GB2547433A - Means and method for controlling lighting apparatus to prevent the overheating of the same - Google Patents
Means and method for controlling lighting apparatus to prevent the overheating of the same Download PDFInfo
- Publication number
- GB2547433A GB2547433A GB1602753.4A GB201602753A GB2547433A GB 2547433 A GB2547433 A GB 2547433A GB 201602753 A GB201602753 A GB 201602753A GB 2547433 A GB2547433 A GB 2547433A
- Authority
- GB
- United Kingdom
- Prior art keywords
- emitting light
- temperature
- controlling
- determined threshold
- controlled
- 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.)
- Withdrawn
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]
- H05B45/10—Controlling the intensity of the light
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
A lighting control system having a light source/emitter C and means B for measuring or estimating the temperature of the light source or in close proximity to the lamp. Depending on whether the temperature of, or near, the light source is above or below a pre-determined threshold, the output of the light source is controlled to bring the temperature back towards the pre-determined threshold. The means for measuring or estimating the temperature may be a thermistor, thermocouple, resistance temperature detector, pyrometer or infrared thermometer. The means A of controlling the light source is by way of pulse width modulation or a proportional integral derivative controller. The light source may be a lamp or light emitting diode (LED).
Description
TECHNICAL FIELD
This invention relates to the field of control electronics for use with lighting apparatus.
BACKGROUND
The overheating of light emitting diodes [LEDs] is known to impact significantly upon the life of the component. A reduction in light output, changes in the spectra of light emitted and/or the failure of the component are all known consequences of operating said components outside their normal environmental operating parameters.
Similarly, operating other means for emitting light outside their normal operating parameters can lead to equally severe consequences.
This problem is particularly prevalent among high-powered luminaires, where the amount of energy emitted as heat rather than light can cause the temperature of the components to rise significantly. This effect can be compounded by high ambient temperatures, especially in hot climates or heated indoor spaces, where the heat tends to rise and gather in the roof-space around said luminaires.
Solutions to this problem have varied: some have opted to use heatsinks to draw heat away from the components, others have chosen to install fans within the luminaires to help draw hot air away from the same.
Several problems are associated with these solutions:
Firstly, where a heatsink is used, the size of heatsink required is often determined by an expectation of how much heat will be emitted when said means for emitting light is operating within normal parameters. As such, when the lamp operates outside of normal parameters, the heatsink is unable to dissipate the heat being generated sufficiently quickly and this can cause the temperature of the means for emitting light to rise beyond prescribed operating parameters.
Secondly, where a heatsink is used, the size and weight of the heatsink required to sufficiently dissipate the heat, can often be prohibitively large and heavy.
Thirdly, where a fan is used, the mechanical components within said fan are prone to failure. Should failure occur, the means for emitting light can heat up quickly beyond normal operating parameters. This can be especially true where LEDs are used as the means for emitting light, as the expected life of an LED often far exceeds the expected life of the fan.
What is required is a non-mechanical, variable means for controlling the temperature of means for emitting light such that said means continue to operate within normal operating parameters, despite the ambient temperature rising or falling outside expected operating parameters.
THE PRESENT INVENTION
The present invention provides a solution to these problems:
According to one possible embodiment of the present invention, means are provided for determining the temperature (Figure 1, B) of, or in close proximity to, the means for emitting light (Figure 1, C}.
In a preferred embodiment of the present invention, the means for emitting light are at least one light emitting diode.
In a preferred embodiment of the present invention, the means for measuring temperature may be a thermistor.
In a preferred embodiment of the present invention, having determined the temperature of or around the means for emitting light, the means for emitting light is controlled (Figure 1, A) based, at least in part, upon said determined temperature.
In a preferred embodiment of the present invention, where said determined temperature indicates that the actual temperature of the means for emitting light is any of outside normal operating parameters or likely to rise or fall outside normal operating parameters, the current through the means for emitting light is any of increased and reduced in order to ensure that the means for emitting light continues to operate within normal operating parameters.
According to a second possible embodiment of the present invention, means are provided for estimating the temperature of the aforementioned means for emitting light and operating the means for emitting light in response to said estimate.
In a preferred embodiment of the present invention, the estimate of the temperature of said means for emitting light may be determined using at least one of any of the resistance of said means for emitting light, the current drawn by said means for emitting light and the voltage applied to said means for emitting light.
According to the second possible embodiment of the present invention, the means for emitting light is controlled as described in the first possible embodiment of the present invention to help ensure that that the means for emitting light do not operate outside normal operating parameters.
In a preferred embodiment of the present invention, the means for emitting light is controlled by at least one of any of pulse width modulation (PWM) control and a proportional-integral-derivative (PID) control.
All of the above-described embodiments improve the control of lighting apparatus. Any of the embodiments may be partly embodied in hardware or in software equivalents that perform the same functions. It will be appreciated by the person of skill in the art that various modifications may be made to the above-described embodiments without departing from the scope of the invention according to the appended claims.
Claims (14)
1. A lighting control system incorporating at least one means for emitting light and at least one means for at least one of any of measuring and estimating at least one of any of the temperature of said means for emitting light and the temperature in close proximity to said means for emitting light, where said means for emitting light is controlled based, at least in part, upon said at least one of any of measured and estimated temperature.
2. A lighting control system according to claim 1 where said means for emitting light is at least one of any of a light emitting diode (LED), organic light emitting diode (OLED), cold cathode lamp, fluorescent lamp, incandescent lamp and halogen lamp.
3. A lighting control system according to claim 1 where said means for at least one of any of measuring and estimating at least one of any of the temperature of said means for emitting light and the temperature in close proximity to said means for emitting light is at least one of any of a thermistor, thermocouple, resistance temperature detector, pyrometer and infrared thermometer.
4. A lighting control system according to any of the preceding claims were said means for emitting light is controlled by at least one of any of a mechanical controller and an electronic controller.
5. A lighting control system according to any of the preceding claims where said means for emitting light is controlled, at least in part, through the use of pulse width modulation.
6. A lighting control system according to any of the preceding claims where said means for emitting light is controlled, at least in part, by a proportional-integral-derivative controller.
7. A lighting control system according to any of the preceding claims where said means for emitting light is controlled, at least in part, by controlling the current through the means for emitting light.
8. A method of controlling means for emitting light where at least one of any of the temperature of said means for emitting light and the temperature in close proximity to said means for emitting light is at least one of any of measured and estimated and said means for emitting light is controlled based, at least in part, upon at least one of any of said measured and said estimated temperature.
9. A method of controlling means for emitting light according to claim 8 where said means for emitting light is controlled, at least in part, by controlling the current through the means for emitting light.
10. A method of controlling means for emitting light according to any of claims 8 and 9 where said means for emitting light is controlled, at least in part, through the use of pulse width modulation.
11. A method of controlling means for emitting light comprising steps of: determining that the temperature of said means for emitting light at least one of any of has risen above a pre-determined threshold and is likely to rise above a pre-determined threshold; and controlling said means for emitting light to reduce the temperature of the same.
12. A method of controlling means for emitting light comprising steps of: estimating that the temperature of said means for emitting light at least one of any of has risen above a pre-determined threshold and is likely to rise above a pre-determined threshold; and controlling said means for emitting light to reduce the temperature of the same.
13. A method of controlling means for emitting light comprising steps of: determining that the temperature of said means for emitting light at least one of any of has fallen below a pre-determined threshold and is likely to fall below a pre-determined threshold; and controlling said means for emitting light to increase the temperature of the same.
14. A method of controlling means for emitting light comprising steps of: estimating that the temperature of said means for emitting light at least one of any of has fallen below a pre-determined threshold and is likely to fall below a pre-determined threshold; and controlling said means for emitting light to increase the temperature of the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1602753.4A GB2547433A (en) | 2016-02-16 | 2016-02-16 | Means and method for controlling lighting apparatus to prevent the overheating of the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1602753.4A GB2547433A (en) | 2016-02-16 | 2016-02-16 | Means and method for controlling lighting apparatus to prevent the overheating of the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201602753D0 GB201602753D0 (en) | 2016-03-30 |
| GB2547433A true GB2547433A (en) | 2017-08-23 |
Family
ID=55697775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1602753.4A Withdrawn GB2547433A (en) | 2016-02-16 | 2016-02-16 | Means and method for controlling lighting apparatus to prevent the overheating of the same |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2547433A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050190171A1 (en) * | 2003-12-19 | 2005-09-01 | Hyeon-Yong Jang | Display device and device of driving light source therefor |
| US20070057902A1 (en) * | 2005-09-09 | 2007-03-15 | Samsung Electro-Mechanics Co., Ltd. | Circuit for controlling LED with temperature compensation |
| US20090195171A1 (en) * | 2008-02-05 | 2009-08-06 | Wei-Hao Huang | Temperature control system for backlight module |
| US20130293124A1 (en) * | 2012-05-07 | 2013-11-07 | Lighting Science Group Corporation | System for generating light having a constant color temperature and associated methods |
-
2016
- 2016-02-16 GB GB1602753.4A patent/GB2547433A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050190171A1 (en) * | 2003-12-19 | 2005-09-01 | Hyeon-Yong Jang | Display device and device of driving light source therefor |
| US20070057902A1 (en) * | 2005-09-09 | 2007-03-15 | Samsung Electro-Mechanics Co., Ltd. | Circuit for controlling LED with temperature compensation |
| US20090195171A1 (en) * | 2008-02-05 | 2009-08-06 | Wei-Hao Huang | Temperature control system for backlight module |
| US20130293124A1 (en) * | 2012-05-07 | 2013-11-07 | Lighting Science Group Corporation | System for generating light having a constant color temperature and associated methods |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201602753D0 (en) | 2016-03-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10278249B2 (en) | High ambient temperature LED luminaire with thermal compensation circuitry | |
| US7538499B2 (en) | Method and apparatus for controlling thermal stress in lighting devices | |
| US9781803B2 (en) | LED thermal management system and method | |
| US9066394B2 (en) | Method and apparatus providing deep dimming of solid state lighting systems | |
| US8450948B2 (en) | Thermal foldback control for a light-emitting diode | |
| US7196481B2 (en) | Method and drive circuit for controlling LEDs | |
| US9107250B2 (en) | Method of operating an LED lighting system | |
| US20090184619A1 (en) | Led illuminantor and heat-dissipating method thereof | |
| CN109196951B (en) | Current regulation of a light-emitting diode lighting device | |
| EP2768286B1 (en) | Lighting device and lighting fixture | |
| GB2547433A (en) | Means and method for controlling lighting apparatus to prevent the overheating of the same | |
| EP2246615A1 (en) | LED illuminator and heat-dissipating method thereof | |
| CN202587492U (en) | High-power LED constant-voltage stable-current driving light source | |
| Mashkov et al. | LEDs' operation optimizing for long term lumen maintenance | |
| Shen et al. | Numerical Analysis of Thermal Management for High Power LED Array | |
| JP3193647U (en) | Light-emitting diode constant current device | |
| Zurfi et al. | Efficiency measurement of white LED devices | |
| CN113498232A (en) | Lighting device with thermal protection of driver | |
| TWI403259B (en) | Led illuminating apparatus and heat dissipation method thereof | |
| JP2013243082A (en) | Dimmer | |
| WO2011033432A1 (en) | Lighting module | |
| Ching et al. | Factors that influence thermal transient measurement of high power infrared emitter | |
| TW201823635A (en) | Automatic control system for led module | |
| KR20150137859A (en) | Insert type heat dissipating unit for light emitter | |
| KR20120007605A (en) | Apparatus and method for life extending of led lamp |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |