CN103162852B - Method for detecting junction temperature of alternating current light emitting diode based on threshold voltage - Google Patents
Method for detecting junction temperature of alternating current light emitting diode based on threshold voltage Download PDFInfo
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- CN103162852B CN103162852B CN201310091284.5A CN201310091284A CN103162852B CN 103162852 B CN103162852 B CN 103162852B CN 201310091284 A CN201310091284 A CN 201310091284A CN 103162852 B CN103162852 B CN 103162852B
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Abstract
The invention provides a method for detecting the junction temperature of an alternating current light emitting diode based on threshold voltage. The method is characterized by comprising the following steps of: forming a programmable pulse current source table; connecting a temperature meter and a sensor, wherein the temperature of a constant temperature box is adjustable; in an initial temperature state, supplying one-cycle sine alternating current voltage after stabilization, and recording a current value at the initial temperature; by using current corresponding to operation starting as threshold current and using voltage corresponding to the threshold current as the threshold voltage, acquiring the threshold voltage; adjusting the temperature of the constant temperature box, starting raising the temperature at an interval of 10 to 15 DEG C in the initial temperature state, supplying the same one-cycle sine alternating current voltage, and recording the threshold voltage in each temperature state; fitting a corresponding relationship line; recovering the temperature to room temperature, supplying continuous sine alternating current voltage, and recording the threshold voltage in a room temperature state; and according to the corresponding relationship line, acquiring the junction temperature under the continuous sine alternating current voltage during normal operation, wherein the programmable pulse current source table is connected with the computer.
Description
Technical field
The present invention relates to a kind of detection method of photovalve, particularly relate to a kind of junction temperature that detects alternating-current light emitting diode based on threshold voltage based on threshold voltage alternating-current light emitting diode junction temperature detection method.
Background technology
In the method for testing junction temperature of light emitting diode, the most practical method is forward voltage drop method at present.The measuring method of forward voltage drop method is as follows: 1, when to the normal work of light emitting diode input, under constant pulse current condition, obtain the relation of light emitting diode forward voltage varies over temperature by controlling light emitting diode environment temperature around.2, under light emitting diode normal running conditions, reach after thermal equilibrium, obtain light emitting diode normal work forward voltage in normal working conditions.3,, according to the relation of the forward voltage varies over temperature obtaining in 2, the temperature corresponding with above-mentioned normal work forward voltage is the working junction temperature under light emitting diode normal temperature duty.
Said method for be the measurement of the junction temperature of direct current light emitting diode, but, forward voltage drop method can not be applied directly in alternating-current light emitting diode, because be transient change at the driving voltage of alternating-current light emitting diode, cannot normally work as direct current light emitting diode time, gather a stable forward voltage values evaluation junction temperature.The input current direction of alternating-current light emitting diode changes, instead of constant pulse current in said method condition, very difficult when this also just makes to carry out junction temperature measurement for alternating-current light emitting diode, lack at present the measuring method for the junction temperature of alternating-current light emitting diode.
Summary of the invention
The object of the present invention is to provide a kind of junction temperature that detects alternating-current light emitting diode based on threshold voltage based on threshold voltage alternating-current light emitting diode junction temperature detection method.For the operating characteristic of AC light-emitting diode, the junction temperature detection method of the junction temperature of alternating-current light emitting diode provided by the invention utilizes an instantaneous voltage value to measure junction temperature, in order to obtain the junction temperature of the alternating-current light emitting diode under normal alternating current duty, can by the funtcional relationship of voltage and junction temperature gather with normal alternate current operation state under the corresponding junction temperature of instantaneous voltage value.Above-mentioned instantaneous voltage value, the present invention proposes the threshold voltage adopting in sinusoidal waveform, using the electric current that exchanges diode unlatching work as threshold current, threshold voltage while being now unlatching work with the corresponding voltage of threshold current, the numerical value of threshold current can be distinct because of different types of alternating-current light emitting diode that different manufacturers manufacture, also can be because of different temperature condition lower threshold value electric current generation subtle change.In the time that tested light emitting diode is determined, can select as far as possible current value near the initial time of alternating-current light emitting diode unlatching work as reference, disregard the subtle change that threshold current itself occurs along with temperature variation, the threshold current of the unlatching work at each temperature is considered as unanimously.Threshold voltage when alternating-current light emitting diode is surveyed under condition of different temperatures unlatching work is also different, can draw the relation function of threshold voltage and junction temperature.The numerical value of above-mentioned threshold current is selected the initial time that should try one's best near alternating-current light emitting diode unlatching work, because junction temperature can raise after alternating-current light emitting diode work, can exert an influence to function corresponding relation, thereby the value of the threshold current open work in selectable range time should be as far as possible little.
A kind of junction temperature that detects alternating-current light emitting diode based on threshold voltage provided by the invention based on threshold voltage alternating-current light emitting diode junction temperature detection method, there is such feature, there are following steps: utilize computer control power supply output sinusoidal voltage, form programmable pulse current source table, thermometer is connected with the sensor being placed in constant temperature oven, and for showing the temperature of described constant temperature oven, the temperature in described constant temperature oven is adjustable, place in the described constant temperature oven of tested alternating-current light emitting diode under initial temperature state, utilize described thermometer to monitor and record the internal temperature of constant temperature oven, after a period of stabilisation, in the time that the junction temperature of alternating-current light emitting diode reaches identical with the temperature of constant temperature oven, connect programmable pulse current source table and alternating-current light emitting diode, to the alternating-current light emitting diode sinusoidal voltage in 1 cycle of supply, and record the current value under alternating-current light emitting diode initial temperature state by COMPUTER DETECTION, corresponding electric current is as threshold current when alternating-current light emitting diode is opened work, voltage during using the corresponding unlatching work of described threshold current of alternating-current light emitting diode is as threshold voltage, obtain the described threshold voltage of AC light-emitting diode according to the change curve of current value, the temperature of regulating constant incubator, from initial temperature state, start progressively to increase with the temperature interval of 10 DEG C-15 DEG C, maximum temperature can not exceed the highest permission working temperature of alternating-current light emitting diode, under each state of temperature after a period of stabilisation, in the time that the junction temperature of alternating-current light emitting diode reaches identical with the temperature of constant temperature oven, supply the sinusoidal voltage in identical above-mentioned 1 cycle to alternating-current light emitting diode, and recorded the current value of alternating-current light emitting diode under each state of temperature by COMPUTER DETECTION, according to the change curve of current value at each temperature and sinusoidal voltage curve, obtain respectively the described threshold voltage of alternating-current light emitting diode under each state of temperature corresponding with opening working current threshold value, according to the described threshold voltage of the alternating-current light emitting diode obtaining at each temperature, simulate the described threshold voltage of alternating-current light emitting diode and the corresponding relation line of temperature, take out alternating-current light emitting diode in constant temperature oven, the temperature of AC light-emitting diode returns to after room temperature, to the lasting sinusoidal voltage of alternating-current light emitting diode supply, and the current value while recording under room temperature state by COMPUTER DETECTION that alternating-current light emitting diode is normally worked, the change curve of the current value during according to normal work obtains the described threshold voltage of alternating-current light emitting diode under room temperature state, according to the corresponding relation line of the peak working load electric current of alternating-current light emitting diode and temperature, the corresponding temperature of described threshold voltage while obtaining with the stable normal work of alternating-current light emitting diode, obtain the junction temperature in the time that lasting sinusoidal ac is depressed the stable normal work of alternating-current light emitting diode, wherein, described programmable pulse current source table is connected with described computing machine, for supplying one-period or continuous sinusoidal voltage, the current value that obtains alternating-current light emitting diode at each temperature changes, described in each of described threshold current and correspondence, threshold voltage is drawn the relation line of temperature and described threshold voltage.
Compared with prior art, effect of the present invention is:
Provided by the invention based on threshold voltage alternating-current light emitting diode junction temperature detection method for be alternating-current light emitting diode and the junction temperature data result that obtains accurate, well solved the defect that prior art cannot detect for the junction temperature of the light emitting diode of working under exchange status.Electric current during using the unlatching work of alternating-current light emitting diode is as threshold current, voltage during using alternating-current light emitting diode and the corresponding unlatching work of above-mentioned threshold current is as threshold voltage, in the time that measured diode is determined, the threshold current of unlatching work has also been determined, the present invention proposes the threshold voltage adopting while opening work under different temperatures and detect junction temperature, because the threshold voltage of opening when work is subject to the variable effect of temperature large, corresponding relation obviously, good stability.And be that alternating-current light emitting diode is just opened period corresponding selection period of threshold voltage, thus avoided due to alternating-current light emitting diode the in running order lower heat that produced affect the possible of testing result.And generally use in daily life alternating current, compared with the prior art, alternating-current light emitting diode junction temperature detection method practicality provided by the invention is stronger, ubiquity is stronger.
Brief description of the drawings
Fig. 1 is the change curve of the current value that in the present invention, in embodiment, the sinusoidal voltage in 1 cycle and AC light-emitting diode are worked under 40 DEG C of temperature conditions;
Fig. 2 be in the present invention in embodiment at each temperature each threshold voltage of alternating-current light emitting diode unlatching work obtain figure;
Fig. 3 is the variation relation figure of alternating-current light emitting diode threshold voltage and temperature in embodiment in the present invention;
Fig. 4 is that when in the present invention, in embodiment, normal steady operation normal temperature state threshold voltages is 88.41v, the junction temperature of alternating-current light emitting diode is obtained figure.
Concrete case study on implementation
Below in conjunction with specific embodiments and the drawings, the present invention is further described.
Embodiment: detect the junction temperature of the alternating-current light emitting diode that a threshold current reference is 1mA, this alternating-current light emitting diode to be measured operating voltage is at ambient temperature 110V;
Fig. 1 is the change curve of the current value that in the present invention, in embodiment, the sinusoidal voltage in 1 cycle and AC light-emitting diode are worked under 40 DEG C of temperature conditions,
In the detection method providing in the present embodiment, hardware components comprises: computing machine, Keithley instrument Keithley SMU2636A, constant temperature oven, sensor and thermometer;
Under the control of computing machine, make power supply output sinusoidal voltage, form programmable pulse current source table, for the variation characteristic coding of 110V sinusoidal voltage, adopt the 50Hz in Keithley instrument Keithley SMU2636A simulation 1 cycle of output, 110V sinusoidal voltage;
This sinusoidal voltage 1 cycle length T=20ms, maximum voltage value is 110v, as shown in Figure 1 the change curve 1 of alternating voltage AC Source;
Thermometer is connected with the sensor being placed in constant temperature oven, and this thermometer is used for showing constant temperature oven internal temperature, and the internal temperature of above-mentioned constant temperature oven can regulate;
Alternating-current light emitting diode to be measured is positioned in constant temperature oven, the initial temperature of regulating constant incubator is 40 DEG C, monitor and record the temperature of constant temperature oven internal environment with thermometer, after a period of stabilisation, when the junction temperature of alternating-current light emitting diode is identical with the temperature of constant temperature oven while being all 40 DEG C, connect Keithley instrument Keithley SMU2636A and supply the 50Hz in 1 cycle same as described above to alternating-current light emitting diode, 110V sinusoidal voltage, and record the current value at 40 DEG C of alternating-current light emitting diodes by COMPUTER DETECTION, as shown in fig. 1, alternating-current light emitting diode unlatching work, threshold current 3 while opening work during according to retrievable 40 DEG C of the change curve 2 of current value, be referenced as 1mA, obtaining 40 DEG C of corresponding threshold voltages 4 of opening work according to sinusoidal voltage curve is 94.7v,
Fig. 2 is the variation relation figure of the electric current of alternating-current light emitting diode and voltage at each temperature in embodiment in the present invention;
The temperature of regulating constant incubator, progressively rises to 100 DEG C since 40 DEG C of intervals with 10 DEG C, the temperature of regulating constant incubator is 40 DEG C respectively, 50 DEG C, 60 DEG C, 70 DEG C, 80 DEG C, 90 DEG C and 100 DEG C, under each state of temperature, stablize a period of time, when the junction temperature of alternating-current light emitting diode is when identical with the temperature of each constant temperature oven, connect Keithley instrument Keithley SMU2636A and supply the 50Hz in 1 cycle same as described above to alternating-current light emitting diode, 110V sinusoidal voltage, and by 50 DEG C of alternating-current light emitting diodes under computing machine difference detection record, 60 DEG C, 70 DEG C, 80 DEG C, current value at 90 DEG C and 100 DEG C, according to electric current and change in voltage curve 5 under 40 DEG C of state of temperatures, electric current and change in voltage curve 6 under 50 DEG C of state of temperatures, electric current and change in voltage curve 7 under 60 DEG C of state of temperatures, electric current and change in voltage curve 8 under 70 DEG C of state of temperatures, electric current and change in voltage curve 9 under 80 DEG C of state of temperatures, electric current and change in voltage curve 11 under 10 and 100 DEG C of state of temperatures of electric current and change in voltage curve under 90 DEG C of state of temperatures, when threshold current 3 when unlatching work is all referenced as 1mA, under different temperatures, get respectively the threshold voltage that alternating-current light emitting diode is corresponding, 40 DEG C of threshold voltages 4 are 94.7V as shown in Figure 2, and 50 DEG C of threshold voltages 12 are 93.6V, and 60 DEG C of threshold voltages 13 are 92.5V, 70 DEG C of threshold voltages 14 are 91.4V, 80 DEG C of threshold voltages 15 are 90.3V, and 90 DEG C of threshold voltages 16 are 89.2V, and 100 DEG C of threshold voltages 17 are 88.1V,
Fig. 3 is the variation relation figure of alternating-current light emitting diode threshold voltage and temperature in embodiment in the present invention;
As shown in Figure 3, corresponding relation according to 16 and 100 DEG C of threshold voltages of 15,90 DEG C of threshold voltages of 14,80 DEG C of threshold voltages of 13,70 DEG C of threshold voltages of 12,60 DEG C of threshold voltages of 4,50 DEG C of threshold voltages of 40 DEG C of threshold voltages 17 with temperature, the threshold voltage of alternating-current light emitting diode and the corresponding relation line 18 of temperature are drawn out in matching,, corresponding relation line 18 as shown in Figure 3 can obtain relation equation formula T=-9.09V+900.91;
Fig. 4 is that when in the present invention, in embodiment, normal steady operation normal temperature state threshold voltages is 88.41v, the junction temperature of alternating-current light emitting diode is obtained figure,
From constant temperature oven, take out alternating-current light emitting diode, return to after room temperature until the temperature of AC light-emitting diode, to the lasting sinusoidal voltage of alternating-current light emitting diode supply, and the current value while recording under room temperature state by COMPUTER DETECTION that alternating-current light emitting diode is normally worked, the change curve of the current value during according to normal work and the curve of sinusoidal voltage, obtaining the threshold voltage of normally working under alternating-current light emitting diode normal temperature state under room temperature state is 88.41v;
As shown in Figure 4, according to the corresponding relation line 18 of the threshold voltage of alternating-current light emitting diode and temperature, obtaining with the normal steady operation normal temperature of alternating-current light emitting diode state threshold voltages 19 is the corresponding temperature of 88.41v,, the junction temperature 20 that obtains the alternating-current light emitting diode that is transfused to lasting sinusoidal voltage under room temperature state is 97.32 DEG C, junction temperature 20 as shown in Figure 4.
In addition, in method provided by the invention, programmable pulse current source table is by computer control, be that the alternating-current light emitting diode that 110v, the threshold current of opening work are 1mA can be write corresponding program to export corresponding sinusoidal ac potential source for operating voltage, at each temperature, the change curve of current/voltage also can obtain by this programmable pulse current source table simultaneously, the relation line that is acquired threshold voltage at each temperature and drawn junction temperature and threshold voltage according to change curve by computing machine, data result accuracy is high.
Effect and the effect of invention
In sum, effect of the present invention is:
Provided by the invention to obtain junction temperature data result based on threshold voltage alternating-current light emitting diode junction temperature detection method accurate, well solved the defect that prior art cannot detect for the junction temperature of the light emitting diode of working under exchange status.Electric current during using the unlatching work of alternating-current light emitting diode is as threshold current, voltage during using alternating-current light emitting diode and the corresponding unlatching work of above-mentioned threshold current is as threshold voltage, in the time that measured diode is determined, the threshold current of unlatching work has also been determined, the present invention proposes the threshold voltage adopting while opening work under different temperatures and detect junction temperature, because the threshold voltage of opening when work is subject to the variable effect large span of temperature large, corresponding relation obviously, good stability.
Be that alternating-current light emitting diode is just opened period corresponding selection period of threshold voltage, thus avoided due to alternating-current light emitting diode the in running order lower heat that produced affect the possible of testing result.
Generally use in daily life alternating current, compared with the prior art, alternating-current light emitting diode junction temperature detection method practicality provided by the invention is stronger, ubiquity is stronger.
In addition, in method provided by the invention, programmable pulse current source table is by computer control, can can write corresponding program to export the alternating-current voltage source of corresponding variation for the alternating-current light emitting diode of different operating voltage, at each temperature, the change curve of the current/voltage of alternating-current light emitting diode also can obtain by this programmable pulse current source table simultaneously, acquire threshold voltage at each temperature and draw again the relation line of junction temperature and threshold voltage by computing machine according to change curve, overcome artificial reading error, data result accuracy is high, Data duplication is high.
In specific embodiments based on threshold voltage alternating-current light emitting diode junction temperature detection method provided by the invention, ignore that threshold current is subject to temperature and the impact that changes, the threshold current value of alternating-current light emitting diode to be measured adopts 1mA, the unlatching working current of the dissimilar alternating-current light emitting diode of producing due to different manufacturers, , threshold current all can be different, so the value of threshold current is not only limited to 1mA in alternating-current light emitting diode junction temperature detection method provided by the invention, threshold current should be tried one's best near the initial time of alternating-current light emitting diode unlatching work, because junction temperature can raise after alternating-current light emitting diode work, can exert an influence to function corresponding relation, thereby, the value of the threshold current open work in selectable range time should be as far as possible little.
Above-mentioned embodiment be preferred case of the present invention for the present invention is described, be not used for limiting the scope of the invention.
Claims (1)
1. based on a threshold voltage alternating-current light emitting diode junction temperature detection method, detect the junction temperature of alternating-current light emitting diode according to threshold voltage, it is characterized in that thering are following steps:
Utilize computer control power supply output sinusoidal voltage, form programmable pulse current source table;
Thermometer is connected with the sensor being placed in constant temperature oven, and for showing the temperature of described constant temperature oven, the temperature in described constant temperature oven is adjustable;
Tested alternating-current light emitting diode is placed in the described constant temperature oven under initial temperature state, utilize described thermometer to monitor and record the internal temperature of constant temperature oven, after a period of stabilisation, in the time that the junction temperature of alternating-current light emitting diode reaches identical with the temperature of constant temperature oven, connect programmable pulse current source table and alternating-current light emitting diode, to the alternating-current light emitting diode sinusoidal voltage in 1 cycle of supply, and record the current value under alternating-current light emitting diode initial temperature state by COMPUTER DETECTION, corresponding electric current is as threshold current when alternating-current light emitting diode is opened work, voltage during using the corresponding unlatching work of described threshold current of alternating-current light emitting diode is as threshold voltage, obtain the described threshold voltage of AC light-emitting diode according to the change curve of current value,
The temperature of regulating constant incubator, from initial temperature state, start progressively to increase with the temperature interval of 10 DEG C-15 DEG C, maximum temperature can not exceed the highest permission working temperature of alternating-current light emitting diode, under each state of temperature after a period of stabilisation, in the time that the junction temperature of alternating-current light emitting diode reaches identical with the temperature of constant temperature oven, supply the sinusoidal voltage in identical above-mentioned 1 cycle to alternating-current light emitting diode, and recorded the current value of alternating-current light emitting diode under each state of temperature by COMPUTER DETECTION, according to the change curve of current value at each temperature and sinusoidal voltage curve, obtain respectively the described threshold voltage of alternating-current light emitting diode under each state of temperature corresponding with opening working current threshold value,
According to the described threshold voltage of the alternating-current light emitting diode obtaining at each temperature, simulate the described threshold voltage of alternating-current light emitting diode and the corresponding relation line of temperature;
Take out alternating-current light emitting diode in constant temperature oven, the temperature of AC light-emitting diode returns to after room temperature, to the lasting sinusoidal voltage of alternating-current light emitting diode supply, and the current value while recording under room temperature state by COMPUTER DETECTION that alternating-current light emitting diode is normally worked, the change curve of the current value during according to normal work obtains the described threshold voltage of alternating-current light emitting diode under room temperature state;
According to the corresponding relation line of the work threshold current of alternating-current light emitting diode and temperature, the corresponding temperature of described threshold voltage while obtaining with the stable normal work of alternating-current light emitting diode, obtain the junction temperature in the time that lasting sinusoidal ac is depressed the stable normal work of alternating-current light emitting diode
Wherein, described programmable pulse current source table is connected with described computing machine, for supplying one-period or continuous sinusoidal voltage, the current value that obtains alternating-current light emitting diode at each temperature changes, threshold voltage is drawn temperature and described threshold voltage described in described threshold current and corresponding each relation line.
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| CN103542952A (en) * | 2013-10-29 | 2014-01-29 | 上海理工大学 | Method for detecting junction temperature of alternating-current light-emitting diode through threshold current |
| CN103759847B (en) * | 2014-01-25 | 2016-08-17 | 深圳清华大学研究院 | Junction temperature of light emitting diode detection device and detection method thereof |
| CN104020405A (en) * | 2014-06-26 | 2014-09-03 | 厦门大学 | Pulse type power mode LED voltage-current-junction temperature characteristic testing device |
| DE102014222612A1 (en) * | 2014-11-05 | 2016-05-12 | Robert Bosch Gmbh | Temperature sensor, sensor device and manufacturing method |
| CN111983415A (en) * | 2020-08-20 | 2020-11-24 | 湖南大学 | Power device junction temperature on-line measuring system |
| CN113933676A (en) * | 2021-10-18 | 2022-01-14 | 上海金脉电子科技有限公司 | Method, device, equipment and medium for measuring junction temperature of SiC MOSFET (Metal-oxide-semiconductor field Effect transistor) device |
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| CN101926224A (en) * | 2008-01-28 | 2010-12-22 | Nxp股份有限公司 | LED driver circuit and method, and system and method for estimating junction temperature of light emitting diode |
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| US7255476B2 (en) * | 2004-04-14 | 2007-08-14 | International Business Machines Corporation | On chip temperature measuring and monitoring circuit and method |
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