EP2247161A1 - Reconnaissance d'une panne pour moyen d'éclairage dans des lampes de véhicules automobiles - Google Patents

Reconnaissance d'une panne pour moyen d'éclairage dans des lampes de véhicules automobiles Download PDF

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Publication number
EP2247161A1
EP2247161A1 EP09005873A EP09005873A EP2247161A1 EP 2247161 A1 EP2247161 A1 EP 2247161A1 EP 09005873 A EP09005873 A EP 09005873A EP 09005873 A EP09005873 A EP 09005873A EP 2247161 A1 EP2247161 A1 EP 2247161A1
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EP
European Patent Office
Prior art keywords
failure detection
branches
detected
failure
branch
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.)
Granted
Application number
EP09005873A
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German (de)
English (en)
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EP2247161B1 (fr
Inventor
Attila Gönczi
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Odelo GmbH
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Odelo GmbH
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Priority to EP09005873.6A priority Critical patent/EP2247161B1/fr
Priority to SI200930933T priority patent/SI2247161T1/sl
Publication of EP2247161A1 publication Critical patent/EP2247161A1/fr
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Publication of EP2247161B1 publication Critical patent/EP2247161B1/fr
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    • 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
    • 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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • 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
    • H05B45/52—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a parallel array of LEDs
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/21—Responsive to malfunctions or to light source life; for protection of two or more light sources connected in parallel

Definitions

  • the invention relates to a failure detection according to the preamble of claim 1.
  • motor vehicle lights such as taillights, lights, daytime running lights, interior lights, etc.
  • the individual lighting functions such as tail light, brake light, headlight, Wiederholblinklicht, headlights, daytime running lights, reversing lights, etc., depending on the required brightness or light intensity and / or Light distribution each different light sources, such as incandescent lamps, gas discharge lamps, light-emitting diodes (LEDs) and / or each used a different number of light sources as a light source.
  • LEDs light-emitting diodes
  • LEDs typically have an operating voltage of 1 to 3 V, which is why it is common for better utilization of the prevailing voltage in the electrical system of motor vehicles to switch several, eg three or four LEDs to a so-called LED string in series or in series. Depending on the number of LEDs required to produce a specific light intensity, a plurality of such LED strings are connected in parallel.
  • a common power supply parallel-connected LED strands branches to the following LED branches mentioned individual LED strands.
  • An illustrative example is a taillight, in which a total of 15 LEDs divided into five LED branches connected in parallel to three LEDs in series for the backlight function are used.
  • the problem with the use of multiple so interconnected to a field LEDs or general lighting as a light source is the failure of individual bulbs or a required failure detection. If a light source falls e.g. high impedance from, corresponding to a burn, flows through the associated bulb branch no more power, causing the remaining bulbs remain dark in the entire associated bulb branch or go out and reduce the luminosity of the light function. If a light source falls e.g. low impedance, corresponding to a short circuit, is applied to the remaining bulbs in the associated light source branch to a higher voltage than the operating voltage. As a result, a higher current than the operating voltage of the remaining bulbs initially flow.
  • the remaining light sources can initially shine brighter, so that the low-impedance failure of a light source can initially remain hidden.
  • the higher current leads sooner or later usually to a destruction of at least one of the remaining bulbs in the associated light source branch, whereby the luminosity of the light function is reduced even in the case of a low-impedance failure within the foreseeable future.
  • the electrical loads are connected in parallel and have separate power supply lines. Each electrical load is associated with a current sensor, which has a different resistance value when current flows through the monitored power supply, as in the de-energized state of the monitored power supply.
  • the current sensors have different resistance values at current flow in the monitored power supply lines.
  • the current sensors are connected in parallel to a voltage divider circuit, so that an evaluation different Voltages depending on the current flows through the individual power supplies results. The measurement is carried out indirectly via arranged in the power supply coils and coils in the magnetic fields of the current-carrying coils arranged reed contacts as current sensors.
  • the DE 101 31 824 A1 is a failure detection of LEDs in a motor vehicle known.
  • an electrical potential in an LED branch is detected from one or more LEDs connected in series.
  • a reference potential dependent on the voltage of the electrical system is detected.
  • the electrical potential in the LED branch is compared with the reference potential. As a result, vehicle electrical system fluctuations are compensated.
  • a failure detection signal is output when at least one LED in the LED branch fails.
  • An object of the invention is to develop a failure detection for lamps in motor vehicle lights with several parallel branches consisting of one or more series-connected bulbs, which is simple and inexpensive to produce.
  • a failure detection for lamps in automotive lights with multiple parallel branches consisting of one or more in series switched Leuchtmittein provides that a first electrical potential in a first branch of one or more series-connected Leuchtmittein is detected and compared with a second branch in a second branch with a structure identical to the second detected second electrical potential, wherein in a deviation of Potentials of two branches by a predetermined amount a failure detected or inferred from a failure.
  • the comparison also compensates for board network fluctuations. If the comparison, preferably minus a tolerance, yields e.g. the operating voltage of a lamp corresponding difference, it is inferred on a failure at least in one of the two compared branches. For example, then the power supply of the affected lighting function, e.g. be switched off.
  • the comparison also allows the detection of positive and negative deviations and thus allows detection of both a high-impedance failure or burn-through and a low-impedance failure or short circuit.
  • An advantageous embodiment of the invention provides that the detection of the potentials in the individual branches from branch to branch takes place sequentially and preferably cyclically. As a result, the cabling effort or Verschaltungsaufwand for failure detection or a circuit arrangement of a failure detection is further reduced.
  • a multiplexer can be used, for example, successively switches the individual branches to an input or successively reads the respective potentials.
  • predetermined or predetermined voltage drop of individual light source may advantageously be predefined or predetermined, for example, by calculation, with which the detected potentials or potential actual values of the branches can be compared. As a result, a clear detection of a burnout and a short circuit is possible. If, for example, the potential or the actual potential value of a first branch corresponds substantially, eg less a tolerance, to a calculated potential setpoint and if the potential of a second branch is higher, for example, with respect to ground, then a short circuit can be deduced. If the potential is lower compared to ground, for example, a burn-through can be deduced. It is important to emphasize that the conditions can be reversed, depending on where in the branch the potential is tapped.
  • a dependent of the voltage of a vehicle electrical system reference potential is also detected.
  • the reliability of a detection of burn-through and a short circuit can be further increased.
  • the comparison is carried out with knowledge of the voltage drop of the monitored bulbs and the vehicle electrical system voltage.
  • the reference potential can be detected permanently or as the potential of a branch.
  • a particularly advantageous embodiment of the invention provides that when detected failure, the power supply to all branches is interrupted. This deactivates the affected lighting function.
  • Another advantageous embodiment of the invention provides that when detected failure of the affected branch is disconnected from the power supply. As a result, the affected lighting function is maintained, for example, with reduced brightness or brightness, without the risk of failure by z.
  • the failure detection provides advantageous that a failure detection signal is output when detected failure.
  • the failure detection signal can be used, for example, via a bus in a motor vehicle to prevent the failure, e.g. signal in a display in the dashboard, or the failure in a control unit for later query, for. as part of an inspection.
  • LEDs light-emitting diodes
  • LEDs have a defined operating voltage or a defined voltage drop at operating voltage, which in a particularly advantageous manner when comparing the potentials in their structure identical parallel LED branches from one or more series-connected LEDs for failure detection and in particular for detecting what for a kind of failure, burnout or short circuit, it is, can be used.
  • the parallel branches can be fed by a common power supply. As a result, the wiring effort is significantly reduced again and the production costs can be further reduced.
  • a failure detection according to the invention for example, by an in Fig. 1 illustrated circuit arrangement 01 realized.
  • the circuit arrangement 01 is used for failure detection of several as a light source for a lighting function, eg the tail light, a motor vehicle light not shown, designed as LEDs 02 bulbs.
  • three LEDs 02 are connected in series to identical LED branches 03.
  • the LED branches 03 are connected in parallel and, for example, connected via a common power supply 04 to a power source 05.
  • the power source 05 can be representative of an electrical system of a motor vehicle.
  • a current setting 06 may be arranged, for example in the form of, for example, an adjustable ohmic resistance or a current generator.
  • the current setting 06 can regulate the electric current through the respective LED branch 03, for example by limiting the electric current.
  • the circuit 01 also has a control electronics 07.
  • the control electronics 07 is also connected to its power supply via a power supply 08 to the power source 05.
  • An input 09 of the control electronics 07 is connected via a connecting line 10 with the LED branches 03.
  • switches 11 are respectively arranged between the connecting line 10 and the individual LED branches 03. The switches 11 can be switched through control lines 12 of the control electronics 07 individually one after the other, whereby at the input 09 in each case an electrical potential of an LED branch 03 is detected.
  • a signal conditioning 13 is arranged, for example in the form of an amplifier. Due to the fact that the connecting line 10 is connected in succession to the LED branches for detecting their electrical potentials, the circuit arrangement requires only a single signal conditioning 13.
  • control electronics 07 comprises a multiplexer, for example, takes over the function of the switch 11 and produces the connections of the connecting line 10 with the LED branches 03 cyclically successively.
  • control electronics 07 comprises a multiplexer, for example, takes over the function of the switch 11 and produces the connections of the connecting line 10 with the LED branches 03 cyclically successively.
  • directly waiving the connecting line 10 the inputs of a multiplexer directly to the LED branches 03 are connected.
  • the input 09. the control electronics 07 is connected in chronological succession, each with an LED branch 03.
  • a first electrical potential is detected, for example read in, which can then be compared with a second electrical potential detected in a second LED branch 03 with a structure identical to the first LED branch 03. If the comparison results in a deviation of the potentials of two LED branches 03 by a predetermined amount, a failure of one or more LEDs 02 in one of the two LED branches 03 can be deduced.
  • a potential setpoint value of the LED branches 03 can be predetermined, for example by calculation. With the potential setpoint value, the potential actual values of corresponding detected potentials of the LED branches 03 can be compared. As a result, a clear detection of burn-through and a short circuit and a clear assignment of the detected failure to an LED branch 03 is possible. If, for example, the potential detected in a first LED branch 03 preferably corresponds, less a tolerance, to a calculated potential setpoint, and if the potential of a second LED branch 03 is higher, then a short circuit can be deduced. If the potential is lower, a burn-through can be deduced. It is important to emphasize that the conditions are the other way round can, depending on where in an LED branch 03, the potential is tapped.
  • the control electronics 07 may also have knowledge of the current supply voltage of the power source 05 representative of a voltage of a vehicle electrical system of a motor vehicle. This supply voltage or a directly dependent on the supply voltage comparison voltage can be used as a reference potential for a further comparison, for example, with knowledge of the voltage drop of the monitored LEDs 02 and the supply voltage. As a result, burn through and short circuit can be detected with higher reliability.
  • common power supply 04 may be arranged connected to the control electronics 07 via a control line 14 means 15, with the common power supply 04 is interrupted in a detected failure. This deactivates the affected lighting function.
  • the control electronics 07 may output a failure detection signal, which may be used, for example, to prevent the failure, e.g. in a display in or on a dashboard of a motor vehicle, or the failure in a control unit of a motor vehicle for later querying e.g. as part of an inspection.
  • the current setting 06 can simultaneously serve as a measurement or reference resistance at which the potential of an LED branch 03 is tapped. At a constant supply voltage, a constant voltage drop is to be expected at the measuring resistor.
  • the control electronics 07 examines all LED branches 03, if the measured potential is outside a defined interval. When an LED 02 fails, the potential measured in the affected LED branch changes.
  • control electronics in principle is also able to compare the potential of an LED branch 03 with a measured at an earlier time potential of the same LED branch.
  • the second LED branch at which a second potential is tapped, would correspond to the first LED branch at a later time.
  • the invention solves the problem of failure detection both at break and short circuit of bulbs, such as LEDs 02, which are often connected in series for illumination purposes. Especially a short circuit detection was previously extremely expensive possible according to the prior art.
  • the invention is applicable to all LED types without limitation to the number of LEDs used.
  • the circuit 01 is robust and reliable. By using a control electronics 07, it is possible with little effort, the inventive failure detection in LED dimmer and various communication devices in a motor vehicle, such. in a synchronous field bus (LIN, Local Inteconnect Network) or in an asynchronous fieldbus (CAN, Controller Area Network) to integrate or to realize the invention in such an environment.
  • LIN synchronous field bus
  • CAN Controller Area Network
  • the invention is particularly industrially applicable in the field of production of motor vehicle lights.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
EP09005873.6A 2009-04-28 2009-04-28 Reconnaissance d'une panne pour moyen d'éclairage dans des lampes de véhicules automobiles Active EP2247161B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP09005873.6A EP2247161B1 (fr) 2009-04-28 2009-04-28 Reconnaissance d'une panne pour moyen d'éclairage dans des lampes de véhicules automobiles
SI200930933T SI2247161T1 (sl) 2009-04-28 2009-04-28 Zaznava napak svetilnih naprav v svetilih motornih vozil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09005873.6A EP2247161B1 (fr) 2009-04-28 2009-04-28 Reconnaissance d'une panne pour moyen d'éclairage dans des lampes de véhicules automobiles

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EP2247161A1 true EP2247161A1 (fr) 2010-11-03
EP2247161B1 EP2247161B1 (fr) 2014-05-14

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2487999A1 (fr) * 2011-02-09 2012-08-15 National Semiconductor Corporation Technique pour identifier au moins une diode électroluminescente défectueuse dans plusieurs séries de diodes électroluminescentes
WO2012077013A3 (fr) * 2010-12-08 2012-08-23 Koninklijke Philips Electronics N.V. Circuit de commande pour des lampes à del dans des applications automobiles
WO2012175288A1 (fr) * 2011-06-24 2012-12-27 Ams Ag Circuit d'attaque et procédé de détection d'un état défectueux d'une unité d'éclairage
DE102011087658A1 (de) * 2011-12-02 2013-06-06 Osram Gmbh Parallel geschaltete Leuchtketten
US20130304304A1 (en) * 2010-10-26 2013-11-14 Automotive Lighting Reutlingen Gmbh Combination of an on-board power supply control device and at least one light control device of a motor vehicle
WO2013181853A1 (fr) * 2012-06-05 2013-12-12 深圳市华星光电技术有限公司 Système de rétro-éclairage del et dispositif d'affichage
EP2779795A1 (fr) * 2013-03-14 2014-09-17 Grote Industries, Inc. Circuit de détection d'une panne d'éclairage de véhicule
EP2783915A1 (fr) 2013-03-26 2014-10-01 Odelo GmbH Procédé de génération d'un signal de diagnostic d'une lampe de véhicule automobile dotée de plusieurs moyens d'éclairage et lampe de véhicule automobile
EP2979954A2 (fr) 2014-07-29 2016-02-03 PINTSCH BAMAG Antriebs- und Verkehrstechnik GmbH Unité del pour émetteur de signaux lumineux, émetteur de signaux lumineux ayant une telle unité et procédé de surveillance d'une chaine de del d'une unité del
DE102014216085A1 (de) 2014-08-13 2016-02-18 Automotive Lighting Reutlingen Gmbh Überwachungseinheit für ein eine Halbleiterlichtquelle umfassendes Lichtmodul für eine Beleuchtungseinrichtung eines Kraftfahrzeugs
FR3068562A1 (fr) * 2017-06-30 2019-01-04 Vignal Systems Procede et dispositif de controle-commande pour gyrophare

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4035673A1 (de) 1990-11-09 1992-05-14 Audi Ag Ausfallerkennung fuer mindestens zwei elektrische verbraucher
DE19929165A1 (de) * 1998-07-16 2000-01-20 Hitachi Cable Lichtemittierendes Diodenarray
DE10131824A1 (de) 2001-06-30 2003-02-20 Hella Kg Hueck & Co Schaltungseinrichtung für die Ausfallerkennung von Leuchtdioden in einem Kraftfahrzeug
EP1286571A2 (fr) * 2001-05-02 2003-02-26 Garufo GmbH Alimentation avec protection électronique pour un circuit et dispositif d'affichage des informations variables
DE10215486C1 (de) * 2002-04-09 2003-10-30 Hella Kg Hueck & Co Beleuchtungseinrichtung für Fahrzeuge
DE102005046583A1 (de) * 2005-09-28 2007-03-29 Eppendorf Ag Laborvorrichtung zur gleichzeitigen Durchführung von Reaktionen in einer Mehrzahl von Proben

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4035673A1 (de) 1990-11-09 1992-05-14 Audi Ag Ausfallerkennung fuer mindestens zwei elektrische verbraucher
DE19929165A1 (de) * 1998-07-16 2000-01-20 Hitachi Cable Lichtemittierendes Diodenarray
EP1286571A2 (fr) * 2001-05-02 2003-02-26 Garufo GmbH Alimentation avec protection électronique pour un circuit et dispositif d'affichage des informations variables
DE10131824A1 (de) 2001-06-30 2003-02-20 Hella Kg Hueck & Co Schaltungseinrichtung für die Ausfallerkennung von Leuchtdioden in einem Kraftfahrzeug
DE10215486C1 (de) * 2002-04-09 2003-10-30 Hella Kg Hueck & Co Beleuchtungseinrichtung für Fahrzeuge
DE102005046583A1 (de) * 2005-09-28 2007-03-29 Eppendorf Ag Laborvorrichtung zur gleichzeitigen Durchführung von Reaktionen in einer Mehrzahl von Proben

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9308821B2 (en) * 2010-10-26 2016-04-12 Automotive Lighting Reutlingen Gmbh Internal power supply control device having at least one lighting control device for a motor vehicle
US20130304304A1 (en) * 2010-10-26 2013-11-14 Automotive Lighting Reutlingen Gmbh Combination of an on-board power supply control device and at least one light control device of a motor vehicle
WO2012077013A3 (fr) * 2010-12-08 2012-08-23 Koninklijke Philips Electronics N.V. Circuit de commande pour des lampes à del dans des applications automobiles
EP2487999A1 (fr) * 2011-02-09 2012-08-15 National Semiconductor Corporation Technique pour identifier au moins une diode électroluminescente défectueuse dans plusieurs séries de diodes électroluminescentes
WO2012175288A1 (fr) * 2011-06-24 2012-12-27 Ams Ag Circuit d'attaque et procédé de détection d'un état défectueux d'une unité d'éclairage
US9736896B2 (en) 2011-06-24 2017-08-15 Ams Ag Driver assembly and method for detecting an error condition of a lighting unit
DE102011087658A1 (de) * 2011-12-02 2013-06-06 Osram Gmbh Parallel geschaltete Leuchtketten
WO2013181853A1 (fr) * 2012-06-05 2013-12-12 深圳市华星光电技术有限公司 Système de rétro-éclairage del et dispositif d'affichage
EP2779795A1 (fr) * 2013-03-14 2014-09-17 Grote Industries, Inc. Circuit de détection d'une panne d'éclairage de véhicule
EP2783915A1 (fr) 2013-03-26 2014-10-01 Odelo GmbH Procédé de génération d'un signal de diagnostic d'une lampe de véhicule automobile dotée de plusieurs moyens d'éclairage et lampe de véhicule automobile
DE102015112404A1 (de) 2014-07-29 2016-02-04 Pintsch Bamag Antriebs- Und Verkehrstechnik Gmbh LED-Einheit für Lichtsignalgeber, Lichtsignalgeber mit einer solchen Einheit und Verfahren zur Überwachung eines LED-Strangs einer LED-Einheit
EP2979954A2 (fr) 2014-07-29 2016-02-03 PINTSCH BAMAG Antriebs- und Verkehrstechnik GmbH Unité del pour émetteur de signaux lumineux, émetteur de signaux lumineux ayant une telle unité et procédé de surveillance d'une chaine de del d'une unité del
DE102014216085A1 (de) 2014-08-13 2016-02-18 Automotive Lighting Reutlingen Gmbh Überwachungseinheit für ein eine Halbleiterlichtquelle umfassendes Lichtmodul für eine Beleuchtungseinrichtung eines Kraftfahrzeugs
FR3068562A1 (fr) * 2017-06-30 2019-01-04 Vignal Systems Procede et dispositif de controle-commande pour gyrophare

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Publication number Publication date
SI2247161T1 (sl) 2014-08-29
EP2247161B1 (fr) 2014-05-14

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