WO2008065018A1 - Agencement de circuits et procédé de protection contre les pannes d'une chaîne de led ou de oled - Google Patents

Agencement de circuits et procédé de protection contre les pannes d'une chaîne de led ou de oled Download PDF

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Publication number
WO2008065018A1
WO2008065018A1 PCT/EP2007/062508 EP2007062508W WO2008065018A1 WO 2008065018 A1 WO2008065018 A1 WO 2008065018A1 EP 2007062508 W EP2007062508 W EP 2007062508W WO 2008065018 A1 WO2008065018 A1 WO 2008065018A1
Authority
WO
WIPO (PCT)
Prior art keywords
thyristor
circuit arrangement
led
oled
light
Prior art date
Application number
PCT/EP2007/062508
Other languages
German (de)
English (en)
Inventor
Oskar Schallmoser
Original Assignee
Osram Gesellschaft mit beschränkter Haftung
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 Osram Gesellschaft mit beschränkter Haftung filed Critical Osram Gesellschaft mit beschränkter Haftung
Publication of WO2008065018A1 publication Critical patent/WO2008065018A1/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]
    • H05B45/40—Details of LED load circuits
    • 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
    • H05B45/54—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a series array of LEDs

Definitions

  • Circuit arrangement and method for fail-safe operation of a LED or OLED chain are provided.
  • the present invention relates to a circuit arrangement for fail-safe operation of a chain of series-connected LED or OLED luminous elements, wherein each luminous element is connected in parallel with a thyristor or a TVS diode (Transient Voltage Suppression) in order, in the event of failure of one or more luminous elements, to operate the remaining ones To ensure functioning light elements of this chain by the thyristor or the TVS diode restores the connection between the remaining light elements.
  • a thyristor or a TVS diode Transient Voltage Suppression
  • LED or OLED lighting elements are used in a variety of lighting applications such as lighting. in large displays, signal lights used in motor vehicles etc. In most of these applications, a large number of light-emitting elements must be used. Since LEDs have a very low operating voltage, often several of these light elements are connected in series to improve the power distribution within the application.
  • the object of the present invention is therefore to provide a circuit arrangement with which the functionality of the luminous elements remaining in the chain is ensured in the event of a failure of at least one luminous element. This object is achieved by a circuit arrangement having the features of patent claim 1 and by a method having the features of patent claim 6.
  • the present invention is based on the finding that the above object can be achieved if each light-emitting element a protective element is connected in parallel, which monitors a failure of the light-emitting element and in the event that a light-emitting element has failed, the circuit closes again, so that the function the remaining lighting elements is guaranteed.
  • a thyristor is connected in parallel with each luminous element.
  • a thyristor replica of 2 transistors may be used instead of the thyristor.
  • a thyristor replica with 3 transistors is preferably used.
  • the thyristors / thyristor replicas are connected in such a way that they are switched off when the luminous elements function normally. If one of the lighting elements fails, then the thyristor connected in parallel or the thyristor simulation connected in parallel is switched on in a targeted manner in order to close the circuit interrupted by the defective lighting element and one again to ensure normal functioning of the remaining lighting elements of the chain.
  • a TVS diode is used instead of the thyristor, which requires no further wiring. If one light element fails, the TVS diode is deliberately overloaded, which destroys it. This is expressed in a short circuit of the diode, which thus closes the broken circuit again.
  • Fig. 1 The basic operation of the circuit arrangement according to the invention.
  • FIG. 2 shows the protective element of the circuit arrangement according to the invention in the embodiment with a thyristor
  • Fig. 3 The protective element of the circuit arrangement according to the invention in the embodiment with a Thyristornach Struktur with 2 transistors.
  • Fig. 4 The protective element of the circuit arrangement according to the invention in the embodiment with a Thyristornach Struktur with 3 transistors.
  • Fig. 5 The protective element of the circuit arrangement according to the invention in the embodiment with a TVS diode.
  • Fig. 1 shows a schematic representation of the structure of the circuit arrangement according to the invention. To every light element
  • a protective element (2) is connected in parallel. In case of failure of a lighting element (1), the protective element
  • Fig. 2 shows a first embodiment of the circuit arrangement according to the invention.
  • Each light element is a thyristor
  • the anode of the thyristor is connected to the anode of the luminous element (1), and the cathode of the thyristor (3) to the cathode of the luminous element (1).
  • the connection of the anode of the luminous element (1) with the anode of the thyristor (3) gives the connection point 1.
  • the connection of the cathode of the luminous element (1) with the cathode of the thyristor (3) gives the connection point 2.
  • a first resistor (4) is connected, between connection point 2 and the gate of the thyristor (3), a second resistor (5).
  • the connection of the thyristor with the two resistors gives the connection point 3.
  • the resistors are now designed so that the thyristor (3) is turned off when the light-emitting element (1) operates normally and the voltage corresponding to the lighting element between connection point 1 and connection point 2 is applied , If the light element fails, the voltage between connection point 1 and connection point 2 is substantially higher, so that the thyristor turns on, and the circuit closes again.
  • Fig. 3 shows a second embodiment of the circuit arrangement according to the invention.
  • a thyristor replica is used instead of the thyristor (3).
  • This consists of a PNP transistor (6) and an NPN transistor (7).
  • the emitter of the PNP transistor (6) is connected to the connection point 1.
  • the resistors are connected from the connection point 1 to the connection point 3 or from the connection point 2 to the connection point 3. The operation is the same as in the first embodiment, therefore, a repetitive explanation is omitted.
  • FIG. 4 shows a third embodiment of the circuit arrangement according to the invention.
  • This embodiment uses a thyristor replica suitable for high currents.
  • This consists in addition to the components of the second embodiment still of a second NPN transistor (8).
  • the emitter of the PNP transistor (6) is connected to the connection point 1.
  • the base of the PNP transistor (6) is connected to the collector of the NPN transistor (7).
  • the base of the NPN transistor (7) is connected to the collector of the PNP transistor (6) and to the connection point 3.
  • the emitter of the NPN transistor (7) is connected to the base of the NPN transistor (8).
  • the collector of the NPN transistor (8) is connected to the connection point 1.
  • the emitter of the NPN transistor (8) is connected to the connection point 2.
  • the resistors are connected from the connection point 1 to the connection point 3 or from the connection point 2 to the connection point 3. The operation is the same as in the first embodiment, therefore, a repetitive explanation is omitted.
  • Fig. 5 shows a fourth embodiment of the circuit arrangement according to the invention.
  • Luminous element (1) antiparallel TVS diode (9) used as a protective element.
  • the zener voltage is chosen so that the TVS diode (9) does not respond at normal forward voltage of the lighting element (1). If the light element falls

Landscapes

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

Abstract

L'invention concerne un agencement de circuits de protection contre les pannes d'une chaîne de LED ou de OLED, qui présente plusieurs éléments lumineux (1) à LED ou OLED raccordés en série. Un thyristor (3) qui en cas de défaillance de l'élément lumineux (1) rétablit la liaison électrique entre les autres éléments lumineux (1) est raccordé en parallèle sur chaque élément lumineux (1).
PCT/EP2007/062508 2006-11-30 2007-11-19 Agencement de circuits et procédé de protection contre les pannes d'une chaîne de led ou de oled WO2008065018A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006056712A DE102006056712A1 (de) 2006-11-30 2006-11-30 Schaltungsanordnung und Verfahren zur Ausfallsicherung einer LED-oder OLED-Kette
DE102006056712.9 2006-11-30

Publications (1)

Publication Number Publication Date
WO2008065018A1 true WO2008065018A1 (fr) 2008-06-05

Family

ID=38997912

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/062508 WO2008065018A1 (fr) 2006-11-30 2007-11-19 Agencement de circuits et procédé de protection contre les pannes d'une chaîne de led ou de oled

Country Status (3)

Country Link
DE (1) DE102006056712A1 (fr)
TW (1) TW200835390A (fr)
WO (1) WO2008065018A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008031029B4 (de) * 2008-06-30 2012-10-31 Texas Instruments Deutschland Gmbh Elektronisches Bauelement mit einer Schutzschaltung für eine lichtemittierende Vorrichtung
DE102009060791A1 (de) * 2009-12-22 2011-06-30 Automotive Lighting Reutlingen GmbH, 72762 Lichtmodul für eine Beleuchtungseinrichtung eines Kraftfahrzeugs sowie Beleuchtungseinrichtung eines Kraftfahrzeugs mit einem solchen Lichtmodul
TWI429161B (zh) * 2011-07-21 2014-03-01 Silicon Touch Tech Inc Shunt protection module for series device and its shunt protection method
EP2725613A1 (fr) * 2012-10-26 2014-04-30 Ceramate Technical (Suzhou) Co., Ltd. DEL avec deux pins qui repèrent des contingences d'ouverture, d'électricité statique et de surtension

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020043943A1 (en) * 2000-10-10 2002-04-18 Menzer Randy L. LED array primary display light sources employing dynamically switchable bypass circuitry
US20060176411A1 (en) * 2004-04-20 2006-08-10 Norimasa Furukawa Constant current driver, back light source and color liquid crystal display

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020043943A1 (en) * 2000-10-10 2002-04-18 Menzer Randy L. LED array primary display light sources employing dynamically switchable bypass circuitry
US20060176411A1 (en) * 2004-04-20 2006-08-10 Norimasa Furukawa Constant current driver, back light source and color liquid crystal display

Also Published As

Publication number Publication date
TW200835390A (en) 2008-08-16
DE102006056712A1 (de) 2008-06-05

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