CN107094327B - Temperature stable LED irradiation system and LED - Google Patents
Temperature stable LED irradiation system and LED Download PDFInfo
- Publication number
- CN107094327B CN107094327B CN201710048781.5A CN201710048781A CN107094327B CN 107094327 B CN107094327 B CN 107094327B CN 201710048781 A CN201710048781 A CN 201710048781A CN 107094327 B CN107094327 B CN 107094327B
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- led
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- temperature sensor
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- 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
Abstract
Provide a kind of LED irradiation system that temperature is stable.The system includes LED.Temperature sensor is arranged to the temperature near sensing LED.The circuit for being couple to the temperature sensor and the LED is configured as being adjusted to the power of the LED based on the temperature sensed.
Description
Cross reference to related applications
The application based on and require that on 2 18th, 2016 U.S. Provisional Patent Application No.62/296,776's submitted is excellent
It first weighs, content is completely incorporated herein by reference.
Technical field
The present invention relates to lighting areas, more particularly, to a kind of LED irradiation system and LED that temperature is stable.
Background technique
Online wet-chemical analysis instrument is for the continuous instruction in various industry with offer to the analyte in process sample.It should
Continuous instruction can be provided locally by analyzer and/or be remotely supplied to one or more suitable equipment, in order to provide
Control and/or monitoring to chemical process.
A kind of concrete type of online wet-chemical analysis instrument is online silica analyzer.These equipment are configured as
Reaction is generated in process sample, allows to determine the instruction of the silica in sample.This analyzer can be used for determining boiler
Dioxide-containing silica in water, boiler feedwater, softened water and steam condensate.Although this analyzer is to have in various industry
, but they are particularly suitable for power plant boiler.In such systems, silica can form silicate deposit object,
Turbine and other generating equipments used in water-steam turbine cycle may be damaged.Therefore, with the power generation of high-pressure turbine
Factory usually carefully monitors silica, to ensure effectively detection and removal/reparation.One of online silica analyzer
Specific example is the trade name sold by Rosemount Analytical, Emerson Automation Solutions company
Claim the silica analyzer of model CFA3030.
Online silica analyzer will usually use known reaction, make it possible in easily detection process sample
Silica.One example of this reaction is referred to as molybdenum blue method.In the molybdenum blue method, molybdate (usually potassium molybdate
Form) for the silicon dioxde reaction in process sample/solution, be suitable for the compound of colorimetric detection to generate.According to molybdenum
Blue party method measures the dioxide-containing silica in water based on the color of the silicomolybdic acid formed by wet-chemical process.
Summary of the invention
Provide a kind of LED irradiation system that temperature is stable.The system includes LED.Temperature sensor is arranged to sense
Temperature near the LED.The circuit for being couple to the temperature sensor and the LED is configured as based on the temperature sensed
To be adjusted to the power of the LED.
When reading following detailed description and checking associated attached drawing, these of embodiment claimed are characterized
It will become obvious with various other feature and advantage.
Detailed description of the invention
Fig. 1 shows a part of colorimetric analyzer according to an embodiment of the present invention.
Fig. 2A is to show irradiation level according to an embodiment of the present invention to the chart of temperature.
Fig. 2 B is to show irradiation level according to an embodiment of the present invention to the chart of electric current.
Fig. 3 A to Fig. 3 B shows LED circuit according to an embodiment of the present invention.
Fig. 4 shows the flow chart of the method according to an embodiment of the present invention for LED control.
Specific embodiment
This disclosure relates to a kind of light emitting diode (LED) for keeping constant irradiation level during temperature change.Various colorimetrics
Light needed for wet-chemical analysis instrument generates colorimetric measurement using LED.LED generates light using the electron stream across p-n junction.
When with constant current driven, the irradiation level of LED is the function of the temperature (i.e. the temperature of LED substrate (tube core)) of the environment of LED.
It is especially true when LED emits the light of closer infrared light (IR) spectrum.In many cases, irradiation level these be based on temperature
The variation of degree can be acceptable the user of LED.However, in some applications, such as colorimetric analyzer, this variation
It may cause measurement error.
When LED is used as the light source of colorimetric analyzer, the luminous intensity of light source with the temperature for the environment for placing analyzer and
Variation.Absorptivity A is provided in following equation 1:
A=-log10 (I/I0) equation 1
Wherein I is the luminous intensity measured when color has shown after reacting, and I0It is to be surveyed before Color development
The luminous intensity of amount.During the operation of wet-chemical analysis instrument, luminous intensity this is measured occur at different times twice.If
Environment temperature changes during process and the if (I/I that LED with constant current driven, is measured0) calculating will include by
Error caused by dependence of the irradiation level to temperature.
Fig. 1 shows a part of colorimetric analyzer according to an embodiment of the present invention.Colorimetric analyzer 100 can be used for leading to
Crossing makes illumination 104 pass through liquid 108 to analyze the liquid 108 for being located at and surveying in light unit 106.LED 102 is generated across liquid 108
And the illumination 104 detected by optical sensor 110.Optical sensor 110 can be any sensor of the characteristic of detection light, including but
It is not limited to colorimeter, spectral radiometer, spectrophotometer or densitometer.
In order to compare the multiple measurement carried out by colorimetric analyzer 100, illumination 104 must be consistent.If between measurements
There are the variations of illumination 104, then must be adjusted to the variation, and otherwise the comparison between measurement will be inaccurate.Show in Fig. 2A
The problem of having gone out LED.Chart 200 has the X-axis 202 for indicating temperature and indicates the Y-axis 204 of irradiation level.Trendline 206 is shown
As the temperature of LED increases, how the irradiation level of LED is reduced.
One solution of the problem is, if temperature changes, liquid 108 is discharged from survey light unit 106 and surveys
Not blocked illumination 104 is measured as controlling value.Then, while keeping temperature, survey light unit is refilled with liquid 108
106, illumination 104 was projected into liquid 108 and measurement experiment value.It is then possible to pass through controlling value regulation experiment value.This is a kind of
Feasible solution, but there is the cost for draining-refilling, and adjust measurement in 104 value of illumination based on variation
A possibility that mistake is also increased during value.
A kind of better solution is, with temperature change, it is ensured that the illumination 104 generated by LED 102 is kept constant.
The irradiation level of LED is not only determined by temperature.Fig. 2 B is to show irradiation level according to an embodiment of the present invention to the chart of electric current.
Chart 250 has the X-axis 252 for indicating electric current and indicates the Y-axis 254 of irradiation level.Trendline 256 is shown with being supplied to LED
Electric current increase, how the irradiation level of LED to increase.It, can for the irradiation level for keeping constant LED in the temperature environment of variation
To change the electric current for being supplied to LED.For example, as temperature increases, the electric current also irradiation level by that must increase to keep constant.
Fig. 3 A shows LED circuit according to an embodiment of the present invention.LED circuit 300 includes LED 302, LED drive circuit
304, feed circuit 308 and temperature sensor 306.Temperature sensor 306 is arranged to sense the temperature near LED 302.Temperature
Degree sensor 306 can be any suitable structure with the electrical characteristics varied with temperature.Example includes resistance temperature detection
Device (RTD), thermocouple, thermistor etc..In one embodiment, temperature sensor 306 can use radiator and be couple to LED
302 tube cores/substrate.
Temperature sensor 306 is couple to feed circuit 308, and feed circuit 308 provides signal to LED drive circuit 304.Instead
Current feed circuit 308 and/or driving circuit 304 may be implemented as any combination of number or analog circuit.For example, feed circuit
308 can be used the microcontroller with analog-digital converter to realize, which receives from temperature sensor 306
Signal simultaneously provides the digital indication of temperature.Then, which can be used to calculate by LED drive circuit 304 and adjustment mentions
The power of LED 302 is supplied, to control irradiation level based on measured temperature.In one embodiment, LED drive circuit
304 and feed circuit 308 be single circuit component.
Although implementation shown in Fig. 3 A is illustrated the temperature sensor 306 isolated with LED 302, it is expressly contemplated that
It is that can practice a part or the embodiment being arranged in LED encapsulation that temperature sensor is LED 302.Fig. 3 B shows one
A embodiment, wherein LED drive circuit 304, feed circuit 308 and temperature sensor 306 are arranged in LED 302.However, this
Any one of a little components can be separated with LED 302.
Fig. 4 shows the flow chart of the method according to an embodiment of the present invention for LED control.Irradiation level stablizes 400 packets
Include three steps.In frame 402, temperature is measured near LED.In one embodiment, temperature measurement is carried out in LED.
In frame 404, power adjustment is calculated.The calculating of power adjustment uses the temperature measured in frame 402 as input.?
In one embodiment, which includes the temperature from manufacturer to irradiance data.In another embodiment, the calculating includes
Temperature-the radiation constant being multiplied with the temperature of measurement.
In frame 406, the power of LED is adjusted to using the calculating from frame 404.It can be by with number and/or simulation
Circuit that any combination of circuit is realized carries out the adjustment.It, can be with repetitive cycling simultaneously after adjustment is supplied to the power of LED
And the power of offer is continuously adjusted to compensate any temperature variation.
Although referring to preferred embodiment, invention has been described, it will be recognized by those skilled in the art
It is that without departing from the spirit and scope of the present invention, modification in form and details may be implemented.
Claims (10)
1. a kind of LED irradiation system that temperature is stable, comprising:
LED；
Temperature sensor is disposed in the LED to sense the temperature near the LED；And
Circuit is couple to the temperature sensor and is arranged in the LED, and the circuit is configured as based on temperature sensor
Signal calculates power adjustment, wherein the circuit is configured as being adjusted to the LED's based on power adjustment calculated
Power, so that the LED maintains virtually constant irradiation level.
2. the stable LED irradiation system of temperature according to claim 1, which is characterized in that the LED is colorimetric analyzer
In light source.
3. the stable LED irradiation system of temperature according to claim 1, which is characterized in that by controlling to the LED's
Electric current adjusts power.
4. the stable LED irradiation system of temperature according to claim 1, which is characterized in that the circuit includes: digital electricity
Road component and artificial circuit component.
5. a kind of Light-emitting diode LED, the LED include:
Temperature sensor is arranged in the LED, wherein the temperature sensor is configured as sensing the temperature in the LED,
Wherein the temperature sensor is configured as substantially only sensing the temperature of specific LED；And
Feed circuit, is arranged in the LED and is couple to the temperature sensor, and the feed circuit is configured as based on institute
Power adjustment needed for the temperature computation of sensing maintains the irradiation level of the LED；And
Driving circuit is arranged in the LED, is configured as adjusting based on power adjustment calculated and is supplied to the LED
Power, wherein the driving circuit is configured as substantially only providing power to the specific LED.
6. LED according to claim 5, which is characterized in that the temperature sensor is couple to the LED by radiator
P-n junction.
7. LED according to claim 5, which is characterized in that the temperature sensor includes thermocouple.
8. LED according to claim 5, which is characterized in that the temperature sensor includes resistance temperature detector.
9. LED according to claim 5, which is characterized in that the circuit includes: digital circuit components and analog circuit group
Part.
10. LED according to claim 5, which is characterized in that the LED is configured as providing in wet-chemical analysis instrument
Illumination.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201662296776P | 2016-02-18 | 2016-02-18 | |
| US62/296,776 | 2016-02-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107094327A CN107094327A (en) | 2017-08-25 |
| CN107094327B true CN107094327B (en) | 2019-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710048781.5A Active CN107094327B (en) | 2016-02-18 | 2017-01-22 | Temperature stable LED irradiation system and LED |
| CN201720083885.5U Expired - Fee Related CN206851073U (en) | 2016-02-18 | 2017-01-22 | The LED irradiation systems and LED of temperature stabilization |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720083885.5U Expired - Fee Related CN206851073U (en) | 2016-02-18 | 2017-01-22 | The LED irradiation systems and LED of temperature stabilization |
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| CN (2) | CN107094327B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107094327B (en) * | 2016-02-18 | 2019-01-25 | 罗斯蒙特公司 | Temperature stable LED irradiation system and LED |
| CN108521692A (en) * | 2018-03-21 | 2018-09-11 | 深圳市富满电子集团股份有限公司 | The temprature control method and LED illumination System of LED illumination System |
| CN111463336B (en) * | 2020-05-11 | 2021-06-22 | 福建省信达光电科技有限公司 | Preparation method of LED lamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100454105C (en) * | 2004-07-12 | 2009-01-21 | 索尼株式会社 | Display unit and backlight unit |
| CN201491346U (en) * | 2009-09-01 | 2010-05-26 | 福建科维光电科技有限公司 | Temperature compensation circuit of LED lamp |
| CN201774714U (en) * | 2010-07-30 | 2011-03-23 | 湖州海振电子科技有限公司 | Intelligent automatic temperature-control high power light emitting diode (LED) street lamp control circuit |
| CN102843835A (en) * | 2012-08-28 | 2012-12-26 | 江苏索尔光电科技有限公司 | LED (light-emitting diode) street lamp control device based on solar electroplate |
| CN103574544A (en) * | 2013-11-25 | 2014-02-12 | 奇瑞汽车股份有限公司 | LED automobile lamp driving system and control method thereof |
| CN206851073U (en) * | 2016-02-18 | 2018-01-05 | 罗斯蒙特分析公司 | The LED irradiation systems and LED of temperature stabilization |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE502005006894D1 (en) * | 2004-09-14 | 2009-04-30 | Fraunhofer Ges Forschung | METHOD OF MEASURING AT LEAST ONE GAS COMPONENT |
| US8514210B2 (en) * | 2005-11-18 | 2013-08-20 | Cree, Inc. | Systems and methods for calibrating solid state lighting panels using combined light output measurements |
| US9338851B2 (en) * | 2014-04-10 | 2016-05-10 | Institut National D'optique | Operation of a LED lighting system at a target output color using a color sensor |
-
2017
- 2017-01-22 CN CN201710048781.5A patent/CN107094327B/en active Active
- 2017-01-22 CN CN201720083885.5U patent/CN206851073U/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100454105C (en) * | 2004-07-12 | 2009-01-21 | 索尼株式会社 | Display unit and backlight unit |
| CN201491346U (en) * | 2009-09-01 | 2010-05-26 | 福建科维光电科技有限公司 | Temperature compensation circuit of LED lamp |
| CN201774714U (en) * | 2010-07-30 | 2011-03-23 | 湖州海振电子科技有限公司 | Intelligent automatic temperature-control high power light emitting diode (LED) street lamp control circuit |
| CN102843835A (en) * | 2012-08-28 | 2012-12-26 | 江苏索尔光电科技有限公司 | LED (light-emitting diode) street lamp control device based on solar electroplate |
| CN103574544A (en) * | 2013-11-25 | 2014-02-12 | 奇瑞汽车股份有限公司 | LED automobile lamp driving system and control method thereof |
| CN206851073U (en) * | 2016-02-18 | 2018-01-05 | 罗斯蒙特分析公司 | The LED irradiation systems and LED of temperature stabilization |
Also Published As
| Publication number | Publication date |
|---|---|
| CN206851073U (en) | 2018-01-05 |
| CN107094327A (en) | 2017-08-25 |
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Effective date of registration: 20190108 Address after: Minnesota, USA Applicant after: Rosemount Inc. Address before: California, USA Applicant before: Rosemount is analyzed company |
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