CN101749567B - LED system - Google Patents
LED system Download PDFInfo
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- CN101749567B CN101749567B CN200810241259XA CN200810241259A CN101749567B CN 101749567 B CN101749567 B CN 101749567B CN 200810241259X A CN200810241259X A CN 200810241259XA CN 200810241259 A CN200810241259 A CN 200810241259A CN 101749567 B CN101749567 B CN 101749567B
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- led
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Abstract
The invention is suitable for the field of lighting and provides an LED system. The LED system comprises an LED light source, a detecting unit for detecting a self-illumination parameter and/or an environmental parameter of the LED light source, and a brightness control unit which is connected with the detecting unit, carries out temperature reduction treatment on the environment in which the LED light source is positioned according to a detecting result of the detecting unit, and/or adjusts the brightness of the LED light source. By detecting the self-illumination parameter of the LED light source, or by detecting the environmental parameter of the LED light source, the LED system carries out real-time temperature reduction treatment or adjustment of the brightness of the LED light source so as to guarantee the brightness of the LED constant or the brightness of the LED luminous environment constant.
Description
Technical field
The invention belongs to the lighting field, relate in particular to a kind of LED system.
Background technology
Light emitting diode (Light Emitting Diode, light decay LED) is one of matter of utmost importance in illumination application, gets rid of outside the bad factor with improper use of LED quality; Light decay causes owing to LED is overheated to the full extent; LED brightness receives the influence of operating temperature bigger, and operating temperature is high more, and LED brightness is low more; Light decay is also just serious, and can influence the life-span of LED.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of LED system, so that the brightness of illumination of LED is constant.
The embodiment of the invention is achieved in that a kind of LED system, comprises led light source, and said LED system also comprises:
Detect the self-luminous parameter of said led light source and/or the detecting unit of ambient parameter; And
Brightness control unit is connected with said detecting unit, to the processing of lowering the temperature of said led light source environment of living in, and/or adjusts the brightness of said led light source according to the testing result of said detecting unit.
Said brightness control unit comprises:
The control module that is connected with said detecting unit;
The led drive circuit and/or the cooling module that are connected with said control module;
Said control module is controlled said led drive circuit according to the testing result of said detecting unit and is adjusted said led light source brightness; And/or control said cooling module to the processing of lowering the temperature of said led light source environment of living in according to the testing result of said detecting unit;
Be connected with isolator, amplifying circuit, A/D change-over circuit between said detecting unit and the said control module in turn; Be connected with on-off circuit between said control module and the said cooling module; Be connected with the D/A change-over circuit between said control module and the said led drive circuit.
The embodiment of the invention passes through to detect the self-luminous parameter of led light source, or passes through to detect the ambient parameter of led light source, the luminosity of lowering the temperature in real time and handling or adjusting led light source, thus guarantee the constant or LED lighting environment brightness constancy of LED luminosity.
Description of drawings
Fig. 1 is the structure principle chart of the LED system that provides of the embodiment of the invention;
Fig. 2 A is the structural representation of the led light source that provides of first embodiment of the invention;
Fig. 2 B is that led light source structure shown in Fig. 2 A is along the schematic cross-section of A-B direction;
Fig. 3 A is the structural representation of the led light source that provides of second embodiment of the invention;
Fig. 3 B is that led light source structure shown in Fig. 3 A is along the schematic cross-section of A-B direction;
Fig. 4 is the structural representation that adopts the LED system of light-source structure shown in Fig. 3 A and Fig. 3 B;
Fig. 5 is a kind of distressed structure sketch map of LED shown in Figure 4 system;
Fig. 6 is based on the structural representation of the control module of digital circuit;
Fig. 7 is based on the structural representation of the control module of analog circuit.
The specific embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
In the embodiment of the invention, detect the self-luminous parameter of led light source, or detect the ambient parameter of led light source, the luminosity of lowering the temperature in real time and handling or adjusting led light source.
Fig. 1 shows the structural principle of the LED system that the embodiment of the invention provides, and for the ease of describing, only shows the part relevant with the present invention.
With reference to Fig. 1; Detecting unit 12 detects the self-luminous parameter and/or the ambient parameter of led light source 11; Like parameters such as the brightness of the self-illuminating brightness of led light source 11, self-luminous temperature, led light source 11 environment of living in, temperature, when parameters such as the self-illuminating brightness that is used to detect led light source 11, self-luminous temperature, detecting unit 12 can place the positions such as led chip supporting mass, support body or inner walls of the inside of light source 11; When parameters such as the brightness that is used to detect led light source 11 environment of living in, temperature; Detecting unit 12 places led light source 11 outsides, on brightness control unit 13, and also can be simultaneously at the led light source 11 inside and outside detecting units that are provided with.
Detecting unit 12 is connected with brightness control unit 13; When detecting unit 12 detects self-luminous parameter and/or ambient parameter etc. when surpassing the preset threshold value of brightness control unit 13; The processing of lowering the temperature of 13 pairs of led light sources of brightness control unit, 11 environment of living in, and/or the brightness of adjustment led light source 11.
Further; Brightness control unit 13 comprises control module 131; And in the led drive circuit that is connected with led light source 11 132 and the cooling module 133 one or both; Control module 131 is connected with detecting unit 12, with the testing result of detecting unit 12 and threshold ratio, and when testing result satisfies threshold condition; Control module 131 is adjusted the brightness of led light sources 11 so that the luminosity of LED system keeps constant through led drive circuit 132; Perhaps control the processing of lowering the temperature of 133 pairs of systems of cooling module, also can be simultaneously processings of lowering the temperature of brightness and control cooling module 133 through led drive circuit 132 adjustment led light sources 11, wherein cooling module 133 can adopt fan or water circle device realization.
Fig. 2 A is the structural representation of the led light source that provides of first embodiment of the invention, and Fig. 2 B is that led light source structure shown in Fig. 2 A is along the schematic cross-section of A-B direction.With reference to Fig. 2 A, Fig. 2 B; One or more led chips 2 are installed on the chip holder 1, and wherein each led chip 2 does not have housing, and led chip 2 can be White-light LED chip or the led chip of sending out other color of light; The chip holder 1 preferential pottery of selecting is so that heat radiation.On chip holder 1, be fixed with temperature sensor 3, temperature sensor 3 can be thermocouple, thermistor, with the semiconductor device of temperature correlation and integrated chip etc.Spacing between temperature sensor 3 and the nearest led chip 2 should be as far as possible little under the situation that does not influence led chip and luminous mass; Make its temperature that obtains as much as possible near led chip 2 self actual temperature, should preferentially select the middle position between a plurality of led chips 2.1 also is fixed with light sensor 4 on chip holder, and light sensor 4 can be photo resistance, photosensitive semiconductor parts, integrated chip etc.Light sensor 4 can be installed arbitrary position that can receive led chip 2 light intensity, the preferential selection from led chip 2 and temperature sensor 3 position far away, to reduce the influence of temperature to light sensor 4.Identified one of light sensor 4 selectable locations among Fig. 2 A, being represented by dotted lines is because this position is not light sensor 4 optimal positions.When light sensor 4 is positioned at 1 last time of chip holder; Because the influence of led chip 2 angle of scatterings size can arrive the light on the light sensor 4; So near led chip 2, can design an optical element, luminous energy is arrived on the light sensor 4, but may reduce the utilization rate of led chip 2.Therefore light sensor 4 should preferentially be selected the position that does not influence its utilization rate again in led chip 2 spreads.The measured value of light sensor 4 can be used as the reliable basis of judging led chip 2 stability of photoluminescence, can be used for the size of current that feedback signal regulates the led chip 2 of flowing through.Wherein temperature sensor 3 can be fabricated on the chip holder 1 through printing method with light sensor 4.
Fig. 3 A is the structural representation of the led light source that provides of second embodiment of the invention, and Fig. 3 B is that led light source structure shown in Fig. 3 A is along the schematic cross-section of A-B direction.With reference to Fig. 3 A, Fig. 3 B, one or more led chips 2 are installed on the chip holder 1, and this chip holder 1, temperature sensor 3, light sensor 4 are installed on the support body 5.Spacing between temperature sensor 3 and the nearest led chip 2 should be as far as possible little under the situation that does not influence led chip 2 luminous masses, makes its temperature that obtains as much as possible near led chip 2 self actual temperature.Light sensor 4 can be in arbitrary position of support body 5.Support body 5 should preferentially be selected good material of thermal conductivity such as metal, so that heat radiation.Wherein temperature sensor 3, light sensor 4 can or be adhered on the support body through welding.For the light intensity that makes light sensor 4 can receive led chip changes, near led chip 2, also to design an optical element.Light sensor 4 should preferentially be selected the position that does not influence its utilization rate again in the led chip spread.
Fig. 4 is for adopting the structural representation of the LED system of light-source structure shown in Fig. 3 A and Fig. 3 B; One housing 6 is installed in the outside of led light source structure shown in Figure 2; Temperature sensor 3 is connected with brightness control unit 13 through two pins 9; Light sensor 4 also is connected (not shown) through two pins with brightness control unit 13, and led chip 2 also is connected with brightness control unit 13 through two pins, and brightness control unit 13 is positioned at outside the housing 6.When if the led chip through a plurality of different colours sends colourama,, can also draw many led chip groups that pin is driven different base colors respectively as required and reach the colour mixture effect like red-light LED, green light LED, blue-ray LED.Light sensor 4 should preferentially be selected the position that does not influence its utilization rate again in the led chip spread, for reducing the optical design complexity, can select to be placed on housing 6 inwalls.
Meet design requirement for helping led chip 2 luminous beams; As light is concentrated in the predetermined angular to satisfy the demand of different illumination occasions; Secondary lens 7 can be installed on housing 6,, can do decorative pattern or frosted on the secondary lens surface and handle if luminous too dazzling; Also can be for each led chip 2 perhaps a plurality of led chip 2 makes up optical element 8 being set on the led chip 2 or on, so that the luminous arrival light sensor 4 of led chip near led chip 2.
In addition because the too high meeting of temperature causes light decay,, as open fan, reduce electric current etc. so when temperature surpassed temperature threshold of setting, brightness control unit 13 can start cooling measure.Also can measure the light decay curve of LED through it, or regulate the operating current of LED with temperature according to known LED light decay curve.
Should be appreciated that Fig. 4 shows the relation between led light source and the brightness control unit 13 with light-source structure shown in Fig. 3 A and Fig. 3 B, also can adopt light-source structure shown in Fig. 2 A and Fig. 2 B during practical implementation, control principle such as Fig. 4 are identical, repeat no more here.
The temperature sensor 3 of the enclosure interior of LED shown in Figure 4 system is placed on the brightness control unit 13 with light sensor 4; Can obtain LED system architecture shown in Figure 5; Be applicable to that illumination relies on the occasion of LED system environmental factor of living in; Temperature sensor 3 detects the parameter that reflects that environment temperature and illuminance change with light sensor 4; Can regulate illuminated ambient brightness or keep illuminated ambient brightness constant by the operating current of brightness control unit 13 control led chips 2 according to its variation, or control cooling operation.When temperature sensor 3 and light sensor 4 are far away apart from control module, can use bus form to carry out temperature and the transmission of illuminance signal.Wherein, meet design requirement, secondary lens 7 can be installed on housing 6, also can for the perhaps a plurality of LED combinations of each LED optical element 8 be set on the led chip or near led chip for helping led chip 2 luminous beams.
In sum; Can adopt one or more self-luminous parameters that led light source temperature inside sensor 3 and/or light sensor 4 detect led light source 11 that are built in during practical implementation; Also can adopt one or more parameters that place outside temperature sensor 3 of led light source and/or light sensor 4 to detect led light source 11 environment of living in; Or detect the self-luminous parameter and the ambient parameter of led light source 11 simultaneously; And brightness control unit 13 can be selected the brightness through led drive circuit 132 adjustment led light sources 11 according to testing result, also can control cooling module 133 processings of lowering the temperature, or adjust led light source 11 brightness and cooling processing simultaneously.
In the embodiment of the invention, the control module 131 in the brightness control unit 13 can be based on digital circuit, and is as shown in Figure 6, also can be based on analog circuit, and as shown in Figure 7.
With reference to Fig. 6; Control module 131 can be single-chip microcomputer, PLD or other digital control chips and circuit; If voltage, current signal from temperature sensor 3 and/or light sensor 4 are data signal, then can be directly inputted into control module 131; If voltage, current signal from temperature sensor 3 and/or light sensor 4 are analog signal; Then need pass through A/D change-over circuit 136 carries out inputing to control module 131 after mould/number conversion; If control module 131 is selected the single-chip microcomputer that carries mould/number conversion function for use, also can change voluntarily by this single-chip microcomputer.As when the sensor that uses is reflected in temperature or illuminance on the resistance characteristic; Available another measuring resistance series connection dividing potential drop; The resistance value relevant with temperature or illuminance converted to and temperature or the relevant magnitude of voltage of illuminance, and this magnitude of voltage is analog signal.For the signal of avoiding numerical portion and analog part disturbs; Analog signal from temperature sensor 3 and/or light sensor 4 should be passed through isolator 134 earlier; Isolator 134 can the selective light electric isolating circuit or based on voltage follower circuit or other buffer circuit of operational amplifier; The output of isolator 134 is connected with amplifying circuit 135; Act as make amplifying signal be in A/D change-over circuit 136 valid interval in and have enough resolution ratio, amplifying circuit 135 can be based on the ratio amplifying circuit of operational amplifier.Signal through isolation, amplification, mould/number conversion sends control module 131 to; If the temperature sensor 3 and/or the light sensor 4 that use are integrated digital chips, then sensor chip and control module 131 directly can be carried out transfer of data according to certain communication protocol.
The internal processes of control module 131 is handled according to the temperature and the monochrome information that collect accordingly, and can pass through display 137 (like charactron or LCD screen) demonstration, also can carry out function selecting through keystroke interface 138.The processing that control module 131 is carried out can be when temperature surpasses a threshold value, provides on-off circuit 139 start signal, thereby opens cooling module 133, like fan or water circulation.On-off circuit 139 can be based on controllable silicon, also can be based on the circuit of relay or other switching device; The processing that control module 131 is carried out; It also can be the operating current that changes led light source 11 chips; Control module 131 is judged the size of current that will change according to signal and/or the light decay curve gathered earlier; Carry out digital-to-analogue conversion through D/A change-over circuit 1310, control led drive circuit 132 changes the brightness of led light source 11.Wherein digital-to-analogue conversion can be that D/A change-over circuit 1310 also can be that control module 131 provides PWM (pulsewidth modulation) signal, gives led drive circuit 132, thereby changes the condition of work of led light source.The LED driving power that led drive circuit 132 preferential selections are made up of PWM formula Switching Power Supply; Its pwm signal is provided by single-chip microcomputer; Change the output driving current of Switching Power Supply by pwm signal, led drive circuit 132 also can be the electric current led drive circuit that other components and parts are formed certainly.
With reference to Fig. 7, control module 131 comprises first comparison circuit 1311 and second comparison circuit 1312 based on comparison circuit, and temperature sensor 3 and/or light sensor 4 are not selected integrated chip for use.Comparison circuit can be the comparison circuit that voltage comparator is formed, the comparison circuit that also can be made up of a plurality of triodes.The electrical signal conversion of being obtained by temperature sensor 3 and/or light sensor 4 becomes the analog voltage signal in the proper range, be input to the in-phase input end of first comparison circuit 1311, and reference voltage is imported the inverting input of first comparison circuit 1311.Reference voltage can be that external power source provides, and also can be that electric resistance partial pressure provides or other method provides.When analog signal during, first comparison circuit, 1311 output high level (or low level) greater than reference voltage, when analog signal during less than reference voltage, comparison circuit output low level (or high level).The output level of first comparison circuit 1311 can be used for direct gauge tap circuit 134 (like relay or other switching device) and turn on and off, so that open or close cooling module 133.The output level of first comparison circuit 1311 also can be used for controlling the led drive circuit 132 of led light source 11, when ambient lighting is not enough, opens led drive circuit 132, makes led light source 11 work.
In the embodiment of the invention; Through self-luminous parameter at the inner detection of led light source led light source; Or through ambient parameter at led light source external detection led light source; The luminosity of lowering the temperature in real time and handling or adjusting led light source, thus the constant or LED lighting environment brightness constancy of LED luminosity guaranteed, also prolonged the service life of LED simultaneously to a certain extent.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a LED system comprises led light source, it is characterized in that, said LED system also comprises:
Detect the self-luminous parameter of said led light source and/or the detecting unit of ambient parameter; And
Brightness control unit is connected with said detecting unit, to the processing of lowering the temperature of said led light source environment of living in, and/or adjusts the brightness of said led light source according to the testing result of said detecting unit;
Said brightness control unit comprises:
The control module that is connected with said detecting unit;
The led drive circuit and/or the cooling module that are connected with said control module;
Said control module is controlled said led drive circuit according to the testing result of said detecting unit and is adjusted said led light source brightness; And/or control said cooling module to the processing of lowering the temperature of said led light source environment of living in according to the testing result of said detecting unit;
Be connected with isolator, amplifying circuit, A/D change-over circuit between said detecting unit and the said control module in turn; Be connected with on-off circuit between said control module and the said cooling module; Be connected with the D/A change-over circuit between said control module and the said led drive circuit.
2. LED as claimed in claim 1 system is characterized in that, places said led light source inner during the self-luminous parameter of the said led light source of said detection; Said detecting unit comprises temperature sensor and/or light sensor, and said temperature sensor and/or light sensor are connected with said brightness control unit.
3. LED as claimed in claim 2 system is characterized in that said led light source comprises:
Chip holder;
Be installed on the one or more led chips on the said chip holder;
Said led light source outside is equipped with housing;
Said temperature sensor is installed on the said chip holder; Said light sensor is installed on the said chip holder or said inner walls.
4. LED as claimed in claim 2 system is characterized in that said led light source comprises:
Chip holder;
Be installed on the one or more led chips on the said chip holder;
Said chip holder is installed on the support body;
Said led light source outside is equipped with housing;
Said temperature sensor is installed on the said chip holder or on the support body; Said light sensor is installed on the said chip holder, on the support body or said inner walls.
5. like claim 3 or 4 described LED systems, it is characterized in that said shell is equipped with and makes said led chip luminous beam concentrate on the secondary lens in the predetermined angular.
6. like claim 3 or 4 described LED systems, it is characterized in that said chip holder is provided with the optical element that the light that makes led chip arrives said light sensor.
7. LED as claimed in claim 1 system is characterized in that, places said led light source outside during the ambient parameter of the said led light source of said detection; Said detecting unit comprises temperature sensor and/or light sensor, and said temperature sensor and/or light sensor are connected with said brightness control unit.
8. LED as claimed in claim 1 system is characterized in that said brightness control unit also comprises an on-off circuit and/or triode;
Said control module comprises:
First comparison circuit; Its in-phase input end receives the analog electrical signal of said detecting unit; Its inverting input receives a reference signal, and output is connected with said cooling module through said on-off circuit, is used for more said analog electrical signal and said reference signal; And control said on-off circuit according to comparative result and turn on and off processing so that said heat sink is lowered the temperature; And/or
Second comparison circuit; Its in-phase input end receives the analog electrical signal of said detecting unit; Its inverting input receives a reference signal; Output is connected with the base stage of said triode, is used for more said analog electrical signal and said reference signal, and controls said led drive circuit according to comparative result and adjust said led light source brightness; The colelctor electrode of said triode is connected grounded emitter with said led drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810241259XA CN101749567B (en) | 2008-12-16 | 2008-12-16 | LED system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810241259XA CN101749567B (en) | 2008-12-16 | 2008-12-16 | LED system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101749567A CN101749567A (en) | 2010-06-23 |
| CN101749567B true CN101749567B (en) | 2012-03-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810241259XA Expired - Fee Related CN101749567B (en) | 2008-12-16 | 2008-12-16 | LED system |
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| CN (1) | CN101749567B (en) |
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| CN102045920A (en) * | 2010-08-25 | 2011-05-04 | 李志明 | System for intelligently controlling energy efficiency of LED lighting source |
| CN102005181B (en) * | 2010-11-19 | 2012-09-05 | 深圳市立翔慧科光电科技有限公司 | Standard dot matrix light source and image point correction method of LED display screen |
| CN102131331A (en) * | 2011-02-24 | 2011-07-20 | 复旦大学 | Weber's-law-based light-emitting diode (LED) control circuit |
| JP6113417B2 (en) * | 2011-04-22 | 2017-04-12 | アイリスオーヤマ株式会社 | LED lamp |
| CN102332528A (en) * | 2011-10-08 | 2012-01-25 | 滨州市甘德电子科技有限公司 | Equal-life heat dissipation method for arrayed LEDs (light-emitting diode) |
| CN102427647A (en) * | 2011-12-16 | 2012-04-25 | 广东朗视光电技术有限公司 | Illuminating lamp capable of automatically regulating brightness and light color |
| CN102595732B (en) * | 2012-02-27 | 2014-10-15 | 西南科技大学 | LED (light-emitting diode) temperature control method and system based on PWM (pulse width modulation) |
| CN102611776A (en) * | 2012-03-02 | 2012-07-25 | 广东步步高电子工业有限公司 | Keyboard LED (Light Emitting Diode) state display module applied to cell phone and control method thereof |
| DE102012101818B4 (en) * | 2012-03-05 | 2018-11-08 | Osram Opto Semiconductors Gmbh | Optoelectronic module with a coding element in a recess, illumination device with this module and method for its production |
| TWI495079B (en) * | 2012-03-06 | 2015-08-01 | Lighten Corp | Light-emitting module |
| CN103813564A (en) * | 2012-11-05 | 2014-05-21 | 海洋王（东莞）照明科技有限公司 | Lamp and protection circuit thereof |
| WO2014117398A1 (en) * | 2013-02-04 | 2014-08-07 | Lee Wen-Sung | Intelligent lighting device |
| CN104936334B (en) * | 2014-03-20 | 2018-03-27 | 联想(北京)有限公司 | Lamp light control method and device |
| CN105221937A (en) * | 2014-06-20 | 2016-01-06 | 宁波舜宇光电信息有限公司 | Led light source |
| CN105050277A (en) * | 2015-08-07 | 2015-11-11 | 苏州晶雷光电照明科技有限公司 | Intelligent lighting device |
| CN106163005B (en) * | 2016-08-02 | 2018-07-24 | 中山市祥久照明电器有限公司 | A kind of overheat protector LED drive power |
| CN107750073A (en) * | 2017-11-01 | 2018-03-02 | 合肥艾斯克光电科技有限责任公司 | One kind is based on PWM light modulating LED light fixture wireless control systems |
| CN110972353A (en) * | 2018-09-27 | 2020-04-07 | 昆山科技大学 | Active LED light source processor |
| CN113129808B (en) * | 2019-12-31 | 2022-12-09 | Tcl科技集团股份有限公司 | Driving method and driving device of LED array and display device |
| CN112233624A (en) * | 2020-10-16 | 2021-01-15 | 上海华东汽车信息技术有限公司 | Backlight processing method, medium and device for instrument panel and vehicle |
| CN114321753A (en) * | 2022-01-14 | 2022-04-12 | 厦门雅而坦照明有限公司 | LED lamp with illumination intensity capable of being automatically adjusted |
| CN117062270B (en) * | 2023-08-03 | 2024-03-29 | 广州港申新材料有限公司 | Self-adaptive control luminous LED (light emitting diode) board and control method |
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| CN101749567A (en) | 2010-06-23 |
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