• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An arrangement (100) for operating LEDs has at least two groups (LED A, LED B, LED C) of LEDs, a controllable switch arrangement (20) for variable interconnection of the LED groups (LED A, LED B, LED C) with one another , in order to form an LED arrangement, as well as a control circuit (15) which is designed to control the switch arrangement (20) depending on an input voltage (Vline) of the arrangement (100) in order to connect the LED groups (LED A , LED B, LED C) to dynamically change one another, the control circuit (15) being designed to control the switch arrangement (20) in such a way that all LED groups (LED A, LED B, LED C) are part of the resulting LED Arrangement are.
    公开号:AT17198U1
    申请号:TGM207/2016U
    申请日:2016-08-25
    公开日:2021-09-15
    发明作者:Gajdos David；Steffens Thomas
    申请人:Zumtobel Lighting Gmbh；
    IPC主号:
    专利说明:

    description
    ARRANGEMENT AND METHOD OF OPERATING LEDS
    The present invention relates to an arrangement for operating a plurality of light-emitting diodes or LEDs and a corresponding method for this. In particular, the invention relates to an arrangement which makes it possible to drive LEDs directly with a rectified alternating voltage. In this context, “direct control” is understood to mean that, for example, no upstream converter is used to convert an AC voltage on the input side into a DC voltage to operate the LEDs. Instead, for example, the centrally available AC supply voltage can be used directly to operate the LEDs.
    In order to be able to ensure optimal operation of light-emitting diodes or LEDs, they should be supplied with current in a suitable manner, that is to say operated at a voltage and with a current that is appropriately adapted to the needs of the LED arrangement. This means that the voltage ultimately dropping across each individual LED should ideally essentially correspond to the voltage at which optimal LED operation is guaranteed. At the same time, the current should be set to a certain predetermined value, which ultimately leads to LED operation with high efficiency.
    In order to enable LED operation in accordance with the above conditions, operating devices in the form of so-called converters are usually used, which convert the alternating voltage applied to the input side into a corresponding direct current with a suitable voltage. These converters contain corresponding AC-DC converters, which usually contain a switching regulator, with the help of which this output voltage can be set to a desired value. Such operating devices are available in a wide variety of variants and also allow - if desired - a dimming of the LEDs in order to flexibly adapt the brightness of the light output and, if necessary, also to change the spectral composition and thus the color or the color temperature of the overall light output.
    On the other hand, the use of appropriate converters is associated with increased effort (both in terms of costs and space requirements), which is why it would be desirable to use LED assemblies that directly to the general without the use of a corresponding converter Supply voltage can be connected. Such arrangements are referred to as AC LED modules and, in particular, also allow the end user to use LEDs in a more versatile manner.
    Known AC-LED modules are sold, for example, by the companies Seoul Semiconductor and Altoran. In both cases, the concept for operating the LEDs is based on the idea of dividing the LEDs into several groups, which are connected in series with one another depending on the current level of the AC voltage applied to the input side. Depending on the level of the AC voltage rectified by an input-side rectifier, a different number of LED groups are connected to one another in series, the number increasing with increasing voltage. While only a small number of LEDs are connected in series at low voltage, this number increases significantly at higher voltage, so that at least approximately the LEDs connected to the supply voltage are operated at a suitable voltage. As a result, the LEDs of a first group are in principle permanently activated, whereas other groups are activated less often or only very briefly in those time ranges in which the voltage is in the range of the maximum value of the alternating voltage. A corresponding arrangement for operating LEDs is also described, for example, in DE 10 2015 202 814 A1.
    The procedure described above thus makes it possible to dispense with a converter, but the LEDs are loaded to different degrees in this case. As already mentioned, the LEDs in one group are operated almost continuously, whereas LEDs in other groups are only activated temporarily or only extremely briefly and immediately
    then be deactivated again.
    This unequal load is viewed as disadvantageous because on the one hand it leads to stronger and possibly perceptible to an observer fluctuations in brightness with respect to the total emitted light and on the other hand there is the risk that individual LED groups fail prematurely.
    The present invention is therefore based on the object of providing an improved concept for operating LEDs which, in particular, enables LEDs to be operated while avoiding a converter. The disadvantages outlined in connection with the prior art should, however, be avoided as far as possible.
    The object is achieved by an arrangement for operating LEDs having the features of claim 1 and by a method according to claim 10.
    Advantageous developments of the invention are the subject of the dependent claims.
    The solution according to the invention is based on the idea of dividing the LEDs to be operated in turn into LED groups, but changing their interconnection dynamically with one another during operation. Within a half-sine wave of the supply voltage, for example, the topology of the interconnection of the groups with one another changes from a parallel circuit via several parallel-serial circuits to a pure serial circuit and back again, but in contrast to the solution known from the prior art, always all LED groups are part of the resulting LED arrangement that is supplied with voltage. While individual LED groups were added in the prior art depending on the level of the supply voltage, according to the present invention only the type of interconnection of the LED groups with one another is adapted in such a way that permanent operation of all LEDs is made possible as long as the supply voltage is higher is the forward voltage of the largest individually switchable LED group. In this case, all LEDs are ideally loaded essentially equally over a half sine wave of the supply voltage, even if different loads may be present at individual points in time. The essentially even load on the LEDs ensures, on the one hand, a better appearance with regard to the light output and, on the other hand, that the risk of an individual LED group failing prematurely due to damage is reduced.
    According to the present invention, an arrangement for operating LEDs is proposed which comprises at least two groups of LEDs, a controllable switch arrangement for the changeable interconnection of the LED groups with one another and a control circuit which is designed to switch the switch arrangement depending on the To control the input voltage of the arrangement in order to dynamically change the interconnection of the LED groups with one another, whereby, as already mentioned, basically all LED groups are connected to an LED arrangement operated with the possibly rectified input voltage.
    The present inventive solution also allows the LEDs to be operated in such a way that the voltage dropping individually across an LED essentially corresponds to the forward voltage of the LED, that is, enables an essentially optimal LED operation. The disadvantages known from the prior art and described above can, however, be avoided in an advantageous manner.
    The LED groups, the interconnection of which is dynamically modified according to the invention, can be designed identically in a simple manner, each LED group being formed by a serial LED string, for example. However, such a configuration is not absolutely necessary and it would also be conceivable to design the various LED groups differently and / or to implement individual LED groups by connecting LEDs in parallel.
    The controllable switch arrangement, with the help of which the dynamic changing of the interconnection of the LED groups with one another is realized, can, for example, in the form of a matrix switch
    device, which contains several corresponding optocouplers or comparable switching elements. These are connected to the inputs and outputs of the various LED groups in a suitable manner and then enable the LED groups to be connected in parallel and / or in series, depending on the control. As already mentioned, the circuit arrangement is controlled by a corresponding control circuit which, depending on the level of the input voltage, defines a suitable configuration for the LED groups and then carries out a corresponding control. Instead of the optocouplers mentioned, other switching elements such as MOSFET or bipolar transistors could also be used. These are then preferably controlled via a corresponding driver stage, since some of the switching elements are at high potential. In one embodiment, optocouplers are used in which the electrically isolated driver stage is also integrated, in addition to the bipolar transistor, which forms the actual switching element. Alternatively, however, level offset stages or driver stages with transformers can also be used, for example.
    As is known, for ideal LED operation, not only should a suitable voltage drop across the LEDs, but the current should also assume a desired value. For this purpose, it is known from the prior art, for example, to arrange a current regulator or a corresponding so-called current sink at the output of the LED group to be operated, which adjusts or limits the current to a specific value. Corresponding current sinks can also be provided in the arrangement according to the invention, which are also controlled by the control circuit and are operated as a function of the way in which the LED groups are interconnected. There is the possibility of providing an individual current regulator or a group of current regulators connected in parallel on the output side of the LED arrangement formed overall by the interconnected LED groups. As an alternative to this, however, provision can also be made for a current regulator to be assigned directly to each LED group, which then regulates the current flow directly through this group accordingly. As will be explained in more detail below, the current regulators can also be controlled in a certain way in order to briefly suppress a current flow while changing the connection configuration of the LED groups and thereby prevent the LEDs from briefly lighting up strongly.
    According to the invention a method for operating LEDs is also proposed, wherein the LEDs are divided into at least two groups, the interconnection of the LED groups is dynamically changed depending on an input voltage to form an LED arrangement, and all LEDs -Groups are part of the resulting LED array.
    The concept according to the invention thus in particular allows the LEDs to be operated by a rectified alternating voltage. However, the LEDs can also be operated in the same way when there is a DC voltage on the input side, which is often the case with larger lighting systems, for example, when there is an emergency operating state and the general power supply is replaced by a central or local emergency power supply. In this case, LED operation can also be enabled, in which case it can then be provided that the control unit carries out a special operation of the LEDs that is coordinated with this.
    The invention will be explained in more detail below with reference to the accompanying drawing. Show it:
    FIG. 1 shows a first exemplary embodiment of an arrangement according to the invention for operating LEDs, the LEDs being divided into three LED groups;
    FIG. 2 shows different interconnection states of the LED groups with one another depending on the level of the rectified input voltage;
    FIG. 3 shows, schematically, the adaptation of the voltage requirement of the LED arrangement formed by the LED groups that are variably connected to one another;
    FIG. 4 shows an alternative embodiment of an arrangement for operating LEDs;
    FIG. 5 shows a third variant of an arrangement according to the invention for operating LEDs;
    Figure 6 possibilities for dynamic interconnection of four LED groups
    depending on the level of the input voltage;
    FIGS. 7a to 7e are schematic representations of the activation of the switch arrangement in order to achieve the configurations shown in FIG. 6; and
    Figures 8a and 8b show the flow chart of a method for controlling and dynamically interconnecting the LED groups.
    FIG. 1 shows a first exemplary embodiment of an arrangement according to the invention, generally provided with reference 100, for operating LEDs. In the illustrated embodiment, a configuration of three LED groups LED A, LED B and LED C is shown, wherein - as explained in more detail below - the concept can of course be expanded to a larger number of LED groups. Furthermore, for the sake of simplicity, it is assumed in the following that all three LED groups are designed identically and are each formed by a serial LED cluster with an identical number of identical LEDs. However, this is also not absolutely necessary, but the LED groups could also be designed differently in terms of the number and arrangement of the LEDs. It would also be possible, for example, for each individual LED group to be formed by a parallel connection of two serial LED strings.
    As already mentioned, the arrangement 100 according to the invention serves to be able to operate the LEDs without the use of an AC / DC converter. This means that the supply voltage Vine applied on the input side is fed essentially unchanged to the LEDs. The only restriction is that the arrangement 100 has a rectifier 10 on the input side, with the aid of which the input voltage Vine is basically rectified into a voltage of constant polarity. However, the resulting voltage Voc still has the ripple typical of an AC supply voltage and fluctuates between the value 0 and the maximum value of the input voltage Viine-
    According to the invention, as already described, the three LED groups LED A, LED B and LED C to be dynamically interconnected or coupled with one another in such a way that the resulting LED arrangement for operation according to the current value of the rectified input voltage Voc suitable is. This is achieved with the aid of a schematically illustrated switch arrangement 20 which forms a switch matrix which enables the inputs and outputs of the three LED groups LED A, LED B and LED C to be optionally and dynamically connected to one another. The switch matrix 20 accordingly has a plurality of controllable switching elements which are controlled in a suitable manner by a control circuit 15. Since the control of the switches must be dependent on the rectified supply voltage Voc, a voltage divider 11 is provided which taps an input value for the control circuit 15 required to control the switch arrangement 20, which in turn allows conclusions to be drawn about the level of the rectified supply voltage Voc. A power supply unit 12 is located parallel to the voltage divider 11 and generates a DC supply voltage for a microprocessor forming the control unit 15 from the rectified supply voltage Voc. This can be used at the same time by the control circuit 15 as a reference voltage for evaluating the output voltage of the voltage divider 11.
    The dynamic connection of the three LED groups LED A, LED B and LED C with one another
    this now takes place in such a way that an interconnection is achieved which is suitable for the current value of the rectified input voltage Voc. This principle is shown in FIG. 2, three different interconnection configurations being shown which are set as a function of the value of the voltage.
    On the left-hand side, it is assumed that there is initially a low voltage value, as is the case, for example, in the vicinity of the zero crossing of the external supply voltage Vine. Since, in this case, not too many LEDs should be connected in series in order to enable a voltage suitable for operation to be dropped across each individual LED, which essentially corresponds to the forward voltage of the LED, the switches of the switch arrangement 20 are switched by the Control circuit 15 controlled in such a way that the three groups LED A, LED B and LED C are connected to one another to form a parallel circuit. This is where the voltage requirement of the overall resulting arrangement of LEDs is lowest and, despite everything, each LED can be operated with a voltage suitable for operation.
    If, on the other hand, the voltage rises in the course of a half-wave of the supply voltage Vine, there is a change to the configuration shown in the middle of FIG. 2, in which two LED groups (here: LED B and LED C) are connected in parallel and the third LED Group (LED A) is positioned in series with this parallel connection. The total number of LEDs connected in series is increased as a result, which takes into account the fact that an increased input voltage is now available for the LED arrangement. Again it is thus ensured that the voltage drop across each individual LED corresponds to a suitable value.
    If the supply voltage finally rises to a value in the range of the maximum value, a switch is made to the interconnection configuration shown on the right-hand side of FIG. 2, in which the three LED groups LED A, LED B and LED C are connected in series with one another are. This is where the voltage requirement of the resulting LED arrangement is highest.
    It can thus be seen that the switches of the switch arrangement 20 must be controlled by the control circuit 15 depending on the current value of the rectified supply voltage Vpoc in such a way that an interconnection of the LED groups suitable for the current voltage value is implemented to one another enables a suitable voltage drop to be achieved across the individual LEDs. In principle, however, all LED groups are always part of the resulting LED arrangement and, accordingly, all LEDs are activated at the same time when an input voltage is present. In this way, not only is the lighting achieved more uniformly in terms of time, but also the load on the various LED groups is more uniform, which has an extremely positive effect on long-term operation of the arrangement.
    As is known, the current that flows through the LEDs should also assume a suitable value for optimized LED operation. For this purpose, it is provided that current setting means 30 are arranged at the output of the LED arrangement formed by the three LED groups LED A, LED B and LED C. In the exemplary embodiment shown, there are three constant current regulators 3141, 312 and 313 connected in parallel, each of which is followed by a controllable switching element SW1, SW2 or SW3, e.g. in the form of a transistor. In the exemplary embodiment shown, the constant current regulators 31+;, 312 and 313 are not designed to be controllable, but are designed in such a way that they can either be activated or deactivated by the assigned transistor SW1, SW2 or SW3 If no current flows through the relevant branch. In the event that the three constant current regulators 314, 312 and 313 are identical, the current flowing through the LED arrangement can then be changed in three equal steps according to the number of activated constant current regulators 31:, 312 and 313.
    The control of the transistors SW1, SW2 and SW3 is also carried out by the control circuit 15 and specifically matched to the interconnection of the LED groups with each other LED A, LED B and LED C, depending on how many LED groups are connected in parallel , a corresponding number of constant current regulators is activated. This ensures that
    Not only the resulting voltage drop across each individual LED but also the corresponding current flow through the LED assumes a value suitable for LED operation 3 is shown.
    In the example described above, the transistors SW1 to SW3 shown in FIG. 1 serve as pure switching elements with the aid of which the constant current regulators 31: 4, 312 and 313 can be optionally activated or deactivated. Of course, as an alternative to this, it would also be possible to use switchable, that is to say controllable, current regulators which, as indicated by the dashed lines, can then be controlled directly by the control circuit 15. In this case, the additional transistors SW1 to SW3 as switches can then be dispensed with. Furthermore, in this case, the arrangement of three current regulators connected in parallel could also be replaced by a single controllable current regulator, which, however, then has to be designed in such a way that it is able to use LED A, LED B and LED groups for each corresponding circuit configuration LED C to be able to set a correspondingly suitable constant current among each other.
    FIG. 4 shows a slightly modified embodiment of the arrangement 100 according to the invention from FIG. 1. This differs in that now the means for current setting 30 are not arranged as a unit at the output of the LED arrangement, but instead each LED strand or Each group LED A, LED B and LED C is individually assigned a constant current regulator 314, 312 or 313 with a downstream switching element SW1, SW2 or SW3. However, the same applies as mentioned above, namely that the series connection of the non-controllable constant current regulator and switching element could also be replaced by a controllable current regulator.
    One advantage of the variant shown in Figure 4 is that the controllable switching elements SW1 to SW3 could possibly also be dispensed with, since the constant current regulator 311, 312 or 313 directly associated with the LED string is active for setting the corresponding current anyway have to be. The number of control outputs of the control circuit 15 could therefore be reduced in this way. On the other hand, in this case there is then the risk that the LED groups LED A, LED B and LED C emit light with different levels of brightness if there are tolerances between the current regulators. There is also less flexibility with regard to the activation of the LED groups LED A, LED bundle LED C.
    Figure 5 shows a development of the embodiment of Figure 4, in which the accuracy in the control of the switch arrangement 20 and the switches of the current setting means 30 is improved by additionally using an input-side unit 13 to detect a zero crossing of the supply voltage Vine will. This unit 13 also supplies an input signal for the control circuit 15, which, coordinated therewith, then carries out a corresponding control.
    FIG. 6 shows an example of operation of four LED groups according to the invention. It is provided that the four LED groups A to D can be interconnected in four different configurations, the four configurations in turn differing in the number of groups connected in series. The configurations or situation 3a and 3b are therefore equivalent in this regard, i.e. three LED groups are connected in series, but in one case the first two groups and in the other the last two groups are coupled in parallel. In the second configuration, on the other hand, two LED groups are connected to one another in parallel and the resulting parallel circuits are coupled in series. With increasing rectified supply voltage Voc, starting from the left-hand configuration (situation 1), there is a change to the configurations further to the right. In order to ensure an even distribution of the load on the LEDs, it is preferable to alternate between configurations 3a and 3b, so that the equalization of the LED load can be further improved. However, the principle is the same as that which has already been explained with reference to the previous figures. The number of groups connected in series will therefore depend on the available
    adapted to the rectified supply voltage in order to be able to achieve a suitable voltage drop across the LEDs, but in principle all LED groups are activated. In addition, FIG. 6 also shows the power requirement resulting from the respective configuration, the information being shown in percent based on the maximum requirement resulting from the right-hand or first configuration.
    The mode of operation of the switch arrangement 20 is to be explained in more detail below with reference to FIGS. 7a to 7e. In this case, each LED group is shown schematically by a single LED, the switch arrangement 20 being implemented by a grid-like arrangement of conductor tracks running vertically and horizontally in the drawing. Two intersecting conductor tracks are initially not electrically connected at the respective intersection points, although an electrical connection can be implemented via controllable switches positioned at the intersection points. FIGS. 7a to e then show, for the various circuit variants shown in FIG. 6, which of the respective switches must be activated by the control unit or at which intersection points an electrical connection must be present in order to achieve the desired circuit configuration. The resulting current flow is only shown explicitly for situation 5 in FIG. 7e by a dashed line; in the other situations it is obtained in an analogous manner.
    It can be seen that switches do not necessarily have to be present at some intersection points, since no corresponding connection of the intersecting conductor tracks is required here. Other crossing points, on the other hand, are basically controlled in the same way, so that in the embodiment shown with four LED groups, the control circuit 15 ultimately requires eight outputs to control the switch arrangement 20 - as well as four others to control the constant current regulator. The variant shown is, however, not the only conceivable solution, but it would also be possible to reduce the number of control outputs required for the switch arrangement 20 to six by skillfully controlling the switches.
    Optocouplers, for example, can be used as controllable switching elements. The control circuit 15, the other units for detecting the rectified supply voltage and possibly also the switches of the switch arrangement 20 can be integrated into what is known as an ASIC, although it is also possible to outsource the switches to a separate module. Depending on the embodiment, either output connections for controlling the switches or output connections for the LED groups to be variably connected to one another are then located on the ASIC with the control circuit.
    The method carried out by the control circuit 15 in relation to the variant shown in Figures 6 and 7 with four LED groups is shown schematically in Figures 8a and 8b, this - as shown in Figure 8a - in a first phase It consists in selecting a desired state (State (1) to State (4)) with regard to the interconnection of the LED groups depending on the measured rectified supply voltage. For this purpose, the measured voltage is compared with threshold values in each case and when it is detected that certain threshold values have been exceeded or fallen below, a change is made to a new state.
    The implementation of the selected state is then shown schematically in Figure 8b, a special feature of the method shown is that when a state of an interconnection changes to a new interconnection state, the switches SW1 to SW4 assigned to the constant current regulators are switched off very briefly, in order to prevent the LEDs from flashing during the change and to enable the switches of the switch arrangement 20 to be activated at the same time. Only after the switch arrangement 20 is controlled accordingly and thus the LED groups are connected to one another in the desired manner, depending on the selected circuit configuration, the switches assigned to the four current regulators are activated again and a current flow corresponding to the selected configuration is set. In this case, it is provided in the present case that the current regulators shown in FIGS. 7a and 7b do not each set the same current, but rather
    - again based on the maximum current flow - set the following proportion: SW1: 25%
    SW2: 8.33%
    SW3: 16.67%
    SW4: 50%
    In this way, by activating the switches SW1 to SW4 in accordance with the diagram in FIG. 8b, the current flow can be set to the respective required value shown in FIG. This example shows that the current regulators do not necessarily have to be identical.
    Furthermore, it can be seen in FIG. 8b that by alternately setting a control bit, alternating between the circuit configurations 3a and 3b (see FIG. 6) takes place in order to further optimize the uniform loading of the various LED groups.
    An advantage of the solution according to the invention is also that LED operation is also possible if a DC voltage is present at the input of the arrangement, which could be the case, for example, in an emergency operating state. It is then only necessary to select an interconnection of the LED groups that corresponds to the applied DC voltage and is then retained permanently. The arrangement is therefore able to ensure operation of the LEDs with a wide variety of input voltages. Since the mode of operation is in particular independent of the frequency of the supply voltage (provided the control circuit and the switches of the switch arrangement work sufficiently quickly), the solution according to the invention can be used with a wide variety of supply voltages and mains frequencies and thus also in different countries.
    Overall, the solution according to the invention thus opens up the possibility of operating LEDs without first converting an alternating supply voltage into a direct voltage. Compared to solutions known for this from the prior art, the LED operation is again optimized, the method according to the invention being easily expandable to a higher number of LED groups.
    权利要求:
    Claims (10)
    [1]
    1. An arrangement (100) for operating LEDs, comprising
    * at least two groups (LED A, LED B, LED C) of LEDs,
    * a controllable switch arrangement (20) for changeable interconnection of the LED groups (LED A, LED B, LED C) with one another in order to form an LED arrangement, as well
    * A control circuit (15) which is designed to control the switch arrangement (20) depending on an input voltage (Vine) of the arrangement (100) in order to dynamically connect the LED groups (LED A, LED B, LED C) to one another change,
    wherein the control circuit (15) is designed to adjust the switch arrangement (20) in such a way
    control that all LED groups (LED A, LED B, LED C) are part of the resulting
    LED arrangement are.
    [2]
    2. Arrangement according to claim 1, characterized in that the LED groups (LED A, LED B, LED C) are identical.
    [3]
    3. Arrangement according to claim 1 or 2, characterized in that the LED groups (LED A, LED B, LED C) are each formed by a serial LED string.
    [4]
    4. Arrangement according to one of the preceding claims, characterized in that the switch arrangement (20) is formed by a matrix circuit of controllable switching elements which are connected to the inputs and outputs of the LED groups (LED A, LED B, LED €) .
    [5]
    5. Arrangement according to claim 4, characterized in that the switching elements are formed by optocouplers.
    [6]
    6. Arrangement according to one of the preceding claims, characterized in that it additionally has flow control means (30).
    [7]
    7. Arrangement according to claim 6, characterized in that the current regulating means (30) comprise means for constant current regulation which are individually assigned to the individual LED groups (LED A, LED B, LED C).
    [8]
    8. Arrangement according to claim 6, characterized in that the current regulating means (30) of the LED arrangement formed by the LED groups (LED A, LED B, LED €) comprise upstream or downstream means for constant current regulation.
    [9]
    9. Arrangement according to claim 7 or 8, characterized in that the means for constant current regulation comprise a controllable constant current regulator or a non-controllable constant current regulator to which a switching element is assigned.
    [10]
    10. Process for operating LEDs, * where the LEDs are divided into at least two groups (LED A, LED B, LED C), * where, depending on an input voltage (Vine), the interconnection of the LED groups (LED A, LED B , LED C) are dynamically changed with one another in order to form an LED arrangement, and
    * whereby all LED groups (LED A, LED B, LED C) are part of the resulting LED arrangement.
    In addition 8 sheets of drawings
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    申请号 | 申请日 | 专利标题
    DE102016210736.4A|DE102016210736A1|2016-06-16|2016-06-16|Arrangement and method for operating LEDs|
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