EP1349434A2 - Beleuchtungsschaltkreis, insbesondere für Kraftfahrzeuge - Google Patents
Beleuchtungsschaltkreis, insbesondere für Kraftfahrzeuge Download PDFInfo
- Publication number
- EP1349434A2 EP1349434A2 EP03100572A EP03100572A EP1349434A2 EP 1349434 A2 EP1349434 A2 EP 1349434A2 EP 03100572 A EP03100572 A EP 03100572A EP 03100572 A EP03100572 A EP 03100572A EP 1349434 A2 EP1349434 A2 EP 1349434A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- series
- led
- light
- lighting circuit
- connection
- 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
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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]
- H05B45/40—Details of LED load circuits
Definitions
- the invention relates to a lighting circuit, in particular for motor vehicles.
- Such lighting circuits are increasingly being built up with light-emitting diodes as illuminants.
- illuminants light-emitting diodes
- a different number of LEDs is required. This raises the question of the circuit arrangement in which the LEDs are arranged.
- a series connection of all LEDs would have the disadvantage that if one LED fails, all LEDs would fail.
- a compromise between these two extremes is a combined series / parallel connection in which the series connected in parallel are networked with one another to form a light-emitting diode matrix.
- Such a light-emitting diode matrix consists of n rows connected in parallel, each with m strings connected in series, a light-emitting diode being arranged in each strand and an electrically conductive cross-connection running between the strings of each row to the adjacent rows.
- the cross connections ensure that if one LED fails, the other LEDs continue to be supplied with power and can continue to light up.
- Such a light-emitting diode matrix for motor vehicles is known, for example, from EP 0896 899A2.
- the cross connections between the rows are realized by cables or conductor tracks, whose ohmic resistance is negligibly small.
- LEDs be uniformly bright glow so that a homogeneous lighting impression is created.
- a light-emitting diode matrix is preferably only fitted with LEDs which are in the same Voltage class are, the voltage class being within the range of values of the permissible Relates to foot tensions.
- the LEDs of a voltage class also differ with regard to their diode characteristic within a tolerance range. This leads to the fact that unfavorable constellations the currents through the different strands of the LED matrix can be very different; in extreme cases they can look around distinguish the factor 2 and more. This in turn has an undesirable effect different brightnesses. In addition, this can lead to the rated currents certain LEDs in the light-emitting diode matrix are clearly exceeded, which is negative affects the life of the LEDs.
- each LED is proposed in EP 0 793 402 B1 assign a resistor to a string in series. This will create a similar linearization of different LED characteristics achieved and thus overall an even current distribution across the different strings / LEDs.
- the large number of resistors that is needed, however, is problematic because it involves high component and Assembly costs are connected. It is also for the multitude of resistors additional installation space required.
- Another problem is that over the in series switched resistors each drop a voltage that is a thermal power loss generated. The thermal power loss reduces the efficiency of the Light generation and on the other hand cause by the thermal power loss generated high temperatures an increased degradation of the LEDs.
- the object of the invention is to provide a lighting circuit for an LED matrix create, which overcomes the disadvantages listed above.
- FIG. 1 shows an LED matrix according to the prior art according to EP 0896 899A2 shown. It consists of a combined series / parallel connection with two rows each have 3 strands. There is an LED in each strand. Between Strands of each row an electrically conductive connection is arranged, the ohmic resistance is practically zero.
- the LED matrix is over a series resistor (Rv) connected to the supply voltage.
- a protective diode serves as reverse polarity protection.
- FIG. 2 shows an LED matrix according to the prior art according to EP 0793 402 B1 shown. A series resistor of an LED is connected in series in each line.
- FIG. 3 shows a lighting circuit with a 6-LED matrix, as in FIG. 1, however is a transverse resistance according to the invention in the cross connections between the strands built-in.
- the effect achieved according to the invention, which is achieved with the transverse resistances is explained with reference to Figures 7 and 8.
- the characteristic curves for the LED are shown in FIG with the number 4 and the LED with the number 3.
- the LED with the number 4 should Have a forward voltage at the bottom of the tolerance range of a voltage class lies, while the forward voltage of the LED with the number 3 is at the upper edge.
- the forward voltages of the other LEDs (1, 2, 5, 6) are the same and are in the middle of the Tolerance band.
- the nominal current of the LEDs is 50 m ampere.
- This current difference causes a different brightness of the LEDs and causes permanent degradation of the LEDs.
- With increasing transverse resistance the current difference then decreases, the currents approaching the nominal current. From The currents then approximated the nominal current at a maximum of approx. 80 ⁇ .
- the LED matrix is over series resistors connected to the supply voltage (Vcc). It can be the number of in a row LEDs connected in series are selected according to the forward voltage (approx. 2 to 3V) be that the voltage drop across all LEDs connected in series (Functional voltage limit) as close as possible to the lower limit of the Supply voltage is approaching. In a motor vehicle, the supply voltage decrease from 14 volts to 9 volts in the short term.
- the serves Series resistor to adjust the current that flows into the LED matrix. To the To distribute power loss evenly, preferably two or more in parallel switched series resistors (Rv) provided.
- the LED matrix In contrast to the lighting circuit according to EP 0 793 402 B1, where the Series resistors are also arranged in the LED matrix in series with the LEDs, can the LED matrix with the thermal in the lighting circuit according to the invention lightly loaded transverse resistances in the housing of a luminous element (e.g. headlights or rear light), while the series resistor or resistors outside the Housing can be arranged. This eliminates the annoying heat loss from the inside kept away from the housing.
- these are Series resistors included in the housing as part of the LED matrix.
- the equalizing currents independent of the load current through the LEDs.
- the LED matrix is a Constant current source, which is a constant regardless of voltage fluctuations Provides electricity.
- a low, optimal to the Functional voltage limit adapted supply voltage can be selected because the Voltage drop across the series resistors in the strands according to EP 0 793 402 B1 is eliminated.
- Figure 4 is the embodiment of a lighting circuit with a 9 LED matrix consisting of 3 rows connected in parallel, each with three strands. It is between the first and the second strand of the first row and between the first and a transverse resistor is arranged in the second strand of the second row. Likewise, between the first and the second strand of the second row and between the first and the a second resistor in the third row of the third row is arranged. Appropriate Cross resistances are also found between the second and third strands of each neighboring rows.
- the lighting circuit according to Figure 4 is analogous to Illumination circuit according to FIG. 3. In contrast to FIG.
- the shunt resistors are connected at one end to a common star account point and at the other end to a row in the area between two strands.
- this star connection is shown again for clarification alone. The use of such a star connection allows greater design freedom in the layout of the circuit board on which the LED matrix is arranged.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
- Audible And Visible Signals (AREA)
Abstract
Description
- Figur 1
- eine LED-Matrix gemäß dem Stand der Technik nach EP 0896 899A2,
- Figur 2
- eine LED-Matrix gemäß dem Stand der Technik nach EP 0793 402 B1,
- Figur 3
- eine erfindungsgemäße LED-Matrix gemäß einer ersten Ausführungsform,
- Figur 4
- eine erfindungsgemäße LED-Matrix gemäß einer zweiten Ausführungsform,
- Figur 5
- eine erfindungsgemäße LED-Matrix gemäß einer dritten Ausführungsform,
- Figur 6
- eine Widerstandssternschaltung, wie sie gemäß Ausführungsform von Figur 5 verwendet wird,
- Figur 7
- den Kennlinienverlauf zweier LEDs mit unterschiedlichen Flußspannungen,
- Figur 8
- den Einfluß des Querwiderstands auf eine gleichmäßige Stromverteilung.
Claims (5)
- Beleuchtungsschaltkreis, insbesondere für Kraftfahrzeuge, mit einer Leuchtdiodenmatrix in kombinierter Reihen-/Parallelschaltung, die durch einen Versorgungsstromkreis mit einer Gleichspannung und/oder einem Konstantstrom versorgt wird, wobei die Leuchtdiodenmatrix aus n parallelgeschalteten Reihen mit jeweils m hintereinandergeschalteten Strängen besteht, wobei in jedem Strang eine Leuchtdiode angeordnet ist, wobei zwischen den Strängen jeweils einer Reihe eine elektrisch leitende Querverbindung zu den jeweils benachbarten Reihen verläuft,
dadurch gekennzeichnet, daß
in mindestens einer Querverbindung mindestens ein Querwiderstand angeordnet ist. - Beleuchtungsschaltkreis nach Anspruch 1,
dadurch gekennzeichnet, daß
im Fall von drei oder mehr parallel geschalteten Reihen zwischen mindestens einem ersten Strang und einem zweiten Strang der ersten Reihe und zwischen dem zugehörigen ersten und zweiten Strang der letzten Reihe eine Querverbindung mit mindestens einem Widerstand angeordnet ist. - Beleuchtungsschaltkreis nach Anspruch 2,
dadurch gekennzeichnet, daß
mindestens eine Sternschaltung aus m Querwiderständen vorgesehen ist, wobei die Querwiderstände mit ihrem einen Ende jeweils mit einem gemeinsamen Sternkontenpunkt verbunden sind und mit ihrem jeweils anderen Ende jeweils mit einer Reihe im Bereich zwischen zwei Strängen verbunden sind. - Beleuchtungsschaltkreis nach einem der vorstehenden Ansprüche,
dadurch gekennzeichnet, daß
in Reihe zur Leuchtdiodenmatrix mindestens ein Vorwiderstand geschaltet ist. - Beleuchtungsschaltkreis nach Anspruch 4,
dadurch gekennzeichnet, daß
die Leuchtdiodenmatrix mit den Querwiderständen in dem Gehäuse eines Leuchtkörpers untergebracht ist, während der mindestens eine Vorwiderstand außerhalb des Gehäuses untergebracht ist.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10214423 | 2002-03-30 | ||
| DE10214423A DE10214423A1 (de) | 2002-03-30 | 2002-03-30 | Beleuchtungsschaltkreis, insbesondere für Kraftfahrzeuge |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1349434A2 true EP1349434A2 (de) | 2003-10-01 |
| EP1349434A3 EP1349434A3 (de) | 2005-08-17 |
| EP1349434B1 EP1349434B1 (de) | 2007-04-25 |
Family
ID=27798266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03100572A Expired - Lifetime EP1349434B1 (de) | 2002-03-30 | 2003-03-07 | Beleuchtungsschaltkreis, insbesondere für Kraftfahrzeuge |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1349434B1 (de) |
| DE (2) | DE10214423A1 (de) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008000209A1 (de) * | 2006-06-29 | 2008-01-03 | Osram Opto Semiconductors Gmbh | Beleuchtungseinrichtung |
| EP1871146A4 (de) * | 2005-02-25 | 2009-04-29 | Murata Manufacturing Co | Led-beleuchtungsvorrichtung |
| US7631559B2 (en) | 2005-04-06 | 2009-12-15 | Murata Manufacturing Co., Ltd. | Acceleration sensor |
| TWI413453B (zh) * | 2008-11-20 | 2013-10-21 | Epistar Corp | 交流發光二極體裝置 |
| EP4395463A1 (de) * | 2023-01-02 | 2024-07-03 | Valeo Vision | Leuchtvorrichtung für kraftfahrzeuge |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4094477B2 (ja) | 2003-04-28 | 2008-06-04 | 株式会社小糸製作所 | 車両用灯具 |
| DE102005053298B4 (de) * | 2005-11-09 | 2012-08-16 | Kromberg & Schubert Kg | Beleuchtungseinrichtung |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5457450A (en) * | 1993-04-29 | 1995-10-10 | R & M Deese Inc. | LED traffic signal light with automatic low-line voltage compensating circuit |
| FR2745459B1 (fr) * | 1996-02-28 | 1998-04-10 | Valeo Electronique | Circuit d'illumination a diodes electroluminescentes, notamment pour vehicules automobiles, feu de signalisation, et tableau de commande, l'incorporant |
| DE19734750C2 (de) * | 1997-08-12 | 2003-04-30 | Reitter & Schefenacker Gmbh | Heckleuchte von Kraftfahrzeugen |
| DE19835159C2 (de) * | 1998-08-04 | 2001-08-02 | Agfa Gevaert Ag | Vorrichtung zum Belichten von fotografischem Aufzeichnungsmaterial |
| US6288497B1 (en) * | 2000-03-24 | 2001-09-11 | Philips Electronics North America Corporation | Matrix structure based LED array for illumination |
-
2002
- 2002-03-30 DE DE10214423A patent/DE10214423A1/de not_active Withdrawn
-
2003
- 2003-03-07 EP EP03100572A patent/EP1349434B1/de not_active Expired - Lifetime
- 2003-03-07 DE DE50307113T patent/DE50307113D1/de not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1871146A4 (de) * | 2005-02-25 | 2009-04-29 | Murata Manufacturing Co | Led-beleuchtungsvorrichtung |
| US7631559B2 (en) | 2005-04-06 | 2009-12-15 | Murata Manufacturing Co., Ltd. | Acceleration sensor |
| WO2008000209A1 (de) * | 2006-06-29 | 2008-01-03 | Osram Opto Semiconductors Gmbh | Beleuchtungseinrichtung |
| TWI413453B (zh) * | 2008-11-20 | 2013-10-21 | Epistar Corp | 交流發光二極體裝置 |
| EP4395463A1 (de) * | 2023-01-02 | 2024-07-03 | Valeo Vision | Leuchtvorrichtung für kraftfahrzeuge |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10214423A1 (de) | 2003-10-09 |
| EP1349434A3 (de) | 2005-08-17 |
| DE50307113D1 (de) | 2007-06-06 |
| EP1349434B1 (de) | 2007-04-25 |
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