EP2375858A1 - Electronic switch for measuring light in an emergency light using light diodes - Google Patents

Abstract

The circuit (2) i.e. light sensor module, has a light sensor (4) producing an electrical signal (17) according to a luminous flux of LEDs. An electronic controller i.e. digital controller (6), processes the signal. An electronic switch (5) interrupts a power supply (14) of the LEDs. A storage circuit has a diode (10) and a capacitor (11) for storing energy from the supply at a predetermined time. The switch is switched-on and off in a predetermined sequence to transmit a value of the signal during processing of the signal, where the signal is digitally coded as feedback signal by the switch.

Description

The invention relates to the field of electric emergency lights. It relates to an electronic circuit for the light measurement of light-emitting diodes used in an emergency light, as well as to a skin-tone module for powering light-emitting diodes, in each case according to the preamble of the corresponding independent patent claims.

STATE OF THE ART

In so-called single-battery LED emergency lights, light-emitting diodes (LEDs) are used as lighting means. Since such emergency lights are considered as emergency lights, such lights must be checked regularly. In the emergency lighting of a building, there are standards that precisely determine the minimum light intensity of the rescue route lighting or markings.

In emergency lighting, LEDs are used more and more frequently. In today's LED technology, the light intensity decreases depending on the temperature constantly. This means that from a certain period of operation, the light intensity is too low or the standard is no longer met. Because the light emitting diodes still produce light, it is difficult for the operator to know from when the standard is no longer met. This means that a regular measurement of the light intensity supplied by the LEDs is required. Since the LEDs, unlike other light sources, draw the same electrical power from their supply (ie same voltage x same current), whether they are new or provide a lot of light or worn out or provide too little light, it is difficult Luminous intensity of the LED or its wear derive from electrical measurements.

In a single-battery LED emergency light, there is a main module, with which all the necessary functions are performed. To measure the luminous intensity of the LEDs, standard light sensors (photo diodes, photo transistors or special integrated circuits) are installed next to the LEDs. The measurement is transmitted to the main module as a digital or analogue signal. In the main module, this measurement is compared with a minimum value, and if necessary the light is switched off and / or the faulty state is signaled locally or reported remotely.

With this conventional solution, there is an additional connection in the luminaire which the light sensor connects to the main module. The main module must be adapted so that the signal transmitted by the light sensor can be processed. This means that there is a constructive or hardware difference between a normal main module without light measurement and one with light measurement.

PRESENTATION OF THE INVENTION

It is therefore an object of the invention to provide an electronic circuit for the light measurement of light emitting diodes used in an emergency, and a Hautptmodul for feeding light emitting diodes of the aforementioned type, which overcomes the disadvantages mentioned above.

This object is achieved by an electronic circuit for the light measurement of light-emitting diodes used in an emergency luminaire, as well as a skin-type module for supplying light-emitting diodes with the features of the corresponding independent patent claims.

• einen Lichtsensor, welcher ein Teil des Lichtstromes der Leuchtdioden misst und ein entsprechendes elektrisches Signal generiert,
• eine elektronische Steuerung, welche dieses elektrische Signal bearbeitet und bewertet,
• entweder einen elektronischen Schalter, mit welchem die Versorgung der Leuchtdioden unterbrochen werden kann, oder einen elektronischen Schalter, mit welchem die Versorgung der Leuchtdioden kurzgeschlossen werden kann.

Dabei ist die Schaltung dazu ausgelegt, bei einer Bewertung des elektrischen Signal entsprechend eines vorgegebenen Kriteriums durch die elektronische Steuerung den elektronischen Schalter anzusteuern und dadurch die Versorgung der Leuchtdioden zu unterbrechen respektive kurzzuschliessen.In such an electronic circuit for the light measurement of light emitting diodes used in an emergency light,
Thus, the circuit is powered by a supply of light emitting diodes, and has the following elements:

• a light sensor which measures a part of the luminous flux of the light-emitting diodes and generates a corresponding electrical signal,
• an electronic controller which processes and evaluates this electrical signal,
• either an electronic switch, with which the supply of light-emitting diodes can be interrupted, or an electronic switch, with which the supply of the light-emitting diodes can be short-circuited.

In this case, the circuit is adapted to control the electronic switch in an evaluation of the electrical signal according to a predetermined criterion by the electronic control and thereby interrupt the supply of the light-emitting diodes respectively short-circuit.

In a preferred embodiment of the invention, the electronic switch, typically a transistor or other semiconductor switch, is arranged in the circuit such that it can interrupt the supply of the light emitting diodes, preferably by being connected in series with the light emitting diodes. This interruption is detectable in a feeding main module, so that on the one hand by the main module to a permanent interruption can be reacted (for example by an alarm or a display), or on the other hand by a Sequence of pulsed interruptions a coded signal is transmitted to the main module.

In another preferred embodiment of the invention, the electronic switch is arranged to short-circuit the supply (possibly also via a resistor of known size). In this embodiment too, signals or information can be transmitted to the main module as a result of the short-circuiting. The following explanations therefore apply mutatis mutandis to this embodiment.

The invention thus relates to an automatic self-diagnosis of the light intensity, which is supplied by the built-in lights in the emergency light emitting diodes.

With an intelligent light sensor module, which is mounted in the emergency light next to the LEDs, the light intensity is measured. If this light intensity is too low, the LED supply is interrupted with the same module. With the main module, which controls the emergency light in both mains and emergency operation, this line interruption is registered and interpreted as a "low light intensity" state. With a preprogrammed strategy, a corresponding behavior is triggered via the main module.

The light sensor module is supplied with the same voltage parallel to the LEDs. The communication between the main and the light sensor module via this single two-pole LED power supply. In a selectable operating state, the light sensor module can measure the light and optionally interrupt the LED line if the light intensity is too low, or in a single communication protocol in which the LED supply is switched on and off do not carry out the light measurement or interrupt the LED cable in any other operating state. In this protocol it is also possible to transfer a the measured value of the light intensity. In this case, the light sensor module turns off the LED power in a particular sequence and on, which sequence replicates the measured light intensity value digitally encoded so that this value is transmitted to the main module.

With the invention it is possible to use the same main module hardware for luminaires with or without light sensor. The difference then lies solely in the programming of the main module, i. in the software.

With the invention, the light sensor is located on an intelligent light sensor module with which the light measurement is evaluated and, in the case of too small a value, the connection from the main module to the light emitting diodes can be interrupted.

• Das intelligente Lichtsensormodul muss zuerst neben den LEDs befestigt werden (damit das Licht gemessen werden kann).
• Die 2-polige Verbindung vom Hauptmodul zu den LEDs, welche für die Versorgung der LEDs vorgesehen ist, ist dann an das Lichtsensormodul statt an die LEDs angeschlossen. Die LEDs werden nur mit dem Lichtsensormodul verbunden.

It is thus very easy to convert an emergency light without light measurement into an emergency light with light measurement:

• The smart light sensor module must first be mounted next to the LEDs (so that the light can be measured).
• The 2-pole connection from the main module to the LEDs, which is intended to supply the LEDs, is then connected to the light sensor module instead of the LEDs. The LEDs are only connected to the light sensor module.

In a preferred embodiment of the invention, when the electronic controller is switched on, the electronic switch is switched on by the supply, preferably via a current source connected to the supply. Thus, a quick turn on is possible without having to wait for the startup of a digital processor unit, which ultimately controls the electronic switch.

In a preferred embodiment of the invention, the electronic circuit is adapted, in the processing of the electrical signal by a digital electronic control, the electronic switch in a particular sequence, which digitally encodes the value of the electrical signal as a feedback signal for transmitting the value of the electrical signal turn off and on. Thus, a value for the brightness of the LEDs can be transmitted via the supply line.

In a preferred embodiment of the invention, the electronic circuit is adapted, during the processing of the electrical signal by the digital electronic controller, to transmit the state of processing to the electronic switch in a specific sequence which digitally codes the state of processing as a feedback signal. and turn it on. Thus, a state such as, for example, "first limit value for brightness undershot" can be transmitted.

In a preferred embodiment of the invention, the circuit uses limit values in the evaluation of the electrical signal, wherein these limits are generated or can be generated by means of a calibration. Thus, the limits, for example, during production or commissioning, the light intensity of the LED array used and / or any variances of the measuring device can be adjusted.

In a preferred embodiment of the invention, the circuit uses limits in the evaluation of the electrical signal, these limits being preprogrammed in the digital controller. This allows standardized limits to be used across a series of luminaires.

In a preferred embodiment of the invention, the circuit can receive energy from the supply by means of a memory circuit for a certain time the circuit can detect the voltage of the supply, and the circuit is able to receive a sequence of off and on of the supply as signals and convert it into one of a plurality of control signals.

• einen Warte-Zustand, bei welchem unabhängig von der Lichtmessung der in den Leuchtdioden fliessende Strom nicht unterbrochen wird.
• einen Test-Zustand, bei welchem in Abhängigkeit der Lichtmessung der in den Leuchtdioden fliessende Strom unterbrochen werden kann. Dieses Unterbrechen geschieht vorzugsweise durch die Schaltung selber, beispielsweise durch Schalten des in Serie oder parallel zu den Leuchtdioden angeordneten elektronischen Schalters.
• einen Mess-Zustand, bei welchem in Abhängigkeit der Lichtmessung der elektronische Schalter zur Übermittlung des Wertes des elektrischen Signals an das Hauptmodul ein- und ausgeschaltet wird.
• einen Kommunikations-Zustand, bei welchem in Abhängigkeit der Lichtmessung der elektronische Schalter zur Übermittlung des Zustands der Bearbeitung an das Hauptmodul ein- und ausgeschaltet wird.

In a preferred embodiment of the invention, the circuit may be selectively switched to at least one of the following states with one of the plurality of control signals:

• a waiting state in which, regardless of the light measurement of the current flowing in the LEDs current is not interrupted.
• a test state in which, depending on the light measurement, the current flowing in the light-emitting diodes can be interrupted. This interruption is preferably done by the circuit itself, for example by switching the arranged in series or parallel to the LEDs electronic switch.
• a measurement state in which, depending on the light measurement, the electronic switch for transmitting the value of the electrical signal to the main module is switched on and off.
• a communication state in which, depending on the light measurement, the electronic switch for transmitting the state of processing to the main module is turned on and off.

In the Hautptmodul for feeding light emitting diodes by means of a supply, this is also designed to power an electronic circuit according to one of the preceding claims by means of the supply. In this case, the main module is configured to detect a sequence of interruptions or short circuits of the supply, this sequence digitally encoding a feedback signal from the electronic circuit and decoding the feedback signal therefrom.

In a preferred embodiment of the invention, the main module for interrupting the supply in the form of a sequence of off and on of the supply is formed, this sequence digitally encodes a control signal for the electronic circuit.

In a method of operating an electronic circuit for the light measurement of light emitting diodes used in an emergency light, in the electronic circuit the powering of the light emitting diodes is intermittently interrupted (or, in another preferred embodiment of the invention, shorted) to transmit coded feedback signals to the main module , Conversely, the supply can be intermittently turned off by the main module to transmit control signals to the electronic circuit.

Further preferred embodiments emerge from the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

Figur 1

eine elektronische Schaltung gemäss der Erfindung;

Figur 2

eine Variante eines Teils der Schaltung;

Figur 3

einen zeitlichen Verlauf von Signalen zur Kommunikation mit der Schaltung; und

Figur 4

eine weitere Variante der Schaltung..

In the following, the subject invention will be explained in more detail with reference to preferred embodiments, which are illustrated in the accompanying drawings. Each show schematically:

FIG. 1

an electronic circuit according to the invention;

FIG. 2

a variant of a part of the circuit;

FIG. 3

a time course of signals for communication with the circuit; and

FIG. 4

another variant of the circuit ..

Basically, the same parts are provided with the same reference numerals in the figures.

WAYS FOR CARRYING OUT THE INVENTION

On the Fig.1 the invention is outlined. In an LED light there is a converter in a main module 1 and some built in an LED array light emitting diodes 3. The converter operates in a known manner either as a power source or as a voltage source. Since the current flowing in each LED must be limited to a maximum value, it is sometimes necessary to insert into each LED branch of the LED array 3 circuits that limit the current or divide the current. Such circuits can be active or passive (pure resistors).

On the one hand, the invention relates to the light sensor module 2, which is installed between the main module 1 and the light-emitting diodes 3, and, on the other hand, the main module 1, as well as the communication between the light sensor module 2 and the main module. This communication is done by turning on and off the voltage of the supply 14 in one direction or via the switching on and off of the transistor 5 as an electronic switch in the other direction.

Description of the Light Sensor Module 2:

The light sensor module 2 consists of the following components:

Light sensor 4: This light sensor is a conventional light sensor which can measure the light with a photodiode, a phototransistor or other component. With this light sensor, the luminous flux (or a part thereof) of the LEDs 3 is measured. This light sensor is either populated on the light sensor module or located in the LED array, where he with Wires connected to the light sensor module. When it is on or in the light sensor module, it is also possible to guide the light (or a part thereof) of the light-emitting diodes 3 to the light sensor with a light guide. The light sensor supplies an electrical signal 17, which simulates the measured luminous flux analog or digital, to the controller 6.

• Bearbeitung der Lichtmessung bzw. des Signals 17. Diese Lichtstärke-Messung wird zuerst eventuell verstärkt. In einer einfachen Ausführung wird diese mit einem Grenzwert verglichen. In einer weiteren Ausführung wird diese durch die Steuerung des Transistors 5 übertragen.
• Kalibrierung. Durch ein Eingangssignal 15 kann die aktuelle Lichtstärke-Messung gespeichert werden, um spätere Messungen mit diesem gespeicherten Wert zu vergleichen oder an Hand dieser Messung zu kalibrieren. Diese Kalibrierung wird zum Beispiel bei der Fertigung der LED-Leuchte gemacht, wenn die LEDs neu sind. Der Grenzwert kann dann z.B. als 50% oder 70% des bei der Kalibrierung gespeicherten Messwertes berechnet werden. Das Eingangssignal 15 kann über einen Prüftaster (mit einer Verbindung auf 0V und einem Pull-up Widerstand oder auf der Versorgungsspannung 16 des Kontrollers 6 bzw. einem Pull-down Widerstand) übermittelt werden. Es ist natürlich auch möglich, den Zeitpunkt der Kalibrierung über eine Infrarot- oder Funk-Schnittstelle zu definieren.
• Überwachung der LED-Spannung der Versorgung 14. Diese Überwachung erfolgt durch die Messung der Spannung, gegebenenfalls durch die Teilung über eine Widerstandsbrücke (Widerstände 7 und 8). Wenn das Hauptmodul 1 die Spannung der Versorgung 14 für eine kurze Zeit unterbricht, wird dieser Unterbruch vom Kontroller 6 registriert. Durch solche Unterbrüche, deren Dauer kurz genug ist, um von menschlichen Augen nicht bemerkt zu sein, können einfache Befehle vom Hauptmodul 1 an das Lichtsensormodul 2 übermittelt werden.
• Steuerung des in Serie zu den Leuchtdioden 3 geschalteten Transistors 5, um die Verbindung vom Hauptmodul 1 zu den Leuchtdioden 3 abzutrennen bzw. die LED-Leuchte abzuschalten, wie auf Fig. 1 abgebildet, oder Steuerung des parallel zu den Leuchtdioden 3 geschalteten Transistors 5, um diese Verbindung respektive Versorgung der Leuchtdioden 3 kurzzuschliessen, wie auf Fig. 4 abgebildet. In beiden Fällen wird also der in den Leuchtdioden 3 fliessende Strom durch Schalten des Transistors 5 unterbrochen. Wenn der Kontroller 6 den Transistor 5 in bestimmen Sequenzen aus- und einschaltet, ist dieser in der Lage, Meldungen oder Messwerte an das Hauptmodul zu übertragen. Solche Unterbrüche sind vorzugsweise, wie diejenige der Spannung der Versorgung 14, auch kurz genug, um von menschlichen Augen nicht wahrgenommen zu werden.

Controller 6: This controller 6 is a digital electronic controller, preferably built with a microcontroller. The following tasks are controlled by this microcontroller:

• Processing the light measurement or the signal 17. This light intensity measurement may first be amplified. In a simple implementation, this is compared to a limit value. In a further embodiment, this is transmitted by the control of the transistor 5.
• Calibration. By an input signal 15, the current light intensity measurement can be stored to compare later measurements with this stored value or to calibrate based on this measurement. This calibration is done, for example, during the manufacture of the LED light when the LEDs are new. The limit value can then be calculated, for example, as 50% or 70% of the measured value stored during the calibration. The input signal 15 can be transmitted via a test button (with a connection to 0V and a pull-up resistor or on the supply voltage 16 of the controller 6 or a pull-down resistor). Of course it is also possible to define the time of calibration via an infrared or wireless interface.
• Monitoring of the LED voltage of the supply 14. This monitoring takes place by measuring the voltage, if necessary by dividing by means of a resistance bridge (resistors 7 and 8). When the main module 1 cuts off the voltage of the supply 14 for a short time, this interruption is registered by the controller 6. Through such interruptions, whose Duration is short enough not to be noticed by human eyes, simple commands can be transmitted from the main module 1 to the light sensor module 2.
• Control of the transistor 5 connected in series with the light-emitting diodes 3 in order to disconnect the connection from the main module 1 to the light-emitting diodes 3 or to switch off the LED light, as on Fig. 1 imaged, or control of the parallel to the light-emitting diodes 3 connected transistor 5 to short-circuit this connection respectively supply the LEDs 3, as on Fig. 4 displayed. In both cases, therefore, the current flowing in the light-emitting diodes 3 is interrupted by switching the transistor 5. When the controller 6 turns the transistor 5 on and off in certain sequences, it is able to transmit messages or measured values to the main module. Such interruptions are preferably, like that of the voltage of the supply 14, also short enough not to be perceived by human eyes.

Transistor 5: This transistor 5 is preferably shown as a MOSFET transistor. Of course, bipolar or IGBT transistors may also be used instead of a MOSFET transistor. As in Fig. 1 can be switched on or off with this transistor, the LEDs 3, because the current, which is generated by the main module and flows through the light emitting diodes, flows through the transistor 5. Although a very simple direct control of the controller 6 can be realized, a preferred control on the Fig. 2 (as part of the circuit of Fig. 1 ). With this preferred variant of the control, the MOSFET transistor 5 is turned on via the pull-up resistor 21, as soon as a positive voltage of the supply 14 is applied. Thus, it is possible to avoid the time delay at start-up. Such a time delay arises when the controller 6 must first start to turn on the transistor 5. With this preferred control, the transistor 5 is controlled by the controller 6 via the additional transistor 22.

Depending on the voltage of the supply 14 vzw is provided to protect the gate of the transistor 5 with a Zener diode 23. If the line length of the connection to the LEDs 3 is too long, it may also be necessary to protect the transistor 5 with the freewheeling diode 24 of overvoltages.

As in Fig. 4 The light-emitting diodes 3 can also be switched on or off with the transistor 5 by this transistor 5 short-circuiting the supply 14 or deriving the LED current. With this variant of the control, the transistor 5 should be switched off when starting. For this, the pull-down resistor 50 can be used.

Supply of the controller 6:

When the LED array respectively the light emitting diodes 3 are powered by the main module, the current flows through the light sensor module into the light emitting diodes 3. Through the diode 10 and the resistor 13 (which can also be replaced by a current source or a short circuit when the voltage of the Supply 14 is too high or too small) then flows a current with which the capacitor 11 is charged and the controller 6 and the light intensity sensor 4 are supplied via the voltage regulator 9. The supply voltage 16 can also be regulated with a Zener diode instead of the voltage regulator 9. If necessary, the capacitor 12 may be provided as a smoothing capacitor for the controller 6. This capacitor is then also considered storage capacitor for the supply of the controller. 6

Preferably, with the capacitors 11 and 12 as memory capacitors, the supply voltage 16 will remain supported even if the voltage of the supply 14 for communication is set to zero for a short duration.

Description of the communication and the resulting states:

A possible communication is on the drawing Figure 3 displayed. The following description is based on the in Fig. 1 pictured circuit. The same communication is also with the in Fig. 4 shown circuit by the transistor 5 each instead switched off or switched off instead.

When starting (time t0), the light sensor module 2 is in a waiting state in which the light meter 17 is not processed, though it can be made. That is, the transistor 5 is turned on, for example, with the on Fig.2 shown control, and that the transistor 5 is always turned on, regardless of the light measurement 17. This wait state is the time T1 on the drawing Figure 3 designated.

When the light measurement 17 is judged, it is necessary to get the corresponding command from the main module 1. This command consists of a certain series of turning off and on the voltage of the supply 14, which are decoded as digital "0" and "1" bits, respectively, from the controller 6 via the resistors 7 and 8. Such a series of turning off and on takes place within a period of time T. The time period T, while the communication is taking place or the commands are sent from the main module 1 to the light sensor module 2, is preferably short enough so that the human eye does not perceive it, since the light emitting diodes 3 are switched off at each "0" or "0". to be switched every "1". The total capacitance of the capacitors 11 and 12 must be high enough to protect the supply voltage 16 of the controller 6 during the period T.

The state in which the light measurement 17 is evaluated is the so-called test state, and is the time T2 on the drawing Figure 3 designated. In this test state T2, the transistor 5 is turned off when the light measurement 17 is below a certain predetermined limit. Such a possibility is mapped, for example, at time t4, when the transistor 5 whose gate voltage is drawn is turned off.

When the transistor 5 is turned off, no current flows from the main module 1 into the LEDs 3. When the main module is constructed as a power source, the main module 1 can measure this current to register that the LEDs 3 are not supplying enough light. When the main module is constructed as a power source, the voltage of the supply 14 will increase when the transistor 5 is turned off. In this variant, the main module 1 can thus measure the voltage of the supply 14 in order to register that the light-emitting diodes 3 supply too little light.

The time at which the light sensor module 2 changes from the waiting to the test state, with the time delay T, at which the communication takes place and must be interpreted, after the starting point t1.

In an emergency, in which possibly the light intensity in emergency mode is smaller than that in the network operation, the emergency operation is always controlled for safety reasons by means of a corresponding control signal in the waiting state. That is, the emergency operation at the standby circuit starts as shown at time t0, and at time t2 at the duration circuit.

Preferably, there is another control signal in which the light sensor module 2 changes from the test state T2 to the waiting state T1. The return to the waiting state is drawn from time t2. In this command, the transistor 5 is turned on again and will remain so, regardless of the light measurement 17th

Another possibility is to transmit a kind of feedback to the main module with the switching off of the transistor 5, since the main module can measure the interruption as current as well as voltage source - as described above. With a certain sequence of off and on of the Transistor 5, the light sensor module also send signals or messages to the main module. With such messages, it is also possible to digitally transmit the measured value of the light measurement, and for example to leave the evaluation of the light measurement, for example by comparison with one or more limit values, to the main module.

In this preferred embodiment of the invention, the light sensor module 2, for example after receiving a corresponding control signal, in a so-called measurement state in which the value of the measurement is requested by the main module. For example, this process starts at time t3 on the drawing Figure 3 , The measurement state is shown as T3.

If the message requested by the main module relates only to the state of the light sensor module, the light sensor module 2 is in a so-called communication state, for example after receiving a corresponding control signal.

In so-called self-test emergency lights, a self-diagnosis is regularly carried out. The LEDs are controlled. In such luminaires, it is possible to control the light sensor module 2 with corresponding control signals in the test state T2 or in the measurement state T3, as is the example in the drawing Figure 3 is mapped at the times t1 and t3.

Claims (15)

Electronic circuit (2) for the light measurement of light-emitting diodes (3) used in an emergency light,
characterized in that the circuit (2) by a supply (14) of the light emitting diodes (3) is fed
and the following elements: A light sensor (4) which measures a part of the luminous flux of the light emitting diodes (3) and generates a corresponding electrical signal (17), An electronic controller (6) which processes and evaluates this electrical signal (17), Either an electronic switch (5) with which the supply (14) of the light-emitting diodes (3) can be interrupted, or an electronic switch with which the supply (14) of the light-emitting diodes (3) can be short-circuited, wherein the circuit (2) is adapted, in an evaluation of the electrical signal (17) according to a predetermined criterion by the electronic control (6) to control the electronic switch (5) and thereby the supply (14) of the light-emitting diodes (3) interrupt or short-circuit. Electronic circuit according to claim 1, wherein the electronic switch (5) is arranged in the circuit (2) such that it can interrupt the supply (14) of the light emitting diodes (3), preferably by connecting in series with the light emitting diodes (3) is. Electronic circuit (2) according to claim 2, wherein the electronic switch (5) is switched on by the supply (14) when the electronic control is switched on, preferably via a current source (21) connected to the supply (14). An electronic circuit (2) according to claim 1 or 2 or 3, wherein the electronic controller (6) is constructed as a digital controller. Electronic circuit (2) according to claim 4, wherein the circuit (2) is adapted, in the processing of the electrical signal (17) by the digital electronic controller (6) the electronic switch (5) in a specific sequence, which as a feedback signal digitally encode the value of the electrical signal (17) to turn the value of the electrical signal (17) off and on. Electronic circuit (2) according to claim 4 or 5, wherein the circuit (2) is adapted, in the processing of the electrical signal (17) by the digital electronic controller (6), the electronic switch (5) in a particular sequence as a feedback signal, digitally encode the state of processing to turn off and on to communicate the state of processing. Electronic circuit (2) according to one of the preceding claims, wherein the circuit (2) uses limit values in the evaluation of the electrical signal (17), and these limit values are generated by means of a calibration (15). Electronic circuit (2) according to one of claims 1 to 6, wherein the circuit (2) uses limit values in the evaluation of the electrical signal (17), and these limit values are already preprogrammed in the digital controller (6). Electronic circuit (2) according to one of Claims 4 to 8, the circuit receiving energy from the supply (14) by means of a memory circuit (10, 11) for a certain time (T) can store and use to supply the electronic control (6),
and the circuit (2) can detect the voltage of the supply (14),
and the circuit (2) is capable of receiving as a signal a sequence of on and off operations of the supply (14) and converting it into one of a plurality of control signals. Electronic circuit according to claim 9, wherein the circuit can be in a waiting state in which, regardless of the light measurement, the electronic switch (5) does not interrupt the current flowing in the light-emitting diodes (3), and the circuit (2) one of the plurality of control signals in the wait state can be switched. Electronic circuit (2) according to claim 9 or 10, wherein the circuit (2) can be in a test state in which the electronic switch (5) can interrupt the current flowing in the light-emitting diodes (3) as a function of the light measurement , and the circuit (2) with one of the plurality of control signals in the test state can be switched. Electronic circuit according to one of Claims 9 to 11, the circuit (2) being switched on and off in a measuring state in which, depending on the light measurement, the electronic switch (5) is switched on and off for the purpose of transmitting the value of the electrical signal (17) , and the circuit (2) can be switched to one of the plurality of control signals in the measurement state. An electronic circuit (2) according to any one of claims 9 to 12, wherein the circuit (2) is turned on and off in a communication state in which the electronic switch (5) is switched on and off depending on the light metering, can be, and the circuit (2) with one of the plurality of control signals in the communication state can be switched. Hautptmodul (1) for supplying light emitting diodes (3) by means of a supply (14),
characterized in that the main module (1) is also designed to supply an electronic circuit (2) according to one of the preceding claims by means of the supply (14), and the main module (1) is adapted to Detecting a sequence of interruptions or short circuits of the supply (14), said sequence digitally encoding a feedback signal of the electronic circuit (2), • and to decode the feedback signal. The skin module (1) according to claim 14, wherein the main module (14) is designed to interrupt the supply (14) in the form of a sequence of switching off and on of the supply (14), this sequence comprising a control signal for the electronic circuit (2). digitally coded.

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