EP2989858B1 - Circuit à diodes électroluminescentes - Google Patents

Circuit à diodes électroluminescentes Download PDF

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Publication number
EP2989858B1
EP2989858B1 EP14721283.1A EP14721283A EP2989858B1 EP 2989858 B1 EP2989858 B1 EP 2989858B1 EP 14721283 A EP14721283 A EP 14721283A EP 2989858 B1 EP2989858 B1 EP 2989858B1
Authority
EP
European Patent Office
Prior art keywords
led
leds
current
strings
led strings
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.)
Active
Application number
EP14721283.1A
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German (de)
English (en)
Other versions
EP2989858A2 (fr
Inventor
Cristian OLARIU
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.)
Zumtobel Lighting GmbH Austria
Original Assignee
Zumtobel Lighting GmbH Austria
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Application filed by Zumtobel Lighting GmbH Austria filed Critical Zumtobel Lighting GmbH Austria
Publication of EP2989858A2 publication Critical patent/EP2989858A2/fr
Application granted granted Critical
Publication of EP2989858B1 publication Critical patent/EP2989858B1/fr
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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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines

Definitions

  • the present invention relates to an LED circuit arrangement for operating a plurality of LEDs by a common operating device.
  • the invention also relates to a circuit board for fitting with LEDs, by means of which a corresponding LED circuit arrangement can be implemented.
  • LEDs are increasingly replacing classic light sources in modern lighting technology.
  • a large number of different LED types are available, which differ in terms of their performance and in terms of the light emitted or the color or color temperature.
  • a few so-called high-power LEDs or a large number of LEDs can be used with low or medium power can be an advantage.
  • LED operating devices are only available to a limited extent, which in turn requires that, in particular, in the event that a plurality of LEDs are operated with low or medium power these must be interconnected in a suitable manner. It has become established in practice to arrange LEDs in so-called serial-parallel arrays, as shown schematically in FIG Figures 1 and 2 is shown.
  • a single array 310 consists of several LED strings connected in parallel, in each of which the LEDs are connected in series.
  • n parallel LED strings are present, each of which has m LEDs, so that an array 310 consists of n ⁇ m LEDs in total.
  • the operating device 300 then preferably supplying this arrangement with a constant current.
  • a serial-parallel LED array as shown in the Figures 1 and 2 is shown, has certain advantages with regard to the simple structure, the associated low costs and the high efficiency that can be achieved in spite of everything. If identical LEDs are used which have an essentially identical forward voltage, then the current provided by the operating device 300 is evenly distributed over the individual LED strands with only low tolerances. The following relationship applies: I. branch ⁇ I. ballast / n I branch corresponds to the current within an individual LED string, while I ballast corresponds to the constant current made available by the operating device 300.
  • V f_array across the LED array 310
  • V f_ array m ⁇ V f _ LED
  • V f_LED corresponds to the forward voltage of the LEDs
  • a dimmable LED light with adjustable color temperature is shown.
  • the color temperature is achieved by mixing the light emitted by a white LED string as homogeneously as possible with a colored light that is generated by colored LEDs in a further LED string.
  • the further LED string is formed parallel to the white LED string and is also divided into two parallel strings, with one sub-string only containing green LEDs and the other sub-string only containing red LEDs.
  • the other LED string with colored LEDs is also equipped with current regulators in order to keep the current in this string as constant as possible, so that when dimmed, i.e. when the power converted in the LED luminaire is reduced, the proportion of colored light increases, which is warmer The color temperature of the dimmed light.
  • the present invention is therefore based on the object of specifying a new type of solution for operating LEDs, which makes it possible to operate the LEDs of the circuit arrangement with different powers despite the supply of all LEDs by a single operating device. This possibility should also exist especially when identical LEDs are used. Furthermore, a high efficiency should nevertheless be maintained, i.e. the power made available by the operating device should ideally be converted into light almost exclusively by the LEDs.
  • the branching of the strings is such that one or more branched parallel LED strings can branch in sections into a larger number of further parallel LED strings.
  • the branching of the strands is such that regardless of the path along which the current runs from the entry point of the LED circuit arrangement to the end point of the circuit arrangement, an identical number of LEDs is always passed through.
  • an identical number of LEDs is always passed through.
  • compensation resistors can be arranged either in the original, non-branched LED strings or in the branched subsections in order to ensure that the LEDs each have their ideal forward voltage operate. According to the invention, it is also provided in this variant that all LEDs of the circuit arrangement are identical.
  • the second variant according to the invention thus allows LEDs to be operated in a jointly supplied circuit arrangement with different powers in a relatively simple manner and without great effort and the additional costs associated therewith.
  • the circuit arrangements can be used more variably for different lighting purposes.
  • FIG. 3 clarifies the idea underlying the first variant. What is shown here is a circuit arrangement 1 for operating a plurality of LEDs 2, in the following, for the sake of simplicity, it is assumed that the LEDs are identical in each case. If necessary, however, different LED types can also be used in certain branches.
  • the circuit arrangement 1 consists of an LED matrix, generally designated by the reference numeral 10, or an LED array, which is supplied with constant current I ballast from a common operating device 3.
  • the basic structure of the circuit arrangement corresponds to a serial-parallel LED array, ie several parallel-connected LED strings 11 are provided (in the following case n LED strings), in each of which several LEDs 2 are connected in series.
  • n LED strings n LED strings
  • current limiters 15 are arranged in some selected LED strings of the array 10. These can be implemented in different ways, as will be described in more detail later. Their function is to limit the current flow to a certain value in the respective LED string.
  • the current limiters 15 are designed in such a way that they can each set the current individually for the corresponding strand 11.
  • V f _ array m ⁇ V f _ LED
  • the current limiters 15 are each implemented by resistors R 1 to R j . Since the forward voltage across the LEDs 2 varies only very slightly with the flow of current, corresponding resistors, which are connected in series with the LEDs 2 of the corresponding string, mean that the current is set almost constantly to a desired value.
  • this very simple embodiment has the disadvantage that there may still be a small fluctuation in the currents, which may not be acceptable with regard to the corresponding area of application and is outside a certain tolerance limit, since the forward voltage of the LEDs 2 to a certain extent depends on the Operating parameters such as current or temperature is dependent. Inherent intolerances in the manufacturing process of LEDs also lead to a certain fluctuation in the current flow.
  • a current limiter as shown in FIG Figure 4 will be realized.
  • a current path 11 1 is shown here, as well as a current path 11 2 with a configured, more complex current limiter 15 below it.
  • it consists of two transistors and two resistors, which are connected to form what is known as a constant current sink.
  • the transistor Q2 controls the transistor Q1 in order to force a constant current flow through the LED cluster 11 2.
  • the value of the set current is determined by the resistor R1, the resistor R2 is used to bias the transistor Q1.
  • an n-channel MOSFET transistor could also be used instead of the bipolar transistor Q1 shown, and the transistor Q2 could in turn be replaced by two diodes.
  • the principle Variants for realizing a current limiter are conceivable in which the current flow no longer depends on the supply voltage of the LEDs and can accordingly be set exactly to a desired value.
  • Figure 5 shows the basic principle on which the invention is based, again initially starting from a classic serial-parallel LED array, which in the upper area of Figure 5 is shown and has k parallel LED strings 11, each with m LEDs 2.
  • the second principle according to the invention now provides that at least some of the original LED strings 11 branch off in sections into a different number of parallel LED strings 21.
  • This concept is in the lower half of Figure 5 recognizable, wherein in this case the k input-side LED strings 11 branch in their central area into i serial-parallel LED strings 21, so that here the above-mentioned sub-array is formed 20.
  • the number of branched strands i is greater than the original number k, the number j of the serial LEDs located in the branched strands 21 being identical in each case, independent of the degree of branching, and corresponding to the corresponding original number.
  • the number of LEDs in series is therefore always constant regardless of the corresponding path.
  • I. nested_ branch ⁇ I. branch ⁇ k / i I branch denotes the current flow before the branch.
  • the prerequisite for this is that - as already mentioned - the number of branched strands i is greater than the number of original strands k, i.e. i> k and the sub-array 20 extends only over a section of the entire arrangement, i.e. 1 ⁇ j ⁇ m.
  • the total flow of current in the LED strings before they branch is therefore almost evenly divided between the branched strands after the branch point 7.
  • the current flow through the newly integrated sub-array 20 can be reduced to a different current value than in the non-branched areas or non-branched LED strings Ratio of the current values can be set. In the areas adjoining the sub-array 20, the current flow then corresponds again to the original value.
  • the forward voltage of an LED depends on the level of the corresponding current flow through it, the forward voltage increasing with increasing current flow. Furthermore, there is also a temperature dependency, an increase in temperature in turn leading to a reduction in the forward voltage.
  • the lower currents in the sub-arrays 20 thus in turn lead to lower LED temperatures. Normally, the effect of reducing the forward voltage due to the lower current flow is greater than the increase due to the temperature drop. This has the consequence that in the branches of a sub-array 20 the forward voltages at the LEDs will be slightly lower than in the non-branched areas, that is to say V f _ LED I. branch , T LED _ OSP ⁇ V f _ LED I. nested _ branch , T LED _ E.G
  • T LED_OSP represents the temperature of the LEDs before branching point 7 and after junction point 8
  • T LED_BSP describes the temperature of the LEDs after branching point or in sub-array 20.
  • compensation resistors are therefore preferably used, especially if not all strings of the original LED array were branched in the same way.
  • These resistors 25 are dimensioned in such a way that they compensate for the difference in the forward voltage in the area of the sub-array 20.
  • the compensation resistors 25 can be arranged both before the branching point and after the point at which the branched strands are brought together again. The above relationship applies in both cases.
  • the use of the compensation resistors 25 is necessary here in particular if only some of the LED strings of the array are branched in the manner according to the invention. In contrast, in the event that all branches are branched in the same way, no compensation is required since the array 10 is automatically balanced, ie the forward voltage is identical regardless of the path of the current flow.
  • FIGS 8a to 8e finally show some conceivable possibilities for implementing the inventive idea of the embedded sub-arrays, it being conceivable that LED strings that are well branched can be branched further at a later point in order to form a cascade. LED strings can also be brought together (see Figure 8c ), which corresponds to an inverse branching, but has no influence on the inventive effect of the different power supply.
  • the resulting current flows in particular in relation to the overall constant current supplied to the arrangement, which is made available by the supply device, are shown in the figures, whereby it can be seen that the idea of branching thus provides the possibility of increasing the current flow to decrease a value corresponding to a rational fraction of the original current value in an unbranched section.
  • both the first circuit arrangement and the second circuit arrangement according to the invention offer the possibility of operating LEDs with different powers despite a common power supply. This then opens up the possibility of using the LEDs, each with a different power, for different tasks. For example, those LEDs that are operated with reduced power can be used to implement indirect lighting and / or accent light, while, on the other hand, the LEDs with maximum power are used for direct lighting.
  • the arrangement of the LEDs within the circuit arrangement according to the invention says nothing about their position, for example within a light.
  • those LEDs that are operated with a different current, i.e. a different power can be placed in the luminaire in such a way that, for example, their light output is opposite to the light output of the other LEDs, despite the fact that they are part of a common circuit arrangement.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)

Claims (6)

  1. Circuit à diodes électroluminescentes (1) pourvu de plusieurs faisceaux de diodes électroluminescentes (11) connectés en parallèle, lesquels sont destinés à être alimentés par un dispositif de fonctionnement (3) commun,
    un ou plusieurs faisceaux de diodes électroluminescentes (11) se ramifiant par sections en un plus grand ou un plus petit nombre de faisceaux de diodes électroluminescentes (21) parallèles
    caractérisé en ce
    que la ramification des faisceaux de diodes électroluminescentes est telle que, quel que soit le chemin le long duquel le courant passe d'un point d'entrée à un point de sortie du circuit à diodes électroluminescentes (1), un nombre identique de diodes électroluminescentes (2) est toujours traversé,
    toutes les diodes électroluminescentes (2) étant sensiblement identiques.
  2. Circuit à diodes électroluminescentes selon la revendication 1,
    caractérisé en ce
    qu'un ou plusieurs faisceaux de diodes électroluminescentes (21) parallèles se ramifient par sections en un plus grand nombre d'autres faisceaux de diodes électroluminescentes parallèles.
  3. Circuit à diodes électroluminescentes selon la revendication 2,
    caractérisé en ce
    que le plus grand nombre d'autres faisceaux de diodes électroluminescentes parallèles se réunissent à leur tour pour former un ou plusieurs faisceaux de diodes électroluminescentes (21) parallèles, le nombre de faisceaux de diodes électroluminescentes (21) réunis correspondant à un nombre d'origine de faisceaux de diodes électroluminescentes (21) avant la ramification.
  4. Circuit à diodes électroluminescentes selon l'une quelconque des revendications précédentes,
    caractérisé en ce
    que ledit circuit comporte des résistances de compensation (25) qui sont disposées dans les zones non ramifiées ou dans les zones ramifiées.
  5. Système d'éclairage doté d'un dispositif de fonctionnement (3) ainsi que d'un circuit à diodes électroluminescentes (1) selon l'une quelconque des revendications précédentes alimenté par le dispositif de fonctionnement (3).
  6. Platine de montage de diodes électroluminescentes comportant des emplacements de montage de diodes électroluminescentes, qui sont connectées les unes aux autres via des lignes conductrices de telle manière qu'il en résulte un circuit à diodes électroluminescentes selon l'une quelconque des revendications 1 à 4.
EP14721283.1A 2013-04-25 2014-04-22 Circuit à diodes électroluminescentes Active EP2989858B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202013101793.0U DE202013101793U1 (de) 2013-04-25 2013-04-25 LED-Schaltungsanordnung
PCT/EP2014/058104 WO2014173879A2 (fr) 2013-04-25 2014-04-22 Circuit à diodes électroluminescentes

Publications (2)

Publication Number Publication Date
EP2989858A2 EP2989858A2 (fr) 2016-03-02
EP2989858B1 true EP2989858B1 (fr) 2021-03-10

Family

ID=50639466

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14721283.1A Active EP2989858B1 (fr) 2013-04-25 2014-04-22 Circuit à diodes électroluminescentes

Country Status (3)

Country Link
EP (1) EP2989858B1 (fr)
DE (1) DE202013101793U1 (fr)
WO (1) WO2014173879A2 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008130377A (ja) * 2006-11-21 2008-06-05 Matsushita Electric Works Ltd Ｌｅｄ点灯回路およびそれを用いる照明器具
US20130063035A1 (en) * 2011-09-12 2013-03-14 Juno Manufacturing, LLC Dimmable led light fixture having adjustable color temperature

Family Cites Families (14)

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Publication number Priority date Publication date Assignee Title
FR2707223B1 (fr) * 1993-07-07 1995-09-29 Valeo Vision Feu de signalisation perfectionné à diodes électroluminescentes.
TR199900917T2 (xx) * 1996-11-12 1999-07-21 L.F.D. Limited Lamba
TWI479466B (zh) * 2005-05-25 2015-04-01 Koninkl Philips Electronics Nv 通量補償發光二極體驅動系統及方法
US8106604B2 (en) * 2008-03-12 2012-01-31 Freescale Semiconductor, Inc. LED driver with dynamic power management
US8035307B2 (en) * 2008-11-03 2011-10-11 Gt Biomescilt Light Limited AC to DC LED illumination devices, systems and methods
US8044609B2 (en) * 2008-12-31 2011-10-25 02Micro Inc Circuits and methods for controlling LCD backlights
KR100930813B1 (ko) * 2009-03-09 2009-12-09 이동원 능동형 정전력 공급장치
TW201107916A (en) * 2009-08-24 2011-03-01 Novatek Microelectronics Corp Light emitting device capable of dynamically regulating output voltage and related control method
US8084960B2 (en) * 2009-12-30 2011-12-27 O2Micro, Inc Circuits and methods for powering light source with balanced currents
CN102264173B (zh) * 2010-05-31 2013-11-06 英飞特电子（杭州）股份有限公司 Led恒流驱动电路及输出电压可调电路
US8766546B2 (en) * 2011-06-06 2014-07-01 Tdk-Lambda Corporation LED drive device and LED illuminating device
US20130193851A1 (en) * 2012-01-26 2013-08-01 Vishay Dale Electronics, Inc. Integrated Circuit Element and Electronic Circuit for Light Emitting Diode Applications
US8878443B2 (en) * 2012-04-11 2014-11-04 Osram Sylvania Inc. Color correlated temperature correction for LED strings
DE102012206888A1 (de) * 2012-04-26 2013-10-31 Zumtobel Lighting Gmbh LED-Anordnung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008130377A (ja) * 2006-11-21 2008-06-05 Matsushita Electric Works Ltd Ｌｅｄ点灯回路およびそれを用いる照明器具
US20130063035A1 (en) * 2011-09-12 2013-03-14 Juno Manufacturing, LLC Dimmable led light fixture having adjustable color temperature

Also Published As

Publication number Publication date
EP2989858A2 (fr) 2016-03-02
DE202013101793U1 (de) 2014-07-29
WO2014173879A2 (fr) 2014-10-30
WO2014173879A3 (fr) 2015-04-09

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