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WO2008141384A1 - Détermination d'une proportion de diodes électroluminescentes défaillantes dans un afficheur de feux de circulation - Google Patents

Détermination d'une proportion de diodes électroluminescentes défaillantes dans un afficheur de feux de circulation Download PDF

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Publication number
WO2008141384A1
WO2008141384A1 PCT/AU2008/000712 AU2008000712W WO2008141384A1 WO 2008141384 A1 WO2008141384 A1 WO 2008141384A1 AU 2008000712 W AU2008000712 W AU 2008000712W WO 2008141384 A1 WO2008141384 A1 WO 2008141384A1
Authority
WO
WIPO (PCT)
Prior art keywords
leds
proportion
light display
traffic light
faulty
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.)
Ceased
Application number
PCT/AU2008/000712
Other languages
English (en)
Other versions
WO2008141384A9 (fr
Inventor
Malcolm Young
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.)
ALDRIDGE TRAFFIC SYSTEMS Pty Ltd
Original Assignee
ALDRIDGE TRAFFIC SYSTEMS Pty Ltd
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
Priority claimed from AU2007902743A external-priority patent/AU2007902743A0/en
Application filed by ALDRIDGE TRAFFIC SYSTEMS Pty Ltd filed Critical ALDRIDGE TRAFFIC SYSTEMS Pty Ltd
Priority to AU2008253601A priority Critical patent/AU2008253601B2/en
Priority to EP08747980A priority patent/EP2149130A1/fr
Priority to CN200880022706A priority patent/CN101796556A/zh
Publication of WO2008141384A1 publication Critical patent/WO2008141384A1/fr
Anticipated expiration legal-status Critical
Publication of WO2008141384A9 publication Critical patent/WO2008141384A9/fr
Ceased legal-status Critical Current

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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to a method and apparatus for determining a proportion of faulty light emitting diodes (hereinafter referred to as "LEDs") in a traffic light display or lantern.
  • LEDs faulty light emitting diodes
  • Knowledge that more than an allowable proportion of the LEDs in a display are faulty may enable traffic control equipment to turn off the faulty display, and for subsequent servicing of the traffic light display to occur.
  • an apparatus for determining a proportion of faulty LEDs i n a traffic light display havi ng a pl urality of LEDs comprising:-
  • (c) means for processing the signal indicative of the one or more faulty LEDs to determi ne the proportion of faulty LEDs in the traffic light display.
  • the processing means includes a threshold device that is activated when the proportion of faulty LEDs is more than an allowable proportion.
  • the apparatus further includes means for informing traffic control equipment of the activation of the threshold device.
  • the traffic light display may be turned off by the traffic control equipment when the threshold device is activated.
  • the processi ng means includes a differential amplifier which connects to both the common sensi ng point and to a voltage divider ci rcuit i n series with the common sensing point, wherein the potential difference between the common sensing point and the voltage divider circuit is dependent on the proportion of faulty LEDs in the traffic light display, the potential difference being converted to a signal that is indicative of the proportion of faulty LEDs in the traffic light display.
  • an assembly for controlling the operating status of a traffic lig ht display having a pl urality of LEDs comprising:-
  • (c) means for informing the traffic control equipment of the proportion of faulty LEDs in the traffic l ight display so that, when the proportion of faulty LEDs is more than an allowable proportion , the threshold device is activated to turn off the traffic light display.
  • a method for determining a proportion of LEDs with open circuit failures in an array of LEDs in a traffic light display the array of LEDs being arranged as a plurality of sections in parallel and in which each section includes a pair of LEDs in series, the method comprisi ng the steps of>
  • (c) providi ng a differential amplifier which connects to both the common sensing poi nt and to a voltage divider circuit in series with the common sensi ng point, wherein the potential difference between the common sensing point and the voltage divider circuit is dependent on the proportion of LEDs i n the array having open ci rcuit failures, the potential difference being converted to a signal for determining the proportion of LEDs with open circuit failures by the differential amplifier.
  • the proportion of LEDs with open circuit failures to be determined is more than an allowable proportion, and the method includes the further steps of: -
  • a method for controlling the operating status of a traffic light display having an array of LEDs arranged as a plurality of sections in parallel and in which each section includes a pair of LEDs in series, the method comprising the steps of:-
  • each LED section 12, 14, 16 consists of two LEDs and optionally a current limiting resistor in series.
  • a multiplicity of fault sensing resistors 18, 20, 22 is used to connect the centre point of each LED section to a common sensing point A.
  • a sensing signal that can conveniently be a 1 kHz square wave with a peak value corresponding to the total voltage applied to the LED sections is fed to point A through a resistor B.
  • a differential amplifier C is connected to point A and to a voltage divider circuit at D so arranged that, when all LEDs are operating correctly, the potential difference between A and D is small.
  • This is a bridge circuit.
  • a characteristic of a bridge circuit is that, when balanced, the output is at a minimum (about zero) and if the bridge is unbalanced then the output at E increases.
  • the degree on unbalance of the bridge is proportional to the number of LED sections that have an open circuit LED.
  • the output of the amplifier C will be a 1 kHz square wave whose amplitude is proportional to the number of LED sections with a faulty open circuit LED.
  • the square wave from C is fed to rectifier F and filter G and then to threshold device H which will be activated only when more than a chosen proportion of the LED sections are faulty.
  • the output from H may also be used to turn off the faulty lantern.

Landscapes

  • Traffic Control Systems (AREA)
  • Train Traffic Observation, Control, And Security (AREA)

Abstract

L'invention concerne un procédé servant à déterminer une proportion de diodes électroluminescentes possédant des défaillances de circuit ouvert dans un ensemble de diodes électroluminescentes dans un afficheur de feux de circulation, l'ensemble des diodes électroluminescentes étant disposé en une pluralité de sections en parallèle, chaque section comprenant une paire de diodes électroluminescentes en série, le procédé comprenant les étapes consistant à : - (a) prévoir une résistance de détection de défaillance qui se connecte entre chaque paire de diodes électroluminescentes en série et un point de détection commun, (b) envoyer un signal de détection d'une fréquence prédéterminée au point de détection commun, (c) prévoir un amplificateur différentiel qui se connecte à la fois au point de détection commun et à un circuit diviseur de tension, en série avec le point de détection commun, la différence de potentiel entre le point de détection commun et le circuit diviseur de tension dépendant de la proportion de diodes électroluminescentes de l'ensemble présentant des défaillances par circuit ouvert. La différence de potentiel est convertie en un signal afin de déterminer la proportion de diodes électroluminescentes présentant des défaillances par circuit ouvert au moyen de l'amplificateur différentiel.
PCT/AU2008/000712 2007-05-22 2008-05-22 Détermination d'une proportion de diodes électroluminescentes défaillantes dans un afficheur de feux de circulation Ceased WO2008141384A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU2008253601A AU2008253601B2 (en) 2007-05-22 2008-05-22 Determining proportion of faulty LEDs in a traffic light display
EP08747980A EP2149130A1 (fr) 2007-05-22 2008-05-22 Détermination d'une proportion de diodes électroluminescentes défaillantes dans un afficheur de feux de circulation
CN200880022706A CN101796556A (zh) 2007-05-22 2008-05-22 确定交通显示灯中发生故障的发光二极管的比例

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2007902743 2007-05-22
AU2007902743A AU2007902743A0 (en) 2007-05-22 Method and apparatus for determining the proportion of faulty light emitting diodes in a traffic light display

Publications (2)

Publication Number Publication Date
WO2008141384A1 true WO2008141384A1 (fr) 2008-11-27
WO2008141384A9 WO2008141384A9 (fr) 2010-11-25

Family

ID=40031322

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2008/000712 Ceased WO2008141384A1 (fr) 2007-05-22 2008-05-22 Détermination d'une proportion de diodes électroluminescentes défaillantes dans un afficheur de feux de circulation

Country Status (6)

Country Link
EP (1) EP2149130A1 (fr)
CN (1) CN101796556A (fr)
AU (1) AU2008253601B2 (fr)
NZ (1) NZ617222A (fr)
WO (1) WO2008141384A1 (fr)
ZA (1) ZA200906703B (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101894512A (zh) * 2010-07-30 2010-11-24 深圳市中庆微科技开发有限公司 一种led显示屏故障预警系统
EP2487998A1 (fr) * 2011-02-09 2012-08-15 National Semiconductor Corporation Technique pour identifier au moins une diode électroluminescente défectueuse dans une série de diodes électroluminescentes
CN103620755A (zh) * 2011-06-30 2014-03-05 应用材料公司 灯泡故障检测器
DE102014100738A1 (de) 2013-01-29 2014-07-31 Varroc Automotive Systems s.r.o. Fehlerkennungsschaltung für einen LED-Strang
CN108417073A (zh) * 2018-05-18 2018-08-17 上海会为智能技术有限公司 一种信号灯运行状态显示方法、装置、设备和介质
GB2566485A (en) * 2017-09-14 2019-03-20 Unipart Rail Ltd Rail signal arrangement for a rail signalling system
DE102021203550A1 (de) 2021-04-09 2022-10-13 Siemens Aktiengesellschaft Beleuchtungsvorrichtung, Notausschalter und Betriebsverfahren

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101944276B (zh) * 2010-08-19 2016-01-20 深圳市中庆微科技开发有限公司 一种led屏坏点监测预警方法和系统
CN101964166A (zh) * 2010-09-13 2011-02-02 南京通用电器有限公司 一种led显示屏坏点检测电路及检测方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2724749A1 (fr) * 1994-09-15 1996-03-22 Sofrela Sa Lampe a del pour bloc de signalisation routiere, comprenant des moyens de controle de son fonctionnement
DE29807002U1 (de) * 1998-04-17 1998-07-02 Garufo GmbH, 85410 Haag Signalanlage
WO1998049872A1 (fr) * 1997-04-30 1998-11-05 Signal House Limited Feux de signalisation
US20020154031A1 (en) * 2001-04-19 2002-10-24 Chan Hua Tek Fault detection for traffic light systems using electronic lighting elements
US6570505B1 (en) * 1997-12-30 2003-05-27 Gelcore Llc LED lamp with a fault-indicating impedance-changing circuit
EP1337130A2 (fr) * 2002-02-15 2003-08-20 Garufo GmbH Dispositif d' affichage
US20070040696A1 (en) * 2005-08-18 2007-02-22 Honeywell International Inc. Aerospace light-emitting diode (LED)-based lights life and operation monitor compensator

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2724749A1 (fr) * 1994-09-15 1996-03-22 Sofrela Sa Lampe a del pour bloc de signalisation routiere, comprenant des moyens de controle de son fonctionnement
WO1998049872A1 (fr) * 1997-04-30 1998-11-05 Signal House Limited Feux de signalisation
US6570505B1 (en) * 1997-12-30 2003-05-27 Gelcore Llc LED lamp with a fault-indicating impedance-changing circuit
DE29807002U1 (de) * 1998-04-17 1998-07-02 Garufo GmbH, 85410 Haag Signalanlage
US20020154031A1 (en) * 2001-04-19 2002-10-24 Chan Hua Tek Fault detection for traffic light systems using electronic lighting elements
EP1337130A2 (fr) * 2002-02-15 2003-08-20 Garufo GmbH Dispositif d' affichage
US20070040696A1 (en) * 2005-08-18 2007-02-22 Honeywell International Inc. Aerospace light-emitting diode (LED)-based lights life and operation monitor compensator

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101894512A (zh) * 2010-07-30 2010-11-24 深圳市中庆微科技开发有限公司 一种led显示屏故障预警系统
CN101894512B (zh) * 2010-07-30 2015-09-16 深圳市中庆微科技开发有限公司 一种led显示屏故障预警系统
EP2487998A1 (fr) * 2011-02-09 2012-08-15 National Semiconductor Corporation Technique pour identifier au moins une diode électroluminescente défectueuse dans une série de diodes électroluminescentes
US9345118B2 (en) 2011-06-30 2016-05-17 Applied Materials, Inc. Lamp failure detector
CN103620755A (zh) * 2011-06-30 2014-03-05 应用材料公司 灯泡故障检测器
CN103620755B (zh) * 2011-06-30 2016-06-22 应用材料公司 灯泡故障检测器
DE102014100738A1 (de) 2013-01-29 2014-07-31 Varroc Automotive Systems s.r.o. Fehlerkennungsschaltung für einen LED-Strang
US9341664B2 (en) 2013-01-29 2016-05-17 Varroc Lighting Systems, s.r.o. LED failure detection
CZ305640B6 (cs) * 2013-01-29 2016-01-20 Varroc Lighting Systems, s.r.o. Detektor poruchy v řetězci světlo emitujících diod
DE102014100738B4 (de) 2013-01-29 2019-08-08 Varroc Automotive Systems s.r.o. Fehlererkennungsschaltung für einen LED-Strang
GB2566485A (en) * 2017-09-14 2019-03-20 Unipart Rail Ltd Rail signal arrangement for a rail signalling system
GB2566485B (en) * 2017-09-14 2020-04-29 Unipart Rail Ltd Rail signal arrangement for a rail signalling system
US11383743B2 (en) 2017-09-14 2022-07-12 Unipart Rail Limited Rail signal arrangement for a rail signaling system
CN108417073A (zh) * 2018-05-18 2018-08-17 上海会为智能技术有限公司 一种信号灯运行状态显示方法、装置、设备和介质
DE102021203550A1 (de) 2021-04-09 2022-10-13 Siemens Aktiengesellschaft Beleuchtungsvorrichtung, Notausschalter und Betriebsverfahren

Also Published As

Publication number Publication date
CN101796556A (zh) 2010-08-04
WO2008141384A9 (fr) 2010-11-25
AU2008253601B2 (en) 2013-11-28
EP2149130A1 (fr) 2010-02-03
NZ617222A (en) 2014-07-25
ZA200906703B (en) 2010-06-30
AU2008253601A1 (en) 2008-11-27

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