JP2000172986A - Fault detector of signal lamp - Google Patents
Fault detector of signal lampInfo
- Publication number
- JP2000172986A JP2000172986A JP10347021A JP34702198A JP2000172986A JP 2000172986 A JP2000172986 A JP 2000172986A JP 10347021 A JP10347021 A JP 10347021A JP 34702198 A JP34702198 A JP 34702198A JP 2000172986 A JP2000172986 A JP 2000172986A
- Authority
- JP
- Japan
- Prior art keywords
- led
- failure
- monitor
- display
- light
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
- B61L5/12—Visible signals
- B61L5/18—Light signals; Mechanisms associated therewith, e.g. blinders
- B61L5/1809—Daylight signals
- B61L5/1881—Wiring diagrams for power supply, control or testing
-
- 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
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
- H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L2207/00—Features of light signals
- B61L2207/02—Features of light signals using light-emitting diodes [LEDs]
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Traffic Control Systems (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、発光源にＬＥＤ
（発光ダイオード）を用いた信号灯の故障検出装置に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention
The present invention relates to a signal light failure detection device using (light emitting diodes).
【０００２】[0002]
【従来の技術】近年、高効率，高輝度のＬＥＤが開発さ
れ、鉄道信号機，交通信号機等に使用されるようになっ
てきた。この種の信号機における信号灯では、所要の輝
度を得るため、またＬＥＤ等の故障により全滅灯となら
ないように、多数のＬＥＤを直列接続した直列回路を、
更に多数並列接続した直並列回路の形に構成している。2. Description of the Related Art Recently, high-efficiency, high-brightness LEDs have been developed and used for railway traffic signals, traffic signals, and the like. In a signal lamp of this type of traffic light, a series circuit in which a large number of LEDs are connected in series is used to obtain a required brightness and to prevent the lamp from being completely extinguished due to a failure of the LED or the like.
Furthermore, it is configured in the form of a series-parallel circuit in which a number of parallel connections are made.
【０００３】そして、この信号灯の故障検出には、次の
，のような方式が知られている。The following methods are known for detecting the failure of the signal light.
【０００４】信号灯の電流をコモン線で計測し、その
電流の減少によりＬＥＤのオープン故障を検出する。The current of a signal lamp is measured by a common line, and an open failure of the LED is detected based on a decrease in the current.
【０００５】信号灯の各ＬＥＤ直列回路の電流をフォ
トカプラで監視することにより、オープン故障を検出す
る。An open fault is detected by monitoring the current of each LED series circuit of the signal lamp with a photocoupler.
【０００６】[0006]
【発明が解決しようとする課題】前記の方式は、電球
式の信号灯に用いられている方式である。電球の故障と
してはフィラメントの断線がほとんどであり、この時信
号灯の電流が減少するため、異常検出が可能である。The above-mentioned system is a system used for a bulb-type signal light. Most of the bulb failures are caused by the breakage of the filament. At this time, the current of the signal lamp decreases, so that an abnormality can be detected.
【０００７】しかし、ＬＥＤ信号灯に応用すると、ＬＥ
Ｄの故障モードは、オープン，ショート，寿命による発
光量の低下等があり、オープン故障は検出できるが、シ
ョート故障や寿命による発光量の低下は検出できないと
いう問題がある。However, when applied to LED signal lights, LE
The failure mode of D includes an open, short circuit, and a decrease in the amount of light emission due to a lifetime, and an open failure can be detected.
【０００８】前記の方式も同様であり、オープン故障
は検出できるが、ショート故障や寿命による発光量の低
下は検出できないという問題がある。[0008] The above-mentioned method is also the same, and although an open failure can be detected, there is a problem that a short-circuit failure or a decrease in the amount of light emission due to life cannot be detected.
【０００９】本発明は、このような状況のもとでなされ
たもので、表示用ＬＥＤのオープン故障および寿命によ
る発光量の低下が検出できる信号灯の故障検出装置を提
供することを目的とするものである。The present invention has been made under such circumstances, and it is an object of the present invention to provide a signal lamp failure detecting device capable of detecting an open failure of a display LED and a decrease in the amount of light emission due to a lifetime. It is.
【００１０】[0010]
【課題を解決するための手段】前記目的を達成するた
め、本発明では、信号灯の故障検出装置を次の（１）〜
（４）のとおりに構成する。In order to achieve the above object, according to the present invention, a failure detecting device for a signal lamp is provided as follows.
The configuration is as shown in (4).
【００１１】（１）表示用ＬＥＤとこの表示用ＬＥＤと
同一製造ロットのモニタ用ＬＥＤとを直列接続した直列
回路と、前記モニタ用ＬＥＤの発光量を検出する検出手
段と、この検出手段で検出した発光量が所定値以下にな
った場合に、信号灯故障を判定する判定手段とを備えた
信号灯の故障検出装置。(1) A series circuit in which display LEDs and monitor LEDs of the same production lot as the display LEDs are connected in series, detection means for detecting the amount of light emitted from the monitor LEDs, and detection by the detection means A failure detecting device for a signal light, comprising: determining means for determining a signal light failure when the amount of emitted light falls below a predetermined value.
【００１２】（２）表示用ＬＥＤとこの表示用ＬＥＤと
同一製造ロットのモニタ用ＬＥＤとを直列接続した直列
回路を複数並列接続した直並列回路と、この直並列回路
における全モニタ用ＬＥＤの夫々の発光量を検出する検
出手段と、この検出手段で検出した前記夫々の発光量の
少なくとも一量が所定値以下になった場合に、信号灯故
障を判定する判定手段とを備えた信号灯の故障検出装
置。(2) A series-parallel circuit in which a plurality of display LEDs and series-connected monitor LEDs of the same production lot as the display LEDs are connected in parallel, and all the monitor LEDs in this series-parallel circuit Detecting means for detecting a signal light failure, and determining means for determining a signal light failure when at least one of the respective light emission amounts detected by the detecting means becomes a predetermined value or less. apparatus.
【００１３】（３）前記（１）または（２）記載の信号
灯の故障検出装置において、前記表示用ＬＥＤと前記モ
ニタ用ＬＥＤは同一環境に配置する信号灯の故障検出装
置。(3) In the signal light failure detection device according to the above (1) or (2), the display LED and the monitor LED are arranged in the same environment.
【００１４】（４）前記（１）または（２）記載の信号
灯の故障検出装置において、前記信号灯の故障は、前記
表示用ＬＥＤのオープン故障，寿命による発光量の低下
および前記モニタ用ＬＥＤのオープン故障，ショート故
障，寿命による発光量の低下である信号灯の故障検出装
置。(4) In the signal light failure detecting device according to the above (1) or (2), the failure of the signal light includes an open failure of the display LED, a decrease in light emission amount due to a lifetime, and an open of the monitor LED. A signal lamp failure detector that detects a failure, short-circuit failure, or a decrease in light emission due to life.
【００１５】[0015]
【発明の実施の形態】以下本発明の実施の形態をＬＥＤ
色灯信号機の実施例により詳しく説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to LEDs.
This will be described in more detail with reference to an embodiment of a color light signal.
【００１６】[0016]
【実施例】図１は、実施例である“ＬＥＤ色灯信号機”
の１灯分の回路図であり、図２は、表示用ＬＥＤ，モニ
タ用ＬＥＤの配置図である。FIG. 1 shows an embodiment of an "LED color light signal".
FIG. 2 is a layout diagram of a display LED and a monitor LED.
【００１７】図１において、１は灯器に直流電源を供給
する整流器である。２は表示用ＬＥＤ、３はモニタ用Ｌ
ＥＤ、４は電流制限抵抗であり、所要数の表示用ＬＥＤ
２と１個のモニタ用ＬＥＤ３と電流制限抵抗４は直列回
路を構成し、整流器１の出力端に接続されている。In FIG. 1, reference numeral 1 denotes a rectifier for supplying DC power to a lamp. 2 is a display LED, 3 is a monitor L
ED, 4 are current limiting resistors, and required number of display LEDs
2, one monitor LED 3 and a current limiting resistor 4 constitute a series circuit, and are connected to the output terminal of the rectifier 1.
【００１８】モニタ用ＬＥＤ３に対して、フォトダイオ
ード５が対向配置され、フォトカプラ６が構成されてい
る。７は電流−電圧変換回路を構成するオペアンプ、８
はコンパレータを構成するオペアンプである。A photodiode 5 is arranged to face the monitor LED 3, and a photocoupler 6 is formed. 7 is an operational amplifier constituting a current-voltage conversion circuit;
Is an operational amplifier constituting a comparator.
【００１９】整流器１の出力端には、更に前述の直列回
路と同一構成の直列回路が所要数接続されている。そし
てこれらの直列回路にも５〜８等からなる回路９と同一
構成の回路１０，１１……が接続されている。The output terminal of the rectifier 1 is further connected to a required number of series circuits having the same configuration as the above-described series circuit. Circuits 10, 11,... Having the same configuration as the circuit 9 including 5 to 8 are connected to these series circuits.
【００２０】１２は警報リレー、１２−１は外部に警報
を出力する警報出力である。１３は多入力アンドゲート
であり、その各入力端には、回路９，１０，１１……の
出力が接続され、その出力端には、警報リレー１２の一
端が接続されている。警報リレー２の他端は整流器１の
出力端に接続されている。Reference numeral 12 denotes an alarm relay, and 12-1 denotes an alarm output for outputting an alarm to the outside. Reference numeral 13 denotes a multi-input AND gate, the input terminals of which are connected to the outputs of the circuits 9, 10, 11,..., And the output terminal of which is connected to one end of the alarm relay 12. The other end of the alarm relay 2 is connected to the output terminal of the rectifier 1.
【００２１】直列回路を形成する表示用ＬＥＤとモニタ
用ＬＥＤは、同一製造ロット（もちろん同一種類）のも
のであり、図２に示すように、同一の基板１４上に配置
され、実質上同一環境におかれている。The display LED and the monitor LED forming the series circuit are of the same production lot (of the same type), and are arranged on the same substrate 14 as shown in FIG. Have been placed.
【００２２】次に動作を説明する。Next, the operation will be described.
【００２３】各直列回路のモニタ用ＬＥＤ３は、各直列
回路の表示用ＬＥＤ２およびモニタ用ＬＥＤ３の状態に
応じた発光量（発光の強さ）で発光する。この発光量に
比例したフォトダイオード５の出力電流は、オペアンプ
７により電流に比例した電圧出力に変換された後段のコ
ンパレータ８の−入力端に入力されている。コンパレー
タ８の＋入力端には、抵抗８−１，８−２からなる抵抗
分圧器の分圧出力すなわち基準電圧が入力される。The monitor LED 3 of each series circuit emits light with a light emission amount (light emission intensity) according to the state of the display LED 2 and the monitor LED 3 of each series circuit. The output current of the photodiode 5 proportional to the light emission amount is input to the negative input terminal of the comparator 8 at the subsequent stage after being converted into a voltage output proportional to the current by the operational amplifier 7. To the + input terminal of the comparator 8, the divided output of the resistor voltage divider composed of the resistors 8-1 and 8-2, that is, the reference voltage is input.
【００２４】各直列回路の表示用ＬＥＤ２，モニタ用Ｌ
ＥＤ３が全て正常な場合は、オペアンプ７の出力電圧
は、前記基準電圧より大きく、オペアンプ８はローレベ
ルをゲート１３の各入力端に出力する。よってゲート１
３の出力はローレベルにあり、警報リレー１２は付勢さ
れ、警報出力のメーク接点は閉じている。Display LED 2 for each series circuit, monitor L
When all the EDs 3 are normal, the output voltage of the operational amplifier 7 is higher than the reference voltage, and the operational amplifier 8 outputs a low level to each input terminal of the gate 13. Therefore Gate 1
The output of 3 is at a low level, the alarm relay 12 is energized, and the make contact of the alarm output is closed.
【００２５】表示用ＬＥＤ２のいずれかがオープン故障
すると、その故障した表示用ＬＥＤ２に接続されたモニ
タ用ＬＥＤ３の発光量が零となり、そのモニタ用ＬＥＤ
２の発光量を検出するオペアンプ７の出力レベルが前記
基準電圧より低下し、オペアンプ８の出力は反転しハイ
レベルをゲート１３に出力する。よってゲート１３の出
力はローレベルからハイレベルに反転し、警報リレー１
２はオフとなり、警報出力のメーク接点が開き、外部に
警報が発せられる。When any one of the display LEDs 2 has an open failure, the amount of light emitted from the monitor LED 3 connected to the failed display LED 2 becomes zero, and the monitor LED 3
The output level of the operational amplifier 7 that detects the light emission amount of the second amplifier 2 drops below the reference voltage, the output of the operational amplifier 8 is inverted, and a high level is output to the gate 13. Therefore, the output of the gate 13 is inverted from low level to high level, and the alarm relay 1
2 is turned off, the make contact of the alarm output is opened, and an alarm is issued outside.
【００２６】モニタ用ＬＥＤ３のいずれかがオープン故
障，ショート故障した場合も、モニタ用ＬＥＤの発光量
が零となり、前述の表示用ＬＥＤ２のオープン故障の場
合と同様に動作し、外部に警報が発せられる。If any one of the monitor LEDs 3 has an open fault or short-circuit fault, the amount of light emitted from the monitor LEDs becomes zero, the same operation as in the case of the above-mentioned open fault of the display LED 2 occurs, and an alarm is issued to the outside. Can be
【００２７】モニタ用ＬＥＤ３の発光量が寿命により低
下し、オペアンプ７の出力が前記基準電圧以下となった
場合も、ゲート１３の出力はローレベルからハイレベル
に反転し、外部に警報が発せられる。When the amount of light emitted from the monitoring LED 3 is reduced due to its life, and the output of the operational amplifier 7 becomes lower than the reference voltage, the output of the gate 13 is inverted from low level to high level, and an alarm is issued to the outside. .
【００２８】前述のように、直列回路を形成する表示用
ＬＥＤとモニタ用ＬＥＤは、同一製造ロットのもので、
実質上同一環境におかれているので、寿命はほぼ同じと
考えることができ、モニタ用ＬＥＤの寿命により表示用
ＬＥＤの寿命を推定できる。As described above, the display LED and the monitor LED forming the series circuit are of the same production lot.
Since they are in substantially the same environment, the lifespan can be considered to be substantially the same, and the lifespan of the display LED can be estimated from the lifespan of the monitor LED.
【００２９】よって、従来検出できなかった表示用ＬＥ
Ｄの寿命による発光量低下が、間接的にではあるが、モ
ニタ用ＬＥＤの寿命による発光量の低下により検出で
き、事前保守に役立てることができる。Therefore, the display LE which cannot be detected conventionally.
The decrease in the light emission due to the life of D can be detected, though indirectly, by the decrease in the light emission due to the life of the monitor LED, and can be used for advance maintenance.
【００３０】更に、モニタ用ＬＥＤは、信号灯の故障検
出部の重要な部分であるが、そのオープン故障，ショー
ト故障，寿命による発光量の低下が前述のように検出す
ることができる。Further, the monitoring LED is an important part of the failure detection section of the signal lamp, and its open failure, short-circuit failure, and a decrease in the amount of light emission due to its life can be detected as described above.
【００３１】なお、この明細書では、“ＬＥＤの寿命に
よる発光量の低下”を“ＬＥＤの故障”に含めて説明し
ている。It should be noted that, in this specification, "decrease in the amount of light emission due to the life of the LED" is described as being included in "failure of the LED".
【００３２】[0032]
【発明の効果】以上説明したように、本発明によれば、
表示用ＬＥＤのオープン故障および寿命による発光量の
低下が検出できる信号灯の故障検出装置を提供すること
ができる。As described above, according to the present invention,
It is possible to provide a signal light failure detection device capable of detecting an open failure of a display LED and a decrease in the amount of light emission due to a lifetime.
【図１】 実施例の要部構成を示す図FIG. 1 is a diagram showing a configuration of a main part of an embodiment.
【図２】 表示用ＬＥＤ，モニタ用ＬＥＤの配置図FIG. 2 is a layout diagram of a display LED and a monitor LED.
２ 表示用ＬＥＤ ３ モニタ用ＬＥＤ ５ フォトダイオード 2 LED for display 3 LED for monitor 5 Photodiode
Claims (4)
製造ロットのモニタ用ＬＥＤとを直列接続した直列回路
と、前記モニタ用ＬＥＤの発光量を検出する検出手段
と、この検出手段で検出した発光量が所定値以下になっ
た場合に、信号灯故障を判定する判定手段とを備えたこ
とを特徴とする信号灯の故障検出装置。1. A series circuit in which a display LED and a monitor LED of the same production lot as the display LED are connected in series, detection means for detecting the amount of light emitted from the monitor LED, and detection by the detection means. A failure detecting device for a signal light, comprising: determining means for determining a signal light failure when a light emission amount becomes equal to or less than a predetermined value.
製造ロットのモニタ用ＬＥＤとを直列接続した直列回路
を複数並列接続した直並列回路と、この直並列回路にお
ける全モニタ用ＬＥＤの夫々の発光量を検出する検出手
段と、この検出手段で検出した前記夫々の発光量の少な
くとも一量が所定値以下になった場合に、信号灯故障を
判定する判定手段とを備えたことを特徴とする信号灯の
故障検出装置。2. A series-parallel circuit in which a plurality of series-connected serially-connected display LEDs and monitor LEDs of the same production lot as the display LEDs are connected to each other. Detecting means for detecting a light emission amount; and determining means for determining a signal lamp failure when at least one of the respective light emission amounts detected by the detection means becomes a predetermined value or less. Signal light failure detector.
故障検出装置において、前記表示用ＬＥＤと前記モニタ
用ＬＥＤは同一環境に配置することを特徴とする信号灯
の故障検出装置。3. The failure detecting device for a signal light according to claim 1, wherein the display LED and the monitor LED are arranged in the same environment.
故障検出装置において、前記信号灯の故障は、前記表示
用ＬＥＤのオープン故障，寿命による発光量の低下およ
び前記モニタ用ＬＥＤのオープン故障，ショート故障，
寿命による発光量の低下であることを特徴とする信号灯
の故障検出装置。4. The signal light failure detection device according to claim 1, wherein the failure of the signal light includes an open failure of the display LED, a decrease in a light emission amount due to a lifetime, and an open failure of the monitor LED. Short-circuit failure,
An apparatus for detecting a failure of a signal light, characterized in that the amount of light emission is reduced due to life.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10347021A JP2000172986A (en) | 1998-12-07 | 1998-12-07 | Fault detector of signal lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10347021A JP2000172986A (en) | 1998-12-07 | 1998-12-07 | Fault detector of signal lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000172986A true JP2000172986A (en) | 2000-06-23 |
Family
ID=18387391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10347021A Withdrawn JP2000172986A (en) | 1998-12-07 | 1998-12-07 | Fault detector of signal lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000172986A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6448716B1 (en) | 2000-08-17 | 2002-09-10 | Power Signal Technologies, Inc. | Solid state light with self diagnostics and predictive failure analysis mechanisms |
| GB2371689B (en) * | 2001-03-10 | 2003-07-16 | Siemens Plc | Electrical apparatus and method |
| JP2004006622A (en) * | 2001-12-20 | 2004-01-08 | Osram Opto Semiconductors Gmbh | LED array and LED module |
| CZ297617B6 (en) * | 2005-12-28 | 2007-02-14 | Azd Praha S. R. O. | LED lamp and method for safe control of such LED lamp |
| US8111388B2 (en) | 2010-08-04 | 2012-02-07 | Oldenburg Group Incorporated | Luminous flux depreciation notification system for light fixtures incorporating light emitting diode sources |
| CN102890870A (en) * | 2012-10-30 | 2013-01-23 | 重庆交通大学 | Self diagnosis method and device for faults of traffic signal control machine |
| CN103996307A (en) * | 2014-05-11 | 2014-08-20 | 彭守斌 | Method for automatically monitoring operation of traffic signal lamps by crossing different signal controllers |
| JP2015021959A (en) * | 2013-07-22 | 2015-02-02 | 正雄 佐藤 | Combined circuit of three diodes |
| GB2566485A (en) * | 2017-09-14 | 2019-03-20 | Unipart Rail Ltd | Rail signal arrangement for a rail signalling system |
| DE102021203550A1 (en) | 2021-04-09 | 2022-10-13 | Siemens Aktiengesellschaft | Lighting device, emergency stop button and operating procedures |
| CN115273493A (en) * | 2022-05-16 | 2022-11-01 | 广西交科集团有限公司 | Interactive urban traffic intelligent control system and method |
| TWI850890B (en) * | 2022-06-06 | 2024-08-01 | 光林智能科技股份有限公司 | Traffic signal lamp, traffic signal system and lamp-state detection method using the same |
-
1998
- 1998-12-07 JP JP10347021A patent/JP2000172986A/en not_active Withdrawn
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002015145A3 (en) * | 2000-08-17 | 2003-01-16 | Power Signal Technologies Inc | Solid state light with self diagnostics and predictive failure analysis mechanisms |
| US6448716B1 (en) | 2000-08-17 | 2002-09-10 | Power Signal Technologies, Inc. | Solid state light with self diagnostics and predictive failure analysis mechanisms |
| GB2371689B (en) * | 2001-03-10 | 2003-07-16 | Siemens Plc | Electrical apparatus and method |
| JP2004006622A (en) * | 2001-12-20 | 2004-01-08 | Osram Opto Semiconductors Gmbh | LED array and LED module |
| CZ297617B6 (en) * | 2005-12-28 | 2007-02-14 | Azd Praha S. R. O. | LED lamp and method for safe control of such LED lamp |
| US8111388B2 (en) | 2010-08-04 | 2012-02-07 | Oldenburg Group Incorporated | Luminous flux depreciation notification system for light fixtures incorporating light emitting diode sources |
| CN102890870A (en) * | 2012-10-30 | 2013-01-23 | 重庆交通大学 | Self diagnosis method and device for faults of traffic signal control machine |
| CN102890870B (en) * | 2012-10-30 | 2014-06-11 | 重庆交通大学 | Self diagnosis method and device for faults of traffic signal control machine |
| JP2015021959A (en) * | 2013-07-22 | 2015-02-02 | 正雄 佐藤 | Combined circuit of three diodes |
| CN103996307A (en) * | 2014-05-11 | 2014-08-20 | 彭守斌 | Method for automatically monitoring operation of traffic signal lamps by crossing different signal controllers |
| 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 |
| DE102021203550A1 (en) | 2021-04-09 | 2022-10-13 | Siemens Aktiengesellschaft | Lighting device, emergency stop button and operating procedures |
| CN115273493A (en) * | 2022-05-16 | 2022-11-01 | 广西交科集团有限公司 | Interactive urban traffic intelligent control system and method |
| CN115273493B (en) * | 2022-05-16 | 2024-03-19 | 广西交科集团有限公司 | Interactive urban traffic intelligent control system and method |
| TWI850890B (en) * | 2022-06-06 | 2024-08-01 | 光林智能科技股份有限公司 | Traffic signal lamp, traffic signal system and lamp-state detection method using the same |
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| A300 | Withdrawal of application because of no request for examination |
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