CN101896951A - An LED driver method for traffic lanterns - Google Patents
An LED driver method for traffic lanterns Download PDFInfo
- Publication number
- CN101896951A CN101896951A CN2008801189367A CN200880118936A CN101896951A CN 101896951 A CN101896951 A CN 101896951A CN 2008801189367 A CN2008801189367 A CN 2008801189367A CN 200880118936 A CN200880118936 A CN 200880118936A CN 101896951 A CN101896951 A CN 101896951A
- Authority
- CN
- China
- Prior art keywords
- voltage
- led
- output
- sensor device
- current mirror
- 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.)
- Pending
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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
- H05B47/24—Circuit arrangements for protecting against overvoltage
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Traffic Control Systems (AREA)
Abstract
An LED driver for a traffic lantern has a current mirror (14) adapted to control the current through an LED (18) of the lantern, and a fault detector (20) connected to an output (16) of the current mirror (14) and the LED (18). The fault detector (20) is adapted to indicate a fault condition if the voltage measured is outside a predetermined range. The LED driver also has a voltage sensor (26) adapted to provide an output voltage (30) proportional to the average voltage of other LED drivers for the lantern which are not connected to faulty LEDs.
Description
Technical field
The present invention relates to light emitting diode (LED) driving method and the equipment that is used for traffic lights.
Background technology
In the use of the light emitting diode in traffic lights (LED), knowing has the light emitting diode of how many ratios fault to occur, and to send signal to traffic control equipment when the light emitting diode that surpasses selected ratio breaks down be useful.
Summary of the invention
The present invention is absorbed in the needs of the electric current in the control light emitting diode and the ratio that demonstration is broken down.
According to the present invention, a kind of led driver that is used for traffic lights is provided, comprise: be applicable to the current mirror of control by the electric current of the LED of signal lamp, be connected to the output of described current mirror and be applicable to the fault detect apparatus of indicating fault status when survey voltage exceeds preset range, and the voltage sensor device that provides with the proportional output voltage of average voltage of the driver of other LED that is not connected to fault LED of signal lamp is provided.
Preferably, the output voltage of described fault detector monitoring current mirror also produces first and second outputs, first output is provided for faulty circuit, and therein this first output and first output of a plurality of led drivers from other are combined then and compared, second output is provided for described voltage sensor device, and the output voltage of LED is provided to this voltage sensor device.
Preferably, when not breaking down, the output voltage of voltage sensor device equates that with the output voltage of LED when breaking down, the output voltage of voltage sensor device equals open circuit voltage.
Preferably form is, the output voltage of described voltage sensor device is provided for voltage controller, and this voltage controller comprises combinational circuit and LED power supply.
Description of drawings
In order more easily to understand and to implement the present invention, with reference to the block scheme (Fig. 1) of following led driver according to preferred implementation of the present invention.
Embodiment
Put it briefly, led driver comprises current mirror, fault detect apparatus and the actuator voltage sensor device that is used for controlling by the electric current of LED.
Current mirror can have effectively and is approximately 20 current ratio, also just means that the electric current of supposing 1mA enters control end, will produce the electric current of 20mA at output terminal.
The fault detect apparatus is connected to output terminal and driven single or a plurality of light emitting diode (LED or LEDs) of current mirror, if measured brownout (show and exist LED to open circuit) or too high (show and have the LED short circuit), take place with regard to indicating fault status.
Voltage sensor device provides the proportional output voltage of average voltage (perhaps electric current) that is not connected to the led driver of out of order LED with those.In getting rid of out of order LED process, the output that may use fault detector.
In service with combining of other subsystem, can be according to following application the present invention.The actuator voltage sensor device is used to adjust or control the voltage that is applied to light emitting diode, move light emitting diode and other system to give sufficient voltage, but superpotential can not appear, because superpotential can cause the excessive energy loss in the current mirror.The fault detect apparatus is used to the ratio by some transmission equipment report fault light emitting diodes, perhaps is used to disconnect traffic lights, thus the measurable variation in the electric energy that obtains being consumed.
Illustrate in greater detail led driver device and driving method now with reference to Fig. 1.LED Current Control input 12 is provided for current mirror 14, and the output 16 of current mirror provides electric energy to LED 18.Fault detector 20 is monitored output voltage as described above and is produced two-way output.Output 22 is provided for the faulty circuit that comprises combinational circuit and fault level comparator (not shown).Combinational circuit is combined the output of a plurality of similar led drivers.Should be understood that Fig. 1 only shows in many similar led drivers that use that combine.The output 24 of fault detector is provided for voltage sensor (perhaps monitor) 26.Voltage sensor 26 is also by connecting line 28 monitoring LED voltages.When fault detector 20 indication LED true(-)runnings, the output 30 of voltage sensor is the simple function of LED voltage, and is being certain other useful value At All Other Times.Typically, when not breaking down, the output of voltage sensor 26 equates with LED voltage, and when breaking down, then is equal to open circuit voltage.The output that allows voltage sensor 26 like this is the light emitting diode of indicating correct operation only.Output 30 is provided for the voltage controller that comprises combinational circuit and LED power supply (not shown).The voltage sensor of LED power utilization combination is set himself voltage, with operation effectively.
In not breaking away from boundary of the present invention and scope, can make multiple correction about the details of design of the present invention and configuration.
Claims (5)
1. led driver that is used for traffic lights, comprise: be applicable to the current mirror of control by the electric current of the LED of signal lamp, be connected to the output of described current mirror and be applicable to the fault detect apparatus of indicating fault status when survey voltage exceeds preset range, and the voltage sensor device that provides with the proportional output voltage of average voltage of the driver of other LED that is not connected to fault LED of signal lamp is provided.
2. according to the led driver of claim 1, the output voltage of wherein said fault detector monitoring current mirror also produces first and second outputs, first output is provided for faulty circuit, and therein this first output and first output of a plurality of led drivers from other are combined then and compared, second output is provided for described voltage sensor device, and the output voltage of LED is provided to this voltage sensor device.
3. according to the led driver of claim 2, wherein, when not breaking down, the output voltage of voltage sensor device equates that with the output voltage of LED when breaking down, the output voltage of voltage sensor device equals open circuit voltage.
4. according to the led driver of claim 3, the output voltage of wherein said voltage sensor device is provided for voltage controller, and this voltage controller comprises combinational circuit and LED power supply.
5. according to the led driver of claim 1, wherein said current mirror has and is approximately 20 current ratio.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2007906653 | 2007-12-03 | ||
| AU2007906653A AU2007906653A0 (en) | 2007-12-03 | An LED driver method for traffic lanterns | |
| PCT/AU2008/001778 WO2009070828A1 (en) | 2007-12-03 | 2008-12-03 | An led driver method for traffic lanterns |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101896951A true CN101896951A (en) | 2010-11-24 |
Family
ID=40717186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008801189367A Pending CN101896951A (en) | 2007-12-03 | 2008-12-03 | An LED driver method for traffic lanterns |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP2229667A1 (en) |
| CN (1) | CN101896951A (en) |
| AU (1) | AU2008331420B2 (en) |
| NZ (1) | NZ586130A (en) |
| WO (1) | WO2009070828A1 (en) |
| ZA (1) | ZA201004263B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102024340A (en) * | 2010-12-30 | 2011-04-20 | 广东大榕树信息科技有限公司 | Traffic light monitoring device and monitoring method thereof |
| CN102956110A (en) * | 2011-08-19 | 2013-03-06 | 中国长城计算机深圳股份有限公司 | LED traffic signal lamp and drive circuit thereof |
| CN103443836A (en) * | 2011-03-22 | 2013-12-11 | 通用电气照明解决方案有限责任公司 | LED traffic signal fault logging system and method |
| CN106304462A (en) * | 2016-07-26 | 2017-01-04 | 合肥联信电源有限公司 | A kind of emergency lighting lamp fault protection circuit |
| CN107633696A (en) * | 2017-09-18 | 2018-01-26 | 南昌金科交通科技股份有限公司 | A kind of system of Contrast tuned imaging traffic lights |
| CN112085957A (en) * | 2019-05-27 | 2020-12-15 | 云南金隆伟业电子有限公司 | Multifunctional traffic signal lamp |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2724749A1 (en) * | 1994-09-15 | 1996-03-22 | Sofrela Sa | LED lamps with integral controller for road traffic control signals |
| GB9708861D0 (en) * | 1997-04-30 | 1997-06-25 | Signal House Limited | Traffic signals |
| US6583731B2 (en) * | 2001-04-19 | 2003-06-24 | Singapore Technologies Electronics Ltd. | Fault detection for traffic light systems using electronic lighting elements |
-
2008
- 2008-12-03 CN CN2008801189367A patent/CN101896951A/en active Pending
- 2008-12-03 WO PCT/AU2008/001778 patent/WO2009070828A1/en active Application Filing
- 2008-12-03 EP EP08856603A patent/EP2229667A1/en not_active Withdrawn
- 2008-12-03 AU AU2008331420A patent/AU2008331420B2/en active Active
- 2008-12-03 NZ NZ586130A patent/NZ586130A/en active IP Right Revival
-
2010
- 2010-06-15 ZA ZA2010/04263A patent/ZA201004263B/en unknown
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102024340A (en) * | 2010-12-30 | 2011-04-20 | 广东大榕树信息科技有限公司 | Traffic light monitoring device and monitoring method thereof |
| CN102024340B (en) * | 2010-12-30 | 2013-06-26 | 广东大榕树信息科技有限公司 | Traffic light monitoring device and monitoring method thereof |
| CN103443836A (en) * | 2011-03-22 | 2013-12-11 | 通用电气照明解决方案有限责任公司 | LED traffic signal fault logging system and method |
| US9524641B2 (en) | 2011-03-22 | 2016-12-20 | GE Lighting Solutions, LLC | LED traffic signal fault logging system and method |
| CN102956110A (en) * | 2011-08-19 | 2013-03-06 | 中国长城计算机深圳股份有限公司 | LED traffic signal lamp and drive circuit thereof |
| CN106304462A (en) * | 2016-07-26 | 2017-01-04 | 合肥联信电源有限公司 | A kind of emergency lighting lamp fault protection circuit |
| CN107633696A (en) * | 2017-09-18 | 2018-01-26 | 南昌金科交通科技股份有限公司 | A kind of system of Contrast tuned imaging traffic lights |
| CN112085957A (en) * | 2019-05-27 | 2020-12-15 | 云南金隆伟业电子有限公司 | Multifunctional traffic signal lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2229667A1 (en) | 2010-09-22 |
| AU2008331420A1 (en) | 2009-06-11 |
| WO2009070828A9 (en) | 2010-11-25 |
| WO2009070828A1 (en) | 2009-06-11 |
| NZ586130A (en) | 2013-10-25 |
| ZA201004263B (en) | 2011-04-28 |
| AU2008331420B2 (en) | 2013-10-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20101124 |