CN103713253B - Illuminance, colourity, the detection method of junction temperature decay characteristic in LED - Google Patents
Illuminance, colourity, the detection method of junction temperature decay characteristic in LED Download PDFInfo
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- CN103713253B CN103713253B CN201410006444.6A CN201410006444A CN103713253B CN 103713253 B CN103713253 B CN 103713253B CN 201410006444 A CN201410006444 A CN 201410006444A CN 103713253 B CN103713253 B CN 103713253B
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Abstract
The present invention discloses illuminance in a kind of LED, colourity, the on-line detecting system of junction temperature decay characteristic and method, the present invention, junction temperature monitoring modular described in employing provides the aging current of reliability test for tested LED, by being fitted the relation of LED forward voltage and junction temperature, re-test LED is in the forward voltage reverse junction temperature corresponding to different ageing time points；By described optical cable transmission system by outside the light output conduction of tested LED to reliability test environment, temperature chamber carries out optical parametric test；Between periodic signal high period, gathered illuminance and the colourity of tested LED by described pulse modulation system, between described impulse modulation periodic signal low period, gather LED junction temperature.The method difference and traditional LED reliability off-line test method, have measuring accuracy high, the advantages such as test uncertainty is little, it is possible to the effective human and material resources saving reliability testing, and the efficient rapid evaluation for LED reliability provides a set of scientific scheme.
Description
Technical field
The present invention relates to optoelectronic information Test and control field, be specifically related to illuminance in a kind of LED, colourity, the on-line measuring device of junction temperature decay and method.
Background technology
For LED reliability testing, sample is usually placed in reliability test environment aging by current detection means, taking out sample after fixed time intervals, in corresponding test equipment, test sample light under nominal operating conditions exports and the change of thermal resistance/junction temperature respectively.Whole ageing process is the longest, and reliability testing is loaded down with trivial details, need to put into a large amount of manpower and materials cost, and the accuracy of the test data self obtained by off-line test is poor.The LM80 standard that North America Illuminating Engineering Society proposes is pointed out, assess the ageing time that the reliability of a kind of LED product at least needs more than 8000 hours, and LED industry current model change cycle is typically within 1 year, this pace of product renewal faster makes the current more reliability acceleration service life test method using recommendation, is shortened by test period and raising data precision more effectively assesses the LED real work life-span.
Summary of the invention
For the problems referred to above, the present invention provides the on-line measuring device and method that illuminance in a kind of LED, colourity, junction temperature decay, and can effectively promote the data accuracy in existing LED reliability testing and operation convenience.
For reaching above-mentioned purpose, illuminance, colourity, the on-line detecting system of junction temperature decay in LED of the present invention, reliability test case, sensor group and the computer being electrically connected including light, thermal parameter online acquisition instrument and described light, thermal parameter online acquisition instrument, described reliability test case connects described sensor group respectively, wherein
Described reliability test case, is used for placing tested LED, gathers the junction temperature parameter signal of described tested LED, and by the output of described junction temperature parameter signal to described light, thermal parameter online acquisition instrument；
Described sensor group, for gathering illuminance parameter signal and the colorimetric parameter signal of described tested LED, and exports described illuminance parameter signal and described colorimetric parameter signal to described light, thermal parameter online acquisition instrument；
Described light, thermal parameter online acquisition instrument, for providing the test electric current needed for tested LED, be converted to the corresponding signal of telecommunication by described junction temperature parameter signal, illuminance parameter signal, colorimetric parameter signal, and export the described signal of telecommunication to computer；
Described computer, for based on LED tested described in described electrical signal detection.
Further, described sensor group includes that illuminance sensor, chromaticity transducer, described reliability test case are electrically connected described illuminance sensor and described chromaticity transducer by Y type cable.
Further, described reliability test case includes the high temperature shade that casing is arranged in described casing, is provided with LED clip holder in described high temperature shade, and described tested LED electrically connects described light, thermal parameter online acquisition instrument by described LED clip holder.
Further, described sensor group includes temperature chamber, it is arranged on the illuminance sensor in described temperature chamber and chromaticity transducer, described illuminance sensor and chromaticity transducer are separately positioned on reception clamper, described illuminance sensor and chromaticity transducer electrically connect described light, thermal parameter online acquisition instrument by described reception clamper respectively, and described illuminance sensor and chromaticity transducer are separately positioned in shade.
Further, described light, thermal parameter online acquisition instrument provide the online aging current in 350mA～1050mA for described tested LED.
Further, described light, thermal parameter online acquisition instrument provide pulse width modulating signal for described tested LED, between pulse width modulation period signal high period, gather described LED junction temperature, between pulse width modulating signal low period, gather LED light illumination, colour temperature respectively.
For reaching above-mentioned purpose, the detection method of illuminance in LED of the present invention, colourity, junction temperature decay, including above-mentioned device, wherein said method includes concrete steps specific as follows:
Step S1, receives gripper by the receiving terminal of tested LED and optical fiber cable by described LED light source, keeps LED module to go out light center the most contour with the reception end face of optical cable；
Step S2, two outfans of y-type optical fiber optical cable carry out coaxial clamping with illuminance sensor, chromaticity transducer by described reception clamper respectively, arrange receiving range according to the numerical aperture size of described Y type optical cable；
Step S3, distance between tested LED and optical fiber cable in optimization step S1, rated operational current is provided for tested LED by described light, thermal parameter online acquisition instrument, Lambertian distribution is obeyed in the light distribution making LED light source be incident upon on the receiving plane of optical fiber cable, makes the illuminance on the output end face of optical fiber cable reach maximum simultaneously；
Step S4, using described LED reliability test case temperature as tested LED junction temperature, the test electric current less than 5mA is provided for tested LED by described light, thermal parameter online acquisition instrument, respectively proof box different temperatures and corresponding forward voltage reference value are carried out least square fitting, obtain forward voltage and the relational expression of LED junction temperature；
Step S5, arranges degradation environment to LED reliability test case, provides the aging current in the range of 350mA～1050mA with described light, thermal parameter online acquisition instrument for tested LED；
Step S6, after tested LED reaches thermal balance, uses pulse-width modulation method to control respectively to test electric current and the action time of aging current, gathers illuminance and the colourity of LED in the aging current action period, obtain the junction temperature of LED in the test function of current cycle.
Illuminance, colourity, the on-line measuring device of junction temperature decay and method in LED of the present invention, on the premise of following LM80 standard, by the illuminance of LED sample, colourity and three kinds of parameters of junction temperature are carried out on-line checking, the method does not change the aging working condition of test sample in the reliability testing cycle, obtain the light of sample, thermal parameter situation of change by continuous acquisition, decrease the test error under original test case.It addition, by the real-time data acquisition of online testing device, it is possible to effectively save the human and material resources equal loss during reliability testing.
Accompanying drawing explanation
Fig. 1 is the structural representation of on-line measuring device of the present invention；
A kind of PWM that Fig. 2 provides for the present invention controls sequential working schematic diagram；
Fig. 3 is the corresponding relation schematic diagram of Relative light intensity degree and total light flux；
Fig. 4 is the graph of a relation between tested LED forward drop and junction temperature；
Illuminance, colourity and the online test method flow chart of junction temperature decay characteristic in a kind of great power LED reliability that Fig. 5 provides for the present invention.
Detailed description of the invention
Below in conjunction with Figure of description, the present invention will be further described.
Illuminance, colourity, the on-line detecting system of junction temperature decay in LED of the present invention, reliability test case, sensor group and the computer being electrically connected including light, thermal parameter online acquisition instrument and described light, thermal parameter online acquisition instrument, described reliability test case connects described sensor group respectively, wherein
Described reliability test case, is used for placing tested LED, gathers the junction temperature parameter signal of described tested LED, and by the output of described junction temperature parameter signal to described light, thermal parameter online acquisition instrument；
Described sensor group, for gathering illuminance parameter signal and the colorimetric parameter signal of described tested LED, and exports described illuminance parameter signal and described colorimetric parameter signal to described light, thermal parameter online acquisition instrument；
Described light, thermal parameter online acquisition instrument, for providing the test electric current needed for tested LED, described light, thermal parameter online acquisition instrument provide the online aging current in 350mA～1050mA for described tested LED, described junction temperature parameter signal, illuminance parameter signal, colorimetric parameter signal are converted to the corresponding signal of telecommunication, and export the described signal of telecommunication to computer；
Described computer, for based on LED tested described in described electrical signal detection.
Illuminance, colourity, the on-line measuring device of junction temperature decay in LED of the present invention, tested LED is electrically connected with described light, thermal parameter online acquisition instrument.Tested LED is placed in reliability test case, and docks with one end of y-type optical fiber optical cable.Described sensor group includes temperature chamber, it is arranged on the illuminance sensor in described temperature chamber and chromaticity transducer, described illuminance sensor and chromaticity transducer are separately positioned on reception clamper, described illuminance sensor and chromaticity transducer electrically connect described light, thermal parameter online acquisition instrument by described reception clamper respectively, and described illuminance sensor and chromaticity transducer are separately positioned in shade.The other end of described y-type optical fiber optical cable docks with illuminance, chromaticity transducer respectively, and is fixed in temperature chamber.Described light, one end of thermal parameter online acquisition instrument are connected with described illuminance, chromaticity transducer, and the other end is connected with computer.Tested LED is provided operating current and test electric current by described light, thermal parameter online acquisition instrument, during operating current, the light of tested LED exports by described y-type optical fiber optical cable transmission to temperature chamber, optical parameter signal is gathered by described illuminance, chromaticity transducer, be converted to the signal of telecommunication by described light, thermal parameter online acquisition instrument, export in computer.During test electric current, the junction temperature of tested LED carries out forward voltage extraction by described light, thermal parameter online acquisition instrument, voltage-temperature calibration function be converted to junction temperature signal, exports in computer.
Wherein, in described reliability test case, it is provided with high temperature shade, in described high temperature shade, is provided with the LED light source clamper connecting tested LED with described y-type optical fiber optical cable input.It is provided with room temperature shade in described temperature chamber, in described room temperature shade, is provided with outfan and illuminance, the reception clamper of chromaticity transducer of y-type optical fiber optical cable described in connection.nullDescribed illuminance sensor and chromaticity transducer are separately positioned in shade，Described light、Thermal parameter online acquisition instrument electrically connects with described illuminance sensor and chromaticity transducer respectively，Described light、Thermal parameter online acquisition instrument is electrically connected by described LED light source clamper and described LED，Described light、The test electric current of the LED to be tested described in the offer of thermal parameter online acquisition instrument，Described LED to be measured is connected with optical fiber cable receiving terminal by described light source clamper，Described illuminance sensor probe and colourity sensor probe are attached by two outfans of described reception clamper with y-type optical fiber optical cable respectively，Described light、Thermal parameter online acquisition instrument electrical connection computer，Tested LED and optical fiber cable receiving terminal are carried out the most contour by described light source clamper，Described reception clamper is respectively by illuminance sensor、Chromaticity transducer carries out coaxial with the two of y-type optical fiber optical cable outfans.
As shown in Figure 1, illuminance, colourity and the on-line measuring device of junction temperature decay characteristic in a kind of great power LED reliability of the present invention, its composition includes that reliability test case 1, high temperature shade 2, LED light source receive clamper 3, y-type optical fiber optical cable 4, temperature chamber 5, shade 6, receive clamper 7, illuminance sensor 8 and chromaticity transducer 9, light, thermal parameter online acquisition instrument 10 and PC computer 11.Tested LED is connected by described LED clip holder with described y-type optical fiber optical cable receiving terminal, and described illuminance sensor probe, colourity sensor probe are attached by the described clamper that receives respectively with two outfans of described y-type optical fiber optical cable.Described light, thermal parameter online acquisition instrument connect two sensor probes respectively, are simultaneously connected with tested LED, are finally connected with described computer.
Described light, thermal parameter online acquisition instrument provide operating current for tested LED, the characteristics of luminescence according to tested LED, through described y-type optical fiber optical cable collecting part light output, exported respectively to described illuminance transducer and chromaticity transducer by two outfans of y-type optical fiber optical cable, the sampling period of two optical parametrics is set according to testing requirement.
Described light, thermal parameter online acquisition instrument provide test electric current for tested LED, and the forward voltage drop of LED junction declines along with the rising of junction temperature.By, under described test current work state, demarcating the relation between tested LED forward voltage and junction temperature, by the LED forward drop under test different temperatures, obtain the working junction temperature of LED.
As shown in Figure 2, for a kind of pulse width modulating signal of the present invention, produced by described light, thermal parameter online acquisition instrument, wherein crystal oscillator pulse (I) pulse-period signal (II) PWM controls sequential (III), crystal oscillator pulse first passes around Fractional-N frequency and constitutes pulse-period signal, time delay sampling is carried out between pulse-period signal high period, collection LED junction temperature, at periodic signal N/4, start to gather the illuminance of tested LED, at periodic signal 3N/4, gather the colourity of tested LED.Described light, thermal parameter online acquisition instrument provide pulse width modulating signal for described tested LED, between pulse width modulation period signal high period, gather described LED junction temperature, between pulse width modulating signal low period, gather LED light illumination, colour temperature respectively.
Corresponding relation schematic diagram between tested LED Relative light intensity degree and total light flux that Fig. 3 provides for the present invention, in the present embodiment, the Relative light intensity degree of tested LED is the linear function of LED total light flux, by demarcating total light flux and the functional relationship of part illuminance value under different electric current, the attenuation change of the Relative light intensity degree direct reaction total light flux of tested LED can be used.
Graph of a relation between tested LED forward drop and junction temperature that Fig. 4 provides for the present invention, in the present embodiment, it is contemplated that actual degradation environment, in high temperature range, forward voltage drop-junction temperature function uses the nonlinear function of fitting of a polynomial.
In LED reliability of the present invention, the online test method of illuminance, colourity and junction temperature decay characteristic is as it is shown in figure 5, specifically include following steps:
Step S1, receives gripper by the receiving terminal of tested LED and optical fiber cable by described LED light source, keeps LED module to go out light center the most contour with the reception end face of optical cable；
Step S2, two outfans of y-type optical fiber optical cable carry out coaxial clamping with illuminance sensor, chromaticity transducer by described reception clamper respectively, arrange receiving range according to the numerical aperture size of described Y type optical cable
Step S3, distance between tested LED and optical fiber cable in optimization step S1, rated operational current is provided for tested LED by described light, thermal parameter online acquisition instrument, Lambertian distribution is obeyed in the light distribution making LED light source be incident upon on the receiving plane of optical fiber cable, makes the illuminance on the output end face of optical fiber cable reach maximum simultaneously；
Step S4, using described LED reliability test case temperature as tested LED junction temperature, the test electric current less than 5mA is provided for tested LED by described light, thermal parameter online acquisition instrument, respectively proof box different temperatures and corresponding forward voltage reference value are carried out least square fitting, obtain forward voltage and the relational expression of LED junction temperature.
Step S5, arranges degradation environment to LED reliability test case, provides the aging current in the range of 350mA～1050mA with described light, thermal parameter online acquisition instrument for tested LED；
Step S6, after tested LED reaches thermal balance, uses pulse-width modulation method to control respectively to test electric current and the action time of aging current, gathers illuminance and the colourity of LED in the aging current action period, obtain the junction temperature of LED in the test function of current cycle.
It is last it should be understood that above example is merely to illustrate technical scheme, it is not intended to limitation of the present invention, although the present invention being described in detail with reference to above-described embodiment, it will be understood by those skilled in the art that: still the detailed description of the invention of the present invention can be modified or equivalent, and without departing from any amendment of spirit and scope of the invention or equivalent, it all should be contained in scope of the presently claimed invention.
Claims (6)
1. illuminance, colourity, the detection method of junction temperature decay in a LED, it is characterised in that: include
Illuminance, colourity, the on-line detecting system of junction temperature decay in LED, described system includes:
What light, thermal parameter online acquisition instrument and described light, thermal parameter online acquisition instrument were electrically connected can
By property proof box, sensor group and computer, described reliability test case connects described sensor respectively
Group, wherein
Described reliability test case, is used for placing tested LED, gathers the junction temperature parameter of described tested LED
Signal, and by the output of described junction temperature parameter signal to described light, thermal parameter online acquisition instrument；
Described sensor group, for gathering illuminance parameter signal and the colorimetric parameter letter of described tested LED
Number, and described illuminance parameter signal and the output of described colorimetric parameter signal are existed to described light, thermal parameter
Line Acquisition Instrument；
Described light, thermal parameter online acquisition instrument, for providing the test electric current needed for tested LED, by institute
The junction temperature parameter signal stated, illuminance parameter signal, colorimetric parameter signal are converted to the corresponding signal of telecommunication,
And the described signal of telecommunication is exported to computer；
Described computer, for based on LED tested described in described electrical signal detection；
Wherein said method comprises the following specific steps that:
Step S1, receives gripper by the receiving terminal of tested LED and optical fiber cable by LED light source,
LED module is kept to go out light center the most contour with the reception end face of optical cable；
Step S2, two outfans of y-type optical fiber optical cable lead to illuminance sensor, chromaticity transducer respectively
Cross reception clamper and carry out coaxial clamping, receiving range is set according to the numerical aperture size of Y type optical cable；
Step S3, distance between tested LED and optical fiber cable in optimization step S1, by light, physochlaina infudibularis
Number online acquisition instrument provides rated operational current for tested LED, makes LED light source be incident upon connecing of optical fiber cable
Lambertian distribution is obeyed in light distribution on receipts face, makes the illuminance on the output end face of optical fiber cable simultaneously
Reach maximum；
Step S4, using LED reliability test case temperature as tested LED junction temperature, by light, thermal parameter
Online acquisition instrument provides less than the test electric current of 5mA for tested LED, respectively to proof box different temperatures and
Corresponding forward voltage reference value carries out least square fitting, obtains forward voltage and the relational expression of LED junction temperature；
Step S5, arranges degradation environment to LED reliability test case, uses up, thermal parameter online acquisition
Instrument provides the aging current in the range of 350mA～1050mA for tested LED；
Step S6, after tested LED reaches thermal balance, uses pulse-width modulation method to control test respectively
Electric current and the action time of aging current, gather illuminance and the colourity of LED in the aging current action period,
The junction temperature of LED is obtained in the test function of current cycle.
2. illuminance, colourity, the detection method of junction temperature decay in a LED, it is characterised in that: include
Illuminance, colourity, the on-line detecting system of junction temperature decay in LED, described system includes:
What light, thermal parameter online acquisition instrument and described light, thermal parameter online acquisition instrument were electrically connected can
By property proof box, sensor group and computer, described reliability test case connects described sensor respectively
Group, wherein
Described reliability test case, is used for placing tested LED, gathers the junction temperature parameter of described tested LED
Signal, and by the output of described junction temperature parameter signal to described light, thermal parameter online acquisition instrument；
Described sensor group, for gathering illuminance parameter signal and the colorimetric parameter letter of described tested LED
Number, and described illuminance parameter signal and the output of described colorimetric parameter signal are existed to described light, thermal parameter
Line Acquisition Instrument；
Described light, thermal parameter online acquisition instrument, for providing the test electric current needed for tested LED, by institute
The junction temperature parameter signal stated, illuminance parameter signal, colorimetric parameter signal are converted to the corresponding signal of telecommunication,
And the described signal of telecommunication is exported to computer；
Described computer, for based on LED tested described in described electrical signal detection；
Described sensor group includes that illuminance sensor, chromaticity transducer, described reliability test case pass through Y
Type optical cable is electrically connected described illuminance sensor and described chromaticity transducer；
Wherein said method comprises the following specific steps that:
Step S1, receives gripper by the receiving terminal of tested LED and optical fiber cable by LED light source,
LED module is kept to go out light center the most contour with the reception end face of optical cable；
Step S2, two outfans of y-type optical fiber optical cable lead to illuminance sensor, chromaticity transducer respectively
Cross reception clamper and carry out coaxial clamping, receiving range is set according to the numerical aperture size of Y type optical cable；
Step S3, distance between tested LED and optical fiber cable in optimization step S1, by light, physochlaina infudibularis
Number online acquisition instrument provides rated operational current for tested LED, makes LED light source be incident upon connecing of optical fiber cable
Lambertian distribution is obeyed in light distribution on receipts face, makes the illuminance on the output end face of optical fiber cable simultaneously
Reach maximum；
Step S4, using LED reliability test case temperature as tested LED junction temperature, by light, thermal parameter
Online acquisition instrument provides less than the test electric current of 5mA for tested LED, respectively to proof box different temperatures and
Corresponding forward voltage reference value carries out least square fitting, obtains forward voltage and the relational expression of LED junction temperature；
Step S5, arranges degradation environment to LED reliability test case, uses up, thermal parameter online acquisition
Instrument provides the aging current in the range of 350mA～1050mA for tested LED；
Step S6, after tested LED reaches thermal balance, uses pulse-width modulation method to control test respectively
Electric current and the action time of aging current, gather illuminance and the colourity of LED in the aging current action period,
The junction temperature of LED is obtained in the test function of current cycle.
3. illuminance, colourity, the detection method of junction temperature decay in a LED, it is characterised in that: include
Illuminance, colourity, the on-line detecting system of junction temperature decay in LED, described system includes:
What light, thermal parameter online acquisition instrument and described light, thermal parameter online acquisition instrument were electrically connected can
By property proof box, sensor group and computer, described reliability test case connects described sensor respectively
Group, wherein
Described reliability test case, is used for placing tested LED, gathers the junction temperature parameter of described tested LED
Signal, and by the output of described junction temperature parameter signal to described light, thermal parameter online acquisition instrument；
Described sensor group, for gathering illuminance parameter signal and the colorimetric parameter letter of described tested LED
Number, and described illuminance parameter signal and the output of described colorimetric parameter signal are existed to described light, thermal parameter
Line Acquisition Instrument；
Described light, thermal parameter online acquisition instrument, for providing the test electric current needed for tested LED, by institute
The junction temperature parameter signal stated, illuminance parameter signal, colorimetric parameter signal are converted to the corresponding signal of telecommunication,
And the described signal of telecommunication is exported to computer；
Described computer, for based on LED tested described in described electrical signal detection；
Described sensor group includes that illuminance sensor, chromaticity transducer, described reliability test case pass through Y
Type optical cable is electrically connected described illuminance sensor and described chromaticity transducer；
Described reliability test case includes the high temperature shade being arranged in casing, in described high temperature shade
Being provided with LED clip holder, described tested LED electrically connects described light, physochlaina infudibularis by described LED clip holder
Number online acquisition instrument；
Wherein said method comprises the following specific steps that:
Step S1, receives gripper by the receiving terminal of tested LED and optical fiber cable by LED light source,
LED module is kept to go out light center the most contour with the reception end face of optical cable；
Step S2, two outfans of y-type optical fiber optical cable lead to illuminance sensor, chromaticity transducer respectively
Cross reception clamper and carry out coaxial clamping, receiving range is set according to the numerical aperture size of Y type optical cable；
Step S3, distance between tested LED and optical fiber cable in optimization step S1, by light, physochlaina infudibularis
Number online acquisition instrument provides rated operational current for tested LED, makes LED light source be incident upon connecing of optical fiber cable
Lambertian distribution is obeyed in light distribution on receipts face, makes the illuminance on the output end face of optical fiber cable simultaneously
Reach maximum；
Step S4, using LED reliability test case temperature as tested LED junction temperature, by light, thermal parameter
Online acquisition instrument provides less than the test electric current of 5mA for tested LED, respectively to proof box different temperatures and
Corresponding forward voltage reference value carries out least square fitting, obtains forward voltage and the relational expression of LED junction temperature；
Step S5, arranges degradation environment to LED reliability test case, uses up, thermal parameter online acquisition
Instrument provides the aging current in the range of 350mA～1050mA for tested LED；
Step S6, after tested LED reaches thermal balance, uses pulse-width modulation method to control test respectively
Electric current and the action time of aging current, gather illuminance and the colourity of LED in the aging current action period,
The junction temperature of LED is obtained in the test function of current cycle.
4. illuminance, colourity, the detection method of junction temperature decay in a LED, it is characterised in that: include
Illuminance, colourity, the on-line detecting system of junction temperature decay in LED, described system includes:
What light, thermal parameter online acquisition instrument and described light, thermal parameter online acquisition instrument were electrically connected can
By property proof box, sensor group and computer, described reliability test case connects described sensor respectively
Group, wherein
Described reliability test case, is used for placing tested LED, gathers the junction temperature parameter of described tested LED
Signal, and by the output of described junction temperature parameter signal to described light, thermal parameter online acquisition instrument；
Described sensor group, for gathering illuminance parameter signal and the colorimetric parameter letter of described tested LED
Number, and described illuminance parameter signal and the output of described colorimetric parameter signal are existed to described light, thermal parameter
Line Acquisition Instrument；
Described light, thermal parameter online acquisition instrument, for providing the test electric current needed for tested LED, by institute
The junction temperature parameter signal stated, illuminance parameter signal, colorimetric parameter signal are converted to the corresponding signal of telecommunication,
And the described signal of telecommunication is exported to computer；
Described computer, for based on LED tested described in described electrical signal detection；
Described sensor group includes that illuminance sensor, chromaticity transducer, described reliability test case pass through Y
Type optical cable is electrically connected described illuminance sensor and described chromaticity transducer；
Described reliability test case includes the high temperature shade being arranged in casing, in described high temperature shade
Being provided with LED clip holder, described tested LED electrically connects described light, physochlaina infudibularis by described LED clip holder
Number online acquisition instrument；
Described sensor group includes temperature chamber, is arranged on the illuminance sensor in described temperature chamber and colourity
Sensor, described illuminance sensor and chromaticity transducer are separately positioned on reception clamper, described
Illuminance sensor and chromaticity transducer respectively by described reception clamper electrically connect described light, physochlaina infudibularis
Number online acquisition instrument, described illuminance sensor and chromaticity transducer are separately positioned in shade；
Wherein said method comprises the following specific steps that:
Step S1, receives gripper by the receiving terminal of tested LED and optical fiber cable by LED light source,
LED module is kept to go out light center the most contour with the reception end face of optical cable；
Step S2, two outfans of y-type optical fiber optical cable lead to illuminance sensor, chromaticity transducer respectively
Cross reception clamper and carry out coaxial clamping, receiving range is set according to the numerical aperture size of Y type optical cable；
Step S3, distance between tested LED and optical fiber cable in optimization step S1, by light, physochlaina infudibularis
Number online acquisition instrument provides rated operational current for tested LED, makes LED light source be incident upon connecing of optical fiber cable
Lambertian distribution is obeyed in light distribution on receipts face, makes the illuminance on the output end face of optical fiber cable simultaneously
Reach maximum；
Step S4, using LED reliability test case temperature as tested LED junction temperature, by light, thermal parameter
Online acquisition instrument provides less than the test electric current of 5mA for tested LED, respectively to proof box different temperatures and
Corresponding forward voltage reference value carries out least square fitting, obtains forward voltage and the relational expression of LED junction temperature；
Step S5, arranges degradation environment to LED reliability test case, uses up, thermal parameter online acquisition
Instrument provides the aging current in the range of 350mA～1050mA for tested LED；
Step S6, after tested LED reaches thermal balance, uses pulse-width modulation method to control test respectively
Electric current and the action time of aging current, gather illuminance and the colourity of LED in the aging current action period,
The junction temperature of LED is obtained in the test function of current cycle.
5. illuminance, colourity, the detection method of junction temperature decay in a LED, it is characterised in that: include
Illuminance, colourity, the on-line detecting system of junction temperature decay in LED, described system includes:
What light, thermal parameter online acquisition instrument and described light, thermal parameter online acquisition instrument were electrically connected can
By property proof box, sensor group and computer, described reliability test case connects described sensor respectively
Group, wherein
Described reliability test case, is used for placing tested LED, gathers the junction temperature parameter of described tested LED
Signal, and by the output of described junction temperature parameter signal to described light, thermal parameter online acquisition instrument；
Described sensor group, for gathering illuminance parameter signal and the colorimetric parameter letter of described tested LED
Number, and described illuminance parameter signal and the output of described colorimetric parameter signal are existed to described light, thermal parameter
Line Acquisition Instrument；
Described light, thermal parameter online acquisition instrument, for providing the test electric current needed for tested LED, by institute
The junction temperature parameter signal stated, illuminance parameter signal, colorimetric parameter signal are converted to the corresponding signal of telecommunication,
And the described signal of telecommunication is exported to computer；
Described computer, for based on LED tested described in described electrical signal detection；
Described sensor group includes that illuminance sensor, chromaticity transducer, described reliability test case pass through Y
Type optical cable is electrically connected described illuminance sensor and described chromaticity transducer；
Described reliability test case includes the high temperature shade being arranged in casing, in described high temperature shade
Being provided with LED clip holder, described tested LED electrically connects described light, physochlaina infudibularis by described LED clip holder
Number online acquisition instrument；
Described sensor group includes temperature chamber, is arranged on the illuminance sensor in described temperature chamber and colourity
Sensor, described illuminance sensor and chromaticity transducer are separately positioned on reception clamper, described
Illuminance sensor and chromaticity transducer respectively by described reception clamper electrically connect described light, physochlaina infudibularis
Number online acquisition instrument, described illuminance sensor and chromaticity transducer are separately positioned in shade；
In described light, thermal parameter online acquisition instrument provide 350mA～1050mA for described tested LED
Online aging current；
Wherein said method comprises the following specific steps that:
Step S1, receives gripper by the receiving terminal of tested LED and optical fiber cable by LED light source,
LED module is kept to go out light center the most contour with the reception end face of optical cable；
Step S2, two outfans of y-type optical fiber optical cable lead to illuminance sensor, chromaticity transducer respectively
Cross reception clamper and carry out coaxial clamping, receiving range is set according to the numerical aperture size of Y type optical cable；
Step S3, distance between tested LED and optical fiber cable in optimization step S1, by light, physochlaina infudibularis
Number online acquisition instrument provides rated operational current for tested LED, makes LED light source be incident upon connecing of optical fiber cable
Lambertian distribution is obeyed in light distribution on receipts face, makes the illuminance on the output end face of optical fiber cable simultaneously
Reach maximum；
Step S4, using LED reliability test case temperature as tested LED junction temperature, by light, thermal parameter
Online acquisition instrument provides less than the test electric current of 5mA for tested LED, respectively to proof box different temperatures and
Corresponding forward voltage reference value carries out least square fitting, obtains forward voltage and the relational expression of LED junction temperature；
Step S5, arranges degradation environment to LED reliability test case, uses up, thermal parameter online acquisition
Instrument provides the aging current in the range of 350mA～1050mA for tested LED；
Step S6, after tested LED reaches thermal balance, uses pulse-width modulation method to control respectively to test electric current
With the action time of aging current, gather the illuminance of LED and colourity in the aging current action period, surveying
The examination function of current cycle obtains the junction temperature of LED.
6. illuminance, colourity, the detection method of junction temperature decay in a LED, it is characterised in that: include
Illuminance, colourity, the on-line detecting system of junction temperature decay in LED, described system includes:
What light, thermal parameter online acquisition instrument and described light, thermal parameter online acquisition instrument were electrically connected can
By property proof box, sensor group and computer, described reliability test case connects described sensor respectively
Group, wherein
Described reliability test case, is used for placing tested LED, gathers the junction temperature parameter of described tested LED
Signal, and by the output of described junction temperature parameter signal to described light, thermal parameter online acquisition instrument；
Described sensor group, for gathering illuminance parameter signal and the colorimetric parameter letter of described tested LED
Number, and described illuminance parameter signal and the output of described colorimetric parameter signal are existed to described light, thermal parameter
Line Acquisition Instrument；
Described light, thermal parameter online acquisition instrument, for providing the test electric current needed for tested LED, by institute
The junction temperature parameter signal stated, illuminance parameter signal, colorimetric parameter signal are converted to the corresponding signal of telecommunication,
And the described signal of telecommunication is exported to computer；
Described computer, for based on LED tested described in described electrical signal detection；
Described sensor group includes that illuminance sensor, chromaticity transducer, described reliability test case pass through Y
Type optical cable is electrically connected described illuminance sensor and described chromaticity transducer；
Described reliability test case includes the high temperature shade being arranged in casing, in described high temperature shade
Being provided with LED clip holder, described tested LED electrically connects described light, physochlaina infudibularis by described LED clip holder
Number online acquisition instrument；
Described sensor group includes temperature chamber, is arranged on the illuminance sensor in described temperature chamber and colourity
Sensor, described illuminance sensor and chromaticity transducer are separately positioned on reception clamper, described
Illuminance sensor and chromaticity transducer respectively by described reception clamper electrically connect described light, physochlaina infudibularis
Number online acquisition instrument, described illuminance sensor and chromaticity transducer are separately positioned in shade；
In described light, thermal parameter online acquisition instrument provide 350mA～1050mA for described tested LED
Online aging current；
Described light, thermal parameter online acquisition instrument provide pulse width modulating signal for described tested LED,
Described LED junction temperature is gathered, at pulse width modulating signal between pulse width modulation period signal high period
LED light illumination, colour temperature is gathered respectively between low period；
Wherein said method comprises the following specific steps that:
Step S1, receives gripper by the receiving terminal of tested LED and optical fiber cable by LED light source,
LED module is kept to go out light center the most contour with the reception end face of optical cable；
Step S2, two outfans of y-type optical fiber optical cable lead to illuminance sensor, chromaticity transducer respectively
Cross reception clamper and carry out coaxial clamping, receiving range is set according to the numerical aperture size of Y type optical cable；
Step S3, distance between tested LED and optical fiber cable in optimization step S1, by light, physochlaina infudibularis
Number online acquisition instrument provides rated operational current for tested LED, makes LED light source be incident upon connecing of optical fiber cable
Lambertian distribution is obeyed in light distribution on receipts face, makes the illuminance on the output end face of optical fiber cable simultaneously
Reach maximum；
Step S4, using LED reliability test case temperature as tested LED junction temperature, by light, thermal parameter
Online acquisition instrument provides less than the test electric current of 5mA for tested LED, respectively to proof box different temperatures and
Corresponding forward voltage reference value carries out least square fitting, obtains forward voltage and the relational expression of LED junction temperature；
Step S5, arranges degradation environment to LED reliability test case, uses up, thermal parameter online acquisition
Instrument provides the aging current in the range of 350mA～1050mA for tested LED；
Step S6, after tested LED reaches thermal balance, uses pulse-width modulation method to control respectively to test electric current
With the action time of aging current, gather the illuminance of LED and colourity in the aging current action period, surveying
The examination function of current cycle obtains the junction temperature of LED.
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| CN104765006A (en) * | 2015-04-10 | 2015-07-08 | 天津工业大学 | Method for LED aging accelerating |
| CN104867843A (en) * | 2015-04-30 | 2015-08-26 | 苏州承乐电子科技有限公司 | Detection device for LED luminous chip |
| CN105353289A (en) * | 2015-10-22 | 2016-02-24 | 江苏新广联半导体有限公司 | LED chip junction temperature testing method |
| CN105911486B (en) * | 2016-04-19 | 2019-11-19 | 深圳Tcl数字技术有限公司 | Lamp bar light decay detection method, device and system |
| CN107271927A (en) * | 2017-05-18 | 2017-10-20 | 中国科学院长春光学精密机械与物理研究所 | On-line testing method in LED temperature accelerated ageing conditions |
| 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 |
| CN110426552A (en) * | 2019-07-29 | 2019-11-08 | 贵州恒芯微电子科技有限公司 | A method of current sample precision is improved by numerically controlled temperature-compensating |
| CN111157876A (en) * | 2019-12-31 | 2020-05-15 | 苏州市运泰利自动化设备有限公司 | System and method for testing PCBA (printed circuit board assembly) with luminous LED (light-emitting diode) |
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