CN104459510B - A kind of LED array junction temperature quick online detection device - Google Patents
A kind of LED array junction temperature quick online detection device Download PDFInfo
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- CN104459510B CN104459510B CN201410802751.5A CN201410802751A CN104459510B CN 104459510 B CN104459510 B CN 104459510B CN 201410802751 A CN201410802751 A CN 201410802751A CN 104459510 B CN104459510 B CN 104459510B
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Abstract
The present invention relates to a kind of LED array junction temperature quick online detection device, including drive current source, temperature control box, light acquiring unit, multispectral information detecting unit and computer.Drive current source provides the driving current of the distinct pulse widths and amplitude needed for detection for LED array, temperature control box provides controllable environment temperature for LED array, light acquiring unit is designed with three kinds of forms, glitch-free light between more light sources in light acquiring unit acquisition LED array, it is supplied to multispectral information detecting unit, LED junction temperature is detected using spectroscopic methodology, the spectral information for obtaining each light source is transmitted to computer；Computer carries out the information that analysis draws the corresponding junction temperature of detected LED array to handling.The present invention is a kind of miniature portable, the LED array junction temperature detection device of low cost, is suitable for carrying out on-line quick detection to the LED array product junction temperature on production line, also can be used for carrying out fast and accurately spectral detection to other multiple light courcess points.
Description
Technical field
The present invention relates to one kind to minimize LED light electric detection means, and specifically a kind of LED array junction temperature is quickly online
Detection device.
Background technology
At present, large power white light LED is as a kind of New Solid lighting source, with traditional incandescent lamp, halogen tungsten lamp and glimmering
Light lamp source is compared, and has many advantages, such as energy conservation and environmental protection, small, long lifespan, anti-vibration, instantaneous starting.High power white light
LED becomes the development trend of modern illumination, be increasingly widely used in room lighting, road lighting, automotive lighting,
The various lighting areas such as floodlighting and plaza lighting, there is boundless development prospect.But the electric energy of LED is inputted, no
Light may be completely converted into, only about 30% can be converted into luminous energy release, and the energy for also having 70% or so can be converted into thermal energy, this
Partial heat energy needs to go out by heat transfer or heat radiation, if the radiator structure of chip does the heat bad, PN junction produces
It cannot shed in time, the temperature of chip will raise rapidly.LED junction temperature rise, can not only influence the photochromic electrical parameter of device,
Light efficiency is influenced, can more seriously influence the life and reliability of LED.
Common LED junction temperature detection method can be divided into two major classes：Contact type measurement and non-contact measurement.For tens of
To the LED shaped articles of hundreds of LED series parallel structures, its distinguishing feature is that power consumption is big, heat is concentrated, junction temperature is high.Shadow
The principal element for ringing heavy-power LED product property indices (such as luminous efficiency, luminosity, colourity) is LED under working status
The working junction temperature of each chip in product, and influence the key factor of LED product reliability and service life.Therefore, it is accurate to survey
The junction temperature of each chip has important practical significance in amount LED product.Work dissipating-heat environment when being worked independently due to LED and its
Working environment in the LED product of series parallel structure differs, therefore directly can not be used as string by the use of the working junction temperature of single LED
The working junction temperature of LED under parallel-connection structure, it is necessary to online inspection is carried out to the working junction temperature of each chips of LED directly in LED product
Survey, its working life could be effectively predicted, if using forward voltage method or reverse current in contact junction temperature detection method
, it is necessary to carry out contact type measurement to single LED when method is detected each LED junction temperature in LED array, LED array is destroyed
Integrality and work dissipating-heat environment during normal work, its test result can not also accurately reflect each during LED lamp normal work
The junction temperature of single LED.Therefore, forward voltage method is not suitable for detecting each junction temperature of chip in LED array with reverse current method.
Disclosed in December, 2009 China《A kind of detection method of LED illumination lamp chips junction temperature》In, (application number
For 200910055335.2), which carries out junction temperature measurement, phase by detecting the luminescence feature of LED with the rule of variations injunction temperature
For contact junction temperature measurement method, integrality of the LED array in detection process ensure that, more suitable for detecting LED
The junction temperature of each LED chip in array.But the spectral information without crosstalk of each LED how is quickly obtained, it is necessary to be studied.
It is 201110307991.4 in China Patent No.《LED lamp junction temperature measurement device》In, also disclose using inspection
The method progress junction temperature detection of spectrum is surveyed, which corresponds to a LED using an optical fiber, and LED, which is shone, to gather enters list
Channel spectrum instrument, when the luminescent spectrum for disposably obtaining four LED, it is necessary to which 4 spectrometers, then go to control by mechanical structure
Optical fiber movement processed, obtains the luminescent spectrum of other LED in array.This apparatus structure is complicated, with high costs, is unfavorable for low cost
Production application and the quick result detected.
The content of the invention
The purpose of the invention is to overcome the shortcomings of that current LED array junction temperature detection device is complicated, with high costs,
And providing one kind can solve the problems, such as present in existing junction temperature detection device, and it is simple in structure, cost is low, accurate quick, high
Imitate portable miniaturization LED array junction temperature quick online detection device.
To achieve these goals, the technical measures taken of the present invention are：A kind of LED array junction temperature is provided quickly to examine online
Survey device, including drive current source, temperature control box, light acquiring unit, multispectral information detecting unit and computer, the driving
Current source provides different pulse widths, the driving current of different amplitudes needed for detection for LED array；The temperature control box is
LED array provides controllable environment temperature, and the light acquiring unit is designed with three kinds of forms, is respectively light acquiring unit X, light
Acquiring unit Y, light acquiring unit Z；Glitch-free light between plurality of LEDs light source in light acquiring unit acquisition LED array, there is provided to more
Spectral information detection unit；The multispectral information detecting unit carries out junction temperature detection using spectroscopic methodology, obtains each light source
The spectral information of CCD, is sent in computer by spectral information by transmission line by interface；The computer passes through software
Analyzed and drawn after being handled the spectral information of the corresponding junction temperature of detected LED array.
The light acquiring unit X is saturating by diaphragm, collimating mirror, cemented doublet A, positive lens and the double gluings sequentially set
Camera lens B is formed, and the light that more aligned LED arrays are sent is by diaphragm, collimating mirror, transmission-type cemented doublet A, just
After lens, transmission-type cemented doublet B, the light that LED array is sent is reduced and is condensed to suitable spectral information detection unit detection
Size, there is provided give LED multispectral information detecting units, crosstalk do not produced between LED luminescent spectrums during reducing optically focused.
The light acquiring unit Y is by parabolic mirror, plane mirror, ellipsoidal mirror M, ellipsoidal mirror
N is formed, and the light that LED array is sent is after the light source colimated light system being made of parabolic mirror and ellipsoidal mirror with flat
Row light is emitted, and each road light does not produce crosstalk each other during reflection；Pass through again by ellipsoidal mirror M and ellipsoid
The spacing of multi beam directional light is narrowed down to suitable spectral information detection unit and examined by the beam-expanding system of speculum N compositions, beam-expanding system
The size of survey, each road light of LED does not produce crosstalk each other during reducing optically focused.
The light acquiring unit Z will be arranged in a row using the All-in-One bifurcation fiber for adding diaphragm after LED institutes emission collection
Row are supplied to the multispectral information detecting units of LED.
1~16 LED light source disposably collimated, is divided by the multispectral information detecting unit, focus on after,
The spectral information of non-interfering multiple light courcess is presented on spectrum face；The multispectral information detecting unit is by charge coupling device
The photosurface of CCD is placed on the imaging spectral face of grating, obtains the spectral information of multiple light courcess.
The multispectral information detecting unit uses full frame transfevent surface array charge-coupled device CCD, to spectral information
It is acquired, or and addition electronic shutter controls the break-make of light path in input path.
In heretofore described LED array LED chip light acquiring unit after light acquisition in output terminal by each light source point
A row close-packed arrays are carried out, and each light source point of output terminal does not produce crosstalk, is then fed into the multispectral information detecting units of LED and carries out
Spectrum disposably detects.
Main beam splitter used in heretofore described multispectral information detecting unit is flattened field concave grating, institute
The CCD of full frame transfevent with CCD, by mechanical shutter control light-path switch, when shutter is opened CCD to optical signal into
Row is photosensitive, and CCD carries out electric charge transfer when shutter closes, and can so obtain the spectral information of LED multi-path.
In technical scheme, the spectral information of CCD is sent in computer by interface, computer software into
After row processing, the spectral information that corresponding LED shines is drawn, junction temperature analysis and detection are carried out using spectroscopic methodology.
The present invention LED array junction temperature quick online detection device beneficial effect be：
1. the present invention provides a kind of portable, inexpensive LED array junction temperature detection device, be conducive to on production line
LED array product carries out quick junction temperature detection, can popularize each size LED manufacturers application.
2. the detection device of the present invention can be disposably by the spectral information dispersion without cross talk of multiple light courcess point
(Dispersion) on area array CCD, CCD once reads the spectral information that can obtain multiple light courcess point, therefore also can be used for it
Its multiple light courcess point carries out fast and accurately spectral detection.
Brief description of the drawings
Fig. 1 is the LED array junction temperature quick online detection apparatus structure schematic diagram of the present invention.
Fig. 2 is the structure diagram of smooth acquiring unit X used in the present invention a kind of.
Fig. 3 is the structure diagram of smooth acquiring unit Y used in the present invention a kind of.
Fig. 4 is the structure diagram of smooth acquiring unit Z used in the present invention a kind of.
Fig. 5 is the light path schematic diagram of optical spectroscopic element used in the multispectral information detecting unit of the present invention.
The light acquisition device that Fig. 6 is the present invention is incident on the spectrum picture produced on CCD in six road optical fiber at the same time.
Fig. 7 be the present invention pulsed drive under LED light spectrum peak wavelength with variations injunction temperature figure.
In above-mentioned figure：1-LED arrays, 2- temperature control boxs, 3- light acquiring unit, the multispectral information detecting units of 4-, 5- transmission
Line, 6- computers, 7- drive current sources；11- diaphragms, 12- collimating mirrors, 13- cemented doublet A, 14- positive lens, 15- are double glued
Lens B；21- parabolic mirrors, 22- plane mirrors, 23- ellipsoidal mirror M, 24- ellipsoidal mirrors N；31- cylinders
Shape diaphragm, 32- heads fibre cladding, 33- quartz bare fibre, 34- afterbody fibre claddings；40- optical spectroscopics element, 41- electronics
Shutter, the first slits of 42-, the second slits of 43-, 44- light source informations one, 45- light source informations two.
Embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, but the implementation not limited to this of the present invention.
Embodiment 1：The present invention provides a kind of LED array junction temperature quick online detection device, its structure is as shown in Figure 1.Bag
Include drive current source 7, temperature control box 2, light acquiring unit 3, multispectral information acquisition unit 4 and computer 6.The drive current source
7 provide different pulse widths, the driving current of different amplitudes needed for detection for LED array 1；The temperature control box 2 is LED times
Row 1 provide controllable environment temperature, and LED array light acquiring unit 3 obtains glitch-free between 6 LED illuminating sources in LED array
Light, is provided to multispectral information detecting unit 4, obtains the spectral information of 6 LED illuminating sources, will by transmission line 5
The spectral information of CCD is sent in computer 6 by interface；After computer carries out the analysis and processing of spectral information by software
Draw the spectral information of the corresponding junction temperature of detected LED array.
In the embodiment of the present invention, light acquiring unit 3 takes light acquiring unit X as shown in Figure 2, as a kind of technical solution,
Light acquiring unit 3 use transmission-type image forming job principle, by sequentially set diaphragm 11, collimating mirror 12, cemented doublet A 13,
Positive lens 14 and cemented doublet B 15 are formed, and the light diminution that 6 aligned LED are sent are condensed to suitable multispectral
The size that information detecting unit 4 detects, crosstalk is not produced between LED luminescent spectrums during reducing optically focused.
In the embodiment of the present invention, optical spectroscopic element 40 used is flattened field concave surface light in multispectral information detecting unit 4
Grid, as shown in Figure 5.The break-make that electronic shutter 41 controls light path is added in input path.When electronic shutter 41 is opened, slit
The multiple light courcess at the place light that for example first slit 42, the second slit 43 etc. are sent carries out standard by optical spectroscopic element 40
Directly, it is divided, after focusing, spectral information such as light source information 1, the light source information of the mutually multiple light courcess of not crosstalk is presented on spectrum face
2 45 etc., in the embodiment of the present invention, CCD used is total-frame transfer type matrix CCD.Total-frame transfer type matrix CCD is placed on light
The imaging spectral face of grid, you can opto-electronic conversion is carried out to the spectral information of multiple light courcess, closes electronic shutter 41, no spectral information into
When entering total-frame transfer type matrix CCD, the charge signal transfer on total-frame transfer type matrix CCD is exported, uploaded in computer 6.
Embodiment 2：The present invention provides a kind of LED array junction temperature quick online detection device, its structure is as shown in Figure 1.No
Be in the embodiment of the present invention, light acquiring unit 3 takes light acquiring unit Y as shown in Figure 3, by parabolic mirror 21,
Ellipsoidal mirror 22, ellipsoidal mirror M23 and ellipsoidal mirror N24 compositions.The light that LED array 1 is sent passes through by throwing
With parallel light emergence, mistake of each road light in reflection after the light source colimated light system that parabolic mirror 21 and ellipsoidal mirror 22 form
Cheng Zhong, does not produce crosstalk each other.Pass through the beam-expanding system being made of ellipsoidal mirror M23 and ellipsoidal mirror N24 again,
The spacing of multi beam directional light is narrowed down to the size that suitable multispectral information detecting unit 4 detects by beam-expanding system, reduces optically focused
During each road light of LED do not produce crosstalk each other.In the embodiment of the present invention, frame transfer type area array CCD is taken, to spectral information
It is acquired, since frame transfer type CCD carries electric charge storage region, in the technical program, it is not necessary to which electronic shutter 41 is controlled
The shut-off of light path processed.
Embodiment 3：The present invention provides a kind of LED array junction temperature quick online detection device, its structure is as shown in Figure 1.No
Same is in the present embodiment, and light acquiring unit 3 takes light acquiring unit Z as shown in Figure 4, uses one bifurcation fiber of the six directions.Six
There are 6 head fibre-optical splices in unification bifurcation fiber one end, and each head fibre-optical splice shown in the enlarged drawing of lower section, wraps on the left of Fig. 4
Fibre cladding containing head 32, head fibre cladding 32 is interior to include a quartzy bare fibre 33；The other end of one bifurcation fiber of the six directions
An only afterbody fibre-optical splice, afterbody fibre-optical splice shown in enlarged drawing, include 6 on the right side of Fig. 4 in afterbody fibre cladding 34
Vertically, compact arranged quartzy bare fibre 33.In the present embodiment, LED array 1 can be arranged with distributing, the optical signal that LED is sent
After cylindrical diaphragm 31, into 6 head fibre-optical splices of one bifurcation fiber of the six directions, in the one bifurcation fiber other end of the six directions
When (afterbody) is emitted, become the compact arranged optical signal of a row.In technical scheme, multispectral information detecting unit 4
Disposably it is imaged onto on CCD pixels after being divided into a compact arranged optical signal of row, each spectral information is in CCD image planes
Can good discrimination.It will be arranged in a row after LED institutes emission collection, spacing reduces between optical fiber, and fiber outlet is placed on grating
Optical slot at.
As shown in fig. 6, Fig. 6 for 6 arbitrary sources at slit after optical spectroscopic element 40 in full frame transfevent face battle array
The upper formed energy diagrams of CCD, gray scale is bigger at respective wavelength, and energy is higher at the wavelength.
In the present embodiment, progressively increased to by varying the environment temperature of temperature control box 2 with 10 DEG C for unit increment by 30 DEG C
70 DEG C, the peak wavelength of luminescent spectrum of 6 tunnel independence LED can be obtained with the increased curve of environment temperature, as shown in fig. 7, Fig. 7
Middle abscissa is environment temperature (DEG C), and ordinate is peak wavelength (nm).
Claims (1)
1. a kind of LED array junction temperature quick online detection device, including it is drive current source, temperature control box, light acquiring unit, multispectral
Information detecting unit and computer, the drive current source provide different pulse widths, the difference needed for detection for LED array
The driving current of amplitude；The temperature control box provides controllable environment temperature for LED array；It is characterized in that：The light obtains
Take unit to be designed with three kinds of forms, be respectively light acquiring unit X, light acquiring unit Y, light acquiring unit Z；Light acquiring unit obtains
Glitch-free light between plurality of LEDs light source in LED array, there is provided to multispectral information detecting unit；
The light acquiring unit X is by the diaphragm, collimating mirror, cemented doublet A, positive lens and the cemented doublet head that sequentially set
B is formed, and the light that more aligned LED arrays are sent is by diaphragm, collimating mirror, transmission-type cemented doublet A, just saturating
After mirror, transmission-type cemented doublet B, the light that LED array is sent is reduced and is condensed to suitable multispectral information detecting unit detection
Size, there is provided to multispectral information detecting unit, reduce and do not produce crosstalk between LED array luminescent spectrum during optically focused；
The light acquiring unit Y is by parabolic mirror, plane mirror, ellipsoidal mirror M, ellipsoidal mirror N groups
Into, the light that LED array is sent by by parabolic mirror and plane speculum group into light source colimated light system after with directional light
Outgoing, each road light do not produce crosstalk each other during reflection；Again by being reflected by ellipsoidal mirror M and ellipsoid
The spacing of multi beam directional light is narrowed down to suitable multispectral information detecting unit and detected by the beam-expanding system of mirror N compositions, beam-expanding system
Size, reduce optically focused during each road light of LED array do not produce crosstalk each other；
The light acquiring unit Z will be arranged in a row using the All-in-One bifurcation fiber for adding diaphragm after LED array institute emission collection
Row are supplied to multispectral information detecting unit；
Plurality of LEDs light source disposably collimated, is divided by the multispectral information detecting unit, focus on after, on spectrum face
The spectral information of non-interfering multiple light courcess is presented；
The multispectral information detecting unit includes optical spectroscopic element and CCD, and optical spectroscopic element used is flattened field
Concave grating, CCD used are the CCD of full frame transfevent, by the switch of mechanical shutter control light-path, when shutter is opened
CCD carries out optical signal photosensitive, CCD progress electric charge transfer when shutter closes, to obtain plurality of LEDs light source in LED array
Spectral information；The photosurface of CCD is placed on the imaging spectral face of grating by multispectral information detecting unit, obtains plurality of LEDs light
The spectral information in source；
The multispectral information detecting unit carries out junction temperature detection using spectroscopic methodology, obtains the spectral information of each LED light source, leads to
Transmission line is crossed to be sent to the spectral information of CCD in computer by interface；The computer analyzed by software and
The spectral information of the corresponding junction temperature of detected LED array is drawn after processing.
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| CN201410802751.5A CN104459510B (en) | 2014-12-18 | 2014-12-18 | A kind of LED array junction temperature quick online detection device |
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| CN201410802751.5A CN104459510B (en) | 2014-12-18 | 2014-12-18 | A kind of LED array junction temperature quick online detection device |
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Families Citing this family (12)
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| CN107024648A (en) * | 2017-04-17 | 2017-08-08 | 东南大学 | LED junction temperature measurement device and method based on impulse method |
| CN107015134B (en) * | 2017-05-23 | 2019-08-09 | 山东大学 | A kind of test macro and its application of LED light Electrothermal Properties |
| CN107560737A (en) * | 2017-09-28 | 2018-01-09 | 清华大学 | A kind of vehicle axles multiple point temperature measurement device and method based on infrared multispectral |
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| CN108169847A (en) * | 2018-03-13 | 2018-06-15 | 杭州艾芯智能科技有限公司 | A kind of large field of view scan imaging optical system |
| CN108981943B (en) * | 2018-06-13 | 2021-08-13 | 苏州晶品新材料股份有限公司 | Nondestructive real-time measurement method for junction temperature of LED light source |
| CN108414915B (en) * | 2018-06-13 | 2020-12-08 | 苏州晶品新材料股份有限公司 | LED light source nondestructive real-time chip distinguishable measuring device |
| CN108680849B (en) * | 2018-07-06 | 2024-03-22 | 中国电子技术标准化研究院 | Method and device for measuring junction temperature of electronic device |
| KR20200015049A (en) * | 2018-08-02 | 2020-02-12 | (주)제이티 | Slit light source and vision inspection apparatus having the same |
| CN109596963B (en) * | 2018-12-18 | 2021-09-21 | 中国电子科技集团公司第十三研究所 | Pulse modulation device for detecting junction temperature |
| CN113390612A (en) * | 2021-06-04 | 2021-09-14 | 盐城东紫光电科技有限公司 | MiniLED detection equipment with point-to-point multi-optical-path optical component |
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