EP2014136A1 - Fehlererkennung von leuchtdioden - Google Patents
Fehlererkennung von leuchtdiodenInfo
- Publication number
- EP2014136A1 EP2014136A1 EP07724386A EP07724386A EP2014136A1 EP 2014136 A1 EP2014136 A1 EP 2014136A1 EP 07724386 A EP07724386 A EP 07724386A EP 07724386 A EP07724386 A EP 07724386A EP 2014136 A1 EP2014136 A1 EP 2014136A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- emitting diode
- light
- current
- diode array
- 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.)
- Granted
Links
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
-
- 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
- H05B47/23—Responsive to malfunctions or to light source life; for protection of two or more light sources connected in series
- H05B47/235—Responsive to malfunctions or to light source life; for protection of two or more light sources connected in series with communication between the lamps and a central unit
Definitions
- the invention relates to the field of detecting a failure of a light emitting diode.
- Light-emitting diodes have the advantage of a long service life, which is why they are often used, for example, for emergency lighting, which are automatically switched on when a mains supply for other lighting devices such as, for example, gas discharge lamps fails.
- the invention has for its object to provide a way of detecting a failure interruption of at least one light emitting diode.
- an operating circuit for a light-emitting diode array having one or more light emitting diodes connected in series, to each of which an element is connected in parallel, which takes over the current through the light emitting diode in case of interruption failure of a light emitting diode. It is further provided a detection unit which is designed to interrupt a failure of at least one light-emitting diode by detecting the temporal evolution of the diode current and the voltage at the light-emitting diode arrangement to recognize.
- the circuit may be configured to operate the LED array with constant power. In this case, an interruption failure is detected by an increase in the voltage across the light emitting diode array with simultaneous decrease in the current through the light emitting diode array.
- the circuit may alternatively be adapted to
- Light-emitting diode arrangement to operate with constant current. An interrupt failure is detected by an increase in the voltage across the light emitting diode array.
- the detection unit can be the power and
- Voltage ratios of the LED array detect continuously or at intervals.
- the detection unit can store the detected current and voltage conditions of the light-emitting diode arrangement in a memory and detect an interruption failure of at least one light-emitting diode by comparing current values of the current and voltage ratios of the light-emitting diode arrangement with at least one stored value.
- the circuit can be connected to an external data line and check the current and voltage conditions of the light-emitting diode array to a query on the external data line query out.
- the result of the externally requested check can be transmitted via the external data line.
- the light-emitting diode arrangement be designed as emergency lighting, which is automatically switched on in case of failure of the mains supply for main lighting.
- the detection unit may perform the monitoring of the time evolution of the diode current and / or the voltage across the light emitting diode array compensated with respect to the LED temperature.
- the detection unit can be supplied to a direct or indirect temperature information with respect to the LED temperature.
- Another aspect of the invention relates to a
- a detection unit detects an interruption failure of at least one light emitting diode by monitoring the timing of the diode current and the voltage across the light emitting diode array.
- FIG. 1 shows schematically a circuit according to the invention for operating and monitoring a light-emitting diode arrangement
- FIG. 2 shows the time evolution of the current through and the voltage across the light-emitting diode arrangement in the case of Operation of the light-emitting diode arrangement with regulated, in particular with constant power
- FIG. 3 shows a possibility for
- FIG. 4 shows a possibility for implementing the detection of the temporal
- FIG. 1 shows a light-emitting diode arrangement 1 which, in the exemplary embodiment, has several series-connected
- Light-emitting diodes 2 has. For each light-emitting diode 2, a protective element 3 is connected in parallel, which is designed to take over the power in the event of failure of the associated light-emitting diode 2, which has flowed through the light-emitting diode 2 before the failure.
- the protective element may in particular be an antiparallel-connected Zener diode 3.
- a control unit 4 controls and / or regulates the current and the voltage across the light emitting diode array 1.
- the control unit 4 performs a constant power operation or a constant current operation.
- the control unit 4 detects the actual prevailing actual current 8 by means of a measuring resistor 13 and possibly also the actual voltage 9 of the light-emitting diode arrangement 1 and evaluates it by a controller 10.
- the controller 10 then outputs a control variable for the current and / or power control.
- the controller 10 controls the control input 12 as a transistor implemented linear regulator 11, which is connected in series to the diode line on the low-voltage side.
- the control unit 4 may be functionally connected to an internal or external memory 5 in which at least one set of measured current and voltage values can be stored and read out for later comparison with the corresponding current values.
- the control unit 4 can furthermore have an interface 6 for connecting an external data line 7.
- the data line which may be a bus line 7
- desired values for the power and / or the current of the light-emitting diode arrangement 1 can be supplied, for example, from a control unit.
- instructions can also be supplied via this external data line 7, by means of which the execution of an error check can be instructed by the control unit and / or the result of such a check can be interrogated.
- control unit 4 can be designed to carry out the error check continuously, at intervals and / or by external commands.
- the result of the error check can then be displayed, reported or signaled.
- the error checking aims at detecting a breakdown failure of at least one light emitting diode 2, in which the parallel connected protective element 3 takes over the diode current.
- the control unit 4 monitors the time profile of the current and / or voltage conditions at the light-emitting diode arrangement 1.
- the time profile can be carried out by an evaluation unit 14 by comparing current values with (for example, stored) values from the past.
- the time derivative of the respective parameter can be determined, which will be explained in detail later with reference to FIG.
- the rapid time change in the event of a fault can be detected by means of a circuit which has a capacitor and / or an inductance.
- a failure is detected if the said evaluation results in a deviation that is greater than a predetermined threshold value.
- an error can be detected if there is a change over time in a short period of time.
- slower temperature drifts can be ruled out.
- the evaluation may be temperature compensated, i. the dependence of the diode characteristics on the temperature response is taken into account.
- the light-emitting diode arrangement 1 can be emergency lighting, in which proper operation is of particular importance.
- the remote inquiry described above may be important.
- FIG. 2 shows, as in the case of the operation of the light-emitting diode arrangement 1 with constant (regulated) power, in the event of an interruption error of at least one light-emitting diode 2 the current through the light emitting diode array 1 decreases as the voltage rises. This can be detected by detecting the time changes of current and voltage, for example by a circuit as shown in FIG.
- FIG. 3 shows a possibility of measuring the current and / or the voltage of the diode path 1.
- the current and / or power control is carried out by the control unit 4 by pulsed activation of a power switch 15 of a switching regulator, which continues to operate in a manner known per se Switch 15 energizable choke Lb, whose energy is discharged with open switch 15 via a diode Db on the diode path 1.
- a power switch 15 of a switching regulator which continues to operate in a manner known per se Switch 15 energizable choke Lb, whose energy is discharged with open switch 15 via a diode Db on the diode path 1.
- FIGS. 1 and 3 show possibilities for directly detecting the current and / or the voltage of the diode path
- FIG. 4 shows a possible implementation of the detection and evaluation of the time derivatives of the current and / or the voltage of the diode path.
- the current regulation is represented by means of a linear regulator in the form of a transistor 11 whose control terminal 12 is driven by the supply voltage U IN of the light-emitting diode path 1 divided by a voltage divider 16, 17.
- a measuring resistor 13 Via a measuring resistor 13, the current through the linear regulator 11th and thus the current i detected by the LED strip 1.
- the time change delta (i) of the diode current can be detected and then compared by a comparator 19 with a reference value I REF .
- the time change delta (U) of the diode voltage U is detected and compared by a comparator 21 with a reference value U REF .
- the output signals of the two comparators 19, 21 are supplied to a logic evaluation unit 22, which outputs, for example, an error message when the diode current decreases in a short time and at the same time the diode voltage rises, as shown in FIG.
- control unit can take into account a temperature information regarding the temperature of the light-emitting diodes during the fault detection, in order thus to compensate for the temperature dependence of the light-emitting diode forward voltage for a given current.
- the temperature measurement can be done directly via a temperature sensor or indirectly.
- the detection unit can determine, by means of access to a table stored in advance, the corrected forward voltage associated with the temperature of the light-emitting diodes and make them the basis for error detection.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11156563A EP2343954A3 (de) | 2006-04-21 | 2007-04-19 | Fehlererkennung von Leuchtdioden |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006018575A DE102006018575A1 (de) | 2006-04-21 | 2006-04-21 | Fehlererkennung von Leuchtdioden |
PCT/EP2007/003449 WO2007121927A1 (de) | 2006-04-21 | 2007-04-19 | Fehlererkennung von leuchtdioden |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11156563.6 Division-Into | 2011-03-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2014136A1 true EP2014136A1 (de) | 2009-01-14 |
EP2014136B1 EP2014136B1 (de) | 2013-12-11 |
Family
ID=37103158
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07724386.3A Active EP2014136B1 (de) | 2006-04-21 | 2007-04-19 | Fehlererkennung von leuchtdioden |
EP11156563A Withdrawn EP2343954A3 (de) | 2006-04-21 | 2007-04-19 | Fehlererkennung von Leuchtdioden |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11156563A Withdrawn EP2343954A3 (de) | 2006-04-21 | 2007-04-19 | Fehlererkennung von Leuchtdioden |
Country Status (3)
Country | Link |
---|---|
EP (2) | EP2014136B1 (de) |
DE (1) | DE102006018575A1 (de) |
WO (1) | WO2007121927A1 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008047731B4 (de) * | 2008-09-18 | 2020-06-04 | HELLA GmbH & Co. KGaA | Verfahren zur Fehlererkennung in einer Beleuchtungsvorrichtung |
DE102008048701B4 (de) * | 2008-09-24 | 2020-06-04 | HELLA GmbH & Co. KGaA | Verfahren zum Betrieb einer Reihenschaltung von mindestens zwei LED's |
FR2937492B1 (fr) * | 2008-10-16 | 2012-05-25 | A R P Signal | Dispositif de generation de lumiere et systeme a feux de signalisation utilisant un tel dispositif. |
DE102009017989A1 (de) * | 2009-04-21 | 2010-10-28 | Vossloh-Schwabe Optoelectronic Gmbh & Co. Kg | LED-Überwachungseinrichtung |
DE102009029909A1 (de) * | 2009-06-19 | 2010-12-23 | Hella Kgaa Hueck & Co. | Verfahren zur Ausfallerkennung von Leuchtdioden und Schaltungsanordnung |
DE102009031040A1 (de) * | 2009-06-30 | 2011-01-05 | GM Global Technology Operations, Inc., Detroit | Fahrzeug-Blinker, Fahrzeug-Blinker-Steuergerät und Verfahren zum Betreiben eines Fahrzeug-Blinker-Steuergeräts |
AT512751B1 (de) * | 2012-03-29 | 2015-03-15 | Din Dietmar Nocker Facilityman Gmbh | Schaltungsanordnung und Verfahren zum Testen eines Leuchtdiodenzweigs einer Schaltungsanordnung |
PL3125648T3 (pl) * | 2015-07-31 | 2023-04-24 | Yunex Gmbh | Obwód sterowania diodami elektroluminescencyjnymi dla sygnalizatora |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2150372B (en) * | 1983-11-25 | 1986-12-10 | Ferranti Plc | Lamp failure detector |
JP2991893B2 (ja) * | 1993-05-31 | 1999-12-20 | 富士通株式会社 | 発光素子の駆動回路及びこれを用いた光増幅中継器 |
DE19602891A1 (de) * | 1996-01-27 | 1997-08-07 | Kammerer Gmbh M | Verfahren und Anordnung zur Einstellung der Helligkeit eines strom- oder spannungsgesteuerten Leuchtmittels zur Hinterleuchtung einer Anzeige, insbesondere für Kraftfahrzeuge |
DE19841490B4 (de) | 1998-09-10 | 2005-06-30 | Infineon Technologies Ag | Schaltungsanordnung zum Schutz einer Serienschaltung aus mindestens zwei Leuchdioden vor dem Ausfall |
DE10025821A1 (de) * | 2000-05-25 | 2002-07-25 | Sickinger Monika | Led-Lichtquelle |
US6650064B2 (en) * | 2000-09-29 | 2003-11-18 | Aerospace Optics, Inc. | Fault tolerant led display design |
US6870328B2 (en) * | 2001-12-19 | 2005-03-22 | Toyoda Gosei Co., Ltd. | LED lamp apparatus for vehicles |
CA2391681A1 (en) * | 2002-06-26 | 2003-12-26 | Star Headlight & Lantern Co. Of Canada Ltd. | Solid-state warning light with microprocessor controlled excitation circuit |
US20050001562A1 (en) * | 2003-07-02 | 2005-01-06 | 911Ep, Inc. | LED compensation circuit |
JP4771354B2 (ja) * | 2004-09-17 | 2011-09-14 | 株式会社小糸製作所 | 車両用灯具の点灯制御回路 |
-
2006
- 2006-04-21 DE DE102006018575A patent/DE102006018575A1/de not_active Withdrawn
-
2007
- 2007-04-19 EP EP07724386.3A patent/EP2014136B1/de active Active
- 2007-04-19 EP EP11156563A patent/EP2343954A3/de not_active Withdrawn
- 2007-04-19 WO PCT/EP2007/003449 patent/WO2007121927A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2007121927A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2007121927A1 (de) | 2007-11-01 |
EP2343954A2 (de) | 2011-07-13 |
DE102006018575A1 (de) | 2007-10-25 |
EP2343954A3 (de) | 2012-06-06 |
EP2014136B1 (de) | 2013-12-11 |
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