WO2017153151A1

WO2017153151A1 - Controlling an led arrangement and led illumination system

Info

Publication number: WO2017153151A1
Application number: PCT/EP2017/053632
Authority: WO
Inventors: Horst-Werner Maier-Hunke
Original assignee: "Durable" Hunke & Jochheim Gmbh & Co. Kommanditgesellschaft
Priority date: 2016-03-11
Filing date: 2017-02-17
Publication date: 2017-09-14
Also published as: DE102016104452A1; EP3427542A1

Abstract

The invention relates to a control device (1) for controlling an LED arrangement (Lw, Lk, Lw2, Lk2, Lb, La). The control device comprises a current sensor device (3) which is coupled with the LED arrangement (Lw, Lk, Lw2, Lk2, Lb, La) and designed in such a way that it measures a current (lw, lk, lw2, lk2, lb, la) flowing through the LED arrangement (Lw, Lk, Lw2, Lk2, Lb, La) and generates an actual current signal (Uw, Uk, UW2, Uk2, Ub, Ua) representing said current (lw, lk, lw2, lk2, lb, la). The control device also comprises a preferably programmable amplifier (4) which is designed in such a way that it modifies the actual current signal (Uw, Uk, UW2, Uk2, Ub, Ua) coming from the current sensor device (3) with an amplifying factor selected in accordance with an intensity control signal (ISW, ISk, ISW2, ISk2, ISb, ISa). The control device (1) further comprises a constant current source (5) which is designed in such a way that it supplies the LED arrangement (Lw, Lk, Lw2, Lk2, Lb, La) with a defined current (L, lk, Iw2, Ik2, lb, U) using the modified actual current signal (UMW, U Mk, U Mw2, UMk2, U Mb, UMa). The invention also relates to a corresponding method for controlling an LED arrangement (Lw, Lk, Lw2, Lk2, Lb, La) and an LED illumination system (100), in particular an LED lamp (100) with an LED arrangement (Lw, Lk, Lw2, Lk2, Lb, La) and a control device (1) of this type.

Description

Control of an LED arrangement and LED lighting system

The invention relates to a control device for controlling an LED arrangement and an LED lighting system with such a control device. Furthermore, the invention relates to a method for controlling an LED array and the use of such a control device for controlling the overall intensity and the mixed color temperature of the light of an LED lighting system with at least two LED arrays that emit light with different color temperatures.

In recent years, there are more and more LED lighting systems, especially LED lights, which have multiple LED arrays, the light with different light spectra, d. H. with different color temperatures or light temperatures, send out. These different light spectra then mix to form a total light spectrum of the LED lighting system. An LED arrangement according to the present invention may consist of a single LED or of several LEDs, for. As an LED group with several LEDs to be controlled together. The proportions of the light emitted by the LED arrays within the total light spectrum are usually controlled using a given spectrum control function, d. H. For example, the user may specify a desired brightness of the overall light (total brightness) or a particular blending color temperature (total color temperature) which determines which LED array will emit how much light. This allows the user to adjust the light output to his current needs and / or mood.

Recent research has shown that the color composition of light has not negligible effects on the well-being and performance of persons irradiated with the light. This is especially true for the proportion of blue light (which is sometimes referred to as cold light). Blue light is registered by the retinal ganglion cells of the eyes and can actively influence the biorhythm. The biorhythm or sleep / wake rhythm is also controlled in nature by the color of daylight. Blue light is radiated in nature mainly from the daytime sky, which sets the biological rhythm to "day" and ensures that the body is awake.The new findings indicate that blue light in particular actively affects the production and effect of " Sleep- Hormons "melatonin inhibits and thus the happiness hormone serotonin can dominate more strongly, especially in people who work predominantly indoors, this can lead to the fact that they receive too little blue light during the day and thus this rhythm can get out of balance be desirable for the user to increase his well-being and his ability, if he has the opportunity to adjust adjusted to his daily routine always an optimal color temperature of the light to which he is exposed.

This is possible if, for example, the proportions of the light emitted by the LED arrays are controlled within the common overall light spectrum of the LED arrays in accordance with a predetermined, in particular time of day, circadian spectrum control curve. In this way, the user can ensure that the total light spectrum or the color temperature value of the total light emitted by the LED light at any time is well adapted to its daily rhythm and its current situation. For example, a spectrum control curve could be such that in the morning at the start of work, the blue light component or cold light component is slowly increased in order to further assist the user in his performance during a particularly active phase in the morning, whereas at midday the blue light component is shut down again. to prepare the user for the midday rest by the biological effect of light. After the lunch break, a renewed increase in the proportion of blue light could then be provided, and at the end of the working time, the proportion of blue light in the evening is reduced again slowly, as is also the case in nature.

Particularly in such LED lighting systems with multiple LED arrays, it is important that the intensity of the light emitted by the LED arrays can be controlled as accurately as possible in order to avoid unwanted fluctuations in the color temperature and / or overall brightness. In principle, it is advantageous for any regulation of an LED arrangement if the current through the LED arrangement can be regulated as accurately as possible over a wide range, ie. H. The LED arrangement should be able to be dimmed to a constant set value in the largest possible range. There are various possibilities.

In order to keep the current constant, for example with conventional current sensors, for example with a measuring resistor (shunt) in the current circuit of the LEDs, the current measured by the LEDs and this measured value as the feedback value Constant current regulator are supplied, which then ensures that the LED array is supplied with a certain, given by the current regulator current. To simply provide a constant current, there are a variety of simple and inexpensive current regulators that can be implemented as a series regulator or switching regulator, for example. Likewise, there are a variety of conventional low-cost current sense resistors that can be used in such a circuit.

A commonly used method of dimming the LED array with such constant current regulators. D. H. Adjusting the brightness is the so-called pulse width modulation, in which the LEDs are operated with very short pulses (with the respective constant current), wherein the pulse length and the time between the pulses affect the brightness of the LED. In such circuits, a typical problem is that (especially with a strong reduction of the light intensity), the user may unconsciously or even consciously recognize flicker of the light sources and stroboscopic effects.

Alternatively, special current regulators can be constructed with adjustable current, which is associated with considerable effort, especially if a digital control of the value to be set is desired, for example because the signals are supplied by a digitally operating computer unit such as a microcontroller, the specifications for the Intensity of the light of the LED array, for example due to a given spectrum control curve.

It is an object of the present invention to provide a control device and a method for the most flicker-free control of the current through an LED array and a corresponding LED lighting system, which are as simple and inexpensive to implement.

This object is achieved by a control device according to claim 1, by an LED lighting system according to claim 7 and by a method for controlling an LED array according to claim 12.

A control device according to the invention for controlling an LED arrangement or for controlling the current through an LED arrangement, like the simple control devices described above, first comprises a current sensor device which is coupled to the LED array and designed such that it passes through the LED -Arrangement measures flowing current and an actual current signal representing this current, for example in the form of a voltage value generated. Such a current sensor device can also be constructed in a conventional manner with a measuring resistor (shunt).

In addition, this control device also has a constant current source which is designed such that it supplies the LED arrangement with a defined current, using a feedback value based on the actual current signal measured by the current sensor device. If this feedback value is constant, the current through the LED is accordingly constant. Such a constant current source can also be constructed in a conventional manner, for example as a series regulator or as a step-down regulator, so that ready-made components can be used for this purpose.

According to the invention, however, unlike the conventional control devices, the control device now has an amplifier with adjustable gain, which is designed such that it initially receives the actual current signal coming from the current sensor device as a function of an intensity control signal modified gain factor, d. H. usually reinforced. The constant current source then uses this actual current signal modified by the amplifier as the feedback value. The amplifier is thus connected between the current sensor device and the constant current source and accordingly has an input for the actual current signal from the current sensor device and an output for the modified actual current signal, which is given to the constant current source as a feedback signal. In addition, this amplifier can also - as explained later - have an input for the intensity control signal. This amplifier is preferably a digitally programmable amplifier.

In the control device according to the invention can therefore be used with conventional current sensor devices and conventional low-cost constant current sources, ie conventional linear regulators, switching regulators or the like. By the intermediate amplifier, however, the constant current source is simply another actual current played as a feedback value, which means that when amplifying the actual current signal, ie an increase in the feedback value, automatically the constant current source ensures that the current through the LED arrangement is lowered, so the actual actual current is reduced and thus the intensity of the light emitted by the LED array is reduced. About the, as described below, specifiable intensity control signal can easily by the choice the gain of the intensity of the LED array can be adjusted, it is automatically ensured that at a constant intensity control signal, the current through the LED array and thus the intensity of the emitted light is constant. Therefore, in the invention, the current can be adjusted without access to the internal life of conventional constant-current regulators without having to use pulse-width modulation. By using the conventional, produced in large quantities current sensors and constant current sources, a flicker-free control device can be realized in a particularly cost-effective manner, which - as will be explained later - also costly digitally programmable amplifier are available or can be constructed with little circuit structure ,

An inventive LED lighting system - which is preferably an LED light, very particularly preferably a desk lamp, floor lamp, wall light or ceiling light (also suspended light) - has in addition to at least one LED array such control device according to the invention.

In a method according to the invention for controlling an LED arrangement, a current flowing through the LED arrangement is correspondingly measured and an actual current signal representing this current is generated, which then in an amplifier, preferably digitally programmable, with an intensity control signal selected amplification factor is modified. By means of a constant current source, the LED array is supplied with a defined current using the modified actual current signal. The intensity control signal may for example be based on user input values, e.g. be detected by means of a user interface. Additionally or alternatively, the intensity control signal is preferably formed using a light measurement value or based on this light measurement value or a plurality of light measurement values which are generated by one or more light sensor arrangements, which u. a. detect the light emitted by the LED array, be provided. The control device then preferably has one or more corresponding light sensor arrangements for this purpose.

Such a control device is preferably used for controlling the overall intensity and the total light spectrum of an LED lighting system, in particular an LED lamp with at least two LED arrangements, which emit light with different color temperatures. The overall spectrum of light can be defined by a color temperature value or light temperature value (eg an average value or a maximum of the relevant total light spectrum).

As will be explained later, this is particularly preferably an LED lighting system or an LED luminaire, which has at least one warm white LED arrangement and a cool white LED arrangement and which very particularly preferably has two sensors, with which one is the total light, which is located in an environment around the LED lighting system or the LED light, is measured, and on the other hand, the proportion of blue within the total light can be determined so as to ensure that not only a predetermined Brightness is maintained regardless of the other ambient light, but also a well-defined blue light component, which has the melanopic effect described above. For this purpose, the light controls can advantageously be superimposed on the current controls of the LEDs, the current control is thus a subordinate control loop.

Further particularly advantageous refinements and developments of the invention will become apparent from the dependent claims and the following description, wherein the claims of a particular category can also be developed according to the dependent claims of another category and wherein features of different embodiments can be combined to form new embodiments.

For the realization of the amplifier there are different possibilities:

For example, a voltage-coupled operational amplifier circuit can be constructed with a conventional operational amplifier and a voltage divider with two resistors, wherein at least one of the partial resistors is variable to vary the gain, and the other partial resistor is connected in series to a fixed resistor, which in turn limits the adjustable gain is used. The adjustable part resistance can also be set by an analog value as an intensity control signal, which can be done manually by z. B. is used as an adjustable part resistance an analog adjustable potentiometer.

However, it is particularly preferred, as already explained above, to use a preferably digitally programmable amplifier. Again, the amplifier can again be constructed by a simple operational amplifier circuit, and it is then used as a adjustable resistance a preferably digitally programmable potentiometer (eg the family AD512x or 514s from Analog Devices) used.

However, a programmable amplifier (PGA) is preferably used as the programmable amplifier. This has the advantage that only one integrated component, namely this PGA, is required for this purpose.

In particular when using a programmable amplifier such as a PGA or an operational amplifier circuit with a digitally programmable potentiometer, the intensity control signal can be preset by a digitally operating control unit, preferably a microcontroller. The control device may then in a preferred variant at least in addition to this control unit also have a light sensor arrangement and the control unit is then preferably designed so that it based on at least one of the light sensor array detected light reading and optionally a user input value, such as a key signal on a user interface, an intensity control signal generated, which is then given to the amplifier.

Such a control unit, in particular in the form of a microcontroller, is preferably programmable via an interface (which may preferably be an I2C or an SPI interface, also a wireless interface) in order to be able to arbitrarily change certain control rules, e.g. , B. under which conditions the light intensity of the LED array (s) to increase or decrease, for example, which light readings are required, which time rules are used, etc. In particular, run in such a microcontroller, a program which ensures the entire control takes place in accordance with a predetermined spectrum control curve, in particular a circadian curve, which in turn can preferably be changed via a user interface.

Basically, the light sensor arrangement (s), as well as a user interface or the like, if they produce analog signals, their signals via appropriate analog / digital converter (A D converter) passed to a digitally operating control unit or could the control unit to the Inputs each have integrated A D converter. Particularly preferably, the light sensor arrangement has at least one light sensor element, for example a photodiode or a suitably switched LED, and at least one light sensor electronics which is designed so that the measured light values measured by the light sensor element are forwarded to the control unit in the form of frequency signals. This has the advantage that the control unit, in particular the microcontroller, can easily count the signal for the evaluation. It can then be dispensed with an A / D converter for the signal.

This design of the light sensor arrangement (s) is particularly advantageous together with the invention in order to build a particularly cost-effective, yet reliable control device. In principle, however, such a light sensor arrangement with light sensor electronics which outputs measured light values measured by the light sensor element in the form of frequency signals is also useful in other measuring or control devices, e.g. for controlling LED arrangements which, in addition to the light sensor arrangement, comprise a control unit and a suitable current source in order to supply the LED arrangement with a defined current constant at a constant feedback value, even if the control unit is not provided with an amplifier according to the invention is formed, which amplifies the coming of the current sensor means signal and passes in the modified manner to the constant current source, as described at the beginning in the context of the invention. In this respect, this is an independent advantageous idea.

Such a light sensor electronics may in particular comprise an integrator circuit in order to integrate the measured values respectively measured by the light sensor element in a period of time, ie the photocurrent, before they are then converted into the frequency signal. For example, such a light sensor electronics can be constructed as a relaxation oscillator circuit, consisting of an integrator circuit and a subsequent Schmitt trigger. In this, the photocurrent is first integrated, and then there is a back integration by appropriate feedback of the output signal of the Schmitt trigger to the integrator circuit. An exact embodiment of this will be explained later. Due to the integration in the integrator circuit, possible disturbances are advantageously very well suppressed by the automatic averaging of the current measured by the light sensor element, thus achieving a high reproducible resolution and accuracy. In a particularly preferred variant, the control device has a multiplexer. The latter is designed to multiplex light measurement values coming from a light sensor arrangement in the form of frequency signals and / or user input values and / or sensor values coming from a user interface or from another sensor in the form of frequency signals and to forward them as a combined signal to the control unit. The multiplexing takes place, for example, in the time division multiplex method. The control unit demultiplexes the signals in a simple manner and evaluates them, whereby, as described above, the frequency signals can easily be counted. Overall, such a circuit requires little electronics effort, as can be dispensed with a variety of A / D converters.

The user interface can be z. B. have a number of control button sensors, which output a frequency signal in response to the operation of the respective control buttons in a similar manner as the sensor arrangements. In this case, the user interface can also be part of an overall control device, which is structurally connected to the control device, for example within the LED light. The further sensor or the further sensors may be sensors for measuring environmental properties, in particular a proximity sensor, preferably a radar sensor, which may be, for example, a sensor. B. detects a user presence and ensures that the LED lighting system is issued when no user is in the room and therefore lighting is not required. Alternatively, they can also be sensors for measuring other ambient values, such as barometer values, moisture values, brightness outside of the room, etc.

As already mentioned above, the LED illumination system particularly preferably has at least two LED arrangements which emit light in different color temperatures. The light with the different color temperatures may be differently colored light, for example green light, blue light, red light, yellow light, amber light, etc., but also light with different white light spectra. Most preferably, the LED lighting system has at least one warm white LED array and a cool white LED array (where by the terms "warm white LED array" and "cold white LED array" is meant that the respective LED array Emits light which accordingly emits a warm white or cold white light temperature or a warm white or cold white white light spectrum). The light of these LED arrangements or the mixed light or total light can then be measured, as described above, for example with the aid of the light sensor arrangements. For this purpose, the LED illumination system particularly preferably has at least two light sensor arrangements for this purpose. The control device is then preferably designed such that as a function of first light measurement values which are determined by a first light sensor arrangement of the said light sensor arrangement, an overall intensity of the light emitted by the at least two LED arrangements is regulated. Furthermore, the control device is preferably designed such that the ratio of the intensities of the light emitted by the individual of the at least two LED arrays is regulated as a function of second light measurement values which are determined by a second light sensor arrangement of the light sensor arrangements. In such a variant, the overall brightness of the LED illumination system is thus determined, for example, as a function of the first light measurement values, and depending on the second light measurement values, the overall color temperature or mixed color temperature, since it is ultimately determined by the ratio of the intensities of the LED arrays to each other one or the other color temperature is stronger and thus assumes a greater proportion in the total light.

In this case, the first light sensor arrangement may particularly preferably be designed such that it determines a light measurement value which represents the intensity of the total light in an environment of the LED illumination system. That is, this value is proportional to the current illuminance, and in addition to the light emitted by the LED lighting system itself, u. a. Also, the light from other lighting elements (including daylight, which for example comes through the windows of the room, etc.) is included, depending on the position where the light sensor elements of the light sensor arrays are housed. Particularly preferably, this light measurement value, which represents the intensity of the total light in the surroundings of the LED illumination system, is weighted or measured with the spectral eye sensitivity of the human eye ν (λ). It is preferably possible that this already takes place during the measurement, for example by the first light sensor arrangement being equipped with a corresponding optical filter. An example of this is the silicon photodiode for the visible spectral range with v (A) adaptation BPW21 from Osram. In this component, the optical filter is already integrated.

Furthermore, the second light sensor arrangement is preferably designed such that it determines a light measurement value which is a proportion of the total light in a defined blue Spectral range, ie the blue portion of the light, represents or is proportional to this. In order to achieve this, on the one hand a special light sensor arrangement with a special light sensor element can be used, such as the Hamamatsu S6428 photodiode. In a simple case, however, the second light sensor arrangement for the blue light component can be constructed in a similar manner or even identical to the first light sensor arrangement, only that a weighting then takes place with a desired curve in the blue spectral range, preferably simply by another optical filter which is the light sensor element upstream, so that according to the blue component is measured. The blue spectral range is preferably chosen such that it is at least approximately representative of the melanopic spectral sensitivity s _m ei (A) of the human eye, so that the melanopic efficacy of the light emitted by the LED illumination system can be determined. An alternative to the two light sensor elements is the use of a rgb color sensor such as the S7505 from Hamamatsu. This contains three photodiodes each with a red, green or blue color filter. For accurate measurements, an optical microspectrometer can also be used and the spectral ν (λ) and s _me i (A) weighting can be carried out in the control unit. An example of such a device is the C12666ma Hamamatsu.

Thus, not only the total brightness, measured by the first light sensor arrangement, can be kept at a set constant value with such an LED illumination system, regardless of how the ambient light changes, but it can also be adjusted with the aid of the second light sensor arrangement and a corresponding change Color temperature of the LED lighting system, the melanopically effective blue component in the light are kept constant. In this way it can be ensured that the persons located in a room are exposed to a precisely defined brightness and melanopically effective light component which the persons are currently in need of or which is optimized for the respective persons.

In addition, the LED lighting system can also have other LED arrangements that serve, for example, to achieve further lighting effects. For example, a first group of LED arrays having a warm white and a cold white LED array could form a first light module that is controlled as described above to define a desired fundamental brightness and a desired melanopically effective proportion of light in a room. A further group of LED arrangements can then form another lighting module, for example as a wall lamp. Washers a wall or prefers to illuminate the ceiling of the room in addition to z. B. perform a kind of sky simulation.

At least one further LED arrangement can be selected from the following color temperatures:

- warm white

- cool white

- blue

- amber-colored.

For a sky simulation, preferably at least four further LED arrangements in a group are used, which have the abovementioned light colors or color temperatures. Preferably, the blue color LED assemblies operate together with the cold white and amber together with the warm white LEDs. Of course, it is also possible to incorporate any other LED arrangements in the LED lighting system and to regulate in the manner according to the invention, such as red, yellow, green, etc.

As already mentioned, the color temperature and the brightness of the light emitted by the LED lighting system are preferably controlled according to a spectrum control function. With the help of the control device and the light sensor arrangements can be ensured that the desired color temperature and brightness are respected. As described above, this spectral control function is most preferably a melanopically effective, time-dependent, in particular circadian spectrum control function which can optically influence the user's melatonin budget by the light color or the blue component.

The control unit of the LED lighting system may be provided with a suitable user interface for setting a fixed brightness value or / or a fixed color temperature value or for changing a spectrum control function, in particular a spectrum control curve. This can for example be installed in a housing of the LED light or in a separate control housing, possibly together with the sensors. Preferably, the control unit can also be controlled via a remote control, particularly preferably via an app of a mobile device, in particular smartphones, or the like. Alternatively, the control unit include a web server that provides web pages on which the control unit is operated.

With regard to the features of the possible functions of the luminaire control, the illuminant arrangements, in particular with the cold light and the warm light, the user interface, the app functions or remote control options of the floor lamp, the various time-dependent control functions is to DE 10 2014 1 15 076, DE 10 DE 10 2014 1 15 082, DE 10 2014 1 15 085 and DE 10 2014 1 15 226, in which these various features are explained in detail. The said functions of the luminaires described in these documents can in each case preferably also be realized in the context of the LED illumination system present here, apart from the fact that pulse width modulation for regulating the light by the LED arrangements can now be completely dispensed with. The disclosure of all aforementioned documents is therefore expressly incorporated herein by reference.

This applies in particular to the time-dependent, preferably circadian control functions and their initialization in the context of an initialization procedure and / or the construction of an "adaptive" control in which after receiving a change signal from a user interface, the spectrum control curve is not only locally modified, but this local modification is at least partially automatically taken into account in a subsequent re-run of the spectrum control curve, as explained in detail in DE 10 2014 1 15 079.

This also applies to the use of a random control pattern (with the aid of random values and / or pseudo-random values and / or quasi-random values, ie with real or apparent random numbers generated for the control) for the spectrum control function and the grouping of several LED arrangements in different lighting modules, wherein in each case the LED arrangements of different lighting modules can be controlled using different module control functions and preferably one of the lighting modules is controlled so that a sky lighting scenario (in particular using a random control pattern) is simulated. This is explained in detail in DE 10 2014 1 15 082.

In the context of the present invention, the LED illumination system is also preferably designed such that it has a boost function or boost button offers the user interface, as explained in DE 10 2014 1 15 076. In this case, at least one LED arrangement for a predefined dose change period-unlike the actually predefined control function-is temporarily activated in response to a temporary short-term dose change signal called the "boost signal" which the user can actuate by actuating the "boost key" is driven so that it is operated at a predetermined minimum power or the proportion of the light of this LED array within the total light spectrum of the LED assemblies is a certain minimum proportion. After expiration of the predefined dosage change time period, the LED arrangements are controlled according to a predetermined control rule so that the total light spectrum or the total color temperature again corresponds to the predetermined spectrum control curve. For example, care can be taken to briefly increase, possibly maximize, the output of the melanopically-effective blue light portion, thus temporarily providing greater suppression of melatonin output, thereby increasing serotonin and making the user a little more awake and fresher. Conversely, the effective blue level can also be minimized by preferentially increasing the light of other frequencies, such as red light, to enhance the effect of melatonin and to calm it. In both cases, the user can react to unforeseen deviations in the daily routine by short-term conversion of the optimal for him set spectrum control curve.

Furthermore, a user interface can be constructed on the LED light in the form of an operating module, as described in DE 10 2014 1 15 085.

Likewise, as described in DE 10 2014 1 15 226, electronic protection elements, preferably bidirectional suppressor diodes, can be interposed on the LED arrays from a cooling surface of the LED to its anode or its cathode or to an electronic ground, if required to provide protection against overvoltages.

The invention will be explained in more detail below with reference to the accompanying figures with reference to embodiments. The same components are provided with identical reference numerals in the various figures. The figures are usually not to scale. Show it: 1 shows a block diagram of a possible electronic construction of a first exemplary embodiment of an LED lighting system with an exemplary embodiment of a control device according to the invention, FIG.

FIG. 2 shows a representation of a curative sensitivity curve which represents the spectral sensitivity of the human eye and a curve for the circadian effect function which indicates the action spectrum of the melanopsin photoreceptor of the eye or the melanopic spectral sensitivity of the human eye.

3 shows a block diagram of an exemplary embodiment of a light sensor arrangement, as can also be used in a control device according to the invention for an LED lighting system, FIG.

Figure 4 is a block diagram of a possible electronic construction of a second

Embodiment of an LED lighting system with an embodiment of a control device according to the invention,

Figure 5 is a very simplified schematic representation of an LED lamp as an example of an LED lighting system in which the control device according to the invention can be used.

The LED lighting system 100, whose block diagram is shown in FIG. 1, is a relatively simple LED lighting system 100 with a warm white LED arrangement L _w and a cold white LED arrangement L _k . Each of these LED arrays L _w , L _k may comprise a plurality of commonly energized LEDs. Here, the LED arrays L _w , L _k, for example, each consist of an LED group with a plurality of LEDs connected in series (not shown). The cool white LED array L _k contains LEDs that emit cold white light with a strong maximum in the blue region around 460 nm. For example, these may be LEDs of the XHP35 KW type from Cree. The warm white LED array L _w contains LEDs that emit more warm white light with a strong maximum in the yellow-red area around 600 nm. For example, these can be XHP35 WW LEDs from Cree.

In order to regulate the intensity of these LED arrays L _w , L _k to a predefinable value, a control device 1 is used. For each of the two LED arrays L _w , this comprises L _{k is} a separate control arrangement 2, with which it is ensured that the current l _w or I _{k is held} by the respective LED array L _w , L _k at a constant value, this in response to an intensity control signal IS _W , IS _{k is} specified. Both control arrangements 2 are constructed identically in principle.

Each of these control arrangements 2 comprises firstly a current sensor device 3, for example, a simple measuring resistor or shunt, with which the respective actual current l _w, l _k is measured by the respective LED array L _w, L _k. Output value of this current sensor device 3 is then an actual current signal U _w , U _k in the form of a voltage value which represents the current flowing through the LED array L _w , L _k each current l _w , l _k . This actual current signal U _w , U _k is applied to the input of a digitally programmable amplifier 4 of the respective control arrangement 2. This digitally programmable amplifier 4 is preferably a programmable gain amplifier 4 or a voltage amplifier with a digital potentiometer (hereinafter this programmable amplifier is also called "PGA" for short, irrespective of whether it is a programmable gain amplifier or a programmable gain amplifier) This amplifier amplifies the voltage value or the actual current signal Uw, U _{k in} each case with a specific amplification factor as a function of the intensity control signal IS _W , IS _k respectively given on an input of the PGA 4 provided for this purpose from the PGA 4 amplified respectively by the amplification factor, that is, modified actual current signal UM _W, UM _k is then passed as a feedback value to a constant current source 5, which in accordance with the current l _w, l _k by the respective LED array L _w, L _k in these control arrangements is thus determined by the gain of the measured Actual current signal U _w , U _k according to the gain of the current controller 5, another actual current signal UM _W to _{k played} , as it actually exists, whereupon the current controller 5 according to its control function, the actual flowing current l _w , l _k changed accordingly. In a preferred gain factor> 1 of the PGA 4 to the current controller 5, a higher actual power signal UM _W, UM _k played and therefore the current l _w, l _k correspondingly reduced, that is, the respective LED array L _w, L _k dimmed , In principle, however, it would also be possible to predefine an amplification factor <1 for the PGA 4, which would then ensure that the current I _w , I _k is correspondingly increased by the LED arrangement L _w , L _k .

As already mentioned above, each of the current sensor device 3 and the constant current source 5 can be conventional components that are commercially available at low cost. Due to the fact that the only interference with the Gelschleife done with the aid of the amplifier 4, which is interposed between the current sensor device 3 and the constant current regulator 5 respectively, it is not necessary to intervene in the inner workings of these components 3, 5. Also, a corresponding PGA 4 is inexpensive available as a finished component.

With the help of the control arrangement 2 can thus be ensured that the respective LED arrays L _w , L _k are supplied with a defined constant current l _w , l _k , which is determined only by the intensity control signal IS _W , IS _k , which is the PGA 4 is specified. As long as this intensity _{control signal} IS _W , IS _{k is} constant, and the current l _w2 , l _k by the respective LED array L _w , L _{k is} constant.

The intensity control signals IS _W , IS _k are digital signals with which the PGAs 4 are programmed. For this purpose, the PGAs 4 each with a bus input, preferably SPI or I2C, connected to the bus 12, which in turn is connected to a control unit 10, here in the form of a programmable microcontroller 10. Via this bus 12, the digital intensity control signals IS _W , IS _k are respectively transferred to the PGAs 4 of the individual control arrangements 2 for the different LED arrangements L _w . The system is, as will be shown later in connection with Figure 4, scalable, ie it can be connected to the bus 12 almost any number of LED arrays L _w , L _k each with its own control arrangements 2.

In the microcontroller 10 required for the individual LED arrays L _w, L _k intensity control values are IS _W, calculated IS _k in accordance with predetermined rules so that for example, the output "total light" that is, the mixture of the two LED arrays L _w, has L _k output light, a desired overall brightness and a desired overall color temperature (within the possible limits). in particular, this is the blue part of the total light can also be set. As described above, while the specification can be performed by a user, ie it can concrete values for By means of the microcontroller 10, however, it is also possible to control or regulate the current overall brightness and overall color temperature in accordance with a spectrum control function specified by the user and / or preset spectral control curve, in particular a spectrum control curve diane curve, as discussed above. To specify the various parameters, eg. B. direct current values for the total brightness and / or total color temperature or the parameter values for the Spectrum control function, the control unit 10 may be connected by signal technology to a user interface. This is possible, for example, via any wireless interface, here for example a Bluetooth interface 13, which establishes a connection to a smartphone of the user, on which a corresponding app is installed as a user interface or remote control, where the user, for example, a spectrum Control function can select and / or modify, can specify concrete current values, can set the boost mode, etc.

In addition, the LED lighting system also has a device-specific user interface with control buttons 14, only one of which is shown here. Further parameters which can be used to calculate the current intensity control signals IS _W , IS _k can come from sensors 15 which, for example, measure environmental parameters. In the present case, as an example, a proximity sensor, specifically a radar sensor 15, is used, which determines whether there is an area around the LED lighting system 100 (that is, for example, in the room where the LED lighting system 100 is located). even a user stops, or whether the LED lighting system 100 can be turned off completely. Other sensors are also possible.

Two further sensors here are different light sensor arrangements 20 _w , 20 _m , one of the light sensor arrangements 20 _w serving to measure the total light in space, including the light emitted by the LED arrangements L _w , L _k itself, ie an overall intensity value, and the other light sensor serves 20 _m to measure the blue component in this light. In this case, it is ensured that the light measured by the first light sensor arrangement 20 _{w is} weighted with the spectral eye sensitivity of the human eye or that only a physical radiation power weighted with this spectral sensitivity of the human eye is measured. This is possible with, for example, the silicon photodiode BPW21 from Osram. She has already integrated the required optical filter. One of these spectral sensitivity of the eye reflecting so-called "luminosity function" (international spectral luminous efficiency curve) ν (λ) is shown in Figure 2 (relative values). This first light sensor assembly 20 _w can therefore be referred to as illuminance sensor 20 _w. The second light sensor arrangement By contrast, 20 _m for the measurement of the blue component or blue light component acts as a melanopic light sensor 20 _m since it essentially the proportion of light corresponding to the melanopic spectral sensitivity of the human eye was detected. For the evaluation of the biological effectiveness of light sources, the action spectrum of the melanopsin photoreceptor for the circadian effect function s _me i (A) is used today. The corresponding curve is also shown in FIG. 2 (relative values). Again, there are commercially available photo-sensors and optical filters, the _m corresponding to at least approximately this curve s ei (A) or a good approximation are, for example, the photodiode of the type S6482 Hamamatsu, also with integrated optical filters. The curves in Figure 2 are taken from the publication "licht.wissen 19", Effects of Light on Humans, page 21, Figure 26, the Fördergemeinschaft Gutes Licht, Frankfurt am Main, March 2014. In other publications, the circadian effect function is still slightly shifted towards shorter wavelengths with a maximum at about 455 nm.

With the aid of these two light sensor arrangements 20 _w , 20 _m , it is now possible to provide (if the sensor elements of the light sensor arrangements 20 _w , 20 _m are positioned at appropriate locations), the total light to which the user is exposed, corresponding to the total intensity value and according to the melanopically effective blue light component. If, for example, the ambient light decreases, it can be ensured that the total brightness of the light emitted by the two LED arrays L _w , L _{k is} increased in order to compensate for the decrease in the ambient light and to restore a total brightness value predetermined according to a spectrum control function to reach. The same applies if the ambient light increases. With the help of the melanopic light sensor 20 _{m it} can be ensured that, when the blue light component decreases, care is taken with the aid of the control device 10 that the cold white LED arrangement L _{k is operated} with a higher current and therefore more blue light component in the total light of the LED Lighting system 100 is included. In order to keep the total intensity value constant, can be reduced by the warm white LED array _w L corresponding to the current. Conversely, if the melanopically effective blue light component is undesirably increased, the current through the warm white LED array L _w increases and decreases correspondingly by the cold white LED array L _k , to reduce the increase in the blue light level by changing the overall color temperature of the light to compensate by the control device 1 controlled LED lighting system 100. The light sensor arrangements can be arranged both in the luminaire, eg behind a window of the operating unit 106, or else as an external, preferably portable component or in a portable, network-independent pending, possibly battery-operated control unit. It can for example be positioned on the workstation, desk or in the illuminated room. In this case, the sensor arrangements or the operating unit with the light (s) preferably communicated wirelessly via Bluetooth low energy or WLAN.

_W for detecting the respective measured values or signals from the operation buttons 14 of the user interface, the further sensors 15 and the light sensor assemblies 20, 20 _m could be the microcontroller which each A / D converter, to apply the analog signals and then digital to process or it could be upstream of corresponding A D converter. Preferably, however, both the light measurement value LM _{W of} the illuminance sensor 20 _w and the light measurement value LM _{m of} the melanopic light sensor 20 _m and also the user input value BW from the operating keys 14 of the user interface or the further signal values AW, for example a presence signal value AW of a radar sensor 15 or the like, output in the form of frequency signals. The values or signals LM _W, LM _m, BW, AW be this example, first received, which converts the frequency signals by means of time division multiplexing in a common signal FS which is applied to an input of the control unit 10 to a multiplexer 1. 1 Thus, the entire system is relatively easy scalable also on the part of the input signals for the control unit 10, ie it can be queried with little effort any number of light sensor devices 20 _w , 20 _m , control buttons 14 and other sensors 15 and processed their measurements or input values digitally and be considered in the calculation of the current intensity control signals IS _W , IS _k .

An example of a preferred possible construction of a light sensor arrangement 20, which outputs the measured light value LM measured by a light sensor element D-1, here a photodiode D-1, in the form of a frequency signal, is shown in FIG. Conventional illuminance sensors normally convert the photocurrent of the photodiode 1 into a proportional voltage. In the light sensor electronics 21 in Figure 3, which is also used in the light sensor arrays 20 _w , 20 _{m of} Figure 1, an integrator circuit 22 is used in combination with a Schmitt trigger 23 instead and thus converted photocurrent into a proportional frequency. The integrator circuit 22 is constructed with an operational amplifier 01 whose output is connected via a capacitor C to an inverting input of the operational amplifier 01. At this inverting input and the photodiode D1 is permanently in the reverse direction against a constant defined bias voltage U _v in connected to an order of 5 volts. Alternatively, the photodiode can also be operated in the photovoltaic range, ie without bias. If light falls on the photodiode D1, a corresponding photocurrent IP flows, whereby the photocurrent is integrated via the integration capacitor C of the integrator with the operational amplifier 01 and correspondingly at the output of the operational amplifier 01 a voltage proportional to the integrated photocurrent applied until the switching threshold of the downstream Schmitt- Triggers 23 is achieved.

The output of the integrator circuit 22 (or of the operational amplifier 01 of this integrator circuit 22) is connected to the input of the Schmitt trigger 23 whose circuit has a resistor R2 on the input side, which is connected upstream of a non-inverting input of a further operational amplifier 02. Here, the inverting input of the operational amplifier 02 is connected to ground M and the output of the operational amplifier 0 _{2 of} the Schmitt trigger 23 is connected in a conventional manner via a resistor R3 to the non-inverting input. In addition, the output of the inverting Schmitt trigger via a further resistor R1 and a reverse diode D2 is switched back to the non-inverting input of the operational amplifier 01 of the integrator circuit 22.

The operational amplifiers 01, 02 are each connected to a positive supply voltage + UB and a negative supply voltage -UB.

This circuit of the light sensor electronics 21 functions as follows: The photodiode D1 is here as mentioned permanently in the reverse direction against a constant defined reverse voltage U _v connected. The photocurrent IP, which is caused by the incidence of light, thereby flows continuously and unidirectionally. This photocurrent IP is integrated with positive output voltage Ua in the inverting integrator circuit 22, because in this case the diode D2 is blocking. The integrator output voltage is applied to the input of the non-inverting Schmitt trigger 23, wherein the output voltage of the Schmitt trigger 23 at the output of the operational amplifier 02 is used again as input voltage for the integrator circuit 22. If the output voltage of the inverting integrator circuit 22 reaches the negative threshold voltage of the Schmitt trigger 23, this is calculated as Ua R2 / R3, its output voltage is switched back to the negative output voltage, this is at least approximately equal to the supply voltage of the operational amplifier, and the integration in the Integrator circuit 22 takes place in the reverse direction. In this case, the Diode D2 and it is very quickly integrated back again via the small resistor R1 until the negative threshold voltage of the Schmitt trigger 23 is reached. Then the output voltage at the output of the Schmitt trigger 23 becomes positive again and the process starts again. As already stated, the back integration takes place very quickly by the feedback of the output of the Schmitt trigger 23 to the inverting input of the integrator circuit 22 via the resistor R1 and a diode D2. Thus, at the output of the Schmitt trigger 23, the measured light value of the photodiode D1 in the form of a desired frequency signal, more precisely, in the form of a rectangular signal whose frequency of the high time to the photocurrent IP is proportional, the low-time negligible is. The frequency is thus at least approximately proportional to the photocurrent.

This square wave signal can be read out via the input capture register of the microcontroller 10 or, in the case shown in FIG. 1, first time multiplexed in the multiplexer with other corresponding signals and then via the said input capture register as a total signal FS with the other Signals are read. Within the microcontroller 10, the signals can then be demultiplexed digitally.

The integration of the photocurrent IP and thus the high time of the output signal of the Schmitt trigger are only dependent on the capacitance of the integration capacitor C, the photocurrent IP of the photodiode D1 or the proportional to illuminance and dependent on the resistance ratio R2 / R3 and the output voltage Ua of the Schmitt trigger Since these are constant, the illuminance is directly proportional to the frequency, ie the higher the photocurrent IP, the higher the frequency.

Similarly, the signal of a proximity sensor, e.g. As the radar sensor 15, or other sensor are converted into a frequency. The same applies to the control keys or key sensors 14 of a user interface, in which it is advantageous in any case, the individual signals via an analog multiplexer 1 1, as shown in Figure 1, summarize and to the control unit 10 and the microcontroller. transfer controller 10. FIG. 4 shows a further exemplary embodiment of a control device 1 for an LED lighting system 100, wherein only the concept shown in FIG. 1 has been extended by further LED arrangements L _w2 , L _k2 , L _b , L _a . The two LED arrays L _w , L _k can advantageously be used for direct light components, the other LED arrays L _w2 , L _k2 , L _b , L _a for indirect light components. The control unit 10 (ie, the microcontroller 10) can be constructed in the same way as in the embodiment of FIG 1, except that here the program may be slightly different, since now the intensity _{control signals} IS _W , IS _k , IS _W 2, IS _k2 , IS _b, is _a calculated for a greater number of LED arrays L _w, L _k, L _w2, L _k2, L _b, L _a, and via the bus 12 to the respective control units 2 of the individual LED arrays L _w, L _k , L _w2 , L _k2 , L _b , L _a must be handed over. In that regard, the input-side components of the control unit 10, so for example the Bluetooth interface 13, the multiplexer 1 1 and the control buttons connected thereto 14, sensors 15 and light sensor assemblies 20 _w , 20 _m as in the embodiment of Figure 1 can be constructed.

Likewise, the control devices 2 for the individual LED arrays L _w, L _k, L _w2, L _k2, L _b, L _a are constructed in the same way as the control devices 2 in the embodiment shown in Figure 1, ie they each have a current sensor assembly 3 on, with the current current l _w , l _k , l _w2 , l _k2 , l _b , l _a by the LED arrays L _w , L _k , L _w2 , L _k2 , L _b , L _{a is} measured and a corresponding actual current signal U _w , U _k , U _W 2, U _k2 , U _b , U _{a is} generated in the form of a voltage _value . This voltage value is then transferred each to a PGA 4 of the respective regulating arrangement 2, which in dependence of the obtained over the bus 12 from the control unit 10 intensity control signal IS _W, IS _k, IS _W 2, IS _k2, ISb, IS _a, the actual current signal U _w, U _k U _W 2, U _K2, U _b, U _a modified (for example, amplified) and the so modified actual current signal UM _w to _K to _w2, UM _k2, UM _b, UM _a to a constant current regulator 5 of the respective control arrangement 2 passes, which then in accordance with the current flowing through the LED arrays L _w , L _k , L _w2 , L _k2 , L _b , L _a current l _w , l _k , l _w2 , l _k2, l _b, l _a regulated to the desired value.

In the exemplary embodiment according to FIG. 4, the LED arrangements L _w , L _k respectively shown above and below in the circuit diagram can again be the same LED arrangements L _w , L _k as have been explained in connection with FIG. Together they can form a first lighting module 51, which outputs white light with an adjustable color temperature between cool white and warm white. The additional LED arrays L _w2 , L _k2 , L _b , L _a can serve as separately or independently of the first light module 51 adjustable second light module 52, for example, to produce a ceiling lighting, in particular with a sky simulation. This second lighting module 52 comprises a further warm white LED arrangement L _w2 and a further cold white LED arrangement L _k2 , as described above for FIG. 1, as well as additionally a blue LED arrangement L _b (eg LEDs of FIG Type Cree XQE blue or Lumiled Luxeon Rebel Cyan or the like) and an amber LED array L _a (such as Cree XQE amber LEDs, Luxeon Rebel PC Amber LEDs or the like). In this case, the first lighting module 51 can be arranged on the LED light such that it radiates downward into a spatial area in which the user resides, and the second LED arrangement 52 is directed upward, for example. In a particularly preferred embodiment, light is coupled into a planar light guide (not shown) via at least one of its edges via the second LED arrangement, and the light mixed therein is preferably coupled out upwards in the direction of the ceiling. For this purpose, the planar light guide is provided with suitable microlenses or introduced into the surface light guide, preferably embossed (micro) coupling-out.

A corresponding possible mechanical structure of such an LED illumination system 100 is shown schematically in FIG. 5 on the basis of an exemplary embodiment in the form of an LED luminaire 100, here in particular a floor lamp. This can be regulated by the control device in FIG.

The LED luminaire 100 comprises a luminous head 50, which here has two light modules 51, 52 each having a plurality of LED arrangements for light generation. A light module 51 is directed in the normal position of use of the light head 50 down. Here, as described above, this "lower" lighting module 51 has a warm-white LED arrangement L _w and a cold-white LED arrangement L _k , each having an LED pair with two individual, series-connected LEDs (not shown) serves for uniform illumination of a work area.

A second, "upper" lighting module 52 is located on the light head 50 so that it radiates its light upwards against the ceiling or the upper area of the walls of the room in the normal position of the light head 50. In a particularly advantageous embodiment, the light of the light module 52 by edge feed into the microstructured light guide surface (not shown) coupled and from this via the micro- structures mainly radiated upwards against the ceiling and the upper areas of the walls. This light-emitting module 52 comprises as mentioned a cold white LED array L _k2 and a warm white LED array L _w2 and, additionally, a LED array L _b which radiates predominantly blue light, and an LED array L _a, the strong amber-colored light radiates ,

The LED arrays L _w, L _k, L _w2, _k2 L, L _b, L _a are each in the light modules 51, 52 to a LED board, for example, a metal core board (not shown) soldered. In addition to the LEDs arranged on the circuit board, the lighting modules 51, 52 also each comprise a reflector arrangement or lens or planar light conductor arrangements with surface-distributed outcoupling elements, via which the light is radiated in a specific emission angle, and possibly (preferably at least in the lower lighting module 51) Deflection structure eg as a microlens and / or a diffuser assembly, or the like in the simplest form as an opal disc, which scatters the light emitted from the various LEDs of the LED arrays L _w , L _k , L _w2 , L _k2 , L _b , L _a , well mixed and aligned so that a surface illuminated with it is evenly illuminated. In addition, the lighting modules 51, 52 have suitable means to provide for dissipating the excess heat, such as cooling fins, Hepipes or the like.

The light head 50 is here arranged on an arm 101, which is optionally connected via a pivot joint 102 with an upper end of a lamp stem 103. The light stick 103 of the LED light 100 is fixed to the bottom of a foot 104. About the pivot joint 102, the lamp head 50 can pivot about a first axis upwards. About an additional pivot 105 of this lamp head 50 is tilted about a further axis which is perpendicular to the pivot axis of the pivot joint 102. As a result, the position of the lighting modules 51, 52 or their emission direction in space could be changed, whereby they always radiate in opposite directions due to their positioning on the light head 50.

For setting, adjusting and changing and - if desired - keeping constant the total brightness and total color temperature of the light modules 51, 52 each total emitted light serves as mentioned the control device 1. This control device 1 is housed here in the housing of the LED lamp 100, this is shown only schematically in Figure 5 as a block in the region of the lamp stem 103. In fact, the individual components of the control device 1 can also be distributed in the housing be. For example, the control unit 10 may be arranged at any point in the lamp stem 103, and the individual control arrangements 2 for the various LED arrangements L _w , L _k , L _w2 , L _k2 , L _b , L _a are respectively in the vicinity of the lighting modules 51, 52 arranged in the lamp head 50. By using a digital bus 12, the wiring to these individual control arrangements 2 is not very complicated. A control module 106 is located at a suitable height on the light arm 103 as a user interface with a number of capacitively acting "control buttons" 14 which are signal-technically coupled to the control unit 10 of the control device 1 (as described in connection with FIGS. 1 and 4) Operating module 106 can be manually operated by a user by touching a control surface.For the possible structure of such an operating module, reference is again made to DE 10 2014 1 15 085. In an advantageous embodiment, operating module 106 includes control unit / microcontroller 10 , the multiplexer 1 1, the control buttons 14, the light sensor assemblies 20, the proximity sensor / radar sensor 15, and possibly other sensors via the SPI or I2C or other, possibly also wireless bus, the control unit communicates with the lamp head 101, in the constant current sources 5 with the current sensor means 3 and the PGAs 4 angeor dnet are.

It is finally pointed out once again that the devices described in detail above are only exemplary embodiments which can be modified by the person skilled in many different ways without departing from the scope of the invention. Thus, the illustrated LED lamp 100 is still a relatively simple embodiment with only one light head 50. The LED lamp 100 could also have a plurality of light heads or even more lighting modules, for example as a floor lamp a double head in different directions down , Likewise, it is also possible that a radiation direction is directed as a wallwasher from a light head to the side. All lighting modules can preferably be operated either independently or in combination. In addition, the special features of the variants described above can also be combined with each other. Furthermore, the use of the indefinite article "on" or "one" does not exclude that the characteristics in question may also be present multiple times. LIST OF REFERENCE NUMBERS

1 control device

2 control arrangement

3 current sensor device

4 amplifiers / PGA

5 constant current source

10 control unit / microcontroller

1 1 multiplexer

12 bus

13 wireless interface / Bluetooth interface

14 control button

15 proximity sensor / radar sensor

20 light sensor arrangement

20 _w light sensor arrangement / illuminance sensor 20 _m light sensor arrangement / melanopic light sensor

21 light sensor electronics

22 integrator circuit

23 Schmitt triggers

50 light head

51 light module

52 light module

100 LED lighting system / LED light

101 arm

102 swivel joint

103 light stems

104 feet

105 pivot

106 operating module

AW Presence signal value

BW user input value

LM, LM _W , LM _m light reading

L _k cold white LED arrangement

L _w warm white LED arrangement

L _{k2 cool} white LED arrangement

L _w2 warm white LED arrangement l_ _b blue LED array

L _a amber-colored LED arrangement

L, Ik, Iw2, Ik2 _> lb> Electricity

IS _W , IS _k , IS _w2 , IS _k 2, IS _b , IS _a intensity _{control signal}

U _w , U _k , U _w2 , U _k 2, U _b , U _a actual current signal

UM _W! U Mk, UM _w2 , UM _k 2, U Mb, UM _a modified actual current signal ν (λ) spectral curvature curve

s _m ei (A) circadian action function

C capacitor

Light sensor element / photodiode

D2 diode

FS total signal

I P photocurrent

M mass

01 operational amplifier

02 operational amplifier

R1 resistance

R2 resistance

R3 resistance

U _v blocking voltage

+ U _b positive supply voltage

-U _b negative supply voltage

Claims

claims

1 . Control device (1) for controlling an LED arrangement (L _w , L _k , L _w2 , L _k2 , L _b , L _a ) with

a current sensor device (3), which is thus coupled to the LED arrangement (L _w , L _k , L _{w 2} , L _k2 , L _b , L _a ) and designed such that it receives a _light through the LED arrangement (L _w , L _k , L _w2 , L _k2 , L _b , L _a ) current flowing (l _w , l _k , l _w2 , l _k2 , l _b , l _a ) and this current (l _w , l _k , Iw2, Ik2, lb,) representing actual current signal (U _w , U _k , U _W 2, U _k2 , U _b , U _a ),

- A, preferably programmable, amplifier (4), which is designed so that it from the current sensor means (3) coming actual current signal (U _w , U _k , U _W 2, U _k2 , U _b , U _a ) is modified with an amplification _{factor selected} as a function of an intensity _{control signal} (IS _W , IS _k , IS _W 2, IS _k 2, IS _b , IS _a ),

- And a constant current _source (5) which is formed so that it, using the modified actual current signal (UM _W , UM _k , _{um w2} , _{um k2} , _um _b , _um _a ), the LED array (L _w , L _k , L _w2 , L _k2 , L _b , L _a ) are supplied with a defined current (I _w , I _k , I _w2 , I _k2 , I _b , I _a ).

2. Control device according to claim 1, wherein the programmable amplifier (4) comprises a programmable gate amplifier (4).

3. Control device according to claim 1 or 2, with at least one light sensor arrangement (20, 20 _w , 20 _m ) and a control unit (10) which is designed so that it is based on at least one of the light sensor arrangement (20, 20 _w , 20 generates _m) determined light measurement value (LM, LM _W, LM _m) and optionally a user input value (BW), an intensity control signal (IS _W, IS _k, IS _W 2, IS _k2, IS _b, IS _a), which (to the amplifier 4 ) is given.

4. Control device for controlling an LED arrangement (L _w , L _k , L _w2 , L _k2 , L _b , L _a ), in particular according to claim 3, with a light sensor arrangement (20, 20 _w , 20 _m ) and a control unit ( 10), wherein the light sensor arrangement (20, 20 _f, 20 _m) has at least one light sensor element (D1) and at least one light sensor electronics (21) which is so formed to _W (from the light sensor element D1) measured light values (LM, LM , LM _m ) in the form of frequency signals to the control unit (10) passes.

5. Control device according to claim 4, wherein the light sensor electronics (21) comprises an integrator circuit (22) in order to integrate the measured values (IP) respectively measured by the light sensor element (D1) over a period of time.

6. Control device according to one of claims 4 or 5, comprising a multiplexer (1: 1), which is formed to project from a light sensor arrangement (20, 20 _f, 20 _m) in the form of frequency signals coming light measurement values (LM, LM _W, LM _m ) and / or to multiplex user input values (BW) and / or sensor values (AW) coming from a user interface (14) and / or from another sensor (15) in the form of frequency signals and forward them to the control unit (10).

7. LED lighting system (100), in particular LED lamp (100), with at least one LED arrangement (L _w , L _k , L _w2 , L _k2 , L _b , L _a ) and a control device (1) after one of the preceding claims.

8. LED lighting system according to claim 7, with at least two LED arrays (L _w , L _k , L _w2 , L _k2 , L _b , L _a ), which emit light in different color temperatures, preferably with at least one warm white LED arrangement (L _w, L _w2) and a cold white LED array (L _k, L _k2).

9. LED lighting system according to claim 8, with at least two light sensor arrangements (20 _w , 20 _m ), wherein the control device (1) is formed so that in response to first light readings (LM _W ), the first of a light sensor array (20 _w ) of the light sensor arrangements (20 _w , 20 _m ), an overall intensity of the light emitted by the at least two LED arrays (L _w , L _k , L _w2 , L _k2 , L _b , L _a ) is regulated, and in dependence of second light measurement values (LM _m ) which are determined by a second light sensor arrangement (20 _m ) of the light sensor arrangements (20 _w , 20 _m ), the ratio of the intensities of the respectively of the individual of the at least two LED arrangements (L _w , L _k , L _w2, _k2 L, L _b, L _a) the emitted light is controlled.

10. The LED lighting system according to claim 9, wherein the first light sensor array (20 _w ) of the light sensor arrays (20 _w , 20 _m ) is adapted to determine a light reading (LM _W ) indicative of the intensity of the total light in an environment of the LED illumination system (100) and the second light sensor arrangement (20 _m ) of the light sensor assemblies (20 _w , 20 _m ) is designed so that it determines a light reading (20 _m ) representing a proportion of the total light in a defined blue spectral range.

1 1. LED lighting system according to one of the preceding claims with at least one further LED array (L _w2 , L _k2 , L _b , L _a ), preferably another warm white (L _w2 ) LED array and / or another cold white LED array (L _k2 ) and / or a blue LED array (L _b ) and / or an amber LED array (L _a ).

12. A method for controlling an LED array (L _w , L _k , L _w2 , L _k2 , L _b , L _a ), wherein a by the LED array (L _w , L _k , L _w2 , L _k2 , L _b , L _a ) current flowing (l _w , l _k , l _w2 , l _k2 , l _b , l _a ) is measured and this current (l _w , l _k , l _w2 , l _k2 , l _b , l _a ) Representing actual current signal (U _w , U _k , U _W 2, U _k2 , U _b , U _a ) is generated in a, preferably programmable, amplifier (4) this actual current signal (U _w , U _k, U _W 2, U _K2, U _b, U _a) to one (in response to an intensity control signal iS _W, iS _k, iS _W 2, iS _k2, iS, iS _a) selected gain factor is modified _b and by means of a constant-current source (5) using the modified actual current signal (UM _W , UM _k , _{um w2} , _{um k2} , _um _b , _um _a ) the LED array (L _w , L _k , L _w2 , L _k2 , L _b , L _a ) with a defined current (l _w , l _k , l _w2 , l _k2 , l _b , l _a ) is supplied.

13. Use of a control device (1) according to one of claims 1 to 6, for controlling the overall intensity and the total light spectrum of the light of an LED lighting system (100), in particular an LED light (100), with at least two LED arrays (L _w, L _k, L _w2, _k2 L, L _b, L _a), which emit light with different color temperatures.