EP1006759A2 - Anordnung zur Überwachung einer Beleuchtungseinrichtung oder einer Signalisierungsanordnung mit mehreren Lichtquellen vom LED Typ - Google Patents

Anordnung zur Überwachung einer Beleuchtungseinrichtung oder einer Signalisierungsanordnung mit mehreren Lichtquellen vom LED Typ Download PDF

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Publication number
EP1006759A2
EP1006759A2 EP99830640A EP99830640A EP1006759A2 EP 1006759 A2 EP1006759 A2 EP 1006759A2 EP 99830640 A EP99830640 A EP 99830640A EP 99830640 A EP99830640 A EP 99830640A EP 1006759 A2 EP1006759 A2 EP 1006759A2
Authority
EP
European Patent Office
Prior art keywords
microprocessor
series
light
leds
light points
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
EP99830640A
Other languages
English (en)
French (fr)
Other versions
EP1006759A3 (de
EP1006759B1 (de
Inventor
Redi Paolo
Lori Lorenzo
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.)
Sei Sistemi Energetici Integrati Srl
Original Assignee
Sei Sistemi Energetici Integrati Srl
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Filing date
Publication date
Application filed by Sei Sistemi Energetici Integrati Srl filed Critical Sei Sistemi Energetici Integrati Srl
Publication of EP1006759A2 publication Critical patent/EP1006759A2/de
Publication of EP1006759A3 publication Critical patent/EP1006759A3/de
Application granted granted Critical
Publication of EP1006759B1 publication Critical patent/EP1006759B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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]
    • H05B45/50—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

Definitions

  • the invention relates to an intrinsically safe system for monitoring the operation of lighting installations or signaling equipment in general, comprising a plurality of light points, for example LEDs.
  • a possible application of said system is for monitoring signaling lamps for air navigation, such as those with 360° illumination, comprising matrices of LEDs extending over a truncated pyramidal theoretical surface or similar.
  • Another application is for LED signals for railroad use. In these cases, the LEDs are frequently divided into groups (or "strings") in each of which the LEDs are connected in series with each other; the various groups of LEDs can be supplied in parallel with each other by means of a stabilizing circuit.
  • the invention can be used for monitoring the integrity of emitters made from a large number of LEDs, this monitoring being of the intrinsically safe type.
  • the applications may relate to lamps signaling obstacles to air navigation, but also to other types of signaling equipment for applications in the railroad or marine fields, for example.
  • the invention relates to a system of monitoring the regularity of operation of a lighting installation or light signaling equipment of the type comprising at least one group of light points of the LED or similar type, supplied in series with direct current.
  • Said system according to the invention comprises:
  • the monitoring system is applicable to a lighting installation or light signaling equipment of the type comprising a plurality of groups or "strings", in other words series, of light points of the LED or similar type, the light points or LEDs of each of the groups being connected in series with each other.
  • the system comprises:
  • the microprocessor is capable of generating pulses at a predetermined frequency, with an interruption in case of a change at one of the inputs;
  • the detector in turn comprises a relay associated with a rectifier and a transformer; the relay changes its state if there is an interruption of the pulses at the predetermined frequency, and this triggers an appropriate alarm.
  • the relay can cause the opening of an alarm circuit, in case of an interruption of the pulses at the predetermined frequency or any other anomaly, including the interruption of the power supply to the light points and/or to the microprocessor.
  • the monitoring system in question may also comprise at least two microprocessors, each of which monitors part of the groups, or strings, of light points; in this case, the relays connected to said microprocessors may be arranged in series in a single circuit, which is opened by the release of any one of the relays.
  • the drawing shows a circuit diagram which implements the monitoring of a plurality (strings) of light points, of the LED type for example.
  • the numerals 1, 3, 5, 7, etc. indicate a plurality of groups or "strings" of light points, in practice LEDs or similar; in the drawing, each group comprises corresponding LEDs 1A, 3A, 5A, etc., the total number being, for example, eight; 1 B, 3B, 5B, etc. indicate corresponding individual direct current generators for the individual groups, which are then connected to a ground.
  • lines 1 E, 3E, 5E, 7E, etc. are branched off and run to the same number of inputs of a microprocessor 9.
  • the microprocessor 9 is programmed to supply at the output 10 an alternating signal, such as that indicated by SA, which is sent to a detector indicated in a general way by 12.
  • this detector 12 comprises a step-up transformer 12A, a rectifier 12B and a relay 12C; the contacts of the relay provide continuity for a signaling or alarm circuit 14, which is open when the relay is not energized, and in practice when there is an interruption in the alternating signal SA or when the signal SA becomes static as a result of a fault in the microprocessor following the short-circuiting or cut-off of an LED.
  • the microprocessor 9 which by means of an analog/digital converter monitors by scanning the continuity of the power supply of each of the strings 1, 3, 5, etc.
  • the microprocessor 9 emits at its output 10 a high logical signal SA (for example, a voltage of 5 V which is periodically brought to the zero value by the program); this alternating signal SA supplies - with pulses whose frequency is predetermined by the resident program - the primary of the transformer 12A.
  • SA high logical signal
  • SA for example, a voltage of 5 V which is periodically brought to the zero value by the program
  • this alternating signal SA supplies - with pulses whose frequency is predetermined by the resident program - the primary of the transformer 12A.
  • an alternating voltage is induced across the terminals of the secondary of the transformer 12A, and this voltage is rectified by means of the diode rectifier 12B so that the coil of the electromechanical relay 12C is supplied with virtually direct current.
  • the relay 12C remains energized and the circuit 14 is not interrupted.
  • the method by which the microprocessor identifies a fault in the LEDs may be: (I) a faulty LED which may cut itself off (the most frequent condition overall) or become short-circuited (a fairly rare condition). In each case, there is a change at an input of the microprocessor.
  • a string consisting, according to the example, of eight LEDs arranged in series and supplied with a direct current of 20 mA, has a voltage of approximately 12 V at the point 1 C or 3C or 5C at the mid-point of the string in normal conditions. If any of the LEDs of the string in question is cut off, this voltage takes a permanent value. However, if an LED becomes short-circuited, the voltage increases to approximately 14 V.
  • the microprocessor 9 continuously measures, by regular scanning in a predetermined cycle, the voltage present at the mid-point of the string (points 1C, 3C, 5C, etc.); if the voltage takes a value other than 12 V, such as 0 V or 14 V, the microprocessor detects the fault, and the supply to the primary of the transformer 12A ceases.
  • the supply to the primary of the transformer 12A is generated by a logical signal at the output of the microprocessor, which, in normal operating conditions, varies from high to low with a frequency which is determined by the resident program which controls the operation of the microprocessor.
  • the program is responsible for continuously varying the state of the logical signal which is high if the LEDs are sound and becomes low if any LED goes out of service. Any fault in the microprocessor stops the running of the program and consequently prevents the switching of the logical state at the output from high to low.
  • the logical output of the microprocessor in case of a fault, may remain permanently in a high or a low state, but cannot vary with the same frequency as that present if the component is unimpaired.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Debugging And Monitoring (AREA)
EP99830640A 1998-12-04 1999-10-11 Anordnung zur Überwachung einer Beleuchtungseinrichtung oder einer Signalisierungsanordnung mit mehreren Lichtquellen vom LED Typ Expired - Lifetime EP1006759B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1998FI000264A IT1305051B1 (it) 1998-12-04 1998-12-04 Sistema di controllo di un impianto di illuminazione o segnalazioneluminosa avente una molteplicita' di punti luce a led o simili
ITFI980264 1998-12-04

Publications (3)

Publication Number Publication Date
EP1006759A2 true EP1006759A2 (de) 2000-06-07
EP1006759A3 EP1006759A3 (de) 2003-04-23
EP1006759B1 EP1006759B1 (de) 2005-05-04

Family

ID=11352723

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99830640A Expired - Lifetime EP1006759B1 (de) 1998-12-04 1999-10-11 Anordnung zur Überwachung einer Beleuchtungseinrichtung oder einer Signalisierungsanordnung mit mehreren Lichtquellen vom LED Typ

Country Status (4)

Country Link
EP (1) EP1006759B1 (de)
DE (1) DE69925092T2 (de)
ES (1) ES2248977T3 (de)
IT (1) IT1305051B1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003067933A1 (en) * 2002-02-08 2003-08-14 Ortana Elektronik Yazilim Taahhut Sanayi Ve Ticaret Ltd. Sti. Smart led traffic lamp
WO2005079121A3 (en) * 2004-02-11 2005-11-17 Peter Bhagat Apparatus for the control of lighting and associated methods
EP1641325A3 (de) * 2004-09-22 2007-06-06 TECNOLOGIE MECCANICHE s.r.l. Schnittstelle zum Betreiben und Überwachen von Led-Anzeigen, insbesondere zum Anschluss an Eisenbahnnetze
CN102033174A (zh) * 2010-09-30 2011-04-27 中国铁路通信信号上海工程集团有限公司 指示器及其故障诊断系统、故障诊断方法
EP2477463A1 (de) * 2011-01-17 2012-07-18 Samsung LED Co., Ltd. Vorrichtung und Verfahren zur Fehlererkennung
US8607106B2 (en) 2010-10-25 2013-12-10 Himax Analogic, Inc. Channel detection device
TWI625532B (zh) * 2017-03-21 2018-06-01 失效偵測系統及其方法
US10085333B1 (en) 2017-03-21 2018-09-25 Macroblock, Inc. LED failure detecting device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4926784B2 (ja) * 2007-03-29 2012-05-09 株式会社小糸製作所 発光装置
US10187955B2 (en) * 2017-06-09 2019-01-22 Infineon Technologies Ag Detection of single short-LED in LED chains
DE102019208132A1 (de) * 2019-06-04 2020-12-10 Heraeus Noblelight Gmbh Anordnung mit belichtungseinrichtung und messeinrichtung, beinhaltend eine elektrische messschaltung und eine selektionsschaltung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5359325A (en) * 1991-10-03 1994-10-25 Cooper Industries, Inc. Automatic monitoring system for airfield lighting systems
IT1256123B (it) * 1992-07-22 1995-11-29 Sistema di controllo automatico delle luci di un impianto di illuminazione a circuito serie,in particolare delle lampade di segnalazione aereoportuali.
US5457450A (en) * 1993-04-29 1995-10-10 R & M Deese Inc. LED traffic signal light with automatic low-line voltage compensating circuit
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
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
RU2127030C1 (ru) * 1996-09-26 1999-02-27 Андреев Денис Вадимович Система контроля состояния множества ламп
GB9708861D0 (en) * 1997-04-30 1997-06-25 Signal House Limited Traffic signals

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003067933A1 (en) * 2002-02-08 2003-08-14 Ortana Elektronik Yazilim Taahhut Sanayi Ve Ticaret Ltd. Sti. Smart led traffic lamp
US8487545B2 (en) 2004-02-11 2013-07-16 Peter Bhagat Apparatus for the control of lighting and associated methods
WO2005079121A3 (en) * 2004-02-11 2005-11-17 Peter Bhagat Apparatus for the control of lighting and associated methods
EP1641325A3 (de) * 2004-09-22 2007-06-06 TECNOLOGIE MECCANICHE s.r.l. Schnittstelle zum Betreiben und Überwachen von Led-Anzeigen, insbesondere zum Anschluss an Eisenbahnnetze
CN102033174A (zh) * 2010-09-30 2011-04-27 中国铁路通信信号上海工程集团有限公司 指示器及其故障诊断系统、故障诊断方法
US8607106B2 (en) 2010-10-25 2013-12-10 Himax Analogic, Inc. Channel detection device
CN102612236A (zh) * 2011-01-17 2012-07-25 三星Led株式会社 用于感测故障的设备和方法
EP2477463A1 (de) * 2011-01-17 2012-07-18 Samsung LED Co., Ltd. Vorrichtung und Verfahren zur Fehlererkennung
US9013188B2 (en) 2011-01-17 2015-04-21 Samsung Electronics Co., Ltd. Apparatus and method for sensing failure
TWI571178B (zh) * 2011-01-17 2017-02-11 三星電子股份有限公司 用於感測故障之設備及方法
TWI625532B (zh) * 2017-03-21 2018-06-01 失效偵測系統及其方法
US10085333B1 (en) 2017-03-21 2018-09-25 Macroblock, Inc. LED failure detecting device
US10117304B2 (en) 2017-03-21 2018-10-30 Macroblock, Inc. LED failure detecting device

Also Published As

Publication number Publication date
EP1006759A3 (de) 2003-04-23
DE69925092T2 (de) 2006-01-26
IT1305051B1 (it) 2001-04-10
ITFI980264A0 (it) 1998-12-04
ES2248977T3 (es) 2006-03-16
EP1006759B1 (de) 2005-05-04
DE69925092D1 (de) 2005-06-09
ITFI980264A1 (it) 2000-06-05

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