CN101793359A - LED lamp capable of constant light emitting and working method thereof - Google Patents
LED lamp capable of constant light emitting and working method thereof Download PDFInfo
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- CN101793359A CN101793359A CN201010109555A CN201010109555A CN101793359A CN 101793359 A CN101793359 A CN 101793359A CN 201010109555 A CN201010109555 A CN 201010109555A CN 201010109555 A CN201010109555 A CN 201010109555A CN 101793359 A CN101793359 A CN 101793359A
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Abstract
The invention discloses an LED lamp capable of constant light emitting and a working method thereof. The LED lamp comprises an LED, a heat sink, a heater and a drive control circuit, wherein the LED comprises two or more LED chips and is contacted with the heat sink; the heat sink is contacted with the heater; the drive control circuit provides constant current power to the LED and monitors the forward junction voltage of the single chip or a plurality of LED chips; and when the forward voltage of the LED lamp varies, the heater controls the junction temperature of the LED by increasing or reducing the heating-up capacity, thus stabilizing the forward voltage of the LED and further keeping constant light emitting of the LED. Constant light emitting of the LED lamp formed by a plurality of LED chips is realized by the heating method and the junction temperature of the LED is easy to control, thus effectively realizing stable light emitting of the LED. The invention is especially suitable for applications with high requirements for optical radiation measurement and the like.
Description
Technical field
The present invention relates to a kind of LED lamp, be specifically related to a kind of constant luminous LED lamp of in optical radiation measurement, using as standard sources.
Background technology
Standard sources is to carry out transmission of quantity value in the optical radiation measurement, guarantees the important utensil of certainty of measurement.The essential characteristic of standard sources is luminous stable, the repdocutbility height.For various measurement demand, the specific requirement of standard sources also is not quite similar, for example measure occasion at some, require standard sources to have wide spectrum continuous distributed, and require standard sources to have the narrower monochromatic light of spectrum in some occasion.
What be used as standard sources at present mainly is the lamp of spectral region broad, as incandescent lamp, xenon lamp etc.In order to realize monochromatic standard sources, generally be to adopt the lamp of these wide spatial distribution to add monochromatic filter.Yet the light transmittance of colour filter is very responsive to temperature, particularly between in use under the long situation, and the monochromatic light instability of Chan Shenging in this way.
Along with the continuous development of LED technology, use LED to become possibility as standard lamp.Single-chip LED has abundant monochromatic spectrum, and the plurality of LEDs chip can make up mutually, produce continuous wide spectral light radiation, and the spectrum composition is adjustable.Have at present and recommend to use LED to calibrate measuring system in the relevant standard of some LED optical radiation measurements as standard sources.
But LED exists the characteristic very responsive to temperature equally, and spectrum that LED is luminous and intensity all can be along with its PN junction variation of temperature takes place by significant the variation.In order to make LED keep stabilized illumination, reach requirement as standard sources, existing LED standard lamp is all with a LED and bigger heat sink contacting, and what have also is connected with refrigerating plant (or active heat removal device), so that the junction temperature of LED does not take place significantly to rise.Yet this technology is very high to heat sink requirement on the one hand; On the other hand, refrigerating plant or active heat removal device are relatively large and effect is not ideal enough to the realization difficulty of technology.Therefore make the LED standard lamp that produces in this way generally bulky, and if manufacturing process is bad, the stability of photoluminescence that is reached is not high yet, the difficulty of bringing for the application of LED standard lamp.
Summary of the invention
In order to overcome the defective of prior art, the present invention aims to provide a kind of small size that is easy to realize, constant luminous LED standard lamp.
The present invention is achieved by the following technical solutions: a kind of constant luminous LED lamp, it is characterized in that: comprise LED, heat sink, heater and Drive and Control Circuit, above-mentioned LED contacts with heat sink, above-mentioned heater contacts with heat sink, above-mentioned LED is electrically connected with Drive and Control Circuit, and above-mentioned heater is electrically connected with Drive and Control Circuit.
Among the present invention, employing is heated but not the mode of refrigeration realizes the control to the LED junction temperature, to keep the stabilized illumination of LED.When real work, heat sink by the heater heating, LED is worked under than higher environment temperature, and Drive and Control Circuit is monitored the work of the forward voltage and the control heater of one or more led chips, when ascendant trend appears in the forward voltage of the led chip of monitoring, heater increases, the PN junction temperature of LED is risen, forward voltage descends, thereby realizes stablizing the PN junction temperature, and is opposite, when downward trend appears in the forward voltage of led chip, heater reduces heating, thereby the PN junction temperature of LED is descended, and stablizes the luminous effect of LED.Described LED is less than its pairing conventional rated operational current of using, for example can be slightly larger than starting current, this moment, forward current relatively relaxed with the rising of forward voltage, because input power is less, the electrical power that changes into heat energy is also smaller, PN junction temperature rise at work is also smaller, therefore than being easier to control the PN junction temperature.Compare with refrigeration modes, heating realizes than being easier to, and the effect of effect is very fast, and temperature is controlled comparatively simple, and structure is also fairly simple, and the volume of whole constant luminous LED lamp is significantly reduced.
The present invention can also be limited by following technical scheme and be perfect:
Have two or two above led chips among the above-mentioned LED.In actual applications, can select the led chip work of suitable number as required, have more intense flexibility.
Among the above-mentioned LED, the LED periphery is coated with fluorescent material, and fluorescent material is subjected to after the optical excitation that LED sends luminous.At the peripheral coating fluorescent powder of LED, can change the luminescent spectrum of LED integral body, make the photochromic more horn of plenty of LED lamp.For example be coated with yellow fluorescent powder on the led chip of blue light-emitting, produce the LED lamp that emits white light.
Above-mentioned LED, heat sink, heater and Drive and Control Circuit become one on frame for movement, and the constant luminous LED lamp operation that forms like this is more convenient, but volume may be bigger, limited its application.Therefore, constant luminous LED lamp of the present invention can adopt the technical scheme of following frame for movement: LED, heat sink and heater to become one, and described Drive and Control Circuit is independent mutually with described LED, and Drive and Control Circuit is electrically connected with LED (1) and heater by lead.
Comprise constant-current supply unit in the above-mentioned Drive and Control Circuit, the voltage measurement unit of the forward voltage of measurement LED and the temperature conditioning unit of control heater work to the LED power supply.Also may comprise a microprocessor in the Drive and Control Circuit, above-mentioned constant-current supply unit, voltage measurement unit and temperature conditioning unit all are electrically connected with microprocessor, are totally controlled their work by microprocessor.Drive and Control Circuit is the control centre of described constant luminous LED lamp, finishes to the power supply of LED with to the control of its PN junction temperature.
Above-mentioned temperature conditioning unit is the control module that adopts PID (PID) method control heater, and PID is comparatively simple and intelligent control method.Wherein the forward voltage of LED is the input quantity of PID, and the work of heater is the input quantity of PID.
Above-mentioned heater is that triode with heating function, diode, resistance or other can be converted into electric energy the components and parts or the parts of heat energy.
Among the above-mentioned LED two or two above chips are to be connected in series, and perhaps are connected in parallel the perhaps connection that combines of connection in series-parallel.
An above-mentioned heat sink and temp probe contacts, and the holding wire of temp probe is connected to described Drive and Control Circuit.This temp probe can be monitored heat sink temperature, thereby judges to a certain extent whether above-mentioned LED lamp is operated in normal condition.
A kind of method of work of constant luminous LED lamp, it is characterized in that the constant-current supply unit in the Drive and Control Circuit powers to the LED constant current, voltage measurement unit in the Drive and Control Circuit is monitored the forward junction voltage of one or more led chips simultaneously, when ascendant trend appears in the forward voltage of the led chip of being monitored, temperature conditioning unit control heater in the Drive and Control Circuit increases heating, and by heat sink to the LED heat temperature raising, on the contrary, when downward trend appears in the forward voltage of the led chip of being monitored, the temperature conditioning unit control heater reduces heating, and LED is lowered the temperature by heat sink, keep the forward voltage of LED stable with this, realize the constant luminous of LED lamp.
Junction temperature by the heat sink directly heating of heating LED lamp in the constant luminous method of maintenance of the present invention LED lamp by heating means but not the junction temperature of refrigerating method control LED lamp, thereby realizes keeping the constant luminous of LED lamp.
Described heater was in heated condition when above-mentioned LED worked, this state can guarantee that described heat sink temperature is higher than environment temperature, pass through this set, make and between LED lamp and the environment heat exchange takes place, make the LED junction temperature in the work decrease, thereby realize the purpose of heating control junction temperature.
The integro-differential method control of passing ratio is to heat sink heating.
In sum, the present invention realizes the constant luminous of LED lamp by heating means, and the heat effect effect is fast, controls the PN junction temperature than being easier to, thereby effectively controls the stabilized illumination of LED.
Description of drawings
Accompanying drawing 1 is the structural representation of a kind of constant luminous LED lamp of the present invention.
Accompanying drawing 2 is the structural representation of the constant luminous LED lamp of another kind of the present invention.
The specific embodiment
As Fig. 1 and Fig. 2 is two example structure schematic diagrames of constant luminous LED lamp of the present invention.
Embodiment 1:
Be illustrated in figure 1 as embodiment 1 schematic diagram, comprise many identical LED1, they are linked together with series system.Every LEDs 1 all contacts with a heater 3 again by substrate and one heat sink 2, described heat sink 2, a built-in again temp probe 5 in heat sink 2 simultaneously, and described LED1 and heater 3 all are electrically connected with Drive and Control Circuit 4.LED1, heat sink 2, heater 3 and Drive and Control Circuit 4 mechanically become one.Comprise constant-current supply unit 4-1 and voltage measurement unit 4-2 in the Drive and Control Circuit 4, can provide constant-current supply, monitor the forward voltage at series LED 1 two ends simultaneously for LED1.Described Drive and Control Circuit 4 also is electrically connected with heater 3, uses the work of PID temperature conditioning unit 4-3 control heater 3, and the temperature measurement unit 4-4 in the Drive and Control Circuit 4 is electrically connected with the holding wire of temp probe 5 simultaneously.Also comprise a microprocessor 4-5 in the Drive and Control Circuit 4, above-mentioned constant-current supply unit 4-1, voltage measurement unit 4-2, temperature conditioning unit 4-3 and temperature measurement unit 4-4 are electrically connected with microprocessor 4-5.
The constant luminous LED lamp of present embodiment is in when work, makes heat sink 2 the projecting environment temperature of temperature by heater 3.Constant current work under the control of the constant-current supply unit 4-1 of described led chip 1 in Drive and Control Circuit 4, continuous current is slightly larger than the starting current of led chip, voltage measurement unit 4-2 in the Drive and Control Circuit 4 monitors the forward voltage of led chip 2 simultaneously, and the value of forward voltage is input in the PID temperature conditioning unit work of control heater as input quantity.When ascendant trend appears in the forward voltage of led chip, temperature conditioning unit 4-3 heater increases heating, and by heat sink 2 pairs of LED heat temperature raisings, on the contrary, when downward trend appearred in the forward voltage of the led chip of being monitored, temperature conditioning unit 4-3 control heater reduced heating, and by heat sink LED was lowered the temperature, thereby the forward voltage of control led chip, the stabilized illumination of assurance LED lamp.The heat sink temperature of serviceability temperature probe monitoring, it is too high to place heat sink temperature, damages led chip.
Embodiment 2:
Be illustrated in figure 2 as the structural representation of the constant luminous LED lamp of embodiment 2.Comprise many identical LED1 in the present embodiment, they are linked together with series system.Every LEDs 1 all contacts with a heater 3 again by substrate and one heat sink 2, described heat sink 2, simultaneously a built-in again temp probe 5 in heat sink 2.Described LED1, heater 3 and temp probe 5 all are electrically connected with Drive and Control Circuit 4.Described LED1, heat sink 2 and heater 3 integrate, and Drive and Control Circuit 4 is external.Described LED1, heater 3 and temp probe 5 are similar with embodiment 1 by long lead, and Drive and Control Circuit 4 is monitored the forward voltage at series LED 1 two ends simultaneously for LED1 provides constant-current supply, simultaneously the work of control heater 3.
The working method of the constant luminous LED lamp of embodiment 2 is identical with embodiment 1.
Claims (10)
1. constant luminous LED lamp, it is characterized in that: comprise LED (1), heat sink (2), heater (3) and Drive and Control Circuit (4), described LED (1) contacts with heat sink (2), described heater (3) contacts with heat sink (2), described LED (1) is electrically connected with Drive and Control Circuit (4), and described heater (3) is electrically connected with Drive and Control Circuit (4).
2. constant luminous LED lamp according to claim 1 is characterized in that having two or two above led chips among the described LED (1).
3. constant luminous LED lamp according to claim 1 and 2 is characterized in that being coated with fluorescent material in described LED (1) periphery.
4. constant luminous LED lamp according to claim 1 and 2 is characterized in that described LED (1), heat sink (2), heater (3) and Drive and Control Circuit (4) become one on frame for movement; Perhaps described LED (1), heat sink (2) and heater (3) become one on frame for movement, and described Drive and Control Circuit (4) is independent mutually on frame for movement with described LED (1), and Drive and Control Circuit (4) is electrically connected with LED (1) and heater (3) by lead.
5. constant luminous LED lamp according to claim 1 and 2, it is characterized in that comprising in the Drive and Control Circuit (4) constant-current supply unit (4-1) to LED (1) power supply, measure the voltage measurement unit (4-2) of the forward voltage of LED (1), and the temperature conditioning unit (4-3) of control heater (3) work.
6. constant luminous LED lamp according to claim 5 is characterized in that described temperature conditioning unit (4-3) is the control module that adopts the PID method.
7. constant luminous LED lamp according to claim 2 is characterized in that among the described LED (1) two or two above chips are to be connected in series, and perhaps is connected in parallel, and what perhaps connection in series-parallel combined is connected.
8. constant luminous LED lamp according to claim 1 and 2 is characterized in that described heat sink (2) contact with a temp probe (5), and the holding wire of temp probe (5) is connected to described Drive and Control Circuit (4).
9. the method for work of a constant luminous LED lamp, it is characterized in that the constant-current supply unit (4-1) in the Drive and Control Circuit (4) powers to LED (1) constant current, voltage measurement unit (4-2) in the Drive and Control Circuit (4) is monitored the forward junction voltage of one or more led chips simultaneously, when ascendant trend appears in the forward voltage of the led chip of being monitored, temperature conditioning unit (4-3) control heater (3) in the Drive and Control Circuit (4) increases heating, and passes through heat sink (2) to LED (1) heat temperature raising; On the contrary, when downward trend appears in the forward voltage of the led chip of being monitored, temperature conditioning unit (4-3) control heater (3) in the Drive and Control Circuit (4) reduces heating, and by heat sink (2) LED (1) is lowered the temperature, and keeps the stable of LED (1) forward voltage with this.
10. the method for work of constant luminous LED lamp according to claim 9, described heater (3) is in heated condition when it is characterized in that described LED (1) work.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101095551A CN101793359B (en) | 2010-02-20 | 2010-02-20 | Working method of LED lamp capable of constant light emitting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101095551A CN101793359B (en) | 2010-02-20 | 2010-02-20 | Working method of LED lamp capable of constant light emitting |
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| CN101793359A true CN101793359A (en) | 2010-08-04 |
| CN101793359B CN101793359B (en) | 2013-03-13 |
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| CN2010101095551A Active CN101793359B (en) | 2010-02-20 | 2010-02-20 | Working method of LED lamp capable of constant light emitting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103797299A (en) * | 2011-07-22 | 2014-05-14 | 葛迪恩实业公司 | Heat management subsystems for led lighting systems, LED lighting systems including heat management subsystems, and/or methods of making the same |
| CN109963377A (en) * | 2017-12-22 | 2019-07-02 | 上海北汇信息科技有限公司 | A kind of Multicolor LED lamp and its control method and device |
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| CN1738507A (en) * | 2005-07-26 | 2006-02-22 | 潘建根 | Method for controlling LED light source junction temperature and made LED regulation light source |
| KR20060081902A (en) * | 2005-01-10 | 2006-07-14 | 엘지전자 주식회사 | Led driving circuit |
| CN101377902A (en) * | 2008-08-20 | 2009-03-04 | 青岛海信电器股份有限公司 | LED backlight module unit and temperature control method thereof |
| WO2009071314A2 (en) * | 2007-12-07 | 2009-06-11 | Osram Gesellschaft Mit Beschraenkter Haftung | Method and arrangement for adjusting a color location, and illumination system |
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2010
- 2010-02-20 CN CN2010101095551A patent/CN101793359B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060081902A (en) * | 2005-01-10 | 2006-07-14 | 엘지전자 주식회사 | Led driving circuit |
| CN1738507A (en) * | 2005-07-26 | 2006-02-22 | 潘建根 | Method for controlling LED light source junction temperature and made LED regulation light source |
| WO2009071314A2 (en) * | 2007-12-07 | 2009-06-11 | Osram Gesellschaft Mit Beschraenkter Haftung | Method and arrangement for adjusting a color location, and illumination system |
| CN101377902A (en) * | 2008-08-20 | 2009-03-04 | 青岛海信电器股份有限公司 | LED backlight module unit and temperature control method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103797299A (en) * | 2011-07-22 | 2014-05-14 | 葛迪恩实业公司 | Heat management subsystems for led lighting systems, LED lighting systems including heat management subsystems, and/or methods of making the same |
| CN109963377A (en) * | 2017-12-22 | 2019-07-02 | 上海北汇信息科技有限公司 | A kind of Multicolor LED lamp and its control method and device |
| CN109963377B (en) * | 2017-12-22 | 2021-03-23 | 上海北汇信息科技有限公司 | Multicolor LED lamp and control method and device thereof |
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| CN101793359B (en) | 2013-03-13 |
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