EP2656687A1 - Appareil de commande de del - Google Patents

Appareil de commande de del

Info

Publication number
EP2656687A1
EP2656687A1 EP11802418.1A EP11802418A EP2656687A1 EP 2656687 A1 EP2656687 A1 EP 2656687A1 EP 11802418 A EP11802418 A EP 11802418A EP 2656687 A1 EP2656687 A1 EP 2656687A1
Authority
EP
European Patent Office
Prior art keywords
led
arrangement
bypass
current
ledi
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
Application number
EP11802418.1A
Other languages
German (de)
English (en)
Other versions
EP2656687B1 (fr
Inventor
Thomas Kremer
Günter Schreyer
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.)
Bag Electronics GmbH
Original Assignee
BAG Engineering GmbH
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 BAG Engineering GmbH filed Critical BAG Engineering GmbH
Publication of EP2656687A1 publication Critical patent/EP2656687A1/fr
Application granted granted Critical
Publication of EP2656687B1 publication Critical patent/EP2656687B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices

Definitions

  • the invention relates to an LED operating arrangement for
  • a plurality of serially connected LED arrays wherein the LED arrays each have a first and a second terminal, and the series circuit of the LED arrays is connected to a supply voltage, and wherein a plurality of LED arrays are each assigned a bypass arrangement in such a way in that in each case one bypass connection of the bypass arrangement is connected to one connection of the LED arrangement, and the respective bypass arrangement furthermore has at least one control connection and, in one operating state, bridges the associated LED arrangement.
  • the invention further relates to a method for operating such an LED operating arrangement.
  • Such a generic LED operating arrangement is particularly suitable for a supply with changing supply voltage, for example when supplied via a commercial AC source.
  • Such an LED operating arrangement is described for example in the published patent application DE 10 2007 041 131 AI.
  • the applied supply voltage is compared with respectively predetermined threshold values and, depending on the result, the respective bypass arrangement for bridging the associated LED arrangement or for Locks activated.
  • the series-connected LED arrays are thus switched on successively, so that a comparatively efficient conversion of the electrical energy into light radiation is achieved.
  • the electronic components for determining the respective reference voltages as, as well as the light-emitting diodes used subject to manufacturing due to scattering their electronic properties. are, for example in the case of the LEDs with respect to the respective forward voltage, the temperature behavior and / or the change of these quantities with the aging of the component. For this reason, security areas must be provided in the design of such circuits with respect to these parameters, which is associated with additional power losses in the circuit, which ultimately limits the efficiency.
  • the invention has for its object to improve the efficiency of generic LED operating arrangements.
  • a control connection of a respective bypass arrangement is connected to an associated current sensor which is designed to detect a current flow through an LED arrangement, which is arranged adjacent to the LED arrangement, which is associated with the respective bypass arrangement, wherein the respective bypass arrangement is further formed as a controllable resistor.
  • a bypass arrangement to an LED arrangement makes it possible that the respective LED arrangement can be bridged by the associated bypass arrangement, insofar as are connections or inputs and outputs of the bypass arrangement parallel to the associated LED array or parallel to a series circuit, which includes at least the associated LED array, but possibly also other components such as an associated current sensor for the bypass arrangement.
  • the term "adjacent” refers to two consecutive LED arrays in series with respect to two LED arrays, regardless of whether there are other components such as a current sensor or a current or voltage source in series between these two LED arrays
  • the adjacent two LED arrays may, for example, be arranged downstream of each other in the series circuit.
  • the respective bypass arrays are designed as controllable resistors and / or controllable current sources, in addition to the states a) conductive, ie bridging the associated LED array and b) barrier, ie the respective associated LED array not bridging and other intermediate states are adjustable in operation, such that, for example, a total current can be composed by an LED array by a n current component, which flows through an adjacent LED array and by a current component, which flows through a bypass arrangement, which is associated with the adjacent LED array.
  • An LED arrangement may comprise a single LED, but also several LEDs, in particular in a series connection.
  • LED or light-emitting diode is here understood very broadly and generally includes light-emitting electronic components, in particular organic LEDs.
  • a current control of the respective bypass arrangement is realized by means of a respective current sensor, manufacturing tolerances of electrical properties of the components, in particular the respective LEDs, such as forward voltage, temperature behavior and change of these parameters can be automatically taken into account by aging during operation.
  • the safety designs described above for generic LED operating arrangements are unnecessary, so that ultimately the efficiency of the LED operating arrangement according to the invention can be further improved compared to the conventional arrangements.
  • the harmonic content of the current flowing through the series arrangement of the LED arrays current is reduced.
  • bypass arrangements suitably comprise their own current sensors assigned to each, so that, in particular, the attainment of the respective forward voltage of the associated LED arrangement can be determined.
  • At least several, preferably (n-1) of the n LED arrays or also all of the n LED arrays may be assigned a bypass arrangement as described above.
  • the current sensor associated with the respective bypass arrangement is configured to detect current flow through an LED array disposed downstream downstream of the LED array associated with the respective bypass arrangement.
  • This design measure can be measured via the current sensor of the instantaneous current, which is passed through the bypass arrangement, as well as the current component, which flows through the bypass arrangement associated with the LED array, and used for the control of the bypass arrangement.
  • the respective current sensor comprises a bypass arrangement.
  • at least one resistor in particular, the current sensor may be formed as a single resistor.
  • the current to be detected is passed through the current sensor, the resulting voltage drop can be provided as a control signal, the associated bypass arrangement.
  • the respective current sensor can also be designed as a resistor network, in particular as a parallel connection of resistors.
  • bypass arrangements associated current sensor are provided, which are expediently arranged in each case in series with the series-connected LED arrays.
  • the respective current sensor in particular the respective resistor arrangement, to be provided in series between the two adjacent LED arrangements.
  • one terminal of the respective current sensor is connected to a control terminal of the associated bypass arrangement and another terminal of the respective current sensor is connected to a bypass terminal of the associated bypass arrangement.
  • a bypass connection of a bypass arrangement can directly without an interconnection via other components with a first terminal of the associated LED array and another bypass terminal of the bypass arrangement can be connected via a current sensor to a second terminal of the associated LED arrangement, wherein this current sensor can be arranged in a series circuit of LED arrangements and current sensors.
  • the first and second bypass connections of a bypass arrangement can each be connected directly to an associated connection of the associated LED arrangement directly without an interconnection via other components.
  • First and second terminals of the associated LED array may be the two supply terminals of the LED arrays.
  • the two bypass connections can be the bypass input and the. Represent as bypass output, as explained between see input and output of the bypass arrangement next to a.
  • Short circuit and a complete blockage and intermediate states are adjustable, in particular those of a controllable resistor and / or a controllable current source.
  • One or more of the bypass arrangements described may or may also include more than a single control input. In this case, multiple signals are used to control the bypass arrangements.
  • at least one of the plurality comprises
  • a self-conducting transistor such as an FET
  • such a bypass arrangement may be formed substantially as a self-conducting transistor.
  • a bypass arrangement it is also possible for a bypass arrangement to comprise a self-blocking transistor, in particular as a self-blocking transistor.
  • resistors or interconnected resistors as current sensors in the series connection together with the LED Arrangements are provided, these can be dimensioned at an alternating supply voltage as in a sinusoidal AC voltage for adjusting the supply current to this supply voltage, in particular in order to optimize the efficiency and harmonic content of the .LED operating arrangement.
  • the accuracy of such an adaptation generally increases with the number of LED arrays which are each assigned a bypass arrangement.
  • bypass arrangements can be connected in series, ie the input of a bypass arrangement is connected to an output of an adjacent bypass arrangement, wherein several, in particular all bypass arrangements can be connected in series in this way.
  • a current limiting device can be provided which can be provided between the supply voltage terminals of the LED operating arrangement and in series with the series connection of the LED arrangements or within this series connection.
  • the LED operating arrangement expediently has an AC voltage-fed rectifier for providing a pulsating DC voltage supply with which the series connection of the LED arrangements can be fed.
  • a pulsating DC voltage supply the resistance values of the current sensors or resistors connected in series with the LED arrangements for adapting the time profile of the flow through the series connection of the LED arrangements to the temporal chen course of pulsating DC voltage can be adjusted.
  • one or more, in particular all, bypass arrangements have at least one further control terminal which scans the cathode voltage of the LED arrangement, which is arranged adjacent to the assigned LED array of the bypass arrangement downstream of it.
  • Both control signals may e.g. be guided via respective series resistors in parallel to the gate of the respective transistor of the bypass arrangement.
  • a further signal that depends on the forward voltage of the downstream adjacent LED array is used to control the bypass arrangement, can be a performance optimization for the last-mentioned LED array perform.
  • the above-described problem is solved with a method for operating a plurality of serially connected LED arrangements, wherein the LED arrangements each have a first and a second terminal and this series connection is connected to a supply voltage and wherein a plurality of LED arrangements each bypass arrangement is assigned such that in each case a bypass terminal of the bypass arrangement is connected to a terminal of the LED array, wherein the bypass arrangement further comprises at least one control terminal and in an operating state, the associated LED arrangement is bridged.
  • the inventive method is characterized in that a respective bypass arrangement is controlled by the instantaneous value of the current flowing through an LED array, which is provided adjacent to the LED array, which is associated with the respective bypass arrangement, and wherein the instantaneous value of this current, the bypass arrangement as a controllable resistor and / or as controllable power source is controlled.
  • an LED array can be bridged by means of their associated bypass arrangement.
  • the control of the bypass arrangement is effected by means of the detection of the instantaneous value of a current flow through an LED arrangement, which follows in the series connection of the LED arrangements on the LED arrangement, which is assigned to this .Bypassanice.
  • the described control of a bypass arrangement takes place in the case of several of the included bypass arrangements,. especially in all bypass arrangements., Which are each associated with an LED arrangement.
  • the sum of the current flowing through an LED arrangement and the current bridged by the bypass arrangement assigned to this LED arrangement is expediently detected by means of a respective current sensor, the respective bypass arrangement being controlled by an output signal of this current sensor.
  • a bypass arrangement is operated as a controllable resistor with increasing supply voltage initially in the bridged state, in which the associated LED array is bridged, with increasing current flow through the downstream LED array, the resistance of the bypass arrangement is increased to a predetermined limit current through the downstream arranged LED arrangement is achieved.
  • the respective bypass arrangement at further.
  • increasing supply voltage of the current flowing through the bypass means current is kept substantially constant and an increasing voltage at the bypass device drops until the specific forward voltage of the associated LED array is achieved.
  • This forward voltage represents the threshold voltage from which the LED array passes.
  • the resistance of the bypass arrangement is just controlled in this phase of operation insofar that the current flowing through the bypass device is approximately constant. Also by this method step, the time profile of the current flowing through the LED arrays current can be adjusted to the time course of the supply voltage to increase the efficiency.
  • LED array increases with increasing supply voltage by increasing current flow through this LED array, so that the current flow : is reduced by the bypass arrangement.
  • FIG. 2 shows the LED shown in FIG.
  • 3a, b show the time course of different voltage or current quantities within the LED arrangement according to FIG. 2 shows the time profile of the individual currents through the respective LED arrangements in an LED operating arrangement according to FIG. 2 with six LED arrangements, the temporal course of the LED operating arrangement according to FIG. 2 with six LED arrangements applied pulsating
  • FIG. 8 a, b show the time profile of various current and voltage variables within the LED operating arrangement according to FIG. 7, and FIG. 9 shows, in comparison, the time profile of the total current through the LEDs over a network period for the embodiments illustrated in FIGS. 2 and 7 for six LED arrangements connected in series.
  • FIG. 1 shows a schematic diagram of the basic structure of an LED operating arrangement according to the invention.
  • This has two network connections, via which the arrangement 1 is supplied with an AC voltage, which is converted via a rectifier 10 into a pulsating DC voltage with the voltage VGL.
  • This voltage is applied to a series circuit of n LED arrays, each having a specific forward voltage.
  • these LED arrangements may comprise one or more LEDs, in particular a plurality of LEDs in a row arrangement.
  • the n LED arrays have the same structure but, in particular, have slightly different forward voltages due to the unavoidable production spreads, i. at slightly different voltages pass into the conductive state.
  • a current limiter 110 is also provided, which limits the total current through the circuit.
  • the second LED arrangement LED2 and each further upstream LED arrangement up to the last arrangement LEDn has an associated bypass arrangement 20a to 20 (n-1) which, depending on the operating situation, bridges the associated LED arrangement.
  • the Bypass arrangement 20a is associated with the LED2, ie, depending on the operating situation, the bypass arrangement 20a bridges the LED arrangement LED2.
  • a terminal AI is connected via the current sensor 100b to the anode of the LED array LED2, the terminal A2 is coupled directly to the cathode of the LED array LED2.
  • a respective current sensor 100a to 100 (n-1) is provided between two LED arrays, these current sensors thus also lie in series with the serially connected LED arrays and together with them form a series circuit.
  • the output of each current sensor 100a to 100 (n-1) is connected to the control input S of the respective bypass arrangement.
  • the respective current sensor detects a summation current which is composed by the current through an LED arrangement and the current which flows through the bypass arrangement assigned to this LED arrangement, ie is bridged.
  • the current sensor 100a measures, for example, which is composed by the current through the arrangement LED2 and bridged through the terminals Al, A2 of the bypass flow assembly 20a, the total current '.
  • the current sensor 100a in the described embodiment measures the current flowing through the downstream LED array, ie, the LED array LED1.
  • the current sensor 100b measures the summation current, which is composed by the LED arrangement LED3 and the current through the bypass arrangement 20b and which corresponds to the current through the downstream LED arrangement LED2.
  • FIG. 2 again shows the LED operating arrangement shown in FIG. 1, wherein both the bypass arrangements 20a
  • bypass arrangements 20a to 20 ⁇ nl) in the illustrated embodiment comprise aslei ⁇ Tenden field effect transistor 21a bis.21 (nl) in which (between the gate of the respective transistor and the control input S in each case, a series resistor 22 to 22 nl) is arranged.
  • the current sensors 100a to 100 (n-1) are formed in the embodiment of Figure 2 as resistors, wherein at the control input S of the respective bypass arrangement, the voltage applied to the associated current sensor, i. the resistance drops.
  • bypass arrangements 20a to. 20 (n-1). are generally controlled as a controllable resistor and / or controllable current source for setting intermediate values, so that realizes a parallel connection to the respective associated LED array is with adjustable resistance or adjustable current source.
  • FIGS. 1 and 2 The mode of operation of the LED operating arrangements according to the invention shown in FIGS. 1 and 2 will be explained below with further reference to FIGS. 3a, b, 4a to f and 5a, b. It is assumed below that the series circuit has a total of six LED assemblies and accordingly five bypass arrangements, each with associated current sensor.
  • FIGS. 3 a, b show the time profile of various current and voltage variables within the LED arrangement according to FIG. 2.
  • FIG. 3 a shows the rising of the pulsating current for a short time interval
  • the rectified supply voltage reaches the forward voltage of the LED arrangement LED1 of about 50 volts, .LED1 conducts and a current I (LED1) flows through the bypass arrangements 20 (n1) to 20a, which acts as a resistance formed current sensor 100a, the diode array LEDl and the total current limiting device to ground, said total current limiting device is in turn formed by a normally-on FET 111 and designed as a resistor current sensor 112.
  • the voltage drop at the current sensor 100a generates a negative control voltage VS (21a) at the control input S, ie a negative gate-source voltage at the transistor 21a.
  • this voltage reaches the gate threshold voltage of the transistor 21a, the current flowing through the bypass arrangement 20a is reduced to the ratio of the gate threshold voltage to the resistance value of the current sensor 100a.
  • the LED arrays LEDn to LED1 are constructed substantially identically, inasmuch as the upstream LED array LED 2 becomes conductive when the instantaneous value of the pulsating DC voltage VGL reaches about 100 volts. Then, the LED array LED 2 also becomes conductive and a current flows through, the current sensor 100b also designed as a resistor. The voltage drop generated thereby at this leads to a negative control voltage at the bypass arrangement 20b, so that also in this the conducted or bridged current is limited. In the example given, the resistance of the current sensor 100b is significantly lower than the resistance of the current sensor 100a, so that the described connection of the transistor 21b and the current sensor 100b is now limited to a higher current.
  • the resistance value of the current sensor 100b is set in the given example so that when the third forward voltage is reached, the current I (21b) provided via the bypass arrangement 21b again drops sharply, but not to about zero as in the present step but to a comparatively low one Value. Only after reaching the forward voltage of the further LED arrangement is the bypass device 21b then transferred into the blocking state on account of the further increased current flow through the current sensor 100b.
  • the LED operating arrangement according to the invention has a multiplicity of series-connected LED arrangements. each of which is assigned a bypass arrangement, with which the associated LED arrangement can be bridged in an operating state.
  • these bypass arrangements of the LED operating arrangement according to the invention are also set up and connected in order to act as a controllable resistor or as a controllable current source, wherein the control is realized by means of an output signal of a current sensor.
  • this current sensor detects both the current conducted by the bypass arrangement and the current flowing through the LED arrangement, which is assigned to the respective bypass arrangement, it is achieved that, independently of any reference voltages, reaching or Exceeding the forward voltage of this LED array can be detected, so that automatically adapts the control of the bypass arrangement to the electronic properties of the associated LED array.
  • FIGS. 4a-f show, over a network period, the time profiles of the individual currents through the respective LED arrangements in the case of an LED operating arrangement designed according to the invention, which comprises a series connection of six such LED arrangements.
  • Figure 4a shows the timing of the downstream first LED array ly
  • the current jumps can be adapted to the course of the applied pulsating direct voltage VGL when the respective flux sensor or resistance value of this current sensor 100a to 100f is reached when the respective flux sensor is reached. to optimize the efficiency of the operating arrangement.
  • the current jumps shown in their entirety in FIG. 4 a are not equidistant, but are adapted to the slope of the supply voltage or, in the present case, the pulsating DC voltage VGL.
  • Figure 5a shows the applied DC voltage VGL and Figure 5b the total current, i. the current I (LED1) through the first LED array LED 1.
  • the LED arrangement LED1 can also be arranged between the high output of the rectifier 10 and the LED arrangement LEDn.
  • the LED array LED1 adjacent to the LED array LED2 is to be regarded as between the two alone the voltage source with the supply voltage VGL is.
  • the term "adjacent" in relation to two LED arrangements designates two successive LED arrangements in the series connection, regardless of whether other elements, such as for example a current sensor or a sensor, exist between these two LED arrangements Current or voltage source are arranged in series.
  • FIG. 6 shows a further embodiment of an LED operating arrangement designed according to the invention, which differs only slightly from that shown in FIG.
  • bypass arrangements 30a to 30 (nl) connected, which are each controlled by a signal of a stand-alone current sensor 100a to 100 (n-1).
  • the same components are with respect to the embodiment of FIG. 2 with. provide the same reference numerals.
  • the self-conducting field-effect transistors 31a to 31 (n-1) are indicated differently since they are included in the newly designed bypass arrangement 30a to 30 (n-1).
  • the bypass arrangements 30a to 30 (n-1) again comprise one.
  • Signal terminal S which as in the embodiment shown in Figure 2 receives its control signal from a provided in the series circuit of LED arrays current sensor 100a to 100 (n-1), which are also formed here as resistors with well-defined resistance.
  • the bypass arrangements according to FIG. 6 have a second control connection S2 which scans the cathode voltage of the LED arrangement, which is arranged downstream of the associated LED arrangement of the bypass arrangement. Both control signals are conducted via respective series resistors in parallel to the gate of the respective transistor 31a to 31 (n-1).
  • the LED operating arrangement shown in FIG. 6 does not differ from that shown in FIG.
  • the temporal behavior described in FIGS. 3 to 5 is very similar, but the current jumps when the respective threshold voltage of an LED arrangement is reached are in the embodiment shown in FIG. 6 also linked to the real threshold voltage of the LED.
  • Arrangement adapted, which is connected downstream of the bypass arrangement. The described parallel connection of the two control signals to the gate of the respective transistor has the consequence that at increased forward voltage in the downstream adjacent LED arrangement a reduced constant current is set in the bypass arrangement or an increased constant current at a lower forward voltage to set a constant electric power for the downstream adjacent LED array.
  • FIG. 7 shows a further embodiment of an LED operating arrangement designed according to the invention, which, with respect to the embodiment illustrated in FIG. 2, solely by the design of the bypass arrangement, the design of the total current limiter 120 and the placement of the LED arrangement LED1 in the series connection of the LED arrangements differs.
  • the same components are again provided with the same reference numerals.
  • the LED arrangement LED1 is arranged between the high output of the rectifier 10 and the LED arrangement LEDn.
  • the LED arrangement LED1 is arranged adjacent to the LED arrangement LED2, since between them both the current limiter 120 and the voltage source with the supply voltage VGL are located.
  • the current flowing through LEDl I LED1 is detected and the output signal of the current sensor is applied to the control input S of the bypass device 40a, which is associated with the LED array LED2.
  • bypass arrangements 40a. to 40 (nl) are in turn constructed identically. They each include a self-locking field-effect transistor whose drain or source is connected to the terminal AI or A2. is.
  • the pulsating DC voltage VGL is connected to the gate of the transistor 41a and thus serves to charge it, so that the transistor already in the presence of a very low voltage VGL in the conductive state.
  • all the bypass arrangements 40a to 40 (nl) are conductive, so that the associated LED arrangements LED2 to LEDn are bridged.
  • the resistor 45a is provided.
  • FIGS. 8a, b show time profiles of different current and voltage variables within the LED arrangement according to FIG. 7, similar to that shown in FIGS. 3a, b with respect to the embodiment according to FIG.
  • FIGS. 8a, b again show a short section over a period interval starting from the zero crossing of the pulsating DC voltage VGL.
  • the threshold voltage of the LED array LEDl is reached, after reaching the current flowing through the LEDl until a current threshold determined by the controllable diode 44a and the output of the current sensor 100a is reached, which over the interval between 0.5 ms and about 1.03 ms is kept approximately constant.
  • the bypass arrangement operates essentially as a con- Constant current source, ie as a controlled resistor, such that the current flowing through the bypass arrangement remains constant. In this time interval again falls across the drain-source of the transistor 41 a, the difference between the
  • Threshold voltage of the LED array LED1 and the further increasing voltage VGL Threshold voltage of the LED array LED1 and the further increasing voltage VGL. If VGL reaches the sum of the forward voltages of the two LED arrays LED1 and LED2 conducts LED2, so that the additional current also leads to a further voltage drop at the current sensor 100a, and the transistor 41a goes into the blocking state, I (41a) drops to approximately Zero, see Figure 8a.
  • the circuit is designed so that after about 1.6 ms when reaching the next forward voltage by VGL, more precisely the sum of the forward voltages of the LED arrays LED1, LED2 and LED3, the bypass device 40b also blocks the current I (41b) through transistor 41b drops to about zero, see. FIG. 8a.
  • FIG. 8a FIG.
  • FIG. 8b shows the gate-source voltage VGS (41a) of the bypass device 40a.
  • the jump of this gate-source voltage upon reaching the threshold voltage for the LED array LED 2 leads to a jump to such values that this bypass arrangement 40a blocks.
  • the further sinking of the gate-source voltage connected with the connection of the further LED arrangements can be seen from FIG. 8b, but has no longer any effect, since the bypass arrangement 40a already completely blocks.

Abstract

L'invention concerne un système de commande de DEL (1, 2, 3) servant à améliorer le rendement en fonctionnement d'ensembles de DEL branchés en série, dans lequel les ensembles de DEL (LEDi, i=1… n) comportent chacun une première et une seconde connexion, et le circuit en série des ensembles de DEL est connecté à une tension d'alimentation (VN), une pluralité d'ensembles de DEL (LEDi, i=2… n) étant associés respectivement à un système de dérivation (20i, i=a… n-1) de telle sorte qu'une connexion de dérivation du système de dérivation est respectivement relié à une connexion de l'ensemble de DEL et que le système de dérivation respectif comporte en outre au moins une connexion de commande (S, S2) et court-circuite l'ensemble de DEL (LEDi, i=2… n) associé dans un état de fonctionnement. Le système de commande de DEL selon l'invention se caractérise en ce qu'une connexion de commande (S) d'un système de dérivation respectif (20i, i=a… n-1) est connecté à un capteur de courant correspondant (100a… n-1) qui sert à la détection d'un flux de courant à travers un ensemble de DEL (LEDi, i=1… n-1) qui est voisin de l'ensemble de DEL (LEDi, i=2 …n) qui est associé au système de dérivation respectif (20i, i=a… n-1), le système de dérivation respectif servant en outre de résistance pouvant être commandée. L'invention concerne en outre un procédé servant à faire fonctionner une pluralité d'ensembles de DEL agencés en série.
EP11802418.1A 2010-12-22 2011-12-21 Appareil de commande de del Active EP2656687B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010063985A DE102010063985A1 (de) 2010-12-22 2010-12-22 LED-Betriebsgerät
PCT/EP2011/073640 WO2012085118A1 (fr) 2010-12-22 2011-12-21 Appareil de commande de del

Publications (2)

Publication Number Publication Date
EP2656687A1 true EP2656687A1 (fr) 2013-10-30
EP2656687B1 EP2656687B1 (fr) 2016-07-13

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DE (1) DE102010063985A1 (fr)
WO (1) WO2012085118A1 (fr)

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DE102010063985A1 (de) 2012-06-28
EP2656687B1 (fr) 2016-07-13
WO2012085118A1 (fr) 2012-06-28

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