodes
  • the invention hereinafter described has particular application in the field of dedicated aircraft seat lighting, as WLEDs are beginning to replace the fibre optic lighting systems which are currently in widespread use.
  • WLED clusters can be used in any environment where there is a requirement to illuminate a particular and discreet area, and where there is furthermore a requirement for user flexibility and versatility inasmuch as the lighting arrangement must be capable of adopting a number, and perhaps an infinite number of positions and orientations with respect to its mounting. Such lighting arrangements are most ideally suited to providing reading lighting to the occupant of a seat.
  • British Patent Application No. 2317421 describes a modular aircraft seat lighting arrangement comprising a plurality of fibre optic cables, ends of which are grouped together in a so-called common end which is illuminated by a high intensity light source, the alternate ends known as fibre optic tails being used to transfer light from the light source to a plurality of different locations.
  • the individual fibre optic cables which connect the tails and the common ends are often bulky and cumbersome, and are thus integrally disposed within or underneath the seats for which they are adapted to provide illumination.
  • This arrangement does represent a significant advance over the conventional aircraft seat lighting arrangement in which individual lights are personal lights are incorporated in a mass-produced console unit above each passenger seat on the aircraft, because the fibre optic tails can be sheathed in a flex and stay type member and thus the occupant of a seat can move the tail to any desired position.
  • the fibre optic seat lighting arrangement has a number of disadvantages in that the apparatus is bulky, and when it is considered that modern aircraft have seats arranged in banks of three and a lighting arrangement would generally be provided within or underneath each bank of seats, it can be appreciated that the increase in overall weight of the aircraft is significant, especially in longer haul and thus larger aircraft which may have seating for over 400 passengers.
  • a further disadvantage of the fibre optic lighting arrangement is its power consumption, which is relatively high on account of the requirement to power the high intensity lights which illuminate the common ends of the cables.
  • WLEDs have also been previously impeded by the electronic and physical sensitivity of such components.
  • WLEDs are highly temperature and current sensitive devices, and a slight increase in the operating temperature or electric current being passed can dramatically reduce the life expectancy of the device.
  • diodes being semi-conductor devices have complex temperature dependent resistance, and thus Voltage and Current characteristics.
  • a further difficulty associated with the provision of uniform intensity light with WLEDs is that the voltage supplies on aircraft and within vehicles are often non-uniform.
  • the electrical sensitivity of WLEDs and their increased likelihood of failure during the occasional power surges which may be experienced gives rise to the need for some form of compensation to ensure that the working life of the WLEDs is prolonged as much as possible.
  • a lighting device comprising a cluster of WLEDs at least some of which are chained in parallel between a pair of lines which apply a voltage across the WLEDs chains, each of said chains having at least one WLED therein, characterised in that first current altering means and second and further current altering means are also provided between the lines, said first current altering means being capable of adjusting the total current drawn from the voltage lines by the chained WLEDs and the second and further current altering means being provided in at least one of the chains to adjust the particular current through said chain.
  • primary current measuring means are also provided between the voltage lines and the chains which measure the total current being drawn by all the WLED chains.
  • each of the chains is provided with secondary current measuring means which communicate with a control means, preferably a microprocessor operating under the control of a computer program, said control means adjusting the current flow through the WLEDs dependent on a comparison between the measured current through each individual chains, and optionally through the first current altering means.
  • a control means preferably a microprocessor operating under the control of a computer program
  • the WLED cluster comprises 18 WLEDs.
  • the current measuring means comprises a resistor connected in series with the series connected WLEDs in each chain, and further preferably the first and second and further current altering means comprise transistors.
  • the device is further provided with temperature measurement means which also communicate with the control means which adjusts the current flow through the WLED chains accordingly.
  • control means dynamically adjusts the current flows through the WLED chains such that the current flow therethrough is substantially uniform and is devoid of discontinuities regardless of the operating temperature and/or the failure of one or more of the WLEDs.
  • control means voltage lines, and chained series connected WLEDs are integrated on a single circuit.
  • the device is used to provide light for a seat, ideally an aircraft seat which often have sources of power built thereinto, and in this case the device would ideally be powered from said in-built power source.
  • control means also communicates with an indication means changing the state of same when said control means recognises that one or more of the WLEDs has failed.
  • the indication means comprises a light means emitting a light other than white, said light means being provided in series with gate means also in communication with the control means between the lines, said control means activating said gate means thus allowing current to flow through the light means to illuminate same only when one or more of the WLEDs has failed.
  • said light means is mounted proximate the WLEDs and is visible when the array of WLEDs, one of which has failed, is viewed.
  • the WLEDs and the optional indication means are mounted proximate one another in hexagonal close packed arrangement on a circuit board.
  • control means is also mounted in said circuit board.
  • the WLEDs are connected within the circuit in groups of three, said group being connected in series as a single chain which is parallely connected with others.
  • the grouping of the WLEDs in threes is such that any single WLED is adjacent one other WLED which is connected in series therewith.
  • the WLEDs and optional indication means are mounted on an integrated circuit board comprising wiring and to which said control means is additionally mounted.
  • the integrated circuit board is to be considered an independent and separately claimable aspect of this invention.
  • the indication means may be provided in a remote indicator panel and directly powered from the control means.
  • the indicator means may be simply one or more bits in a memory register which is interrogable by a suitably equipped engineer.
  • a control means for controlling current flow through a plurality of chains connected parallely between a pair of voltage lines, each of said chains having at least one WLED connected therein, current altering means being additionally connected in each of said chains and current measuring means being also provided in each of said chains which communicate with the control means, characterised in that the current flow through each of the chains is altered dependent on a comparison effected by the control means of the current flows through each of the plurality of chains such that the said current flows are maintained substantially uniform.
  • At least a single current altering means, and optionally current measurement means are provided between all of the chains and one of the voltage lines which are capable of altering and measuring respectively the total current flow through the all of the chains.
  • control means also communicates with user adjustable means for increasing the intensity or dimming the light emitted from the WLEDs, and also for switching the device on and off.
  • control means recognises when one or more of the WLEDs has failed and additionally causes a change of state of a further component which indicates that a fault has occurred.
  • the further component may be a warning light which can be instantly seen by an engineer, or a memory register in which a bit can be changed and stored for later analysis on connection to the control means of a lighting management system.
  • the device according to the invention can be controlled in a safe and reliable manner and the failures of the WLEDs used in the device can be minimised because of this operation. Furthermore, the constant and continual monitoring of the current flows through the WLED chains further mitigates against failure.
  • a further advantage of the device proposed herein is the uniform and relatively low power consumption throughout, for example, an aircraft which can now be achieved.
  • FIG. 1 there is shown a circuit 2 for providing controllable current through a series of chained WLEDs in accordance with the invention.
  • the circuit comprises high and low voltage lines 4, 6 between which a plurality of chains, three of which are shown at 8, 10, 12 and of which there are ideally 6 are connected in parallel.
  • Each of the chains is provided with three WLEDs 14, 16, 18 connected in series together with a transistor T X where X is the number from left to right of the particular chain, and a resistor R X over which there is a measurable potential drop within the particular chain.
  • a power transistor 20 which is connected between the high voltage line 4 and the paralelly connected chains 8, 10, 12. Said power transistor 20 provides a means of altering the total amount of current which is fed from the high voltage line to all of the chains.
  • the high voltage line 4 ideally provides a potential drop over the whole circuit beneath of either 12 or 15V DC, so it will immediately be appreciated that the overall power consumption of the device is relatively small, especially as the WLEDs 14, 16, 18 typically operate at low currents.
  • the circuit shown ideally controls the output light of a single WLED cluster comprising only those connected in the chains 8, 10, 12. Many more similar circuits will in practice be connected between the same two voltage lines 4, 6 and will provide light for a number of different seats within an aircraft or like vehicle.
  • the potential drop across all resistors R X is measured by suitable means and this information is fed to a microprocessor (not shown, but connections thereto are indicated by (M)) which can calculate the currents based on the value of the resistances.
  • Said microprocessor also communicates with and controls the power transistor 20, and the parallely connected transistors T X , and reduces or increases the current supplied to the bases of said transistors dependent on the current flowing through the resistors R X .
  • the entire circuit is ideally integrated on a printed circuit board (not shown) on which there is further provided a thermistor or like temperature measuring component (also not shown) which provides an indication of the operating temperature of the WLEDs to the microprocessor.
  • a thermistor or like temperature measuring component also not shown
  • the current supplied to all the WLEDs through the power transistor 20, and through each of the chains 8, 10, 12 can be dynamically adjusted by the microprocessor dependent on the operating temperature, the current flow through each of the chains, the total current flow, (although could be derived by the microprocessor from the total of the individual chain currents), and the instantaneous supply voltage.
  • a flow chart of the possible operation cycle of the microprocessor and the requirements of the program controlling same may be as follows:
  • FIG. 2 and 3 there is shown a schematic exploded view of some of the components which may be used in the construction of a working lighting device according to the invention.
  • An illuminating head is assembled from two shells 100 102, said first shell 100 having an aperture 104 which can receive a transparent insert 106 through which light is emitted.
  • the surface of the shell 100 in which the aperture 104 is provided will typically be directed downwardly above the lap of a user to project light thereon, and therefore this surface is often the under surface of the device.
  • a usually black opaque plastic insert 107 having a plurality of bores 108 which at least partially receive the tips of WLEDs 110 mounted on an integrated circuit (IC) board 112.
  • the bores are provided to isolate and insulate each of the WLEDs from one another, to prevent same from interfering with one another, and finally to provide some lateral support for said WLEDs as the terminals by which LEDs are commonly mounted on ICs are prone to fracture.
  • an indicator LED 114 of conventional colour (i.e. red) or alternate colour (e.g. green) is provided substantially centrally within the surrounding array of WLEDs and this particular LED is also received within a substantially central bore 108 within the insert 107.
  • Said particular LED when illuminated in accordance with a modified aspect of the invention to indicate when one or more WLEDs have failed, can be seen through the transparent insert 106 notwithstanding the emission of light through said insert 106 by the remaining illuminated WLEDs.
  • the timing of the replacement may depend on the maintenance schedule applicable to the particular aircraft in which the device is fitted.
  • a flex-and-stay type member 116 is clamped within the aperture defined when the two shells 100, 102 are brought together and a pair of current-carrying wires 120, 122 provide a source of power for corresponding contacts 124, 126 disposed at one end of the IC board 112. It is to be emphasised that the actual manner in which the WLED array is powered is not crucial to the invention, and other methods may be considered by persons skilled in the art.
  • microprocessor devices 128, 130 which perform the inventive control of supplied current to the various WLED chains which constitute the array, and the particular LED indication means which operates when one or more WLEDs has failed.
  • Other components such as thermistors to measure ambient temperature conditions may also be mounted on said IC board 112 as required by the invention.
  • FIG. 3 there is shown the particular "hexagonal-close-packed" array 132 of WLEDs mounted on said IC board 112. This arrangement is most desirable because it gives rise to a uniform and balanced light emission from the underside of said shell 100, and these characteristics are not adversely affected when one of the WLEDs fails. Additionally, the particular indication LED 114 can be clearly seen in Figure 3 centrally positioned within the array 132.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
EP00306085A 1999-08-19 2000-07-17 Vorrichtung zur Beleuchtungssteuerung Expired - Lifetime EP1079667B1 (de)

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
GB0000168 2000-01-06
GB0000168A GB0000168D0 (en) 2000-01-06 2000-01-06 Lighting control device

Publications (3)

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

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Application Number Title Priority Date Filing Date
EP00306085A Expired - Lifetime EP1079667B1 (de) 1999-08-19 2000-07-17 Vorrichtung zur Beleuchtungssteuerung

Country Status (4)

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

Cited By (29)

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Publication number Priority date Publication date Assignee Title
GB2374715A (en) * 2001-01-16 2002-10-23 Visteon Global Tech Inc Series LED backlight control circuit
DE10121380A1 (de) * 2001-05-02 2002-12-19 Garufo Gmbh Elektronisch abgesicherte Stromversorgung für Schaltungsgruppen, Anzeigevorrichtung für eine sich ändernde Information
EP1286571A2 (de) * 2001-05-02 2003-02-26 Garufo GmbH Elektronisch abgesicherte Stromversorgung für Schaltungsgruppen und Anzeigevorrichtung für eine sich änderende Information
WO2003061347A1 (de) * 2002-01-19 2003-07-24 Stührenberg GmbH Signalgeberleuchte mit leuchtdioden
DE10324609A1 (de) * 2003-05-30 2004-12-23 Osram Opto Semiconductors Gmbh Ansteuerschaltung für ein LED-Array und Verfahren zum Betreiben eines LED-Arrays
WO2005079121A2 (en) * 2004-02-11 2005-08-25 Peter Bhagat Apparatus for the control of lighting and associated methods
DE102004034359B3 (de) * 2004-07-13 2006-02-23 Siemens Ag Schaltungsanordnung zum Betreiben eines Leuchtzeichens
EP1145904A3 (de) * 2000-04-11 2006-04-05 Hella KGaA Hueck & Co. Ansteuervorrichtung für eine mit einer Anzahl von Leuchtioden versehene Leuchte eines Kraftfahrzeuges
EP1684001A1 (de) * 2005-01-20 2006-07-26 Christian Niederberger Leuchtmittel
DE102006032247A1 (de) * 2005-07-12 2007-01-25 Koito Manufacturing Co., Ltd. Beleuchtungs-Steuereinrichtung einer Beleuchtungsvorrichtung für ein Fahrzeug
WO2007036281A1 (de) * 2005-09-28 2007-04-05 Eppendorf Ag Laborvorrichtung zur gleichzeitigen durchführung von reaktionen in einer mehrzahl von proben
WO2007077007A1 (de) * 2006-01-03 2007-07-12 Vossloh-Schwabe Optoelektronik Gmbh & Co. Kg Verschaltete anordnung von wenigstens einen leuchtdiodenchip aufweisenden einzelmodulen
DE102005047610B4 (de) * 2004-10-05 2007-08-02 Koito Manufacturing Co., Ltd. Beleuchtungssteuerschaltung für Fahrzeuglampen
WO2007092355A1 (en) * 2006-02-03 2007-08-16 Honeywell International Inc. Temperature controlled led array
EP1871145A1 (de) 2006-06-19 2007-12-26 Münchner Hybrid Systemtechnik GmbH Leuchtensystem
WO2008086050A2 (en) * 2007-01-04 2008-07-17 Allegro Microsystems, Inc. Electronic circuit for driving a diode load
DE102009018428A1 (de) 2009-04-22 2010-10-28 Vishay Electronic Gmbh Schaltung für eine Leuchtdiodenanordnung und Leuchtdiodenmodul
CN1596560B (zh) * 2001-11-26 2011-04-06 奥斯兰姆奥普托半导体有限责任公司 发光二极管阵列的电路布置
EP1965609A3 (de) * 2007-02-27 2011-06-15 Lumination, LLC Erkennung von Kettendefekten mittels LED
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Cited By (52)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1145904A3 (de) * 2000-04-11 2006-04-05 Hella KGaA Hueck & Co. Ansteuervorrichtung für eine mit einer Anzahl von Leuchtioden versehene Leuchte eines Kraftfahrzeuges
GB2374715B (en) * 2001-01-16 2003-04-16 Visteon Global Tech Inc Series LED backlight control circuit
US7262752B2 (en) 2001-01-16 2007-08-28 Visteon Global Technologies, Inc. Series led backlight control circuit
GB2374715A (en) * 2001-01-16 2002-10-23 Visteon Global Tech Inc Series LED backlight control circuit
DE10121380A1 (de) * 2001-05-02 2002-12-19 Garufo Gmbh Elektronisch abgesicherte Stromversorgung für Schaltungsgruppen, Anzeigevorrichtung für eine sich ändernde Information
EP1286571A2 (de) * 2001-05-02 2003-02-26 Garufo GmbH Elektronisch abgesicherte Stromversorgung für Schaltungsgruppen und Anzeigevorrichtung für eine sich änderende Information
EP1286571A3 (de) * 2001-05-02 2005-03-30 Garufo GmbH Elektronisch abgesicherte Stromversorgung für Schaltungsgruppen und Anzeigevorrichtung für eine sich änderende Information
CN1596560B (zh) * 2001-11-26 2011-04-06 奥斯兰姆奥普托半导体有限责任公司 发光二极管阵列的电路布置
WO2003061347A1 (de) * 2002-01-19 2003-07-24 Stührenberg GmbH Signalgeberleuchte mit leuchtdioden
DE10324609A1 (de) * 2003-05-30 2004-12-23 Osram Opto Semiconductors Gmbh Ansteuerschaltung für ein LED-Array und Verfahren zum Betreiben eines LED-Arrays
DE10324609B4 (de) * 2003-05-30 2014-11-13 Osram Gmbh Ansteuerschaltung und LED-Array sowie Verfahren zum Betreiben eines LED-Arrays
WO2005079121A2 (en) * 2004-02-11 2005-08-25 Peter Bhagat Apparatus for the control of lighting and associated methods
US8487545B2 (en) 2004-02-11 2013-07-16 Peter Bhagat Apparatus for the control of lighting and associated methods
WO2005079121A3 (en) * 2004-02-11 2005-11-17 Peter Bhagat Apparatus for the control of lighting and associated methods
DE102004034359B3 (de) * 2004-07-13 2006-02-23 Siemens Ag Schaltungsanordnung zum Betreiben eines Leuchtzeichens
US7327051B2 (en) 2004-10-05 2008-02-05 Koito Manufacturing Co., Ltd. Lighting control circuit for vehicle lamps
DE102005047610B4 (de) * 2004-10-05 2007-08-02 Koito Manufacturing Co., Ltd. Beleuchtungssteuerschaltung für Fahrzeuglampen
EP1684001A1 (de) * 2005-01-20 2006-07-26 Christian Niederberger Leuchtmittel
US7482765B2 (en) 2005-07-12 2009-01-27 Koito Manufacturing Co., Ltd. Lighting control apparatus of lighting device for vehicle
DE102006032247A1 (de) * 2005-07-12 2007-01-25 Koito Manufacturing Co., Ltd. Beleuchtungs-Steuereinrichtung einer Beleuchtungsvorrichtung für ein Fahrzeug
DE102006032247B4 (de) * 2005-07-12 2009-02-19 Koito Manufacturing Co., Ltd. Beleuchtungs-Steuereinrichtung einer Beleuchtungsvorrichtung für ein Fahrzeug
WO2007036281A1 (de) * 2005-09-28 2007-04-05 Eppendorf Ag Laborvorrichtung zur gleichzeitigen durchführung von reaktionen in einer mehrzahl von proben
US8101897B2 (en) 2005-09-28 2012-01-24 Eppendorf Ag Laboratory apparatus for simultaneously carrying out reactions in a plurality of samples
WO2007077007A1 (de) * 2006-01-03 2007-07-12 Vossloh-Schwabe Optoelektronik Gmbh & Co. Kg Verschaltete anordnung von wenigstens einen leuchtdiodenchip aufweisenden einzelmodulen
US8446100B2 (en) 2006-01-03 2013-05-21 Vossloh-Schwabe Optoelektronik Gmbh & Co. Kg Interconnected arrangement of individual modules having at least one light-emitting diode chip
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
WO2007092355A1 (en) * 2006-02-03 2007-08-16 Honeywell International Inc. Temperature controlled led array
CN101401486B (zh) * 2006-02-03 2011-03-09 霍尼韦尔国际公司 在更高工作温度下提高发光二极管阵列工作可靠性及在汽车灯中的使用
EP1871145A1 (de) 2006-06-19 2007-12-26 Münchner Hybrid Systemtechnik GmbH Leuchtensystem
US7675245B2 (en) 2007-01-04 2010-03-09 Allegro Microsystems, Inc. Electronic circuit for driving a diode load
US8274238B2 (en) 2007-01-04 2012-09-25 Allegro Microsystems, Inc. Electronic circuit for driving a diode load
WO2008086050A3 (en) * 2007-01-04 2008-10-16 Allegro Microsystems Inc Electronic circuit for driving a diode load
WO2008086050A2 (en) * 2007-01-04 2008-07-17 Allegro Microsystems, Inc. Electronic circuit for driving a diode load
EP1965609A3 (de) * 2007-02-27 2011-06-15 Lumination, LLC Erkennung von Kettendefekten mittels LED
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Also Published As

Publication number Publication date
ES2265871T3 (es) 2007-03-01
DE60030516D1 (de) 2006-10-19
DE60030516T2 (de) 2007-06-06
EP1079667B1 (de) 2006-09-06
EP1079667A3 (de) 2003-11-12
ATE339077T1 (de) 2006-09-15

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