EP2210452A2 - Verfahren zum dimmen einer leuchtdiodenanordnung eines kraftfahrzeugs - Google Patents
Verfahren zum dimmen einer leuchtdiodenanordnung eines kraftfahrzeugsInfo
- Publication number
- EP2210452A2 EP2210452A2 EP08844799A EP08844799A EP2210452A2 EP 2210452 A2 EP2210452 A2 EP 2210452A2 EP 08844799 A EP08844799 A EP 08844799A EP 08844799 A EP08844799 A EP 08844799A EP 2210452 A2 EP2210452 A2 EP 2210452A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- pulse width
- light
- emitting diode
- dimming
- period
- 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
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]
- H05B45/10—Controlling the intensity of the light
Definitions
- the invention relates to a method for dimming a light-emitting diode arrangement according to claim 1.
- Light-emitting diode arrangements are increasingly used in motor vehicles for various functions. In some cases, it is necessary to dim the light intensity of the light-emitting diode arrangement in order to adapt it to the conditions.
- the individual light levels should be infinitely adjustable without visible jumps. For this, the jump of the light intensity may amount to a maximum of 2%, based on the current light intensity. This is critical especially in lower ranges of light intensity.
- a turn signal circuit is known in which at least one of the flashing lights is replaced by light emitting diodes.
- a light bulb current must be simulated for the LEDs. This is achieved in that a current flow is set by the control of an electrical load, wherein a pulse width of a periodic signal is modulated in time according to a current characteristic of the replaced flashing lamp.
- DE 10 2004 028 987 A1 describes a method for controlling a lighting unit comprising at least one light-emitting diode, in which a supplied current is controlled as a function of the outside temperature. For this purpose, a current or a duty cycle of a pulse width modulation is changed according to the outside temperature.
- microcontrollers In order to be able to steer continuously without visible jumps in the light intensity when using light-emitting diodes as light sources, microcontrollers with a resolution of min. at least 10 bits corresponding to 1023 light intensity levels. This is especially true for a lower range of light intensity, where each jump represents a relatively large percentage change. These microcontrollers require a corresponding relatively high effort.
- the object of the invention is to provide a method for dimming a light emitting diode array, which allows the use of simple and inexpensive electronic elements.
- the pulse width signal is modulated as a function of a setpoint specification with a variable duty cycle and a simultaneously variable period duration. This means that with each change in the setpoint value of the pulse width modulation, both the switch-on duration and the period duration are changed. This causes a reduction of the change jumps, so that even with the use of a cheaper 8-bit microcontroller, a pulse width modulation can be done that ensures satisfactorily small and therefore imperceptible jumps in light intensity in the lower range.
- FIG. 1 is a diagram of the duty cycle, the period and a resulting pulse width modulation and Fig. 2 shows a resulting frequency of a pulse width modulated signal.
- a motor vehicle e.g. integrated in the headlights LED arrangements.
- These light-emitting diode arrangements are intended to ensure on the one hand a daytime running light with 100% light intensity and on the other hand a substantially fainter light position light.
- This position light should be in a range of 4 to 10% of the daylight driving light intensity and adapted to changing outside light conditions. These adjustments should be imperceptible to the human eye.
- the light intensity of the light emitting diode arrangements is controlled by means of a pulse width modulation (PWM), which is generated by an 8 bit microcontroller.
- PWM pulse width modulation
- the modulation takes place by changing the switch-on time T e m and the period T p as a function of a desired value specification, these values being calculated once and stored in a memory assigned to the microcontroller.
- Tem N (Tein-soll * T e in-max / 100)
- T P N (100 * Tein / Tein-soll)
- N means that an integer is formed as a rounded value of the value calculated in the following parenthesis; because the pulse width modulation memory of a microcontroller can only work with integers.
- T e j n -soi ⁇ is the target specification of the pulse width modulation and is 0 to 100%.
- T e jn-max is an integer from 0 to 250, which corresponds to the maximum period duration and, together with a clock frequency of the pulse width modulation of the microcontroller, defines the minimum frequency of the pulse width modulation signal.
- 1 shows the calculated values for the duty cycle of T e i n and the period duration T p of the pulse width modulation in dependence setpoint are illustrated 5-8%.
- the duty cycle T ⁇ i n increases stepwise in this range from 12 to 20%, each step corresponding to a jump of the duty cycle T ⁇ i n of 1%.
- the period T p is a sawtooth, each stage corresponds to a tooth; the period T p is between 230 and 250 Hz. It falls over the length of the stage from 250 Hz to the smaller value and then increases suddenly to 250 Hz.
- the actual value of the pulse width modulation control power in% corresponds to the setpoint.
- the frequency of the pulse width modulation signal that results with the switch-on duration T e j n and the period T p according to FIG. 1 is shown in FIG.
- the frequency of the pulse width modulation signal is significantly higher, especially in the range of short switch-on times T e i n , than without the simultaneous change according to the invention of the switch-on duration T ⁇ in and the period T p .
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007052434A DE102007052434A1 (de) | 2007-11-02 | 2007-11-02 | Verfahren zum Dimmen einer Leuchtdiodenanordnung eines Kraftfahrzeugs |
PCT/EP2008/064772 WO2009056618A2 (de) | 2007-11-02 | 2008-10-31 | Verfahren zum dimmen einer leuchtdiodenanordnung eines kraftfahrzeugs |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2210452A2 true EP2210452A2 (de) | 2010-07-28 |
EP2210452B1 EP2210452B1 (de) | 2011-03-30 |
Family
ID=40375675
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08844799A Not-in-force EP2210452B1 (de) | 2007-11-02 | 2008-10-31 | Verfahren zum dimmen einer leuchtdiodenanordnung eines kraftfahrzeugs |
Country Status (5)
Country | Link |
---|---|
US (1) | US8669714B2 (de) |
EP (1) | EP2210452B1 (de) |
AT (1) | ATE504191T1 (de) |
DE (2) | DE102007052434A1 (de) |
WO (1) | WO2009056618A2 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3053010A1 (fr) * | 2016-06-28 | 2017-12-29 | Valeo Vision | Systeme d'eclairage pour vehicule ayant un niveau d'intensite lumineuse modulable |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5783909A (en) * | 1997-01-10 | 1998-07-21 | Relume Corporation | Maintaining LED luminous intensity |
EP1479270B1 (de) * | 2002-02-14 | 2006-07-05 | Koninklijke Philips Electronics N.V. | Schaltung um ein leuchtdiodenfeld anzusteuern |
DE10215472B4 (de) | 2002-04-09 | 2007-08-02 | Hella Kgaa Hueck & Co. | Verfahren zum Betrieb einer Beleuchtungseinrichtung für Fahrzeuge mit einer mindestens eine Leuchtdiode aufweisenden Lampenanordnung sowie Beleuchtungseinrichtung für Fahrzeuge |
DE10349553B4 (de) * | 2003-06-25 | 2007-04-19 | Digitallicht Ag | Verfahren und Lichtnetzwerk zur Helligkeitsregelung und dynamischen Farbmischung von LED-Einheiten |
GB2408315B (en) * | 2003-09-18 | 2007-05-16 | Radiant Res Ltd | Illumination control system for light emitters |
US7535443B2 (en) * | 2003-12-22 | 2009-05-19 | Nokia Corporation | Apparatus and method for producing variable intensity of light |
US7095187B2 (en) * | 2004-01-20 | 2006-08-22 | Dialight Corporation | LED strobe light |
WO2005089309A2 (en) * | 2004-03-15 | 2005-09-29 | Color Kinetics Incorporated | Power control methods and apparatus |
DE102004028987A1 (de) | 2004-06-16 | 2006-01-05 | Volkswagen Ag | Verfahren zum Steuern einer Beleuchtungseinheit für ein Fahrzeug und Beleuchtungseinheit für ein Fahrzeug |
US8299987B2 (en) * | 2005-11-10 | 2012-10-30 | Lumastream Canada Ulc | Modulation method and apparatus for dimming and/or colour mixing utilizing LEDs |
US20070138979A1 (en) * | 2005-12-20 | 2007-06-21 | Samsung Electronics Co., Ltd. | LED illumination unit, projection display device using the same, and method of operating LED illumination unit |
PT1984667T (pt) * | 2006-02-10 | 2018-01-03 | Philips Lighting North America Corp | Métodos e aparelho para fornecimento controlado de potência com fator de potência elevado utilizando uma única etapa de comutação por carga |
-
2007
- 2007-11-02 DE DE102007052434A patent/DE102007052434A1/de not_active Withdrawn
-
2008
- 2008-10-31 EP EP08844799A patent/EP2210452B1/de not_active Not-in-force
- 2008-10-31 WO PCT/EP2008/064772 patent/WO2009056618A2/de active Application Filing
- 2008-10-31 US US12/740,589 patent/US8669714B2/en active Active
- 2008-10-31 AT AT08844799T patent/ATE504191T1/de active
- 2008-10-31 DE DE502008003051T patent/DE502008003051D1/de active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2009056618A2 * |
Also Published As
Publication number | Publication date |
---|---|
US20100301750A1 (en) | 2010-12-02 |
DE502008003051D1 (de) | 2011-05-12 |
US8669714B2 (en) | 2014-03-11 |
WO2009056618A3 (de) | 2009-08-27 |
DE102007052434A1 (de) | 2009-05-07 |
WO2009056618A2 (de) | 2009-05-07 |
WO2009056618A4 (de) | 2009-10-22 |
ATE504191T1 (de) | 2011-04-15 |
EP2210452B1 (de) | 2011-03-30 |
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