EP1648204B1 - Fahrzeug-Beleuchtungsvorrichtung und Verfahren zum Steuern einer Fahrzeug-Beleuchtungsvorrichtung - Google Patents

Fahrzeug-Beleuchtungsvorrichtung und Verfahren zum Steuern einer Fahrzeug-Beleuchtungsvorrichtung Download PDF

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Publication number
EP1648204B1
EP1648204B1 EP05022530A EP05022530A EP1648204B1 EP 1648204 B1 EP1648204 B1 EP 1648204B1 EP 05022530 A EP05022530 A EP 05022530A EP 05022530 A EP05022530 A EP 05022530A EP 1648204 B1 EP1648204 B1 EP 1648204B1
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EP
European Patent Office
Prior art keywords
light
emitting diode
clock pulse
pulse signal
control 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.)
Not-in-force
Application number
EP05022530A
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German (de)
English (en)
French (fr)
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EP1648204A1 (de
Inventor
Christoph Buhr
Anja Böttcher
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.)
Volkswagen AG
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Volkswagen AG
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Filing date
Publication date
Application filed by Volkswagen AG filed Critical Volkswagen AG
Publication of EP1648204A1 publication Critical patent/EP1648204A1/de
Application granted granted Critical
Publication of EP1648204B1 publication Critical patent/EP1648204B1/de
Not-in-force 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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S362/00—Illumination
    • Y10S362/80—Light emitting diode

Definitions

  • the present invention relates to a vehicle lighting device having at least one light emitting diode and a light control device, wherein the light control device is connected to the at least one light emitting diode and with the light control device, a pulse width modulated clock pulse signal generated and the at least one light diode can be transmitted. Furthermore, the invention relates to a method for controlling a vehicle lighting device having at least one light emitting diode and a light control device.
  • LEDs are increasingly being used as light sources. Especially in the field of exterior lighting of motor vehicles, the LED is gaining more and more importance. These light sources have the advantage over conventional incandescent lamps that they have a longer life and greater power efficiency.
  • the light-emitting diodes are arranged, for example, in one field or in several fields. You can realize different light functions in this way. There are light functions that differ in their brightness, i. the light functions differ in their luminous flux, which is emitted at the respective light function. In this way, the same light-emitting diode or the same light-emitting diode array can realize two or more light functions by emitting a different light flux in the respective light function.
  • LEDs are conventionally driven by a pulse width modulated clock pulse signal.
  • the luminous flux i.
  • the brightness of the LED is thereby changed over the duty cycle of the clock pulse signal, i. it changes the ratio of the active to the passive phase.
  • a lighting device for a motor vehicle which has light-emitting diodes as light sources whose brightness is adjustable. The brightness is adjusted by changing the duty cycle (pulse-pause ratio).
  • a procedure for driving bulbs of vehicles and an apparatus for performing the method in which the brightness of the light-emitting diodes is controlled by the pulse-pause ratio.
  • the LED is supplied with a pulse-width modulated clock pulse signal in order to dim the emitted light output, while minimizing color changes in dimming.
  • the pulse-width-modulated clock pulse signal is generated in that the current supplied to the light-emitting diode is conducted at a predetermined voltage across different resistors. To conduct the current across the respective resistor, a switch is actuated by means of a signal from a pulse generator.
  • a disadvantage of conventional controls of the light emitting diodes on the duty cycle of the pulse width modulated clock pulse signal is that the resolution of the brightness change, especially at low levels of brightness, is too low.
  • the duty cycle of the clock pulse signal can usually be changed from 1% to 100% with a step size of at least 1%. If the LED is not only intended to realize two different light functions with different brightnesses, but in each case to change the brightness of one or more light functions with a very fine resolution, the step sizes of known control units for the light-emitting diode are not sufficient.
  • a circuit is arranged between the light control device and the at least one light emitting diode, with the in Depending on a control signal, the pulse width modulated clock pulse signal can be supplied via different resistors of the at least one light emitting diode.
  • control signal predefines the brightness range of the at least one light-emitting diode.
  • various resistances are provided in the circuit, which are assigned to different brightness ranges.
  • the resistors in turn, each switch assigned, which can be switched by means of relays or power electronics.
  • the switches are arranged such that when the switch is closed, the pulse-width-modulated clock pulse signal of the at least one light-emitting diode can be supplied via the resistor assigned to the respective switch.
  • the overall brightness characteristic curve of the at least one light-emitting diode which is generated by the resistance circuit approaches a (logarithmic or) exponential function in accordance with a preferred embodiment of the vehicle lighting device according to the invention.
  • This embodiment has the advantage that brightness changes can be better adapted to the perception of the human eye.
  • the sensitivity of the human eye is not linear, but approximately logarithmic.
  • the circuit is designed so that a clock pulse signal with a smaller duty cycle of the at least one light emitting diode is supplied via a larger resistor and a clock pulse signal with a larger duty cycle of the at least one light emitting diode is supplied via a smaller resistor.
  • the vehicle lighting device according to the invention can thus be preferably used a light control device, which can change the duty cycle of the pulse width modulated clock pulse signal linearly with a fixed step size. It can thus be a conventional light control device in the vehicle lighting device according to the invention be used, thereby saving costs. It is only necessary to provide the circuit between the light control device and the light emitting diode.
  • the light control device In the method according to the invention for controlling the vehicle lighting device, the light control device generates a pulse-width-modulated clock pulse signal and transmits it to a circuit.
  • the circuit receives a control signal and, in response to the control signal, supplies the pulse width modulated clock pulse signal to the at least one light emitting diode via various resistors.
  • the brightness resolution for each brightness range can advantageously be adjusted as desired, wherein furthermore a conventional pulse-width-modulated clock pulse signal whose duty cycle can be changed with a certain predetermined step size can be used.
  • a desired brightness is transmitted to the light control device and the light control device generates the duty cycle of the pulse width modulated clock pulse signal in dependence on the desired brightness.
  • the control signal preferably indicates in which brightness range the desired brightness of the at least one light-emitting diode lies. Each brightness range in this case corresponds to a resistor provided in the circuit, the sizes of the resistors differing.
  • the duty cycle of the pulse-width-modulated clock pulse signal can be changed linearly with a fixed step size, wherein the duty cycle is set as a function of the _soll brightness.
  • the control signal specifies over which resistor path the clock pulse signal of the light-emitting diode is supplied, so that the brightness characteristic, ie in particular the Brightness change between the fixed predetermined step size over which resistors can be set arbitrarily.
  • a clock pulse signal having a smaller duty cycle is supplied to the at least one light-emitting diode via a larger resistor, and a clock pulse signal having a larger duty cycle is supplied to the at least one light-emitting diode via a smaller resistor.
  • the desired brightness depends on the ambient conditions of the motor vehicle.
  • the visibility of the rear light signals on the vehicle can be improved, since they lead to different brightnesses, for example during the day and at night.
  • the lighting device may be, for example, interior lighting units or exterior lighting units of a motor vehicle. These may be headlamps, direction indicators, tail and tail lights at the rear of the vehicle, reversing lights, daytime running lights, fog lights, side direction indicators or adaptive lighting functions of the vehicle.
  • the lighting device has a light-emitting diode 3 or a field with a plurality of light-emitting diodes.
  • the LED 3 is controlled by a known light control device 1.
  • This light control device 1 receives a value for the desired brightness via a vehicle bus 5.
  • the light controller generates from this a pulse width modulated clock pulse signal whose duty cycle corresponds to the value of the desired brightness.
  • the light control device 1, the in Fig. 2 shown Take into account the brightness characteristic of the lighting device.
  • the pulse width modulated clock pulse signal PWM is transmitted to the circuit 2.
  • a control signal S is transmitted to the circuit 2. In the exemplary embodiment shown, this control signal S is also transmitted by the light control device 1.
  • each series resistor R1, R2 or R3 is assigned a switch S1, S2 or S3. In each case one of these switches S1, S2 or S3 can be closed by a controller 4.
  • the resistors R1, R2 and R3 are connected via their respective switches S1, S2 and S3 on the one hand to the light-emitting diode and on the other hand to the input of the circuit 2 for the clock pulse signal from the light control device 1. If, for example, the switch S1 is closed by the controller 4, the clock pulse signal is supplied to the light-emitting diode 3 via the resistor R1. On the other hand, if the switch S2 is closed, the clock pulse signal via the resistor R2 and corresponding to S3 is supplied via the resistor R3 of the light emitting diode 3.
  • the controller 4 is a microcontroller with an interface for the bus 5, via which the control signal S is supplied.
  • the controller 4 also relays or power electronics, for example with power semiconductors, are provided, which represent the switches S1, S2 and S3.
  • the resistors R1, R2 and R3 are each brightness ranges A, B and C (see. Fig. 2 ). If the control signal S represents the setpoint brightness value, the controller 4 determines in which brightness range A, B or C the setpoint brightness value is located.
  • the controller 4 closes the switch S1
  • the setpoint brightness value is in the brightness range B
  • the controller 4 closes the switch S2
  • the controller 4 closes the switch S3
  • the in Fig. 2 shown brightness characteristic can be generated.

Landscapes

  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Arrangements Of Lighting Devices For Vehicle Interiors, Mounting And Supporting Thereof, Circuits Therefore (AREA)
EP05022530A 2004-10-18 2005-10-14 Fahrzeug-Beleuchtungsvorrichtung und Verfahren zum Steuern einer Fahrzeug-Beleuchtungsvorrichtung Not-in-force EP1648204B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004050655A DE102004050655A1 (de) 2004-10-18 2004-10-18 Fahrzeug-Beleuchtungsvorrichtung und Verfahren zum Steuern einer Fahrzeug-Beleuchtungsvorrichtung

Publications (2)

Publication Number Publication Date
EP1648204A1 EP1648204A1 (de) 2006-04-19
EP1648204B1 true EP1648204B1 (de) 2008-06-25

Family

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EP05022530A Not-in-force EP1648204B1 (de) 2004-10-18 2005-10-14 Fahrzeug-Beleuchtungsvorrichtung und Verfahren zum Steuern einer Fahrzeug-Beleuchtungsvorrichtung

Country Status (5)

Country Link
US (1) US7385495B2 (ja)
EP (1) EP1648204B1 (ja)
JP (1) JP5043324B2 (ja)
AT (1) ATE399452T1 (ja)
DE (2) DE102004050655A1 (ja)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP3915336B1 (de) * 2019-01-22 2023-11-08 Meridian AG Treiberschaltung, verfahren zur laseransteuerung, sowie ophthalmologische laserbehandlungsvorrichtung

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Also Published As

Publication number Publication date
DE502005004509D1 (de) 2008-08-07
US20060083011A1 (en) 2006-04-20
JP2006111265A (ja) 2006-04-27
EP1648204A1 (de) 2006-04-19
US7385495B2 (en) 2008-06-10
ATE399452T1 (de) 2008-07-15
DE102004050655A1 (de) 2006-06-01
JP5043324B2 (ja) 2012-10-10

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