WO2010142006A2 - Method and device for thermal protection and management of light source - Google Patents
Method and device for thermal protection and management of light source Download PDFInfo
- Publication number
- WO2010142006A2 WO2010142006A2 PCT/BG2010/000010 BG2010000010W WO2010142006A2 WO 2010142006 A2 WO2010142006 A2 WO 2010142006A2 BG 2010000010 W BG2010000010 W BG 2010000010W WO 2010142006 A2 WO2010142006 A2 WO 2010142006A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light source
- value
- power supply
- control
- thermal sensor
- 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]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
-
- 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
- H05B45/56—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving measures to prevent abnormal temperature of the 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]
Definitions
- the method and device for thermal protection and management of light source can be applied in general lighting technology, including street lighting, traffic light systems, etc.
- Another way of operation is to supply the light source with lower than nominal power in order to avoid overheating.
- the drawback of the first method is light source's lifetime reduction due to thermal degrade.
- the second way doesn't utilize the full capacity of the light source, thus it is an inefficient method.
- the goal of the invention is to define a method for thermal protection and management of light sources, maintaining an optimal operation in high temperature conditions, while reducing the costs and keeping the original lifetime.
- the task is solved with a method, according the invention, which includes:
- the sensor's signal is permanently connected to a control block, which
- thermal sensor's value is lower than preset or currently set optimal degree To, then the supplied power is increased via current, voltage or PWM (pulse width modulation) regulation to its nominal value if not reached yet; - If thermal sensor's value is equal to To, then the power is not changed;
- thermal sensor's value is greater than To, but lower than a preset critical degree Tcr, then the supplied power is reduced via predefined rule thus maintaining an optimal operation temperature through reducing the dissipated power;
- the method is providing an additional variant for remote control, diagnostics and telemetry by an integral control and dispatch centre, which takes an automatic or manual (by human operator) decisions at the following cases: a) Failure of one or more light sources - the control centre is producing a visual, audible, SMS or any other useful warning; b) Critical conditions shut-down (Tcr, over or under voltage, etc.) - the control centre is producing a warning and logging the event into a database for further analysis and corrections; c) Remote control - light intensity of one or more sources is regulated or switched on/off via an operator or automatically (light sensors, etc.); d) Retrieving environmental information - ambient light intensity, smoke, fog and noise level, humidity, temperature, air pressure and velocity, motion, etc via proper sensors, located near and connected to the control block.
- An apparatus accomplishing the above described method is built, including thermal sensor, mounted near the light source and connected to a control unit, which controls the power supply, measuring LED current and voltage and maintains two-way communication with the control centre by wire (PLC, PLM, ect.) and radio (UHF ISM, GSM, WiFi, etc.).
- Figure 1 is a scheme of a device that works according the method for thermal protection and management of light source
- LED lamp consisted of one high-power LED
- the sensor's signal is permanently connected to control unit, which
- thermo sensor's value is lower than preset or currently set optimal degree To, then the supplied power is increased via current, voltage or PWM regulation to its nominal value if not reached yet;
- thermal sensor's value is equal to To, then the power is not changed; - If thermal sensor's value is greater than To, but lower than a preset critical degree Tcr, then the supplied power is reduced via predefined rule thus maintaining an optimal operation temperature through reducing the dissipated power;
- thermal sensor's value is equal or greater than Tcr, then power supply is turned off in order to protect the light source from damage due overheating. Power supply would be turned on again when the temperature decreases to To.
- a device has been built, which accomplishes the method of Example 2, comprising thermal sensor (1), attached to the LED lamp (2) and connected to control unit, which is measuring the
- the control unit is also connected to PLM (4), connected to the power supply (5), as well as to radio (7) and to LED lamp power supply control block (6), which input is attached to the power supply (5) and output - to LED lamp (2).
Abstract
Method and device for thermal protection and management of light source are utilized in lighting industry, including street and traffic lights. According the method change of light source power supply is two-way controlled via thermal sensor, connected to control unit, which tracks light source temperature and regulates the supplied power. Method variants for operational and environmental information exchange with remote centre are developed. Advantages of method and device are luminary failures reduction due optimal operation; intelligent light source control; fast reaction to failures without additional expenses; data collection for statistical or other purposes.
Description
Method and device for thermal protection and management of light source
Technical Field
The method and device for thermal protection and management of light source can be applied in general lighting technology, including street lighting, traffic light systems, etc.
Background Art Usually the light sources are operated in way according the optimal specification, given by the manufacturer, but without reducing the supplied power at higher operational temperature.
Another way of operation is to supply the light source with lower than nominal power in order to avoid overheating.
The drawback of the first method is light source's lifetime reduction due to thermal degrade. The second way doesn't utilize the full capacity of the light source, thus it is an inefficient method.
Summary of the Invention
The goal of the invention is to define a method for thermal protection and management of light sources, maintaining an optimal operation in high temperature conditions, while reducing the costs and keeping the original lifetime.
The task is solved with a method, according the invention, which includes:
A) Light source (lamp, high-power LED or group of LEDs) temperature tracking via one or more thermal sensors, located directly or indirectly via thermal bridge/conductor to the source. The sensor's signal is permanently connected to a control block, which
B) According the sensor signal value is producing one of the following control signals:
- If thermal sensor's value is lower than preset or currently set optimal degree To, then the supplied power is increased via current, voltage or PWM (pulse width modulation) regulation to its nominal value if not reached yet; - If thermal sensor's value is equal to To, then the power is not changed;
- If thermal sensor's value is greater than To, but lower than a preset critical degree Tcr, then the supplied power is reduced via predefined rule thus maintaining an optimal operation temperature through reducing the dissipated power;
- If thermal sensor's value is equal or greater than Tcr, then power supply is turned off in order to protect the light source from damage due overheating. Power supply would be turned on again when the temperature decreases to To.
The method is providing an additional variant for remote control, diagnostics and telemetry by an integral control and dispatch centre, which takes an automatic or manual (by human operator) decisions at the following cases: a) Failure of one or more light sources - the control centre is producing a visual, audible, SMS or any other useful warning; b) Critical conditions shut-down (Tcr, over or under voltage, etc.) - the control centre is producing a warning and logging the event into a database for further analysis and corrections; c) Remote control - light intensity of one or more sources is regulated or switched on/off via an operator or automatically (light sensors, etc.); d) Retrieving environmental information - ambient light intensity, smoke, fog and noise level, humidity, temperature, air pressure and velocity, motion, etc via proper sensors, located near and connected to the control block.
An apparatus, accomplishing the above described method is built, including thermal sensor, mounted near the light source and connected to a control unit, which controls the power supply, measuring LED current and voltage and maintains two-way communication with the control centre by wire (PLC, PLM, ect.) and radio (UHF ISM, GSM, WiFi, etc.).
The advantages of the method are: - Luminary failure reduction due light source optimal operation maintaining;
- Flexible and intelligent light source control
Fast reaction in case of failures without additional expenses
Data collection is provided for statistical or other purposes
Brief Description of Drawings
Figure 1 is a scheme of a device that works according the method for thermal protection and management of light source
Modes for carrying out the Invention Samples of the method and apparatus have been developed, without any limitation only to the presented examples below.
Example 1:
Method for light source (LED lamp, consisted of one high-power LED), which includes: A) Light source (lamp, high-power LED or group of LEDs) temperature tracking via one or more thermal sensors, located directly or indirectly via thermal bridge/conductor to the source. The sensor's signal is permanently connected to control unit, which
B) According the sensor signal value is producing one of the following control signals:
- If thermal sensor's value is lower than preset or currently set optimal degree To, then the supplied power is increased via current, voltage or PWM regulation to its nominal value if not reached yet;
- If thermal sensor's value is equal to To, then the power is not changed; - If thermal sensor's value is greater than To, but lower than a preset critical degree Tcr, then the supplied power is reduced via predefined rule thus maintaining an optimal operation temperature through reducing the dissipated power;
- If thermal sensor's value is equal or greater than Tcr, then power supply is turned off in order to protect the light source from damage due overheating. Power supply would be turned on again when the temperature decreases to To.
Example 2:
Method is developed, where in addition to Example 1, the light source is a set of multiple
LED and in addition to the basic functions: tracking and thermal management, a complementary information about the luminary operation (temperature, voltage, current, etc.) and environmental
(light, smoke, noise, motion, pressure, etc.) conditions, retrieved by additional sensors, is exchanged with the control centre by wire (PLM) at the following cases a) Failure of one or more light sources - the control centre is producing a visual, audible, SMS or any other useful warning; b) Critical conditions shut-down (Tcr, over or under voltage, etc.) - the control centre is producing a warning and logging the event into a database for further analysis and corrections; c) Remote control - light intensity of one or more sources is regulated or switched on/off via an operator or automatically (light sensors, etc.); d) Retrieving environmental information - ambient light intensity, smoke, fog and noise level, humidity, temperature, air pressure and velocity, motion, etc. via the proper sensors, located near and connected to the control block.
Example 3:
A device has been built, which accomplishes the method of Example 2, comprising thermal sensor (1), attached to the LED lamp (2) and connected to control unit, which is measuring the
LED operational temperature. The control unit is also connected to PLM (4), connected to the power supply (5), as well as to radio (7) and to LED lamp power supply control block (6), which input is attached to the power supply (5) and output - to LED lamp (2).
Industrial Applicability
The operation and usage of the device, accomplishing the invention are obvious by the nature of the method and its explanation above.
3
Claims
PATENT CLAIMS
Claim 1: Method for thermal protection and management of light source, where in case of high operational temperature the supplied power is reduced, characterized in that the change of power supply is bi-directional and the working temperature of the light source (2) is tracked by one or more thermal sensors (1), connected to the control unit, which according the retrieved value, is producing a control signal that is regulating the power, which supplies the light source (2).
Claim 2: Method according claim 1, characterized in that according the value of the thermal sensor signal is producing a control signal as follows:
- If thermal sensor's value is lower than preset or currently set optimal degree To, then the supplied power is increased via current, voltage or PWM regulation to its nominal value if not reached yet;
- If thermal sensor's value is equal to To, then the power is not changed;
- If thermal sensor's value is greater than To, but lower than a preset critical degree Tcr, then the supplied power is reduced via predefined rule thus maintaining an optimal operation temperature through reducing the dissipated power;
- If thermal sensor's value is equal or greater than Tcr, then power supply is turned off in order to protect the light source from damage due overheating. Power supply would be turned on again when the temperature decreases to To.
Claim 3: Method according claims 1 or 2, characterized in that the operational and environmental information is exchanged remotely with the control centre.
Claim 4: Method according the claim 3, characterized in that the remotely retrieved information by the control centre is collected and processed to a database.
Claim 5: Method according claims 3 or 4, characterized in that the received information in the control centre is initiating automatically or manually (by an operator) responding warnings and/or light source control commands.
Claim 6: Method according the claim 5, characterized in that at the following cases: a) Failure of one or more light sources is producing a visual, audible, SMS or any other useful warning; b) Critical conditions shut-down (Tcr, over or under voltage, etc.) - the control centre is producing a warning and logging the event into a database for further analysis and corrections; c) Remote control -light intensity of one or more sources is regulated or switched on/off via an operator or automatically (light sensors, etc.); d) Retrieving environmental information - ambient light intensity, smoke, fog and noise level, humidity, temperature, air pressure and velocity, motion, etc. via the proper sensors, located near and connected to the control block.
Claim 7: A device, accomplishing the above described method, according claims 1, 2, 3, 4, 5 and 6, comprising thermal sensor (1), located closely to or into the light source (2) and connected to control unit (3), measuring the operational temperature, which is also attached to LED lamp power supply control block (6), which input is connected to the power supply (5) and output - to light source (2).
Claim 8: A device, according claim 6, characterized in that the control unit (3) is connected in addition to radio (7) and/or to PLC modem (4), which is connected to power supply (5).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BG10110405A BG110405A (en) | 2009-06-12 | 2009-06-12 | Method for temperature protection and control of a light source and device implementing the method |
| BG110405 | 2009-06-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2010142006A2 true WO2010142006A2 (en) | 2010-12-16 |
| WO2010142006A3 WO2010142006A3 (en) | 2011-04-07 |
Family
ID=43125588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/BG2010/000010 WO2010142006A2 (en) | 2009-06-12 | 2010-06-11 | Method and device for thermal protection and management of light source |
Country Status (2)
| Country | Link |
|---|---|
| BG (1) | BG110405A (en) |
| WO (1) | WO2010142006A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9265119B2 (en) | 2013-06-17 | 2016-02-16 | Terralux, Inc. | Systems and methods for providing thermal fold-back to LED lights |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6362578B1 (en) * | 1999-12-23 | 2002-03-26 | Stmicroelectronics, Inc. | LED driver circuit and method |
| DE10134246A1 (en) * | 2001-07-18 | 2003-02-06 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Control gear for LEDs with temperature-dependent current control |
| DE602006014955D1 (en) * | 2006-06-28 | 2010-07-29 | Osram Gmbh | LED circuit with current regulation |
| US7741825B2 (en) * | 2006-11-02 | 2010-06-22 | Infineon Technologies Ag | Power supply circuit with temperature-dependent drive signal |
| CN100592372C (en) * | 2007-03-30 | 2010-02-24 | 群康科技(深圳)有限公司 | Drive circuit and drive method for LED as well as LED device |
| US7948190B2 (en) * | 2007-04-10 | 2011-05-24 | Nexxus Lighting, Inc. | Apparatus and methods for the thermal regulation of light emitting diodes in signage |
| US7663326B2 (en) * | 2007-05-22 | 2010-02-16 | Msilica Incorporated | Temperature dependant LED current controller |
-
2009
- 2009-06-12 BG BG10110405A patent/BG110405A/en unknown
-
2010
- 2010-06-11 WO PCT/BG2010/000010 patent/WO2010142006A2/en active Application Filing
Non-Patent Citations (1)
| Title |
|---|
| None |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9265119B2 (en) | 2013-06-17 | 2016-02-16 | Terralux, Inc. | Systems and methods for providing thermal fold-back to LED lights |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2010142006A3 (en) | 2011-04-07 |
| BG110405A (en) | 2010-12-30 |
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