EP1006759A2 - Système de surveillence d'une installation d'éclairage ou d'un dispositif de signalisation utilisant des diodes electroluminescentes comme sources lumineuses - Google Patents
Système de surveillence d'une installation d'éclairage ou d'un dispositif de signalisation utilisant des diodes electroluminescentes comme sources lumineuses Download PDFInfo
- 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
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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)
- Debugging And Monitoring (AREA)
- Emergency Protection Circuit Devices (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITFI980264 | 1998-12-04 | ||
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 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1006759A2 true EP1006759A2 (fr) | 2000-06-07 |
EP1006759A3 EP1006759A3 (fr) | 2003-04-23 |
EP1006759B1 EP1006759B1 (fr) | 2005-05-04 |
Family
ID=11352723
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99830640A Expired - Lifetime EP1006759B1 (fr) | 1998-12-04 | 1999-10-11 | Système de surveillance d'une installation d'éclairage ou d'un dispositif de signalisation utilisant des diodes electroluminescentes comme sources lumineuses |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1006759B1 (fr) |
DE (1) | DE69925092T2 (fr) |
ES (1) | ES2248977T3 (fr) |
IT (1) | IT1305051B1 (fr) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003067933A1 (fr) * | 2002-02-08 | 2003-08-14 | Ortana Elektronik Yazilim Taahhut Sanayi Ve Ticaret Ltd. Sti. | Feu de circulation intelligent a diode emettrice de lumiere |
WO2005079121A2 (fr) * | 2004-02-11 | 2005-08-25 | Peter Bhagat | Appareil de commande d'eclairage et procedes associes |
EP1641325A2 (fr) * | 2004-09-22 | 2006-03-29 | TECNOLOGIE MECCANICHE s.r.l. | Interface pour alimenter et superviser un dispositif de signalisation à leds, particulièrement adapté à être connecté à un réseau ferroviaire |
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***、故障诊断方法 |
EP2477463A1 (fr) * | 2011-01-17 | 2012-07-18 | Samsung LED Co., Ltd. | Appareil et procédé de détection de défaillances |
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)
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 |
Citations (7)
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 |
US5459328A (en) * | 1993-05-31 | 1995-10-17 | Fujitsu Limited | Driver circuit for light emitting elements connected in series and an optical amplifying repeater using the same |
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 |
US5644304A (en) * | 1992-07-22 | 1997-07-01 | Pavarotti; Remo | Automatic control system of lights in a series circuit illumination plant, in particular lights for airport signalling |
US5663719A (en) * | 1993-04-29 | 1997-09-02 | Electro-Tech's | LED traffic signal light with automatic low-line voltage compensating circuit |
WO1998015840A2 (fr) * | 1996-09-26 | 1998-04-16 | Denis Vadimovich Andreev | Systeme permettant de controler l'etat de plusieurs lampes |
WO1998049872A1 (fr) * | 1997-04-30 | 1998-11-05 | Signal House Limited | Feux de signalisation |
-
1998
- 1998-12-04 IT IT1998FI000264A patent/IT1305051B1/it active
-
1999
- 1999-10-11 DE DE69925092T patent/DE69925092T2/de not_active Expired - Fee Related
- 1999-10-11 EP EP99830640A patent/EP1006759B1/fr not_active Expired - Lifetime
- 1999-10-11 ES ES99830640T patent/ES2248977T3/es not_active Expired - Lifetime
Patent Citations (7)
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 |
US5644304A (en) * | 1992-07-22 | 1997-07-01 | Pavarotti; Remo | Automatic control system of lights in a series circuit illumination plant, in particular lights for airport signalling |
US5663719A (en) * | 1993-04-29 | 1997-09-02 | Electro-Tech's | LED traffic signal light with automatic low-line voltage compensating circuit |
US5459328A (en) * | 1993-05-31 | 1995-10-17 | Fujitsu Limited | Driver circuit for light emitting elements connected in series and an optical amplifying repeater using the same |
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 |
WO1998015840A2 (fr) * | 1996-09-26 | 1998-04-16 | Denis Vadimovich Andreev | Systeme permettant de controler l'etat de plusieurs lampes |
WO1998049872A1 (fr) * | 1997-04-30 | 1998-11-05 | Signal House Limited | Feux de signalisation |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003067933A1 (fr) * | 2002-02-08 | 2003-08-14 | Ortana Elektronik Yazilim Taahhut Sanayi Ve Ticaret Ltd. Sti. | Feu de circulation intelligent a diode emettrice de lumiere |
US8487545B2 (en) | 2004-02-11 | 2013-07-16 | Peter Bhagat | Apparatus for the control of lighting and associated methods |
WO2005079121A2 (fr) * | 2004-02-11 | 2005-08-25 | Peter Bhagat | Appareil de commande d'eclairage et procedes associes |
WO2005079121A3 (fr) * | 2004-02-11 | 2005-11-17 | Peter Bhagat | Appareil de commande d'eclairage et procedes associes |
EP1641325A2 (fr) * | 2004-09-22 | 2006-03-29 | TECNOLOGIE MECCANICHE s.r.l. | Interface pour alimenter et superviser un dispositif de signalisation à leds, particulièrement adapté à être connecté à un réseau ferroviaire |
EP1641325A3 (fr) * | 2004-09-22 | 2007-06-06 | TECNOLOGIE MECCANICHE s.r.l. | Interface pour alimenter et superviser un dispositif de signalisation à leds, particulièrement adapté à être connecté à un réseau ferroviaire |
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***、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 (fr) * | 2011-01-17 | 2012-07-18 | Samsung LED Co., Ltd. | Appareil et procédé de détection de défaillances |
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 |
---|---|
DE69925092D1 (de) | 2005-06-09 |
DE69925092T2 (de) | 2006-01-26 |
ITFI980264A0 (it) | 1998-12-04 |
ES2248977T3 (es) | 2006-03-16 |
EP1006759B1 (fr) | 2005-05-04 |
IT1305051B1 (it) | 2001-04-10 |
EP1006759A3 (fr) | 2003-04-23 |
ITFI980264A1 (it) | 2000-06-05 |
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