EP1147687A1 - Method and device for remote monitoring of led lamps - Google Patents
Method and device for remote monitoring of led lampsInfo
- Publication number
- EP1147687A1 EP1147687A1 EP00979299A EP00979299A EP1147687A1 EP 1147687 A1 EP1147687 A1 EP 1147687A1 EP 00979299 A EP00979299 A EP 00979299A EP 00979299 A EP00979299 A EP 00979299A EP 1147687 A1 EP1147687 A1 EP 1147687A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- voltage
- current
- lines
- resistor
- capacitor
- 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
Links
- 238000012544 monitoring process Methods 0.000 title abstract description 10
- 238000000034 method Methods 0.000 title description 3
- 238000001514 detection method Methods 0.000 claims abstract description 27
- 239000003990 capacitor Substances 0.000 claims description 63
- 230000015556 catabolic process Effects 0.000 claims description 14
- 230000002950 deficient Effects 0.000 claims description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 230000002146 bilateral effect Effects 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000004065 semiconductor Substances 0.000 claims 14
- 230000001960 triggered effect Effects 0.000 claims 2
- 238000012795 verification Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 230000011664 signaling Effects 0.000 description 3
- 230000005669 field effect Effects 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
-
- 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]
-
- 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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
Definitions
- the present invention relates to the electric supply of light-emitting loads, in particular light-emitting diode (LED) lamps. More specifically, the present invention is concerned with electric circuits and methods required for remote monitoring of LED lamps.
- LED light-emitting diode
- LED lamps are becoming more and more popular in automotive traffic lights, railway signal lights and other applications. Their lower power consumption is an attractive feature, but the main reason for their popularity is their long life (100 000 hours) compared to standard incandescent lamps (5 000 hours). Manifestly, these features allow important reduction in maintenance costs.
- these lamps may be used, as those skilled in the art would know, for main line signalling and/or grade crossing signalling.
- Grade crossing signals are usually situated in populated areas such as road intersections. Remote monitoring of the LED lamps in grade crossing signals is therefore not necessary.
- Main line signals can be installed in remote areas, which are not easily accessible. Remote monitoring for checking the integrity of the lamps signals is therefore common practice.
- LED current is controlled by a power supply. Current characteristics are therefore not identical in a LED lamp and in an incandescent lamp.
- alternative current (ac) line voltage is rectified and then converted to a suitable level by a dc-dc
- the power supply it is possible for the power supply to continue drawing current at or near the nominal current value, even if the LED's are not emitting any light.
- the resulting characteristic is that a LED lamp will effectively light up when the power applied to it reaches a first high level while it will be turned off only when the power reaches a second lower level.
- the resulting problem is that if a certain power is induced by, for example, other nearby cables, the LED lamp could remain on while in fact it should be off. This could also lead to dangerous situations.
- LED lamps limit their widespread use in situations where they need to be remotely monitored such as in railway main line signalling applications.
- An object of the present invention is therefore to allow LED lamps to become compatible with remote detection systems designed for monitoring of incandescent lamps.
- Another object of the invention is to provide LED lamp circuitry which will emulate an incandescent lamp's behaviour upon remote monitoring of the LED lamp.
- Yet another object of the invention is to provide a control circuit for enabling/disabling the power supply to LED lamps in relation to the level of the line voltage.
- a fuse blow-out circuit for establishing a short circuit between first and second voltage and current supply lines to blow out a protection fuse through which a current supplied to a light-emitting load by the first and second lines flows, this fuse blow-out circuit comprises:
- timer means responsive to the voltage across the first and second lines for producing a time-representative signal after a certain period of time
- the current path is established and provides the short circuit between the first and second lines that will blow out the protection fuse and emulate an open circuit of a defective incandescent lamp.
- a fuse blow-out circuit for establishing a short circuit between first and second voltage and current supply lines to blow out a protection fuse through which a current supplied to a light-emitting load by the first and second lines flows.
- This fuse blow-out circuit comprises:
- - a resistor and a capacitor connected in series between the first and second lines, this resistor having a given resistance value, and this capacitor having a given capacitance value and a capacitor charge period dependent on the given resistance value and the given capacitance value; - a trigger circuit connected in parallel with the capacitor, and comprising a first controllable switch member closed in response to the current supplied to the light-emitting load to discharge the capacitor; and - a second controllable switch member defining a current path between the first and second lines and closed in response to a given voltage amplitude across the capacitor.
- the given voltage amplitude across the capacitor is reached to thereby close the second switch member, establish the current path and provide the short circuit between the first and second lines that will blow out the protection fuse and emulate an open circuit of a defective incandescent lamp.
- a power supply unit responsive to alternating voltage and current from an ac source for supplying a dc voltage and current to a light-emitting load, comprising: - a rectifier unit rectifying the alternating voltage and current from the ac source and supplying the rectified voltage and current to first and second voltage and current supply lines;
- - a protection fuse through which the alternating current from the ac source is supplied to the rectifier unit; - a converter of the rectified voltage and current into the dc voltage and current supplied to the light-emitting load;
- the present invention also relates to a cold filament detection circuit connected between first and second lines through which a voltage and current supply source supplies voltage and current to a light-emitting load, the voltage and current supply source having a set up time during which no current is supplied to the light-emitting load.
- This cold filament detection circuit comprises:
- the present invention further relates to a cold filament detection circuit connected between first and second lines through which a voltage and current supply source supplies voltage and current to a light-emitting load, the voltage and current supply source having a set up time during which no current is supplied to the light-emitting load.
- the cold filament detection circuit comprises: - a resistor;
- controllable switch member connected in series with the resistor between the first and second lines; responsive to the voltage on the first and second lines; and having a current-conductive junction established in response to the voltage on the first and second lines to thereby establish through the resistor a current path between the first and second lines;
- a switch control unit responsive to the current supplied to the light- emitting load, connected to the first controllable switch member, and having a switch-disabling circuit which prevents the current-conductive junction to establish as long as current is supplied to the light-emitting load.
- the switch-disabling circuit prevents the current-conductive junction to establish whereby the resistor is disconnected from between the first and second lines.
- the present invention still further relates to a voltage and current supply source responsive to alternating voltage and current from an ac source for supplying dc voltage and current to a light-emitting load, comprising:
- a rectifier unit rectifying the alternating voltage and current from the ac source and supplying the rectified voltage and current to first and second voltage and current supply lines;
- the present invention is also concerned with a voltage control circuit for controlling the amplitude of a voltage signal on a control terminal of a power controller unit itself controlling a voltage and current supply source which supplies a current to a light-emitting load through first and second voltage and current supply lines.
- This voltage control circuit comprises:
- first switch means connected in series with a high impedance element between the control terminal and one of the first and second lines, for establishing a high impedance current path between the control terminal and said one line when the first trigger voltage reaches a given amplitude
- the first switch means comprises means for producing a second trigger voltage having a first amplitude when the high impedance current path is not established and a second amplitude when the high impedance current path is established
- - second switch means connected in series with a low impedance element between the control terminal and said one line, for establishing a low impedance current path between the control terminal and said one line when the second trigger voltage has the first amplitude.
- the high impedance current path is not established, a second trigger voltage of first amplitude is produced, and the low impedance current path is established to result in a voltage signal amplitude on the control terminal which disables the power controller unit and, when the amplitude of the first trigger voltage reaches the given amplitude, the high impedance current path is established, a second trigger voltage of second amplitude is produced, and the low impedance current path is not established to result in a voltage signal amplitude on the control terminal which enables said power controller unit.
- the present invention is further concerned with a voltage control circuit for controlling the amplitude of a voltage signal on a control terminal of a power controller unit itself controlling a voltage and current supply source which supplies a current to a light-emitting load through first and second voltage and current supply lines.
- the voltage control circuit comprises:
- a voltage divider circuit connected between the first and second lines and comprising resistors which divide the voltage on the first and second lines to produce a first trigger voltage signal
- first controllable switch member connected in series with a high impedance element between the control terminal and one of the first and second lines to define a high impedance current path between this control terminal and said one line, this first controllable switch member being responsive to the first trigger voltage signal and having a first current- conductive junction established when the first trigger voltage reaches a given amplitude, wherein the high impedance current path produces a second trigger voltage having a first amplitude when the first current- conductive junction is not established and a second amplitude when the first current-conductive junction is established;
- a second controllable switch member connected in series with a low impedance element between the control terminal and said one line to define a low impedance current path between this control terminal and said one line, this second controllable switch member being responsive to the second trigger voltage and having a second current-conductive junction established when the second trigger voltage has the first amplitude and non established when the second trigger voltage signal has the second amplitude.
- the first current-conductive junction is not established to produce in the high impedance current path a second trigger voltage of first amplitude which establishes both the second current-conductive junction and the low impedance current path to result in a voltage signal amplitude on the control terminal which disables the power controller unit and, when the amplitude of the first trigger voltage reaches the given amplitude, both the first current-conductive junction and the high impedance current path are established to produce in the high impedance current path a second trigger voltage of second amplitude whereby both the second current-conductive junction and the low impedance current path are not established to result in a voltage signal amplitude on the control terminal which enables the power controller unit.
- the present invention is still further concerned with a voltage and current supply source responsive to alternating voltage and current from an ac source for supplying dc voltage and current to a light-emitting load, comprising: - a rectifier unit rectifying the alternating voltage and current from the ac source and supplying the rectified voltage and current to first and second voltage and current supply lines; - a converter of the rectified voltage and current into the dc voltage and current supplied to the light-emitting load;
- a power controller unit having a control terminal and controlling the converter in response to the rectified voltage on the first and second lines;
- the embodiments described herein present the advantage that they permit the use of LED lamps in applications, such as railway signal light applications, where there is a need for remote monitoring of the lamps, while keeping the advantageous features of lower power consumption and longer life.
- Figure 1 is a schematic block diagram showing a LED lamp assembly including a fuse blow-out circuit, a cold filament detection circuit, and a turn-off voltage circuit
- Figure 2A is a schematic electrical circuit diagram of a first embodiment of a fuse blow-out circuit according to the invention
- Figure 2B is a schematic electrical circuit diagram of a second embodiment of the fuse blow-out circuit according to the invention.
- Figure 3 is a schematic electrical circuit diagram of a cold filament detection circuit in accordance with the present invention.
- Figure 4 is a schematic electrical circuit diagram of a turn-off voltage circuit according to the present invention.
- an ac (alternating current) line voltage is supplied to a LED lamp 8 by a voltage and current supply source 10 through a line 11.
- the AC line voltage is EMI (Electromagnetic Interference) filtered and surge suppressed by means of functional block 12 including an EMI filter, a surge suppressor and an input fuse.
- the line voltage is rectified through a rectifier 14 and subsequently converted to a DC voltage through a DC-DC converter 20.
- the DC voltage from the converter 20 is supplied on line 21 to light up a series/parallel LED (light-emitting diodes) array 22.
- LEDs are also more generally referred to in the present specification as light-emitting loads.
- the current flowing through the series/parallel LED array 22 is sensed by a current sensor 100.
- This current sensor 100 produces a LED current sense signal 23 supplied to a power factor controller 28.
- the function of the power factor controller 28 is to control the DC-DC converter 20 through a line 27, which in turn controls the DC current and voltage on line 21.
- the series/parallel LED array 22 is formed of a plurality of subsets 26 of five (5) serially interconnected light-emitting diodes 24. Each subset 26 of serially interconnected light- emitting diodes 24 are connected in parallel to form the series/parallel LED array 22.
- a particularity is that the anodes of the first light-emitting diodes of the subsets 26 are interconnected, the cathodes the first light-emitting diodes of the subsets 26 and the anodes of the second light-emitting diodes of the subsets 26 are interconnected, the cathodes of the second light-emitting diodes of the subsets 26 and the anodes of the third light- emitting diodes of the subsets 26 are interconnected, the cathodes of the third light-emitting diodes of the subsets 26 and the anodes of fourth light- emitting diodes of the subsets 26 are interconnected, the cathodes of the fourth light-emitting diodes of the subsets 26 and the anodes of the fifth light-emitting diodes of the subsets 26 are interconnected, and the cathodes of the fifth light-emitting diodes of the subsets 26 are interconnected.
- other types of arrangements comprising various
- EMI filter block 12
- surge suppressor block 12
- input fuse block 12
- rectifier 14 DC-DC converter 20
- IC integrated circuit
- Figure 1 shows a fuse blow-out circuit 16, a cold filament detection circuit 18 and a turn-off voltage circuit 30. These circuits will be described in greater detail hereinafter.
- FIG. 2A a first embodiment of the fuse blow-out circuit is shown and generally designated by the reference 16.
- the fuse blow-out circuit 16 receives the rectified voltage from output terminal 15 of the rectifier 14 on an input 48.
- the fuse blow-out circuit 16 also comprises a second input 49 to receive the LED current sense signal 23 from the current sensor 100.
- a FET Field-Effect Transistor
- transistor 42 is turned off, capacitor 34 is being charged through resistor 31 and diode 32 from the voltage supplied on the input 48.
- capacitor 41 is being charged through resistor 31 , diode 32 and resistor 37.
- silicon bilateral switch (or triac) 38 turns on to supply a current to a trigger electrode 103 of a thyristor 39 to thereby trigger this thyristor 39. Triggering of the thyristor 39 into conduction creates a short-circuit between output terminal 15 of rectifier 14 (see Figures 1 and 2A) and a ground output terminal 101 of the same rectifier 14.
- This short-circuit will effectively blow out the input fuse of functional block 12, thereby opening the circuit. Detection of that open circuit will indicate that the lamp is defective thereby emulating the open circuit of a defective incandescent lamp.
- a LED current sense signal 23 is supplied to the input 49 prior to the end of the above mentioned given period of time, this LED current sense signal 23 is applied to the gate electrode 102 of FET transistor 42 through resistor 43 to turn this transistor 42 on.
- Capacitor 41 then discharges to the ground 101 through resistor 36 and the source/drain junction of transistor 42. Accordingly, capacitor 41 will never become fully charged, the breakdown voltage of Zener diode 40 will never be reached, and no short circuit will be created between the terminals 15 and 101 of rectifier 14. Then, the input fuse of functional block 12 will remain intact.
- the fuse blow-out circuit 16 comprises the input 48 to receive the rectified voltage from terminal 15 of the rectifier 14.
- the fuse blow-out circuit 16 also comprises the second input 49 receiving the LED current sense signal 23 from the current sensor 100 ( Figure 1). As long as no LED current sense signal 23 appears on the input 49, FET transistor 42 is turned off. When transistor 42 is turned off, capacitor 34 is being charged through resistor 31 and diode 32 from the voltage supplied on the input 48. When the voltage across the capacitor 34 reaches the breakdown voltage of the Zener diode 44, (while transistor 42 is still turned off) Zener diode 44 starts conducting current.
- a current is then supplied to the base of a PNP transistor 45 through resistor 31 , diode 32 and Zener diode 44 to turn this transistor 45 on.
- the collector/emitter junction of the transistor 45 becomes conductive to supply a current to the gate electrode of a FET transistor 46.
- This turns the FET transistor 46 on to establish a short circuit between output terminals 15 and 101 of the rectifier 14 through the source/drain junction of the FET transistor 46.
- the emitter of the transistor 45 and the gate electrode of the transistor 46 are both connected to the ground through a resistor 47.
- This short circuit will effectively blow out the input fuse of block 12, thereby opening the circuit. Detection of that open circuit will indicate that the LED lamp 8 is defective thereby emulating the open circuit of a defective incandescent lamp.
- the LED current sense signal 23 appears on the input 49 prior to lapsing of the above mentioned given period of time, this signal 23 is supplied to the gate electrode 102 of FET transistor 42 to thereby turn transistor 42 on. This connects the positive terminal of capacitor 34 to ground 101 through resistor 36 to thereby discharge capacitor 34. In this case, the breakdown voltage of Zener diode 44 will never be reached, transistor 45 will remain turned off, and no short circuit will be created between output terminals 15 and 101 of rectifier 14. The input fuse of block 12 will, in this case, remain intact.
- the "fuse blow-out time” must be longer than the "LED current set up time”.
- the LED current set up time is approximately 100 msec.
- the "LED current set up time” is the period of time between switching the LED lamp on and appearance of the LED current sense signal 23 at input 49.
- the cold filament detection circuit 18 of Figure 3 is used , consult with PCT/CAOO/01380 39553
- Lamp proving is usually performed by sending a voltage pulse on the voltage supply line 11 , and verifying that current rises to a certain level, within a certain period of time. This represents the behaviour of an incandescent lamp, which is equivalent to a simple resistor.
- a LED lamp uses a power supply which has a current set up time. Therefore, when sending a pulse on line 11 , the current will not rise immediately, but only after the power factor controller 28 is turned on (for example after about 100 msec in an embodiment).
- the cold filament detection circuit 18 of Figure 3 solves this problem.
- the LED current sense signal 23 When power is applied on line 11 for a period of time which is longer than the LED current set up time, the LED current sense signal 23 will be supplied on an input 57 of the cold filament detection circuit 18. This signal 23 is applied to the base 105 of a PNP transistor 54 to turn on this transistor 54 thereby turning transistor 53 off by forcing its gate electrode 104 to the ground 101. The cold filament detection circuit 18 is thereby disabled to enable the LED lamp 8 to operate normally.
- Biasing resistor 50 and Zener diode 55 are connected in series between the input 56 and the base electrode 105. Biasing resistor 50 is also used for overvoltage protection.
- the cold filament detection circuit 18 also serves as a back up for the fuse blow-out circuit 16. If fuse blow-out circuit 16 was to fail (that is, it does not cause a short circuit to blow out the input fuse of block 12 when in fact it should), transistor 53 would remain turned on since no LED current sense signal 23 would appear on input 57. The current draw through resistor 52 is sufficiently high to blow out the input fuse of block 12 after a certain period of time. For example, in an embodiment of the invention, this time period is of a few minutes.
- the turn-off voltage circuit 30 of Figure 4 simply inhibits the power factor controller 28 (see Figure 1 ) when the input voltage on line 11 of the circuit 30 is below a first predetermined trigger voltage.
- the turn-off voltage circuit 30 comprises an input 70 supplied with the voltage on the output terminal 15 of the rectifier 14.
- the first predetermined trigger voltage 72 is determined by a voltage divider comprising resistors 60 and 69 serially connected between the input 70 of the turn-off voltage circuit 30 and the ground 101.
- the first predetermined trigger voltage is established after a capacitor 68 has been charged through the resistor 60 and the diode 61 , i.e. after a given period of time following application of the voltage on the input 70. This period of time is determined by the values of the resistors 60, 69 and 107 and of the capacitor 68.
- the first predetermined trigger voltage 72 is applied to a gate electrode 106 of a FET transistor 65 through the diode 61. When the first trigger voltage 72 reaches the breakdown voltage of the gate electrode 106 of the FET transistor 65, transistor 65 is turned on.
- the turn-off voltage circuit 30 comprises a terminal 71 connected to a control terminal 29 of the power factor controller 28.
- the power factor controller 28 produces a voltage drop across high impedance resistor 62, to thereby produce a second trigger voltage 73, which in turn turns on a FET transistor 63.
- This in turn creates a low impedance path comprising resistor 67 between terminal 29 of the power factor controller 2 and the ground 101.
- transistor 63 is turned on, the voltage on terminal 29 of power factor controller 28 will be lower than the voltage level required to turn on the power factor controller 28.
- transistor 65 When transistor 65 is turned on, this will modify the second trigger voltage 73 thereby turning off transistor 63. The voltage on terminal 29 will then reach the level required to turn on the power factor controller 28, due to the high impedance value of the resistor 62.
- the LED lamp 8 will not be turned on until the first trigger voltage 72 is reached and once the lamp 8 is lit, it will stay on until the voltage on input 70 produces a first trigger voltage 72 which is below the transistor 65 trigger voltage (breakdown voltage of the gate electrode 106).
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02022507A EP1274285A1 (en) | 1999-11-19 | 2000-11-17 | Method and device for remote monitoring of LED lamps |
EP02022506A EP1280383B9 (en) | 1999-11-19 | 2000-11-17 | Method and device for remote monitoring of led lamps |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2290203 | 1999-11-19 | ||
CA002290203A CA2290203A1 (en) | 1999-11-19 | 1999-11-19 | Method and device for remote verification of led lamps |
US54324000A | 2000-04-05 | 2000-04-05 | |
US543240 | 2000-04-05 | ||
PCT/CA2000/001380 WO2001039553A1 (en) | 1999-11-19 | 2000-11-17 | Method and device for remote monitoring of led lamps |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02022507A Division EP1274285A1 (en) | 1999-11-19 | 2000-11-17 | Method and device for remote monitoring of LED lamps |
EP02022506A Division EP1280383B9 (en) | 1999-11-19 | 2000-11-17 | Method and device for remote monitoring of led lamps |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1147687A1 true EP1147687A1 (en) | 2001-10-24 |
EP1147687B1 EP1147687B1 (en) | 2005-01-26 |
Family
ID=25681345
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00979299A Expired - Lifetime EP1147687B1 (en) | 1999-11-19 | 2000-11-17 | Device for remote monitoring of Led lamps |
EP02022506A Expired - Lifetime EP1280383B9 (en) | 1999-11-19 | 2000-11-17 | Method and device for remote monitoring of led lamps |
EP02022507A Ceased EP1274285A1 (en) | 1999-11-19 | 2000-11-17 | Method and device for remote monitoring of LED lamps |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02022506A Expired - Lifetime EP1280383B9 (en) | 1999-11-19 | 2000-11-17 | Method and device for remote monitoring of led lamps |
EP02022507A Ceased EP1274285A1 (en) | 1999-11-19 | 2000-11-17 | Method and device for remote monitoring of LED lamps |
Country Status (4)
Country | Link |
---|---|
EP (3) | EP1147687B1 (en) |
AU (1) | AU1684601A (en) |
DE (2) | DE60017709T2 (en) |
WO (1) | WO2001039553A1 (en) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6762563B2 (en) * | 1999-11-19 | 2004-07-13 | Gelcore Llc | Module for powering and monitoring light-emitting diodes |
US6392553B1 (en) | 2000-08-22 | 2002-05-21 | Harmon Industries, Inc. | Signal interface module |
GB2371689B (en) * | 2001-03-10 | 2003-07-16 | Siemens Plc | Electrical apparatus and method |
GB2408834B (en) | 2001-12-11 | 2005-07-20 | Westinghouse Brake & Signal | Signal lamps and apparatus |
JP2004009825A (en) * | 2002-06-05 | 2004-01-15 | Koito Mfg Co Ltd | Lighting fixture apparatus for vehicle |
JP5480250B2 (en) | 2008-05-05 | 2014-04-23 | コーニンクレッカ フィリップス エヌ ヴェ | Light emitting diode system |
DE102008029725A1 (en) * | 2008-06-23 | 2010-01-07 | Siemens Aktiengesellschaft | signaler |
DE102008044525B4 (en) * | 2008-09-15 | 2014-02-13 | Werner Turck Gmbh & Co. Kg | One or more LEDs having lamp, in particular flashing lamp for a motor vehicle |
CZ2010450A3 (en) | 2010-06-07 | 2011-12-14 | Ažd Praha S. R. O. | System for electronic control of light emitting diodes LED |
CN102256413B (en) * | 2011-04-08 | 2014-09-17 | 西安电子科技大学 | Electric carrier wave lighting control system |
CN102230956A (en) * | 2011-06-21 | 2011-11-02 | 天津市顺通电子有限公司 | Real-time turning-on and turning-off detection method for power frequency commercial lamp set |
US8974077B2 (en) | 2012-07-30 | 2015-03-10 | Ultravision Technologies, Llc | Heat sink for LED light source |
DE102012019861B4 (en) * | 2012-10-10 | 2021-03-11 | Bbr Verkehrstechnik Gmbh | Method for operating a signal transmitter and signal transmitter |
CN102892238B (en) * | 2012-10-30 | 2015-02-04 | 四川新力光源股份有限公司 | Dimming drive circuit of AC (Alternating Current) direct drive LED module |
US9345088B2 (en) * | 2013-06-07 | 2016-05-17 | Texas Instruments Incorporated | LED control circuits and methods |
CN106304512B (en) * | 2016-11-03 | 2018-03-30 | 成都锦瑞芯科技有限公司 | A kind of linear LED drive circuits for controllable silicon light modulation |
CN106954317B (en) * | 2017-05-15 | 2018-05-04 | 中国矿业大学 | A kind of solar lighting intelligent control circuit |
EP3813489A1 (en) * | 2019-10-26 | 2021-04-28 | Graphene Lighting PLC | Multi-path led driver circuit |
CN110913527B (en) * | 2019-11-12 | 2022-06-21 | 上海铁大电信科技股份有限公司 | Supervision driving circuit |
Family Cites Families (5)
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 |
US6150771A (en) * | 1997-06-11 | 2000-11-21 | Precision Solar Controls Inc. | Circuit for interfacing between a conventional traffic signal conflict monitor and light emitting diodes replacing a conventional incandescent bulb in the signal |
EP0929992B1 (en) * | 1997-08-01 | 2003-08-06 | Koninklijke Philips Electronics N.V. | Circuit arrangement, and signaling light provided with the circuit arrangement |
CA2225005A1 (en) * | 1997-12-17 | 1999-06-17 | Gelcore Llc | Led lamp with a fault-indicating empedance-changing circuit |
WO1999056504A1 (en) * | 1998-04-29 | 1999-11-04 | Koninklijke Philips Electronics N.V. | Circuit arrangement for a semiconductor light source |
-
2000
- 2000-11-17 DE DE60017709T patent/DE60017709T2/en not_active Expired - Lifetime
- 2000-11-17 EP EP00979299A patent/EP1147687B1/en not_active Expired - Lifetime
- 2000-11-17 EP EP02022506A patent/EP1280383B9/en not_active Expired - Lifetime
- 2000-11-17 DE DE60043160T patent/DE60043160D1/en not_active Expired - Lifetime
- 2000-11-17 AU AU16846/01A patent/AU1684601A/en not_active Abandoned
- 2000-11-17 WO PCT/CA2000/001380 patent/WO2001039553A1/en active IP Right Grant
- 2000-11-17 EP EP02022507A patent/EP1274285A1/en not_active Ceased
Non-Patent Citations (1)
Title |
---|
See references of WO0139553A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE60017709T2 (en) | 2006-04-06 |
DE60017709D1 (en) | 2005-03-03 |
EP1280383B9 (en) | 2010-05-19 |
WO2001039553A1 (en) | 2001-05-31 |
EP1280383A1 (en) | 2003-01-29 |
EP1274285A1 (en) | 2003-01-08 |
EP1280383B1 (en) | 2009-10-14 |
DE60043160D1 (en) | 2009-11-26 |
AU1684601A (en) | 2001-06-04 |
EP1147687B1 (en) | 2005-01-26 |
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