NZ617222A - Determining proportion of faulty leds in a traffic light display - Google Patents

Determining proportion of faulty leds in a traffic light display

Info

Publication number
NZ617222A
NZ617222A NZ617222A NZ61722208A NZ617222A NZ 617222 A NZ617222 A NZ 617222A NZ 617222 A NZ617222 A NZ 617222A NZ 61722208 A NZ61722208 A NZ 61722208A NZ 617222 A NZ617222 A NZ 617222A
Authority
NZ
New Zealand
Prior art keywords
leds
traffic light
light display
determining
proportion
Prior art date
Application number
NZ617222A
Inventor
Malcolm Young
Original Assignee
Aldridge Traffic Systems
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 filed Critical Aldridge Traffic Systems
Publication of NZ617222A publication Critical patent/NZ617222A/en

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]

Landscapes

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

Abstract

Disclosed is fault detector for determining a proportion of faulty LEDs in a traffic light display having a plurality of LEDs. The fault detector is comprised of a bridge circuit having a reference arm and a sensing arm formed from the LEDs aranged in parallel. The bridge circuit becomes unbalanced upon a fault in one or more of the LEDs. The fault detector also includes a differential amplifier for determining when the bridge cricuit is unbalanced.
NZ617222A 2007-05-22 2008-05-22 Determining proportion of faulty leds in a traffic light display NZ617222A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
NZ617222A true NZ617222A (en) 2014-07-25

Family

ID=40031322

Family Applications (1)

Application Number Title Priority Date Filing Date
NZ617222A NZ617222A (en) 2007-05-22 2008-05-22 Determining proportion of faulty leds in a traffic light display

Country Status (6)

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

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101894512B (en) * 2010-07-30 2015-09-16 深圳市中庆微科技开发有限公司 A kind of LED display fault early warning system
CN101944276B (en) * 2010-08-19 2016-01-20 深圳市中庆微科技开发有限公司 A kind of LED screen bad point monitoring and pre-alarming method and system
CN101964166A (en) * 2010-09-13 2011-02-02 南京通用电器有限公司 Circuit for detecting dead pixel of LED display screen and method thereof
EP2487998A1 (en) * 2011-02-09 2012-08-15 National Semiconductor Corporation Technique for identifying at least one faulty light emitting diode in a string of light emitting diodes
US8878461B2 (en) * 2011-06-30 2014-11-04 Applied Materials, Inc. Lamp failure detector
CZ305640B6 (en) 2013-01-29 2016-01-20 Varroc Lighting Systems, s.r.o. Fault detector circuit in a string of light emitting diodes
GB2566485B (en) * 2017-09-14 2020-04-29 Unipart Rail Ltd Rail signal arrangement for a rail signalling system
CN108417073A (en) * 2018-05-18 2018-08-17 上海会为智能技术有限公司 A kind of signal lamp running-state displaying method, device, equipment and medium
DE102021203550A1 (en) 2021-04-09 2022-10-13 Siemens Aktiengesellschaft Lighting device, emergency stop button and operating procedures

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2724749A1 (en) * 1994-09-15 1996-03-22 Sofrela Sa LED lamps with integral controller for road traffic control signals
GB9708861D0 (en) * 1997-04-30 1997-06-25 Signal House Limited Traffic signals
US6570505B1 (en) * 1997-12-30 2003-05-27 Gelcore Llc LED lamp with a fault-indicating impedance-changing circuit
DE29807002U1 (en) * 1998-04-17 1998-07-02 Garufo GmbH, 85410 Haag Signaling system
US6583731B2 (en) * 2001-04-19 2003-06-24 Singapore Technologies Electronics Ltd. Fault detection for traffic light systems using electronic lighting elements
DE10206649A1 (en) * 2002-02-15 2003-08-28 Garufo Gmbh display device
US7391335B2 (en) * 2005-08-18 2008-06-24 Honeywell International, Inc. Aerospace light-emitting diode (LED)-based lights life and operation monitor compensator

Also Published As

Publication number Publication date
WO2008141384A1 (en) 2008-11-27
EP2149130A1 (en) 2010-02-03
ZA200906703B (en) 2010-06-30
AU2008253601B2 (en) 2013-11-28
CN101796556A (en) 2010-08-04
AU2008253601A1 (en) 2008-11-27
WO2008141384A9 (en) 2010-11-25

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