EP0910934A1 - Circuit pour generateurs de signaux a diodes electroluminescentes - Google Patents

Circuit pour generateurs de signaux a diodes electroluminescentes

Info

Publication number
EP0910934A1
EP0910934A1 EP97931711A EP97931711A EP0910934A1 EP 0910934 A1 EP0910934 A1 EP 0910934A1 EP 97931711 A EP97931711 A EP 97931711A EP 97931711 A EP97931711 A EP 97931711A EP 0910934 A1 EP0910934 A1 EP 0910934A1
Authority
EP
European Patent Office
Prior art keywords
leds
group
circuit arrangement
circuit
arrangement according
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
EP97931711A
Other languages
German (de)
English (en)
Other versions
EP0910934B1 (fr
Inventor
Holger RÖSSNER
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.)
Ams Osram International GmbH
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0910934A1 publication Critical patent/EP0910934A1/fr
Application granted granted Critical
Publication of EP0910934B1 publication Critical patent/EP0910934B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/095—Traffic lights
    • 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
    • H05B45/42—Antiparallel configurations
    • 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
    • H05B45/59—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits for reducing or suppressing flicker or glow effects
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2111/00—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
    • F21W2111/02—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00 for roads, paths or the like

Definitions

  • the invention relates to a circuit arrangement for signal transmitters with light-emitting diodes (LEDs) for emitting colored light, according to the preamble of claim 1. It relates in particular to such a circuit arrangement for signal transmitters in road traffic signal systems.
  • LEDs light-emitting diodes
  • a conventional light bulb has been used in traffic signal systems or traffic lights to generate colored light, in front of which a colored filter plate is arranged.
  • the reflection of light sources acting on it can cause the colored filter plate of a switched-off traffic light to light up and it is not clear whether the corresponding signal is switched on or off.
  • Another disadvantage with the use of light bulbs is that they emit light in a broadband radiation spectrum and only a small percentage is filtered out in the desired color and therefore only a fraction of the energy used is used.
  • LEDs Light Emitting Diode
  • the LEDs produce almost monochrome light in the desired color and therefore do not require any filters which can cause the deceptive reflection described above.
  • LEDs almost 100% of the energy generated is converted into light of the desired color.
  • the use of LEDs, which are also known as luminescent diodes, in traffic light systems has so far only been used in prototypes and still has a number of problems.
  • the LEDs are operated with a ballast, which contains a power supply, possibly a controller and possibly a pulse generator for pulse operation of the LEDs.
  • the problem here is that the components used in the ballasts in accordance with DIN 0832 do not contain any exclusions of errors.
  • ballasts can therefore not be regarded as an intrinsically safe assembly. For this reason and since the ballasts are so complex overall that internal monitoring can no longer be carried out reliably, a sensory measurement or monitoring, in particular of a blocking signal, must be carried out. In traffic light systems, a red light is usually used as a blocking signal. Such complex ballasts, which also require failure detection, can only be produced at high costs.
  • the invention is based on the invention of creating a circuit arrangement for signal transmitters with LEDs for emitting colored light, which enables simple construction, reliable function and reliable monitoring.
  • This task is accomplished by a circuit arrangement with the
  • the LEDs are arranged in a circuit which is supplied with an alternating voltage and in which at least one bridge rectifier is arranged, through which the LEDs are controlled.
  • the LEDs are operated antiparallel on an AC voltage via a series resistor.
  • Each LED only lights up for half a period, which could lead to a noticeable flicker at a mains frequency.
  • this effect is avoided by the anti-parallel connection of the groups of LEDs. This means that there are virtually no dark periods for the entire module.
  • error exclusions can be claimed according to DIN 0832.
  • the first group of LEDs is preferably the same size as the second group of LEDs. This means that half the number of LEDs used in the circuit arrangement is operated antiparallel to the remaining LEDs of the circuit arrangement, so that the same number of LEDs lights up in both half-periods of the AC voltage.
  • the AC voltage is preferably generated by a transformer that transforms a mains voltage of 220 V down to a supply voltage between 10 and 40 V. An error exclusion according to DIN 0832 can also be claimed for the transformer.
  • the AC voltage is also favorable insofar as the advantages of pulse operation can also be claimed, since the half-wave of a sinusoidal AC voltage can lead to effects similar to those of a rectangular pulse. This is advantageous because a higher luminous efficacy can be achieved when the LEDs are operated in pulses than when operating in direct current.
  • the measure that two antiparallel operated LEDs are combined in one housing advantageously means that the number of components is reduced.
  • a jumping of light points is also advantageously reduced, since the LEDs of the same color emit are so close together that they appear to the outside like a luminous point. The remaining one
  • MULTILEDS can be used for this purpose (MULTILED is a registered trademark of Siemens AG).
  • each of the two groups of LEDs consists of a plurality of electrical strings connected in parallel, each of which has a plurality of LEDs connected in series. These electrical strands are still connected to each other at all connection points of the individual LEDs. Overall, this results in a grid or array and, as a result of this and also because of the parallel connection of different electrical LED strings, can be classified as multiple redundant.
  • a diffusing screen is attached in front of the LEDs, by means of which a flickering that may be recognizable to the viewer due to light points that jump back and forth is avoided, since the diffusing screen makes it impossible for the viewer to locate the visible light.
  • FIGS. 1 and 2 Show it Figure 1 is a schematic representation of the performance example and Figure 2 is a schematic representation of an LED housing.
  • a secondary-side circuit 1 a transformer 2, a series resistor 3, twelve LEDs 4 to 15 and cross connections 16 and 17 are shown.
  • a total of six LEDs 4 to 9 and six LEDs 10 to 15 form a first and a second group of LEDs which are connected antiparallel to one another, that is to say the LEDs 4 to 9 of the first group lie opposite to one another in the circuit with regard to their forward direction, like LEDs 10 to 15 of the second group.
  • Each group consists of several strings 18, 19, 20, 21 connected in parallel and LEDs connected in the same direction of passage.
  • the LEDs 4, 5 and 6 form a strand 18 of the first group and are connected antiparallel to the strand 19 with the LEDs 10, 11 and 12 of the second group.
  • the individual strands 18, 19, 20, 21 are also connected to one another by electrical cross connections 16 and 17 between connection points of the individual LEDs of a strand 18, 19, 20, 21 and thus form an array or a matrix.
  • Each connection point between two LEDs of a strand 18, 19, 20, 21 is preferably connected to exactly one connection point between two LEDs of each other strand by such cross connections.
  • two strands connected antiparallel to each other only have cross connections with one another and the strand pairs formed in this way are only connected in parallel with one another and have no cross connections.
  • One group of LEDs is driven by one half-wave of the alternating current and the other group by the other half-wave.
  • LEDs 4 and 12, 5 and 11 and 9 and 13 When using components that each combine two LEDs in an LED housing, such as in a MULTILED SMD housing 22 (FIG. 2) (registered trademark of Siemens AG), LEDs 4 and 12, 5 and 11 and 9 and 13 combined to form a component with two chips of the same color.
  • the circuit 1 is supplied by the transformer 2 with an alternating voltage of 10 to 40 V for the operation of the LEDs 4 to 15.
  • the primary-side 220 V alternating current of the voltage supply is therefore outside the LED circuit arrangement.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Traffic Control Systems (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)

Abstract

L'invention concerne un circuit pour générateurs de signaux dans des installations de circulation routière, comportant des diodes électroluminescentes (4 à 15) pour émettre une lumière colorée. Ce circuit est alimenté par une tension alternative et présente deux groupes de diodes électroluminescentes (4 à 9 et 10 à 15) montées de manière antiparallèle. L'invention permet d'obtenir un ensemble générateur de signaux simple, facile à surveiller et à sécurité intrinsèque.
EP97931711A 1996-07-08 1997-07-08 Circuit pour generateurs de signaux a diodes electroluminescentes Expired - Lifetime EP0910934B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19627475A DE19627475C2 (de) 1996-07-08 1996-07-08 Schaltungsanordnung für Signalgeber in Straßenverkehrsanlagen
DE19627475 1996-07-08
PCT/DE1997/001434 WO1998002020A1 (fr) 1996-07-08 1997-07-08 Circuit pour generateurs de signaux a diodes electroluminescentes

Publications (2)

Publication Number Publication Date
EP0910934A1 true EP0910934A1 (fr) 1999-04-28
EP0910934B1 EP0910934B1 (fr) 2002-01-16

Family

ID=7799245

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97931711A Expired - Lifetime EP0910934B1 (fr) 1996-07-08 1997-07-08 Circuit pour generateurs de signaux a diodes electroluminescentes

Country Status (7)

Country Link
EP (1) EP0910934B1 (fr)
JP (1) JP2001524249A (fr)
KR (1) KR20000023652A (fr)
BR (1) BR9710151A (fr)
CA (1) CA2260210A1 (fr)
DE (2) DE19627475C2 (fr)
WO (1) WO1998002020A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001054095A2 (fr) * 2000-01-20 2001-07-26 Giacaman Miguel S Systeme de commande de trafic intrinsequement sur, procede et appareil optimises pour signaux de trafic inherents a une polarite

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999020085A1 (fr) * 1997-10-10 1999-04-22 Se Kang Electric Co., Ltd. Circuit de lampe electrique et structure utilisant des diodes electroluminescentes
DE19802895A1 (de) * 1998-01-21 1999-07-22 Siemens Ag Schaltung zum Betreiben eines LED-Leuchtzeichens
DE10013207B4 (de) * 2000-03-17 2014-03-13 Tridonic Gmbh & Co Kg Ansteuerung von Leuchtdioden (LED's)
US6853150B2 (en) 2001-12-28 2005-02-08 Koninklijke Philips Electronics N.V. Light emitting diode driver
DE602006012951D1 (de) 2005-02-25 2010-04-29 Murata Manufacturing Co Led-beleuchtungsvorrichtung
KR100843402B1 (ko) 2007-06-22 2008-07-03 삼성전기주식회사 Ｌｅｄ 구동회로 및 ｌｅｄ 어레이 장치
DE102008004507A1 (de) * 2008-01-16 2009-07-23 Ralf Hitzing Leuchtkörper
JP5484144B2 (ja) * 2010-03-23 2014-05-07 大同信号株式会社 Ｇ形ｌｅｄ信号電球
PL402676A1 (pl) * 2010-07-28 2013-11-12 Momentive Performance Materials Inc. Aparat do przetwarzania materialów w wysokich temperaturach i przy wysokim cisnieniu
KR101286268B1 (ko) 2012-08-30 2013-07-15 이은주 엘이디 드라이브 박스를 포함하는 엘이디 신호장치 및 이를 이용한 신호 방법

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2350034A1 (fr) * 1976-04-26 1977-11-25 Gaillard Jean Utilisation de voyants electroluminescents semi-conducteurs pour feux de signalisation verts, jaunes ou rouges
JPS556687A (en) * 1978-06-29 1980-01-18 Handotai Kenkyu Shinkokai Traffic use display
US4271408A (en) * 1978-10-17 1981-06-02 Stanley Electric Co., Ltd. Colored-light emitting display
DE3230975A1 (de) * 1982-08-20 1984-02-23 Robert Bosch Gmbh, 7000 Stuttgart Kraftfahrzeugleuchte aus leuchtdioden oder leuchtdiodenchips
AT384916B (de) * 1986-01-17 1988-01-25 Siemens Ag Oesterreich Zusatzschaltung fuer in serie liegende infrarotdioden
US4939426A (en) * 1987-03-19 1990-07-03 United States Of America Light emitting diode array

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9802020A1 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001054095A2 (fr) * 2000-01-20 2001-07-26 Giacaman Miguel S Systeme de commande de trafic intrinsequement sur, procede et appareil optimises pour signaux de trafic inherents a une polarite
WO2001054095A3 (fr) * 2000-01-20 2001-12-20 Miguel S Giacaman Systeme de commande de trafic intrinsequement sur, procede et appareil optimises pour signaux de trafic inherents a une polarite
US6577247B2 (en) 2000-01-20 2003-06-10 Miguel S. Giacaman Intrinsically safe traffic control system, method and apparatus optimized for inherent-polarity traffic signals

Also Published As

Publication number Publication date
DE59706017D1 (de) 2002-02-21
KR20000023652A (ko) 2000-04-25
DE19627475A1 (de) 1998-01-15
EP0910934B1 (fr) 2002-01-16
BR9710151A (pt) 1999-08-10
JP2001524249A (ja) 2001-11-27
WO1998002020A1 (fr) 1998-01-15
DE19627475C2 (de) 2000-12-07
CA2260210A1 (fr) 1998-01-15

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