EP2104400A1 - Détection de l'intensité lumineuse dans des inverseurs à électroluminescence - Google Patents

Détection de l'intensité lumineuse dans des inverseurs à électroluminescence Download PDF

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Publication number
EP2104400A1
EP2104400A1 EP08450038A EP08450038A EP2104400A1 EP 2104400 A1 EP2104400 A1 EP 2104400A1 EP 08450038 A EP08450038 A EP 08450038A EP 08450038 A EP08450038 A EP 08450038A EP 2104400 A1 EP2104400 A1 EP 2104400A1
Authority
EP
European Patent Office
Prior art keywords
converter
signal
luminous
capacitor
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08450038A
Other languages
German (de)
English (en)
Inventor
Alexander Mair
Karlheinz Bauer
Hans Dr. Ertl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lunatone Industrielle Elektronik GmbH
Original Assignee
Lunatone Industrielle Elektronik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lunatone Industrielle Elektronik GmbH filed Critical Lunatone Industrielle Elektronik GmbH
Priority to EP08450038A priority Critical patent/EP2104400A1/fr
Publication of EP2104400A1 publication Critical patent/EP2104400A1/fr
Withdrawn legal-status Critical Current

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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
    • H05B44/00—Circuit arrangements for operating electroluminescent light sources

Definitions

  • the invention relates to a device or a method for detecting the luminous intensity of light sources based on electroluminescent light-emitting capacitors as indicated in the preamble of patent claim 1.
  • electroluminescent effect allows the realization of lighting devices with very great design freedom and universal applicability.
  • films are used as light sources, to which special materials (luminescent pigments) and corresponding connection electrodes are applied by means of a screen printing process.
  • the "light capacitor" thus formed is supplied with a defined alternating voltage (for example typ. 100 VAC, 400 Hz), the foil begins to emit light.
  • a defined alternating voltage for example typ. 100 VAC, 400 Hz
  • the foil begins to emit light.
  • the generation of this alternating voltage is done with a power electronic converter comparable to modern fluorescent tubes.
  • electroluminescent light capacitors have pronounced aging effects, i. During their lifetime, the luminous intensity decreases significantly at constant supply voltage. This is a major reason why such light sources are so far mostly found only in the entertainment / event area, where the light intensity is usually adjusted manually to the current requirements. In applications in the field of safety technology (such as for the escape route marking) or in automotive applications, manual intervention is usually not permitted. Rather, it is required here that the lighting system automatically guarantees a defined, constant light intensity over the entire service life.
  • the aging state of the luminescent capacitor film is also dependent on many other parameters apart from the operating time (eg also substantially on ambient temperature and humidity), a simple time-dependent specification of power, current or voltage to achieve a constant light intensity therefore works only very inadequate. There is also the risk that the actual aging is lower than corresponds to the voltage boost. The light source is then overdriven, thereby further accelerating the aging process and possibly not achieving the required overall service life.
  • the WO 2006/037363 A1 shows a method based on the evaluation of the diode flux voltage. The measurement of this voltage is carried out in a setting mode using a defined measuring current. Furthermore, in the US 5,859,658 describes a method for the aging compensation of an LED line of an LED printer, in which the differential slope of the transmission characteristic of the LEDs for the indirect determination of the light intensity is evaluated. Both methods can not be applied to electroluminescent light capacitors in the form described in each case because the DC components occurring in the operating or setting mode are inadmissible because they cause a serious, for practical applications unacceptable reduction in the life of the luminous film.
  • the change in the LED / OLED current amplitude in the setting / measuring mode is associated with a corresponding fluctuation of the light intensity. This is not a disadvantage for the application in an LED printer (light adjustment between about two pages, for example), in an application as a continuous lighting but this leads to an unwanted flicker.
  • the object of the invention is therefore to provide a method and a device with which / which the light intensity of an electroluminescent light-emitting capacitor can be determined during normal continuous operation, without a special light sensor is needed.
  • This object is achieved with a method of the type mentioned in the present invention that the output voltage of the converter in addition to the operating AC voltage test signals are superimposed, the current signal and / or the voltage signal of the converter measured and the measurement results of an arithmetic circuit be fed, and the arithmetic circuit determines it from the luminous capacitor equivalent circuit parameters and determined by evaluating the luminous capacitor equivalent circuit parameters, the current luminous intensity of the luminous capacitor as a luminous intensity signal.
  • the method according to the invention it is possible to determine the light intensity of a luminous means without having to provide an external light sensor.
  • the test signals superimposed on the operating AC voltage of the converter have the form of voltage signals or changed output impedances.
  • the luminous capacitor equivalent circuit diagram parameters in the arithmetic circuit.
  • the luminous intensity of the luminous means is determined therefrom, for example with the aid of offline measurement results stored in the arithmetic circuit in the form of tables.
  • the measurement of the current signal and / or the voltage signal at the converter takes place either on the output side, ie between the converter and the lighting means, or both on the output side and on the input side, the input side being understood to be located between the converter and the energy source.
  • the arithmetic circuit is supplied with information signals of the ambient temperature and / or humidity. Since these variables strongly influence the luminous intensity of light sources such as electroluminescent light-emitting capacitors, the current luminous intensity of the light-emitting means can be determined even more precisely by taking them into account.
  • test signals superimposed on the output voltage of the converter desirably have equal-rate stochastic or periodic test signal components. Since light sources such as electroluminescent light-emitting capacitors can be destroyed by DC components, such a DC-free design of the test signals is advantageous.
  • the use of stochastic signals results in lower light disturbances and the measurement does not have to be synchronized with the useful frequency. For periodic signals, however, there must be a synchronization to the useful frequency in order to avoid beats.
  • an external desired value signal is predetermined for controlling the luminous intensity of the electroluminescent luminous capacitor, by means of which the luminous intensity signal is regulated via the output voltage of the converter. That's it possible, in addition to determining the current luminous intensity to ensure a constant value of the luminous intensity of the bulb.
  • By changing the external setpoint signal it is possible to dim the illuminant by means of the method according to the invention, ie to increase or decrease the luminous intensity of the luminous means.
  • the luminous intensity signal can be supplied to a comparator which outputs a binary signal which signals the end of the life cycle of the luminous means when the luminous intensity signal falls below a certain, predetermined threshold. This makes it possible in a simple manner, to determine the right time to replace the bulb.
  • the object of the invention is further achieved with a device of the type mentioned, which comprises at least one electrical energy source, at least one power electronic converter, at least one light source and at least one arithmetic circuit.
  • the lighting means is an electroluminescent light-emitting capacitor.
  • a comparator circuit is provided.
  • the luminous intensity signal which is determined in the arithmetic circuit, can then be supplied to this comparator circuit. If the luminous intensity signal falls below a certain threshold, a signal is generated which indicates the end of the life of the luminous means.
  • At least one sensor may be provided for measuring the ambient temperature and / or humidity.
  • Fig. 1 a schematic representation of the device according to the invention for determining the current luminous intensity of electroluminescent light-emitting capacitors by evaluation of current / voltage measurements and
  • FIGS. 2a and 2b two examples of output voltage signals of the converter with impressed test signals.
  • a light-emitting means for example, an electroluminescent light-emitting capacitor (The illuminant and the electroluminescent light-emitting capacitor equivalent to the reference numeral 1 are provided for ease of reading in the text below), powered by a power electronic converter 2 from an electrical energy source 3, wherein the output voltage of the converter 2 are superimposed specific test signals, which the determination allow the characteristic electrical characteristics of the bulb 1.
  • the test signals have the form of defined variations of the output voltage or output impedance of the converter 2.
  • the reaction of the light source to the test signals is detected by current / voltage measurement, which can be done on the input side and / or output side.
  • the measurement is carried out on the output side or on the output side and on the input side of the converter 2.
  • “Input side” here refers to the region between the converter 2 and the power source 3
  • “output side” denotes the region between the converter 2 and a consumer, in this case the lighting means. 1
  • the current / voltage signals (5/6 or 9/10) are supplied to a calculation circuit 7 which determines the characteristic electrical parameters of the luminous means 1; These parameters are, for example, the capacitance, the loss angle tan ⁇ or the impedance curve. From these parameters, it is possible to deduce the instantaneous state of aging of the luminous means and the intensity of the light generated by comparing the values with values stored in tables.
  • the arithmetic circuit 7 generates from the electrical parameters of the luminous means 1 a light intensity signal 8 which corresponds to the actual light intensity with good accuracy.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP08450038A 2008-03-19 2008-03-19 Détection de l'intensité lumineuse dans des inverseurs à électroluminescence Withdrawn EP2104400A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08450038A EP2104400A1 (fr) 2008-03-19 2008-03-19 Détection de l'intensité lumineuse dans des inverseurs à électroluminescence

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08450038A EP2104400A1 (fr) 2008-03-19 2008-03-19 Détection de l'intensité lumineuse dans des inverseurs à électroluminescence

Publications (1)

Publication Number Publication Date
EP2104400A1 true EP2104400A1 (fr) 2009-09-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08450038A Withdrawn EP2104400A1 (fr) 2008-03-19 2008-03-19 Détection de l'intensité lumineuse dans des inverseurs à électroluminescence

Country Status (1)

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EP (1) EP2104400A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005116964A1 (fr) * 2004-05-28 2005-12-08 Pelikon Limited Commande d'afficheurs electroluminescents
WO2006063937A1 (fr) * 2004-12-14 2006-06-22 Schreiner Group Gmbh & Co. Kg Capteur de luminosite

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005116964A1 (fr) * 2004-05-28 2005-12-08 Pelikon Limited Commande d'afficheurs electroluminescents
WO2006063937A1 (fr) * 2004-12-14 2006-06-22 Schreiner Group Gmbh & Co. Kg Capteur de luminosite

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