CN201548657U - Measuring unit for LED forward voltage drop and junction temperature curve - Google Patents
Measuring unit for LED forward voltage drop and junction temperature curve Download PDFInfo
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- CN201548657U CN201548657U CN 200920212653 CN200920212653U CN201548657U CN 201548657 U CN201548657 U CN 201548657U CN 200920212653 CN200920212653 CN 200920212653 CN 200920212653 U CN200920212653 U CN 200920212653U CN 201548657 U CN201548657 U CN 201548657U
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- oil cylinder
- silicone oil
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Abstract
The utility model discloses a measuring unit for LED forward voltage drop and junction temperature curve, which comprises a base. A silicon oil cylinder is arranged on the base, the top of the silicone oil cylinder is provided with an oil cylinder cover which is provided with a clamp holder; and the clamp holder extends into the silicon oil cylinder. The measuring unit is characterized in that the silicon oil cylinder is internally provided with a heating tube which is connected with the heating terminal. The measuring unit has the advantages of being capable of guaranteeing that the hysteresis quality of temperature control and the measured temperature is reduced obviously, and the temperature difference of the silicon oil in the oil cylinder is smaller, and further improving the detecting precision.
Description
Technical field
The utility model relates to the electronic devices and components detection range, is specifically related to the measurement mechanism of a kind of LED forward drop and junction temperature curve.
Background technology
LED is the abbreviation of LED for illumination, is a kind of emerging efficient solid luminescent illuminating device.The technical progress of LED in recent years is rapid, develops into present 110lm/W from the light efficiency of 40lm/W in 2007.This light efficiency has obviously surpassed incandescent lamp and compact fluorescent lamp, makes it possess the ability that enters the general lighting field.But LED is when being used for the general lighting field, light efficiency height in the time of making its work, and long service life must make the junction temperature of its semiconductor PN remain on lower level (general≤75 ℃).In addition, when measuring LED luminous flux, optical color parameter and electrical quantity, same LED product, the difference of junction temperature can cause the obvious difference of these parameters, and this has also caused same LED light, look, electric parameter measurement result's obvious inconsistency.If can know the junction temperature of a certain LED when measuring light, look, electrical quantity, the light of this LED, look, electrical quantity just have measuring repeatability preferably so, also make its these measured parameters become meaningful.
Because the PN junction of LED product is all wrapped up by various materials when encapsulation, so it is impossible with traditional contact or heat radiation type metering system, again because PN junction junction temperature and its forward voltage of LED have tangible relevance, be same LED, the relation curve of its forward voltage and junction temperature is that basic weighing apparatus is fixed under certain measurement electric current, along with its forward drop of rising of junction temperature is pressed its certain rule rate decline.So all adopting, the measurement of advanced LED junction temperature at present measures the curve of demarcating its forward drop Vf and junction temperature, then under the LED special operating conditions, when surveying its light, look, electrical quantity, draw its forward drop Vf simultaneously, again according to the Vf value from Vf---corresponding its corresponding junction temperature of finding out on the curve of junction temperature.
Advanced in the world at present V
f---the junction temperature measurement method is tested LED to be connected extension line be placed in the silicone oil cylinder, heating the temperature that the silicone oil cylinder makes silicone oil subsequently reaches about 120 ℃, with silicone oil natural cooling in the relief cylinder, as long as the speed that the silicone oil temperature descends during cooling is enough slow, just can think that the junction temperature of LED and the temperature of silicone oil are basically identicals, in this process, according to the silicone oil temperature of being surveyed, instantaneous during 1 ℃～5 ℃ of every declines to the pulse of LED input predetermined electric current, and measure its forward drop under this temperature, the temperature of this measurement point and forward drop are imported in the database of computer software, since about 120 ℃, with decrease of temperature, the temperature of five equilibrium temperature survey and the forward drop of a setting of every decline, measure about 25 ℃ always, after finishing this group measurement data and importing to the database of computer software, produce a V by software
f---the junction temperature curve.This method belongs to measuring method when temperature descends, for measuring is feasible, but because the environment temperature of testing laboratory is a weighing apparatus fixed (being generally 25 ℃), and the oily temperature of silicone oil cylinder descends from high to low, this just causes when the oily temperature of silicone oil cylinder is higher, because it is big and make cooling velocity very fast with the temperature difference of testing laboratory environment temperature, for having adopted adequate measures that silicone oil cylinder temperature when temperature is higher is descended, the accuracy that guarantees to measure is unlikely too fast, but when silicone oil cylinder temperature is low, because too little and make the speed of cooling too slow with the temperature difference of room temperature, this has prolonged the Measuring Time of this testing process greatly.Because above-mentioned reason, the measuring method when this temperature descends is being measured V
f---the junction temperature process is impossible short, (approximately needing 5 hours), otherwise will produce tangible measuring error.In addition, this pick-up unit oil cylinder is fixed, and measure second group, and the time is very slow.Also having above-mentioned heating arrangement is that all there is tangible hysteresis in the temperature of heating and temperature control and measurement in the bottom of silicone oil cylinder outside, and this also causes the accuracy of this method measurement junction temperature poor.
The utility model content
The purpose of this utility model is to provide the measurement mechanism of a kind of LED forward drop and junction temperature curve, and can reduce measuring error than existing measurement mechanism.
In order to realize this purpose, scheme of the present utility model is as follows: the measurement mechanism of a kind of LED forward drop and junction temperature curve, comprise base, the silicone oil cylinder is placed on the base, silicone oil cylinder top is provided with oil cylinder cover, and oil cylinder cover is provided with clamper, and clamper stretches in the silicone oil cylinder, it is characterized in that being provided with heat-generating pipe in the silicone oil cylinder, heat-generating pipe is connected with the heating terminal.According to an embodiment of the present utility model, this heat-generating pipe comprises the annular heat-generating pipe of the bottom that is arranged on the silicone oil cylinder, and is connected with the heating terminal that is arranged on silicone oil cylinder top by straight shape pipe.Be provided with motor in the base, motor is connected with magnet steel, and magnet steel is arranged on silicone oil cylinder below, and silicone oil cylinder bottom portion inboard is provided with the corresponding magnetic of magnet steel and stirs bar.The clamper bottom is provided with a plurality of measured device set-points, and temperature sensor is set around the measured device set-point.
Measured device is placed on the measured device set-point, heating silicone oil, clamper is provided with the control line port, by the control line port measured device is detected.Promptness for the temperature that guarantees temperature control and measurement, adopt built-in heating, again in order to guarantee the consistance of oil temperature in the silicone oil cylinder, be added with the stirring bar of a Magnetic Induction in the oil cylinder bottom, utilizing external motor to rotate and drive this stirring magnetic stripe by magnetic induction rotates in oil cylinder, this velocity of rotation is adjustable, thereby has guaranteed that the in-oil cylinder silicone oil temperature difference remains in 0.2 ℃ of scope.Two silicone oil cylinders can be set on the base, after the measurement of finishing one group of sample, top oil cylinder cover integral body be comprised that clamper and heat-generating pipe change to the detection that another silicone oil cylinder can get started second group of LED, can save Measuring Time.This silicone oil cylinder is removable lining in addition, also can change the detection that a silicone oil cylinder can get started second group of LED after finishing measurement.Advantage of the present utility model is to guarantee that the hysteresis quality of the temperature of temperature control and measurement obviously reduces and can guarantees that the in-oil cylinder silicone oil temperature difference is less, thereby can improve accuracy of detection.
Description of drawings
Fig. 1 is an one-piece construction synoptic diagram of the present utility model
Fig. 2 is a measurement mechanism inner structure synoptic diagram
Embodiment
The measurement mechanism of a kind of LED forward drop and junction temperature curve, comprise base 1, silicone oil cylinder 2 is placed on the base 1, silicone oil cylinder 2 tops are provided with oil cylinder cover 3, and oil cylinder cover 3 is provided with clamper 4, and clamper 4 is provided with control line port one 4, clamper 4 stretches in the silicone oil cylinder 2, it is characterized in that being provided with in the silicone oil cylinder 2 heat-generating pipe 5, heat-generating pipe 5 is connected with heating terminal 6, connects by the heating terminal.According to an embodiment of the present utility model, this heat-generating pipe 5 comprises the annular heat-generating pipe of the bottom that is arranged on silicone oil cylinder 2, and is connected with the terminal 6 that adds that is arranged on silicone oil cylinder top by straight shape pipe.Be provided with motor 9 in the base 1, motor 9 is connected with magnet steel 10, and magnet steel 10 is arranged on silicone oil cylinder 2 belows, and silicone oil cylinder 2 bottom inside are provided with magnet steel 10 corresponding magnetic and stir bar 11, and base panel is provided with the speed regulator 12 of control motor speed.Clamper 4 bottoms are provided with a plurality of measured device set-points 7, and temperature sensor 8 is set around the measured device set-point 7.Two silicone oil cylinders are set on the base 1, are provided with two motors in the base 1, each motor 9 is connected with one group of magnet steel 10, and each magnet steel 10 is arranged on corresponding silicone oil cylinder 2 belows.
Measured device 13 is placed on the measured device set-point 7, heating silicone oil, clamper 4 is provided with control line port one 4, detects by 4 pairs of measured devices 13 of control line port one.The utility model is to measure when adopting temperature to rise, The initial segment in the heating of silicone oil cylinder, be very little with the ratio of heat time heating time or not, and it is adjustable, make silicone oil cylinder temperature rate-of-rise can guarantee the consistance of LED junction temperature and silicone oil temperature, progressively rising along with the silicone oil temperature, also strengthen with the temperature difference of room temperature thereupon, PID heating this moment and temperature-controlling system can strengthen heat time heating time and the ratio of heat time heating time not automatically, (reality has strengthened the heating power in the unit interval) thus can guarantee the temperature rate-of-rise of silicone oil in the silicone oil cylinder and remain on the speed of setting, can be not different and that the speed of oil temperature rising takes place is different because of the difference of silicone oil temperature and environment temperature.Silicone oil cylinder oil temperature is from 25 ℃ when initial, heating is 10%: 90% with the time scale that does not heat in unit interval, along with temperature rise is risen, the silicone oil cylinder is also accelerated the temperature difference increasing radiating rate of outside, strengthening time scale just smoothly infinitely rises, when oily temperature reached 150 ℃ in the silicone oil cylinder, heat time heating time and the time scale of not strengthening became 70%: 30%.The used temperature range of the utility model is 15 ℃～150 ℃.Can set and allow silicone oil weighing apparatus temperature on arbitrary temperature value of temperature limit, also can realize 0.1 ℃/minute～20 ℃/minute heating rate.Along with temperature on the temperature, measure forward voltage and can set 0.5 ℃ of measurement of every rising for once, and can progressively adjust to 20 ℃ of measurements of every rising once with 0.5 ℃ interval.Promptness for the temperature that guarantees temperature control and measurement, adopt built-in heating, again in order to guarantee the consistance of oil temperature in the silicone oil cylinder, be added with the stirring bar of a Magnetic Induction in the oil cylinder bottom, utilizing external motor to rotate and drive this stirring magnetic stripe by magnetic induction rotates in oil cylinder, this velocity of rotation is adjustable, thereby has guaranteed that the in-oil cylinder silicone oil temperature difference remains in 0.2 ℃ of scope.This measurement mechanism is because the speed that the silicone oil temperature rises is almost consistent, thereby can guarantee under the condition of rational temperature climbing speed, to obtain testing result accurately, and can be starkly lower than at present the Measuring Time of existing pick-up unit in the world detection time (being about from 25 ℃ to 130 ℃ about 1---3 hour).Existing in the world at present pick-up unit is single silicone oil cylinder structure, and this measurement mechanism adopts two silicone oil cylinder structures, after the measurement of finishing one group of sample, changes the detection that a silicone oil cylinder can get started second group of LED.This measurement mechanism imports to database and generates V after temperature and LED forward drop that each measurement temperature spot records
f---the method for junction temperature curve is basic with method is consistent in the world.
Claims (4)
1. the measurement mechanism of LED forward drop and junction temperature curve, comprise base, the silicone oil cylinder is placed on the base, silicone oil cylinder top is provided with oil cylinder cover, it is characterized in that oil cylinder cover is provided with clamper, heating terminal and heat-generating pipe, clamper and heat-generating pipe stretch in the silicone oil cylinder, and heat-generating pipe is connected with the heating terminal.
2. measurement mechanism as claimed in claim 1 is characterized in that: be provided with motor in the base, motor is connected with magnet steel, and magnet steel is arranged on silicone oil cylinder below, and silicone oil cylinder bottom portion inboard is provided with the corresponding magnetic of magnet steel and stirs bar.
3. measurement mechanism as claimed in claim 1 is characterized in that: the clamper bottom is provided with a plurality of measured device set-points, and temperature sensor is set around the measured device set-point.
4. measurement mechanism as claimed in claim 1 is characterized in that: two silicone oil cylinders are set on the base, are provided with two motors in the base, each motor is connected with one group of magnet steel, and magnet steel is arranged on corresponding silicone oil cylinder below.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920212653 CN201548657U (en) | 2009-12-07 | 2009-12-07 | Measuring unit for LED forward voltage drop and junction temperature curve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920212653 CN201548657U (en) | 2009-12-07 | 2009-12-07 | Measuring unit for LED forward voltage drop and junction temperature curve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201548657U true CN201548657U (en) | 2010-08-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200920212653 Expired - Lifetime CN201548657U (en) | 2009-12-07 | 2009-12-07 | Measuring unit for LED forward voltage drop and junction temperature curve |
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| Country | Link |
|---|---|
| CN (1) | CN201548657U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565654A (en) * | 2010-12-27 | 2012-07-11 | 同方光电科技有限公司 | Measurement system and measuring method for derating curve of LED (light-emitting diode) |
| CN103048060A (en) * | 2011-10-11 | 2013-04-17 | 常州光电技术研究所 | Junction temperature measuring device for LED (Light Emitting Diode) lamp |
| CN105806887A (en) * | 2016-04-22 | 2016-07-27 | 全球能源互联网研究院 | Measuring method and measuring jig for thermal resistance junction to case of power semiconductor device |
-
2009
- 2009-12-07 CN CN 200920212653 patent/CN201548657U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565654A (en) * | 2010-12-27 | 2012-07-11 | 同方光电科技有限公司 | Measurement system and measuring method for derating curve of LED (light-emitting diode) |
| CN103048060A (en) * | 2011-10-11 | 2013-04-17 | 常州光电技术研究所 | Junction temperature measuring device for LED (Light Emitting Diode) lamp |
| CN103048060B (en) * | 2011-10-11 | 2014-05-28 | 常州光电技术研究所 | Junction temperature measuring device for LED (Light Emitting Diode) lamp |
| CN105806887A (en) * | 2016-04-22 | 2016-07-27 | 全球能源互联网研究院 | Measuring method and measuring jig for thermal resistance junction to case of power semiconductor device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100811 |