EP1641323A1 - LED-Beleuchtungssystem und -verfahren mit mindestens zwei Lichtquellen - Google Patents

LED-Beleuchtungssystem und -verfahren mit mindestens zwei Lichtquellen Download PDF

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Publication number
EP1641323A1
EP1641323A1 EP05018090A EP05018090A EP1641323A1 EP 1641323 A1 EP1641323 A1 EP 1641323A1 EP 05018090 A EP05018090 A EP 05018090A EP 05018090 A EP05018090 A EP 05018090A EP 1641323 A1 EP1641323 A1 EP 1641323A1
Authority
EP
European Patent Office
Prior art keywords
illumination system
feature
actual value
led
light
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.)
Ceased
Application number
EP05018090A
Other languages
German (de)
English (en)
French (fr)
Inventor
Alois Biebl
Stefan Hackenbuchner
Günther Hirschmann
Reinhard Dr. Weitzel
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP1641323A1 publication Critical patent/EP1641323A1/de
Ceased legal-status Critical Current

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    • 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
    • H05B35/00—Electric light sources using a combination of different types of light generation
    • 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
    • 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
    • H05B45/22—Controlling the colour of the light using optical feedback

Definitions

  • the present invention relates to a lighting system with at least two light sources, of which at least one light source comprises an LED. It also relates to a method for operating such a lighting system.
  • Lighting systems of the type mentioned are well known in the art, the simplest method to operate LEDs is to connect the LED together with a series resistor to a DC power source.
  • the series resistor serves to limit the current of the light-emitting diode current I F (forward current).
  • I F forward current
  • the forward current I F can be varied, whereby the brightness of the light emitted by the light-emitting diodes is also varied.
  • the dimming capability of a system which may include light emitting diodes and other bulbs as a light source, can be achieved.
  • the phenomenon of color locus shift in green LEDs can be observed.
  • the dominant wavelength at a forward current of 3 mA is greater than 540 nm and decreases as the forward current increases to 90 mA below 512 nm.
  • the principle of pulse width modulation is used to solve this problem, ie to keep constant the color location of the light emitted by the LED.
  • a LED is always switched on and off with the same forward current I Fmax over a period T.
  • the duty cycle which is calculated from the quotient of the turn-on time t p divided by the period T, determines the brightness of the light emitted by the LED.
  • a large duty cycle results in a bright LED, a small duty cycle inversely to a weaker LED.
  • the integration of the light emitted by the LED is performed by the human eye. For periods T less than 10 ms, the light is registered by the eye as continuous. At longer periods, a flickering of the light can be perceived by the eye.
  • the corresponding standard of BMW provides that the rising edge in clocked operation is a maximum of 20 mA / ⁇ s. If this limit is met, then very long turn-on and turn-off and associated very high switching losses. With the measures known from the prior art, one must therefore decide for one of the evil, either disturbances or Farbortverschiebitch or high switching losses.
  • the present invention is therefore based on the object, a lighting system of the type mentioned above or the aforementioned method such that the brightness can be varied, but without disturbances or high switching losses occur, the color point remains largely constant.
  • the present invention is based on the recognition that initially switched to DC operation to avoid interference from the clocked operation.
  • the color locus change occurring in DC operation in the dimming mode is detected according to the invention and the DC signal used to drive the at least one LED is changed in such a way that the desired brightness is established, the color locus remaining largely unchanged.
  • the illumination system comprises a plurality of LEDs that emit light of different color locations, such as red, green, and blue light
  • a color locus shift caused by dimming may be corrected if the individual LEDs are driven with different parameters after dimming.
  • a preferred embodiment is characterized in that the sensor device comprises at least one voltage-frequency converter.
  • the sensor device comprises at least one voltage-frequency converter.
  • the control device includes a microprocessor connected to the output of the at least one voltage-to-frequency converter is connected, it can count the pulses in the output signal of the at least one voltage-frequency converter, without the interposition of an A / D converter would be necessary.
  • the standard color values X, Y, Z are thus easily reflected as the number of pulses per unit time. From this, the standard color value components Cx and Cy can be determined, see above.
  • voltage signals can be provided by the filter devices, which are evaluated by the microprocessor with the interposition of at least one A / D converter.
  • At least one further light source may be present, which may preferably be selected from the following types: LED, fluorescent lamp, halogen incandescent lamp, high-pressure discharge lamp.
  • the at least one feature of the light emitted by the illumination system may be the color temperature and / or the brightness and / or the color location.
  • the setpoint specification device has an interface into which at least one desired value can be input by an operator or at least one desired value can be selected from a number of setpoint values already stored in the setpoint specification device. This allows the same lighting of a room to be used to create different moods. When operating in a motor vehicle, country-specific color temperatures or fashion colors, eg. B. Cool Blue, be realized.
  • the components of the illumination system are designed for operation in a motor vehicle, in particular the supply voltage required for the operation of the components, as well as the quality of the light emitted by the illumination system. Since the brightness can be adjusted independently of the color temperature with an illumination system according to the invention, this makes it possible to realize dimmable headlights. This feature is very important for daytime running lights, which is already mandatory in many countries. So far, halogen lamps with a color temperature of, for example, 3200 K for H4 lamps or high-intensity discharge lamps (D2 / D1 lamps) with a color temperature of 4200 K are used for headlights, with which also a function as a daytime running light is possible. The disadvantage is that the life is very limited.
  • the driver device may be configured to operate all the light sources of the lighting system.
  • the light sources of the illumination system in particular grouped by types, can also be controlled independently of one another.
  • parameters for operating the light sources may be stored in the event that the sensor device and / or the actual value memory device and / or the setpoint presetting device fails. It can be provided that the control of the light sources takes place so that they give white light with preset values. Alternatively, it can be provided that a color temperature is predefined by the user for the error case and stored, for example, in a memory unit.
  • the determination of the at least one feature of the light emitted by the illumination system according to the invention can be carried out completely independently of the activation of the at least one LED.
  • the determination of the respective feature would have to be performed with an increase in complexity exactly when the corresponding LED is switched on.
  • an inventive lighting system is characterized by easier realizability and increased reliability.
  • a desired value of a dimming position of the lighting system can correspond.
  • FIG. 1 shows a schematic representation of a block diagram of a lighting system according to the invention.
  • FIG. 1 shows a schematic circuit diagram of a lighting system according to the invention. It comprises a plurality of light sources, which are combined in a block 10, wherein at least one light source - as shown schematically - is an LED 11, which is operated with a direct current signal.
  • the light emitted by the block 10 is detected by a sensor device 12, with which at least one feature of the light emitted by the illumination system can be determined. As characteristics come into consideration the color temperature, the brightness or the color location.
  • the at least one feature determined by the sensor device 12 is stored in an actual value memory device 14.
  • the actual value memory device 14 may be designed to store the values of several features.
  • the actual value of the at least one feature is provided to a control device 16.
  • This has an interface 20 via which at least one desired value can be input by an operator or at least one desired value can be selected from a number of setpoint values already stored in the desired value presetting device 18.
  • the control device 16 compares the setpoint value of the at least one feature with the actual value of the at least one feature and provides at its output a control signal to a driver device 22 such that the driver device changes a characteristic of the DC signal used to drive the at least one LED the actual value of the at least one feature approaches the target value of the at least one feature.
  • LEDs may be present as light sources in block 10, but LEDs may also be combined with other types of light sources, for example high pressure discharge lamps, halogen incandescent lamps, fluorescent lamps.
  • Driver device 22 may be configured to change only the signals used to drive the at least one LED, but may also be configured to modify the drive signals of the other light sources as well.
  • a filter device 24 and a voltage-frequency converter 26 is shown schematically.
  • the output signals of the three voltage-frequency converter 26 are supplied to a microprocessor, which determines the standard color values X, Y, Z by counting the pulses in a simple manner.
  • the microprocessor from the standard color values X, Y, Z calculates the standard color value components Cx and Cy.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Led Devices (AREA)
EP05018090A 2004-09-20 2005-08-19 LED-Beleuchtungssystem und -verfahren mit mindestens zwei Lichtquellen Ceased EP1641323A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004045515A DE102004045515A1 (de) 2004-09-20 2004-09-20 Beleuchtungssystem mit mindestens zwei Lichtquellen und Verfahren zum Betreiben eines derartigen Beleuchtungssystems

Publications (1)

Publication Number Publication Date
EP1641323A1 true EP1641323A1 (de) 2006-03-29

Family

ID=35636895

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05018090A Ceased EP1641323A1 (de) 2004-09-20 2005-08-19 LED-Beleuchtungssystem und -verfahren mit mindestens zwei Lichtquellen

Country Status (8)

Country Link
US (1) US7288900B2 (zh)
EP (1) EP1641323A1 (zh)
JP (1) JP2006093133A (zh)
KR (1) KR20060051195A (zh)
CN (1) CN1770945A (zh)
CA (1) CA2520233A1 (zh)
DE (1) DE102004045515A1 (zh)
TW (1) TW200621089A (zh)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100706502B1 (ko) * 2006-07-28 2007-04-10 강천웅 등화 제어시스템
TW200821555A (en) * 2006-11-10 2008-05-16 Macroblock Inc Illuminating apparatus and brightness switching device thereof
CN100521839C (zh) * 2006-11-24 2009-07-29 聚积科技股份有限公司 照明装置及其亮度切换装置
JP4983278B2 (ja) * 2007-01-31 2012-07-25 スタンレー電気株式会社 車両用灯具
US7543957B1 (en) 2008-01-29 2009-06-09 General Electric Company Thermal management of LEDS integrated to compact fluorescent lamps
US7759880B2 (en) * 2008-02-12 2010-07-20 General Electric Company Combined ballast for fluorescent lamp and light emitting diode and method of driving same
TWI454125B (zh) * 2008-04-22 2014-09-21 Htc Corp 可攜式電子裝置與其發光元件之閃爍調控方法
CN101566334B (zh) * 2008-04-23 2011-04-13 宏达国际电子股份有限公司 可携式电子装置与其发光组件的闪烁调控方法
DE102008064073A1 (de) * 2008-12-19 2010-06-24 Osram Gesellschaft mit beschränkter Haftung Verfahren zur Herstellung einer Mehrzahl von LED-Beleuchtungsvorrichtungen und LED-Beleuchtungsvorrichtung
US20110133665A1 (en) * 2009-12-09 2011-06-09 Mei-Yueh Huang Luminance adjusting device
EP2609365B1 (de) 2010-08-26 2015-07-08 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Leuchtmittel, insbesondere zum betrieb in fassungen für leuchtstofflampen
US8305005B2 (en) 2010-09-08 2012-11-06 Integrated Crystal Technology Inc. Integrated circuit for driving high-voltage LED lamp
DE102011118332A1 (de) * 2011-11-11 2013-05-16 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Beleuchtungsvorrichtung eines Fahrzeugs
EP2728972B1 (en) * 2012-10-31 2015-08-26 Helvar Oy Ab Controlling operation of light sources

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3910438A1 (de) * 1989-03-31 1990-10-04 Kulzer & Co Gmbh Verfahren und vorrichtung zur polymerisation eines koerpers aus dentalkunststoff
US6359274B1 (en) * 1999-01-25 2002-03-19 Gentex Corporation Photodiode light sensor
US20020047624A1 (en) * 2000-03-27 2002-04-25 Stam Joseph S. Lamp assembly incorporating optical feedback
US20020097000A1 (en) * 2000-12-07 2002-07-25 Philips Electronics North America Corporation White led luminary light control system
US6495964B1 (en) * 1998-12-18 2002-12-17 Koninklijke Philips Electronics N.V. LED luminaire with electrically adjusted color balance using photodetector
DE10216645A1 (de) * 2002-04-15 2003-11-06 Siteco Beleuchtungstech Gmbh Leuchte mit variabler Lichtfarbe

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5225667B1 (zh) * 1971-04-18 1977-07-08
US6175771B1 (en) * 1997-03-03 2001-01-16 Light & Sound Design Ltd. Lighting communication architecture
US6611610B1 (en) * 1997-04-02 2003-08-26 Gentex Corporation Vehicle lamp control
US6175201B1 (en) * 1999-02-26 2001-01-16 Maf Technologies Corp. Addressable light dimmer and addressing system
EP1526760A1 (en) * 2003-10-21 2005-04-27 IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A. Multiple electroluminescent lamp driver

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3910438A1 (de) * 1989-03-31 1990-10-04 Kulzer & Co Gmbh Verfahren und vorrichtung zur polymerisation eines koerpers aus dentalkunststoff
US6495964B1 (en) * 1998-12-18 2002-12-17 Koninklijke Philips Electronics N.V. LED luminaire with electrically adjusted color balance using photodetector
US6359274B1 (en) * 1999-01-25 2002-03-19 Gentex Corporation Photodiode light sensor
US20020047624A1 (en) * 2000-03-27 2002-04-25 Stam Joseph S. Lamp assembly incorporating optical feedback
US20020097000A1 (en) * 2000-12-07 2002-07-25 Philips Electronics North America Corporation White led luminary light control system
DE10216645A1 (de) * 2002-04-15 2003-11-06 Siteco Beleuchtungstech Gmbh Leuchte mit variabler Lichtfarbe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS INC. (TAOS): "TCS230 PROGRAMMABLE COLOR LIGHT-TO-FREQUENCY CONVERTER", February 2003 (2003-02-01), PLANO, TEXAS, US, pages 1 - 10, Retrieved from the Internet <URL:HTTP://WWW.W-R-E.DE/ROBOTIK/DATA/OPT/TCS230.PDF> *

Also Published As

Publication number Publication date
US7288900B2 (en) 2007-10-30
KR20060051195A (ko) 2006-05-19
CA2520233A1 (en) 2006-03-20
DE102004045515A1 (de) 2006-03-30
CN1770945A (zh) 2006-05-10
US20060061300A1 (en) 2006-03-23
JP2006093133A (ja) 2006-04-06
TW200621089A (en) 2006-06-16

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