CN101796556A - Determining proportion of faulty leds in a traffic light display - Google Patents

Determining proportion of faulty leds in a traffic light display Download PDF

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Publication number
CN101796556A
CN101796556A CN200880022706A CN200880022706A CN101796556A CN 101796556 A CN101796556 A CN 101796556A CN 200880022706 A CN200880022706 A CN 200880022706A CN 200880022706 A CN200880022706 A CN 200880022706A CN 101796556 A CN101796556 A CN 101796556A
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CN
China
Prior art keywords
led
ratio
display lamp
threshold value
fault
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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.)
Pending
Application number
CN200880022706A
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Chinese (zh)
Inventor
马尔科姆·杨
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ALDRIDGE TRAFFIC SYSTEMS
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ALDRIDGE TRAFFIC SYSTEMS
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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 CN101796556A publication Critical patent/CN101796556A/en
Pending legal-status Critical Current

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    • 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]

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

Abstract

A method for determining a proportion of LEDs with open circuit failures in an array of LEDs in a traffic light display, the array of LEDs being arranged as a plurality of sections in parallel and in which each section includes a pair of LEDs in series, the method comprising the steps of:- (a) providing a fault sensing resistor which connects between each pair of LEDs in series and a common sensing point, (b) feeding a sensing signal of a predetermined frequency to the common sensing point, (c) providing a differential amplifier which connects to both the common sensing point and to a voltage divider circuit in series with the common sensing point, wherein the potential difference between the common sensing point and the voltage divider circuit is dependent on the proportion of LEDs in the array having open circuit failures, the potential difference being converted to a signal for determining the proportion of LEDs with open circuit failures by the differential amplifier.

Description

Determine the ratio of the light emitting diode that breaks down in the traffic display lamp
Technical field
The present invention relates to be used for to determine the method and apparatus of the ratio of the out of order light emitting diode (below be referred to as " LED ") in traffic display lamp or the signal lamp.
Background technology
In the use of LED in the traffic display lamp, know that fault has taken place the LED that whether has greater than special ratios is useful in display lamp.Experience shows that open circuit fault is the LED fault of common type.
Know the LED that has surpassed the ratio that allows in the display lamp fault has taken place, just can make traffic control equipment close out of order display lamp, next this traffic display lamp is keeped in repair.
About application of the present invention, although will describe preferred implementation of the present invention in the instructions later, determine to be arranged as a ratio of arranging the LED that has open circuit fault among the LED of a plurality of unit that are parallel to each other, wherein each unit comprises 2 LED coupled in series, but for a person skilled in the art, the present invention is not limited thereto obviously,, but may be used on the fault of other type and other led array, have wideer range of application.
Summary of the invention
Therefore, the purpose of this invention is to provide simply a kind of and be used for determining having the ratio method of the LED that breaks down in the traffic display lamp of a plurality of LED reliably, especially, be the method for the ratio of the LED that has open circuit fault among the row LED who determines to be connected in the traffic display lamp of traffic control equipment.
Another object of the present invention provides a kind of simple and reliable method of controlling the running status of the traffic display lamp with a plurality of LED.
According to an aspect of the present invention, provide the device of the ratio of the LED that breaks down in a kind of traffic display lamp that is used for determining having a plurality of LED, this device comprises:
(a) will exist the information of one or more fault LED to be sent to the device of public sensing points;
(b) provide the device of signal to this public sensing points, with this one or more fault LED of sensing; And
(c) device of the signal of this one or more LED that breaks down of processing expression is to determine the ratio of the fault LED in this traffic display lamp.
Preferably, described treating apparatus comprises the threshold value device that just has been activated when the ratio of the LED that breaks down has surpassed the ratio that is allowed.
Preferably this device further comprises and is used for informing to traffic control equipment the device of the information that described threshold value device is activated.
When described threshold value device was activated, described traffic control equipment can be closed this traffic display lamp.
In a preferred form, this treating apparatus comprises the differential amplifier of the bleeder circuit that is connected to described public sensing points simultaneously and is connected in series with this public sensing points, wherein, potential difference (PD) between this public sensing points and this bleeder circuit depends on the ratio of the LED that breaks down in the traffic display lamp, and described potential difference (PD) is converted into the signal of the ratio of the LED that represents the fault in this traffic display lamp.
According to a further aspect in the invention, provide a kind of device that is used for controlling the running status of the traffic display lamp with a plurality of LED, this device comprises:
(a) comprise the traffic display lamp of equipment described above;
(b) traffic control equipment;
(c) be used for informing the device of information of the ratio of the fault LED in this traffic display lamp, so that when the ratio of the LED that breaks down surpasses the ratio that allows, activate this threshold value device and close this traffic display lamp to this traffic control equipment.
According to further aspect of the present invention, the method of the ratio of a kind of LED that is used for determining taking place among the row LED in the traffic display lamp open circuit fault is provided, this row LED is arranged as a plurality of unit that are parallel to each other, wherein each unit comprises the pair of LEDs that is connected in series mutually, and the method comprising the steps of:
(a) provide the fault detect resistance that is connected between every pair of mutual LED coupled in series and the public sensing points;
(b) sensing signal with preset frequency offers this public sensing points;
(c) provide the differential amplifier of the bleeder circuit that is connected to this public sensing points simultaneously and is connected in series with this public sensing points, wherein the potential difference (PD) between this public sensing points and this bleeder circuit depends on the ratio of the LED of this LED generation open circuit fault in arranging, and this potential difference (PD) is converted to the signal of the ratio of the LED that is used for determining taking place open circuit fault by this differential amplifier.
Preferably, if the ratio of the LED of the generation open circuit fault that is determined is greater than the ratio that is allowed, then this method also further comprises step:
(d) will offer rectifier and wave filter from the signal of differential amplifier;
(e) provide the threshold value device that receives rectified and filtered signal,, activate this threshold value device when among this row LED during greater than the LED generation open circuit fault of the ratio that is allowed; And
(f) provide to it and inform the traffic control equipment that this threshold value device is activated.
According to further aspect of the present invention, a kind of method that is used for controlling the running status of the traffic display lamp with a row LED is provided, this row LED is arranged as a plurality of unit that are parallel to each other, and wherein each unit comprises the pair of LEDs that is connected in series mutually, and the method comprising the steps of:
(a) determine the ratio of the LED of the generation open circuit fault among this row LED in this traffic display lamp according to the step in the method described above (a) to (c);
(b) signal that will represent this ratio offers rectifier and wave filter;
(c) provide the threshold value device that receives rectified and filtered signal,, activate this threshold value device when among this row LED during greater than the LED generation open circuit fault of the ratio that is allowed, and
(d) provide to it and inform that described threshold value device is activated, and close the traffic control equipment of this traffic display lamp.
Description of drawings
In order to make the present invention can more easily be understood and drop into actual enforcement, will carry out reference to accompanying drawing now, wherein:
Fig. 1 is the square circuit diagram of expression according to the method and apparatus of better embodiment of the present invention.
Embodiment
As shown in Figure 1, each LED unit 12,14,16 is made up of the electric current limiting resistance that 2 LED are connected with selectable series connection with it.A plurality of fault detect resistance 18,20,22 are used to connect the mid point and the public sensing points A of each LED unit.Peak value is provided for an A corresponding to the square wave sensing signal of the 1kHZ that can realize easily of the total voltage that offers the LED unit by resistance B.Differential amplifier C is connected to an A and is positioned at the bleeder circuit at D place, and when all LED normally moved, the potential difference (PD) between A and the D was very little.Form a kind of bridge circuit like this, the characteristics of bridge circuit are exactly, and when the bridge balance, it is output as minimum (being approximately 0), if this bridge imbalance, then the output at E place will increase.
In circuit structure shown in Figure 1, be directly proportional with the quantity of LED unit with the LED that opens circuit about the degree of unbalancedness of this bridge.Amplifier C is output as the square wave of 1kHZ, and its amplitude is directly proportional with the quantity of the LED unit that has open circuit fault LED.Be imported into rectifier F and wave filter G from the square wave of C output, be imported into then and have only the threshold value device H that when the LED unit that surpasses selected ratio breaks down, just is activated.The output of threshold value device H is used to inform that to traffic control equipment fault may appear in monitored signal lamp.The output of H also can be used for closing the out of order signal lamp.
Although be considered to the most practical and for preferred embodiment in the present invention of this explanation and description, but can change within the scope of the invention, be not confined to this detailed description, but consistent with the four corner of appending claims, to comprise any and all equivalent apparatus and device.

Claims (9)

1. the device of the ratio of the LED that breaks down in the traffic display lamp that is used for determining having a plurality of LED, this device comprises:
(a) will exist the information of one or more fault LED to be sent to the device of public sensing points;
(b) provide the device of signal to this public sensing points, with this one or more fault LED of sensing;
And
(c) device of the signal of this one or more LED that breaks down of processing expression is to determine the ratio of the fault LED in this traffic display lamp.
2. according to the device of claim 1, wherein said treating apparatus comprises the threshold value device that just has been activated when the ratio of the LED that breaks down has surpassed the ratio that is allowed.
3. according to the device of claim 2, further comprise being used for informing the device of the information that described threshold value device is activated to traffic control equipment.
4. according to the device of claim 3, wherein when described threshold value device was activated, described traffic control equipment was closed this traffic display lamp.
5. according to the device of claim 1, wherein said treating apparatus comprises the differential amplifier of the bleeder circuit that is connected to described public sensing points simultaneously and is connected in series with this public sensing points, wherein, potential difference (PD) between this public sensing points and this bleeder circuit depends on the ratio of the LED that breaks down in the traffic display lamp, and described potential difference (PD) is converted into the signal of the ratio of the LED that breaks down in this traffic display lamp of expression.
6. device that is used for controlling the running status of traffic display lamp with a plurality of LED, this device comprises:
(a) comprise the traffic display lamp of the described device of claim 2;
(b) traffic control equipment, and
(c) be used for informing the device of information of the ratio of the fault LED in this traffic display lamp, so that when the ratio of the LED that breaks down surpasses the ratio that allows, activate this threshold value device and close this traffic display lamp to this traffic control equipment.
7. the method for the ratio of a LED who is used for determining the generation open circuit fault among the row LED in the traffic display lamp, this row LED is arranged as a plurality of unit that are parallel to each other, and wherein each unit comprises the pair of LEDs that is connected in series, and the method comprising the steps of:
(a) provide the fault detect resistance that is connected between every pair of mutual LED coupled in series and the public sensing points;
(b) sensing signal with preset frequency offers this public sensing points;
(c) provide the differential amplifier of the bleeder circuit that is connected to this public sensing points simultaneously and is connected in series with this public sensing points, wherein the potential difference (PD) between this public sensing points and this bleeder circuit depends on the ratio of the LED of this LED generation open circuit fault in arranging, and this potential difference (PD) is converted to the signal of the ratio of the LED that is used for determining taking place open circuit fault by this differential amplifier.
8. according to the method for claim 7, wherein if the ratio of the LED of the generation open circuit fault that is determined greater than the ratio that is allowed, then this method also further comprises step:
(d) will offer rectifier and wave filter from the signal of described differential amplifier,
(e) provide the threshold value device that receives rectified and filtered signal,, activate this threshold value device when among this row LED during greater than the LED generation open circuit fault of the ratio that is allowed, and
(f) provide to it and inform the traffic control equipment that this threshold value device is activated.
9. method of running status that is used for controlling traffic display lamp with a row LED, this row LED is arranged as the multiple-unit that is parallel to each other, and wherein each unit comprises the pair of LEDs that is connected in series mutually, and the method comprising the steps of:
(a) step (a) to (c) in the method according to claim 7 is determined the ratio of the LED of the generation open circuit fault among this row LED in this traffic display lamp;
(b) signal that will represent this ratio offers rectifier and wave filter;
(c) provide the threshold value device that receives rectified and filtered signal,, activate this threshold value device when among this row LED during greater than the LED generation open circuit fault of the ratio that is allowed, and
(d) provide to it and inform that described threshold value device is activated, and close the traffic control equipment of this traffic display lamp.
CN200880022706A 2007-05-22 2008-05-22 Determining proportion of faulty leds in a traffic light display Pending CN101796556A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AU2007902743 2007-05-22
AU2007902743A AU2007902743A0 (en) 2007-05-22 Method and apparatus for determining the proportion of faulty light emitting diodes in a traffic light display
PCT/AU2008/000712 WO2008141384A1 (en) 2007-05-22 2008-05-22 Determining proportion of faulty leds in a traffic light display

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Publication Number Publication Date
CN101796556A true CN101796556A (en) 2010-08-04

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

Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN101944276A (en) * 2010-08-19 2011-01-12 深圳市中庆微科技开发有限公司 LED screen dead pixel monitoring and early warning 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

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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
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

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101944276A (en) * 2010-08-19 2011-01-12 深圳市中庆微科技开发有限公司 LED screen dead pixel monitoring and early warning method and 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

Also Published As

Publication number Publication date
WO2008141384A9 (en) 2010-11-25
EP2149130A1 (en) 2010-02-03
AU2008253601A1 (en) 2008-11-27
ZA200906703B (en) 2010-06-30
NZ617222A (en) 2014-07-25
WO2008141384A1 (en) 2008-11-27
AU2008253601B2 (en) 2013-11-28

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Application publication date: 20100804