WO2009070828A9 - An led driver method for traffic lanterns - Google Patents
An led driver method for traffic lanterns Download PDFInfo
- Publication number
- WO2009070828A9 WO2009070828A9 PCT/AU2008/001778 AU2008001778W WO2009070828A9 WO 2009070828 A9 WO2009070828 A9 WO 2009070828A9 AU 2008001778 W AU2008001778 W AU 2008001778W WO 2009070828 A9 WO2009070828 A9 WO 2009070828A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- led
- voltage
- output
- fault
- led driver
- Prior art date
Links
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
Definitions
- the present invention relates to a light emitting diode (LED) driver method and apparatus for traffic lanterns.
- LED light emitting diode
- LEDs light emitting diodes
- This invention addresses the need to control the current in the LEDs and to discover the failed proportion.
- an LED driver for a traffic lantern comprising a current mirror adapted to control the current through an LED of the lantern, a fault detector arrangement connected to an output of the current mirror and the LED and adapted to indicate a fault condition if the voltage measured is outside a predetermined range, and a voltage sensor arrangement adapted to provide an output voltage proportional to the average voltage of other LED drivers for the lantern which are not connected to faulty LEDs.
- the fault detector monitors the output voltage of the current mirror and produces first and second outputs, the first output being fed to a fault circuit in which the first output is combined with the first outputs from a plurality of other LED drivers and then compared, and the second output being fed to the voltage sensor arrangement, and wherein the voltage sensor arrangement is also fed an output voltage of the LED.
- the output voltage of the voltage sensor arrangement is equal to the LED output voltage when a fault is absent and is equal to an open circuit when a fault is present.
- the output voltage of the voltage sensor arrangement is fed to a voltage controller comprising a combining circuit and thence an LED power supply.
- the LED driver consists of a current mirror to control the current through the LED, a fault detector arrangement and a driver voltage sensor arrangement.
- the current mirror can usefully have a current ratio of about 20, meaning that a current into the control terminal of say 1mA will result in a current in the output of 2OmA.
- the fault detector arrangement is connected to the output of the current mirror and the driven LED or LEDs and indicates a fault condition if the voltage measured is too low (indicating an open circuit LED) or too high (indicating a short circuit LED).
- the voltage sensor arrangement provides an output voltage (or current) proportional to the average voltage of those LED drivers which are not connected to faulty LEDs. In excluding the LEDs with faults, the output of the fault detectors may be used.
- the driver voltage sensor arrangement is used to adjust or control the voltage applied to the LEDs so that enough voltage is present to operate the LEDs and the other systems but no excess voltage is used as this would cause excessive power loss in the current mirrors.
- the fault detector arrangement is used to either report the proportion of faulty LEDs via some communications devices or to disconnect the traffic lantern, thus causing a measurable change in consumed power.
- the LED driver apparatus and method are now described in greater detail by reference to Fig.1.
- the LED current control input at 12 is fed to current mirror 14, the output 16 of which feeds power to LED 18.
- the fault detector 20 monitors the output voltage as described above and produces two outputs.
- the output at 22 is fed to a fault circuit comprising a combining circuit and thence a fault level comparator (not shown).
- the combining circuit combines the outputs from a plurality of similar LED drivers. It is to be understood that Fig. 1 shows only one of many similar LED drivers that are used together.
- the fault detector output at 24 is fed to voltage sensor (or monitor) 26.
- the voltage sensor 26 also monitors the LED voltage via connection 28.
- the voltage sensor output at 30 is a simple function of the LED voltage while the fault detector 20 indicates correct operation of the LED and is some other useful value at other times.
- the output of the voltage sensor 26 could be equal to the LED voltage when a fault is absent and an open circuit when a fault is present. This allows the output of the voltage sensor 26 to be indicative of only the correctly functioning LEDs.
- the output 30 is fed to a voltage controller comprising a combining circuit and thence the LED power supply (not shown).
- the LED power supply uses the combined voltage sensors to set its own voltage to work efficiently.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Traffic Control Systems (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2008801189367A CN101896951A (en) | 2007-12-03 | 2008-12-03 | An LED driver method for traffic lanterns |
NZ586130A NZ586130A (en) | 2007-12-03 | 2008-12-03 | An led driver method for traffic lanterns |
EP08856603A EP2229667A1 (en) | 2007-12-03 | 2008-12-03 | An led driver method for traffic lanterns |
AU2008331420A AU2008331420B2 (en) | 2007-12-03 | 2008-12-03 | An LED driver method for traffic lanterns |
ZA2010/04263A ZA201004263B (en) | 2007-12-03 | 2010-06-15 | An led driver method for traffic lanterns |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2007906653 | 2007-12-03 | ||
AU2007906653A AU2007906653A0 (en) | 2007-12-03 | An LED driver method for traffic lanterns |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2009070828A1 WO2009070828A1 (en) | 2009-06-11 |
WO2009070828A9 true WO2009070828A9 (en) | 2010-11-25 |
Family
ID=40717186
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2008/001778 WO2009070828A1 (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) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
US9524641B2 (en) * | 2011-03-22 | 2016-12-20 | GE Lighting Solutions, LLC | LED traffic signal fault logging system and method |
CN102956110B (en) * | 2011-08-19 | 2014-12-10 | 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 |
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 NZ NZ586130A patent/NZ586130A/en active IP Right Revival
- 2008-12-03 CN CN2008801189367A patent/CN101896951A/en active Pending
- 2008-12-03 EP EP08856603A patent/EP2229667A1/en not_active Withdrawn
- 2008-12-03 WO PCT/AU2008/001778 patent/WO2009070828A1/en active Application Filing
- 2008-12-03 AU AU2008331420A patent/AU2008331420B2/en active Active
-
2010
- 2010-06-15 ZA ZA2010/04263A patent/ZA201004263B/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO2009070828A1 (en) | 2009-06-11 |
AU2008331420B2 (en) | 2013-10-24 |
EP2229667A1 (en) | 2010-09-22 |
AU2008331420A1 (en) | 2009-06-11 |
NZ586130A (en) | 2013-10-25 |
CN101896951A (en) | 2010-11-24 |
ZA201004263B (en) | 2011-04-28 |
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