WO2011123963A2 - Circuit électronique pour la mesure de lumière de diodes électroluminescentes utilisées dans une lumière d'urgence - Google Patents

Circuit électronique pour la mesure de lumière de diodes électroluminescentes utilisées dans une lumière d'urgence Download PDF

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Publication number
WO2011123963A2
WO2011123963A2 PCT/CH2011/000073 CH2011000073W WO2011123963A2 WO 2011123963 A2 WO2011123963 A2 WO 2011123963A2 CH 2011000073 W CH2011000073 W CH 2011000073W WO 2011123963 A2 WO2011123963 A2 WO 2011123963A2
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WO
WIPO (PCT)
Prior art keywords
circuit
light
electronic
supply
emitting diodes
Prior art date
Application number
PCT/CH2011/000073
Other languages
German (de)
English (en)
Other versions
WO2011123963A3 (fr
Inventor
Michel Noe
Pierre Schneider
Original Assignee
Polynom Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Polynom Ag filed Critical Polynom Ag
Publication of WO2011123963A2 publication Critical patent/WO2011123963A2/fr
Publication of WO2011123963A3 publication Critical patent/WO2011123963A3/fr

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/58—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving end of life detection of LEDs

Definitions

  • 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, each according to the preamble of the corresponding independent patent claims.
  • LEDs light-emitting diodes
  • LEDs are used more and more frequently.
  • 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.
  • a main module In a single-battery LED emergency light, there is a main module, with which all the necessary functions are performed.
  • standard light sensors photo diodes, photo transistors or special integrated circuits
  • the measurement is transmitted to the main module as a digital or analogue signal.
  • 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.
  • DE 10 2008 034 524 A1 describes a circuit in which a transistor is inserted in the light sensor circuit, so that if the light measurement is too low, the transistor can separate the LED from the main module. The main module can then detect the undershooting of a minimum illuminance by detecting this interruption.
  • a circuit is described in which a diagnostic circuit, which is located next to the LED or the LED arrangement, increases the current consumption in the event of a fault, so that the main module is informed of the faulty state by means of a current measurement.
  • 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 LEDs and generates a corresponding electrical signal
  • a memory circuit which stores energy from the supply for a certain time and supplies it to the power supply of the electronic control
  • circuit is adapted, in the processing of the electrical signal by the digital electronic control, the electronic switch in a specific sequence, which as Feedback signal digitally encoded the value of the electrical signal, for switching the value of the electrical signal off and on.
  • the circuit can store energy from the supply by means of a storage circuit for a certain time and use it to supply the electronic control, which circuit can detect the voltage of the supply, and the circuit is able to produce a sequence of on and off operations Receive supply as signals and convert it into one of several control signals.
  • the circuit preferably has a monitoring device with which the LED power supply is monitored in order to decode signals transmitted from a main module to the circuit.
  • the circuit is designed 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 light-emitting diodes respectively short-circuit.
  • a rating associates the signal with a particular state corresponding to the value of the signal.
  • the state expresses that the value is within a certain range between two limits.
  • 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 main supply module, so that a coded signal can be transmitted to the main module by means of a series of pulsed interruptions. It may thereby, in another embodiment of the invention, be responded to by the main module for a permanent interruption (for example, by an alarm or a display).
  • the electronic switch is arranged to short-circuit the supply (possibly also via a resistor of known size).
  • 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.
  • this light intensity is evaluated by the light sensor module. If this light intensity is too low, the LED feed is interrupted with the same module, preferably pulsed breaks, with a sequence of interrupts digitally encoding the state. With the main module controlling the emergency light in both mains and emergency mode , this line break or these pulsed interrupts will be registered and interpreted as the "low light level" state. With a preprogrammed strategy, a corresponding behavior is triggered via the main module, such as the activation of a local acoustic or optical signal or feedback regarding the too low light intensity to a control center (for example, wirelessly or via a bus line).
  • a control center for example, wirelessly or via a bus line.
  • this light intensity is only measured by the light sensor module and evaluated by the main module.
  • the measured value of the luminous intensity is transmitted by the light sensor module via the LED supply by pulsed interruptions to the main module, the sequence of interruptions digitally encoding this value.
  • the evaluation of this measurement or the triggering of a corresponding behavior is then carried out by 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.
  • the light sensor module can measure the light and transmit the measurement or its evaluation if necessary, or the light measurement in another operating state with a simple communication protocol in which the LED supply is switched on and off Do not perform or interrupt the LED cable. In this protocol, it is also possible to retrieve a transmission of a 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.
  • 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 and with which the light measurement and / or their evaluation to the main module transferable is.
  • the intelligent light sensor module must first be mounted next to the LEDs (so that the light can be measured).
  • the electronic switch 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.
  • 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.
  • a value for the brightness of the LEDs can be transmitted via the supply line.
  • the electronic circuit is designed, during the processing of the electrical signal by the digital electronic controller, to send out 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.
  • a state such as "first threshold for brightness undershot"'can be transmitted.
  • 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.
  • the limit values for example during production or commissioning, can be adapted to the light intensity of the LED arrangement used and / or to possible variances of the measuring device.
  • 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.
  • the circuit may be selectively switched to at least one of the following states with one of the plurality of control signals:
  • o a communication state in which thresholds to be used for the evaluation of the light measurement to be performed are transmitted to the circuit by pulsed breaks generated by the main module, o a communication state in which information from the circuit transmitted to the main module by pulsed interruptions generated by the circuit.
  • information may be, for example, stored light measurements made in the past, but also general information about the circuit itself, such as "software version", "production date” or "cumulative operating time", etc.
  • 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.
  • the supply of light emitting diodes in the electronic circuit 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.
  • FIG. 1 shows an electronic circuit according to the invention
  • FIG. 2 shows a variant of a part of the circuit
  • Figure 3 shows a time course of signals for communication with the
  • Figure 4 shows another variant of the circuit.
  • 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).
  • 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.
  • 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 it is connected with wires 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 provides an electrical signal 17, which simulates the measured luminous flux analog or digital, to the controller 6.
  • Controller 6 This controller 6 is a digital electronic controller with which the light sensor module 2 is controlled. This electronic control is preferably built with a microcontroller. The following tasks are controlled by this microcontroller:
  • 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.
  • 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 used, for example, in the manufacture of the LED
  • the threshold may then be e.g. be calculated as 50% or 70% of the reading stored during calibration.
  • the input signal 15 can 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
  • the current flowing in the light-emitting diodes 3 is interrupted by switching the transistor 5.
  • 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 can also be used instead of a MOSFET transistor. As shown in Fig. 1, the LEDs 3 can be turned on or off with this transistor, 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 can be realized by the controller 6, a preferred controller is shown in 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.
  • the transistor 5 is controlled by the controller 6 via the additional transistor 22.
  • 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.
  • the light emitting diodes 3 can also be turned on or off with the transistor 5 by this transistor 5 short-circuits the supply 14 and the LED current dissipates.
  • the transistor 5 should be switched off when starting.
  • the pull-down resistor 50 can be used.
  • the current flows through the light sensor module into the light emitting diodes 3.
  • the diode 10 and the resistor 13 (which can also be replaced by a current source or a short circuit, if the voltage of the Supply 14 is too high or too small) then flows a current with which the capacitor 1 1 is loaded 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.
  • the capacitor 12 may be provided as a smoothing capacitor for the controller 6. This capacitor is then considered as a storage capacitor for the supply of the controller 6.
  • the supply voltage 16 will remain supported supported, even if the voltage of the supply 14 for communication during a short period to zero is set.
  • the light sensor module 2 is in a waiting state in which the light meter 17 is not processed although it can be made. That is, the transistor 5 is turned on, for example, with the control shown in Fig. 2, and that the transistor 5 is always kept on, regardless of the light measurement 17.
  • This wait state is indicated by the time Tl in the drawing Fig.3 ,
  • 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 time period T.
  • the state in which the light measurement 17 is evaluated is the so-called test state, and is denoted by the time T2 in the drawing Fig.3.
  • the transistor 5 is turned off when the light measurement 17 is below a certain predetermined limit.
  • time t4 Such a possibility is exemplified at time t4, when the transistor 5 whose gate voltage is drawn is turned off.
  • the main module 1 can measure this current to register that the LEDs 3 provide little light.
  • the main module 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 tl.
  • 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 in the standby circuit as drawn at time tO starts or at time t2 in the permanent circuit.
  • the emergency operation in the standby circuit as drawn at time tO starts or at time t2 in the permanent circuit.
  • 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.
  • the transistor 5 is turned on again and will remain so, regardless of the light measurement 17.
  • Another possibility is to transmit with the shutdown of the transistor 5, a kind of feedback to the main module, since the main module as a current as well as a voltage source can measure the interruption - as described above.
  • the light sensor module can also send signals or messages to the main module. With such messages it is also possible to measure the measured Digitally transmitting the value of the light measurement, and for example, leaving the evaluation of the light measurement, for example by comparison with one or more limit values, to the main module.
  • 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. This process starts, for example, at time t3 on the drawing Fig.3. The measurement state is shown as T3.
  • the light sensor module 2 is in a so-called communication state, for example after receiving a corresponding control signal.
  • the light sensor module 2 When data such as calibration values are transmitted from the main module to the light sensor module, the light sensor module 2 is in a so-called communication reception state, for example after receiving a corresponding control signal.

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

Abstract

Dans un circuit électronique (2) pour la mesure de lumière de diodes électroluminescentes (3) utilisées dans une lumière d'urgence, le circuit (2) est alimenté par une alimentation (14) des diodes électroluminescentes (3) et comporte : • un capteur de lumière (4) servant à produire un signal électrique (17) en fonction d'un courant de lumière des diodes électroluminescentes, • une commande électronique (6) pour le traitement de ce signal (17), • un commutateur électronique (5) servant à interrompre ou à court-circuiter l'alimentation (14) des diodes électroluminescentes (3). La commande électronique (6) est ainsi conçue comme une commande numérique et comporte : • un circuit accumulateur (10, 11) pour l'alimentation de la commande électronique (6), • le circuit (2) ouvrant et fermant le commutateur électronique (5) lors du traitement du signal électrique (17) dans un certain ordre qui code numériquement la valeur du signal électrique (17) en tant que signal de retour, pour la transmission de la valeur du signal électrique (17).
PCT/CH2011/000073 2010-04-07 2011-04-06 Circuit électronique pour la mesure de lumière de diodes électroluminescentes utilisées dans une lumière d'urgence WO2011123963A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP10405076 2010-04-07
EP10405076A EP2375858A1 (fr) 2010-04-07 2010-04-07 Circuit électronique pour la mesure de la luminosité de diodes luminescentes utilisées dans une lampe de secours

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WO2011123963A2 true WO2011123963A2 (fr) 2011-10-13
WO2011123963A3 WO2011123963A3 (fr) 2012-06-21

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EP (1) EP2375858A1 (fr)
WO (1) WO2011123963A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110024259A (zh) * 2016-11-30 2019-07-16 赤多尼科两合股份有限公司 具有测试开关和状态指示器的操作装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013090704A1 (fr) * 2011-12-15 2013-06-20 Terralux, Inc. Systèmes et procédés pour communication de données d'un dispositif de diodes électroluminescentes au système d'attaque, par modulation de charge
AT14580U1 (de) * 2013-01-31 2016-01-15 Tridonic Gmbh & Co Kg Vorrichtung zum Betreiben von LEDs
AT14579U1 (de) * 2013-01-31 2016-01-15 Tridonic Gmbh & Co Kg Vorrichtung zum LED Betrieb

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1000806A2 (fr) 1998-11-13 2000-05-17 Hella KG Hueck & Co. Procédé de diagnostic pour des feux à LEDs dans un véhicule
DE102008034524A1 (de) 2008-07-24 2010-01-28 Tridonicatco Gmbh & Co. Kg Notlichteinheit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1845755A3 (fr) * 2006-04-10 2014-04-02 EMD Technologies, Inc. Systèmes d'illumination

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1000806A2 (fr) 1998-11-13 2000-05-17 Hella KG Hueck & Co. Procédé de diagnostic pour des feux à LEDs dans un véhicule
DE102008034524A1 (de) 2008-07-24 2010-01-28 Tridonicatco Gmbh & Co. Kg Notlichteinheit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110024259A (zh) * 2016-11-30 2019-07-16 赤多尼科两合股份有限公司 具有测试开关和状态指示器的操作装置
CN110024259B (zh) * 2016-11-30 2023-07-11 赤多尼科两合股份有限公司 具有测试开关和状态指示器的操作装置

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WO2011123963A3 (fr) 2012-06-21
EP2375858A1 (fr) 2011-10-12

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