CN204831599U

CN204831599U - LED lamps and lanterns junction temperature test system

Info

Publication number: CN204831599U
Application number: CN201520251070.4U
Authority: CN
Inventors: 王艳奇; 陈亮; 李向; 赵靖寅; 徐珍宝; 沈洋; 周占春; 苏玲爱; 金尚忠
Original assignee: China Jiliang University
Current assignee: China Jiliang University
Priority date: 2015-04-20
Filing date: 2015-04-20
Publication date: 2015-12-02
Anticipated expiration: 2025-04-20

Abstract

The utility model discloses a LED lamps and lanterns junction temperature test system measures the LED junction temperature through knot voltage and the corresponding linear relation tj -Vf of temperature who utilizes the diode, comprises thermostatic control case and junction temperature measuring device. Its measurement process divides two parts: tj -Vf calibrates and tj measures. The method is measured fast, and (6-8 hours) are relatively lacked to total run time, provide a plurality of measurement passageways moreover, at most can 5 lamps and lanterns of simultaneous measurement, and the data of simultaneous measurement are also very accurate, can provide the most audio -visual LED junction temperature information for lamps and lanterns manufacturers. The measuring process is also relatively more simple and convenient, and measurement procedure is swift in the experiment, can realize quick detection in batches.

Description

A kind of LED lamp junction temperature test system

Technical field

The utility model relates to light emitting diode (LED) light fixture, is specifically related to a kind of LED lamp junction temperature test system.

Background technology

LED illumination is described as the illumination of a new generation, and its development very fast to such an extent as to half a year or some months will once technical renovation, and the photoelectric properties of LED are constantly improved.Domestic LED producer also emerges in large numbers like the mushrooms after rain, constantly releases various LED lamp, LED lamp is applied more and more wider, also gets more and more in the share of illumination market.Even so, but the development of domestic LED illumination is manufactured and the deficiency of the core technology such as encapsulation due to LED crystal, and overall development lags behind developed country.Domestic LED producer is also very different, and some producers fund and technical deficiency also play greatly LED board, so that the LED lamp quality produced is not good, brings negative effect to LED industry.Affect in the factor of LED lamp quality many, LED junction temperature is very important one.Experiment shows, the light efficiency of LED and life-span are all inversely proportional to LED junction temperature.In light fixture finished product, how to measure LED junction temperature just become a very important problem.A measuring system based on light fixture finished product LED junction temperature of the utility model designed, designed, utilize the junction voltage of diode and the corresponding linear relationship Tj-Vf of temperature to measure LED junction temperature, be made up of constant temperature control box and junction temperature measurement device, its measuring method is simple and direct, measure rapidly effectively, be highly suitable for research and development and the quality control of LED lamp.

Summary of the invention

The utility model technical issues that need to address are: provide a kind of LED lamp junction temperature test system, be made up of constant temperature control box and junction temperature measurement device.

Main control chip in control desk is Arm9 series, the real-time performance that this chip is outstanding, superior effect, senior innovative peripheral hardware, maximum integration is easy to exploitation, and whole product line has the high degree of compatibility of peripheral hardware and software, can provide maximum activity for test macro.The UCOS-II designed by the Embedded Application be specially computing machine is as operating system, and UCOC-II operating system has that execution efficiency is high, take up room little, the feature such as real-time performance is excellent and extensibility is strong.

The technical solution of the utility model is: by utilizing the corresponding linear relationship Tj-Vf of the junction voltage of diode and temperature to measure LED junction temperature, measuring process in two sub-sections: Tj-Vf calibration and Tj measurement.Described system comprises controlled AC power supplies (1), for the constant temperature control box (2) that the junction voltage of diode and the calibration of the corresponding linear relationship Tj-Vf of temperature are measured, junction temperature measurement device (3), hurricane globe (4) in GB7000.1 standard Appendix D, for measuring the thermopair (5) of lamp temperatures change, control desk (6) and be used for the display screen (7) of displays temperature curve and measurement result, these seven building blocks connect successively.

The method is measured fast, total experimental period shorter (6 ~ 8 hours), and provides multiple Measurement channel, can measure 5 light fixtures at most simultaneously, and the data simultaneously measured are also very accurate, can provide LED junction temperature information the most intuitively for light fixture manufacturer.The process measured is also easier, and experiment measuring program is quick, can realize the detection of rapid batch.

The LED lamp junction temperature test system provided according to the utility model, described test console is computing machine, comprises keyboard, display screen and mouse.

The LED lamp junction temperature test system provided according to the utility model, described control desk within carries out database purchase, remote monitoring and data analysis.

The LED lamp junction temperature test system provided according to the utility model, this test macro comprises pilot lamp, and this pilot lamp connects with test console and corresponding with LED lamp.

The LED lamp junction temperature test system provided according to the utility model, the wire that LED lamp is connected with test macro AC power supplies is connected to earth leakage circuit-breaker; Power meter is provided with between earth leakage circuit-breaker and power supply.

This junction temperature testing apparatus can realize overload, excess current, superpotential, short-circuit protection.

Accompanying drawing explanation

Fig. 1 is the structural representation of the utility model LED lamp junction temperature test system;

Fig. 2 is the workflow diagram of test macro shown in Fig. 1;

Fig. 3 is the electrical block diagram of test macro shown in Fig. 1.

Embodiment

Embodiment 1:

A wherein LEDs in selection LED lamp is as measuring object, and this LED should have certain representativeness, preferably selects the center of LED array, is generally that this position heat is more concentrated, representative.Removed by the annexes such as the diffuser of light fixture, taken out from substrate circuit by the LED of selection, LED two terminal circuit being about to choose disconnects separately, to access surveying instrument.

The access of measuring circuit, is welded on the circuit board of LED lamp by slotted line, now, also should add a thermopair near on the limit of LED particle, generally select TP point or pad point, to monitor the change of temperature in calibration process.

Light fixture is put into constant temperature control box, is plugged p-wire.Close chamber door, open computer and control box, enter Tj-Vf program, wherein have several parameter to select: the scope of temperature, step-length and constant temperature time.The scope of temperature generally will contain the numerical value of light fixture LED junction temperature, and because general LED junction temperature can not more than 85 DEG C, select 25 DEG C ~ 85 DEG C calibrations here.Step-length can select 10 DEG C ~ 15 DEG C ladders, and calibration can obtain 5 ~ 7 data points like this, carrys out matched curve and then calculates Tj.It is finally the selection of constant temperature time, the structure of this and light fixture has much relations, some fitting structures are large or LED heat dissipation structure condition is bad, constant temperature time should be extended, when making calibration, LED ties surface temperature and ambient temperature reaches sufficient thermal equilibrium thus do not have temperature difference, such calibration curve will be more accurate, and can arrange constant temperature time is 30 ~ 60 minutes.The light fixture that general structure is little, thermal equilibrium is fast can select constant temperature 20 minutes.Then click and start to carry out calibration measurement.

After calibration completes, close instrument, open chamber door, make light fixture cool to room temperature, light fixture and measuring equipment are moved in the hurricane globe in GB7000.1 standard Appendix D, carry out the measurement of Tj.Can require to bond many places thermopair again according to producer before measuring, to measure lamp temperatures change.Then lamp attachment (as lens, O-ring seal etc.) before to be assembled, returns to the state that light fixture is intact, install with the mounting means of light fixture when practical application, so as light fixture when surveying Tj can and actual use in state consistency.

After carrying out above work, connect p-wire, connect light fixture power lead, open surveying instrument, in process of measurement, click Tj measure, and the file calibrated before calling, click and start.Program detects automatically, the thermally-stabilised rear measurement Vf value of light fixture, and according to the numerical value of calibration curve auto-returned Tj.

Embodiment 2:

The method is measured fast, total experimental period shorter (6 ~ 8 hours), and provides multiple Measurement channel, can measure 5 light fixtures at most simultaneously.The data that the method is measured are also very accurate, can provide LED junction temperature information the most intuitively for light fixture manufacturer.Experimentation is easier, and need welding except LED takes out end, other all adopt socket wiring.Experimental arrangement is quick, can be competent at the detection of rapid batch.

Database purchase, remote monitoring and data analysis are carried out in control desk inside of the present utility model, are the cores of whole test macro.

Should be noted that in the measurements:

The selection of LED particle will be applicable to, and welding, can visual and manual inspection it should be noted that not rosin joint, and can detect wiring with multimeter is if desired that break-make is reliable.

When movable lamps and testing tool, must note p-wire, line is not pressed or is pulled, and avoids p-wire loose contact.Because one group of passage has six roots of sensation p-wire and a thermopair, therefore rationally will place p-wire.

The selection of constant temperature time during calibration, because fitting structure is inconsistent, so want choose reasonable constant temperature time.Time is short, and Tj can be caused lower than outer surface temperature, and Tj-Vf curve is moved right, and the time, shorter movement was more, and measured value when measuring Tj like this below can be lower than actual value, impact experiment accuracy.Overlong time then wastes Measuring Time, also may cause the overabundance of data measured, produce data from overflow so that make calibration failure (because of experimental data be for this reason first be stored in surveying instrument internal memory on instead of in computer).

The method measures LED junction temperature also certain limitation, will carry out LED particle taking-up, scrape the operations such as the electrodeposited coating of substrate off, can destroy LED lamp during measurement.The method is not suitable for the junction temperature measurement of high-power integrated LED module.Because high-power integrated LED module be by much little LED particle by certain string and series-parallel connection assemble and be packaged together, therefrom take out a LEDs unrealistic to measure, if it is measured as a large LED particle, then may because the too large data from overflow of voltage, or the electric current flowing to every LEDs is too little and cause the precision of measurement not high, correctly cannot carry out Tj-Vf calibration.The junction temperature measurement scheme that ShiDaiZhiGuang company will release in the near future for high-power LED module.This measurement scheme successfully solves the measurement of LED junction temperature in light fixture finished product, for the life-span and light decay etc. of LED lamp provide direct reference, ensure that the quality of LED lamp, also for producer has saved the time, is more adapted to the allegro demand in market.

Claims

1. a LED lamp junction temperature test system, it is characterized in that, comprise controlled AC power supplies (1), for the constant temperature control box (2) that the junction voltage of diode and the calibration of the corresponding linear relationship Tj-Vf of temperature are measured, junction temperature measurement device (3), hurricane globe (4) in GB7000.1 standard Appendix D, for measuring the thermopair (5) of lamp temperatures change, control desk (6) and be used for the display screen (7) of displays temperature curve and measurement result, these seven building blocks connect successively.

2. a kind of LED lamp junction temperature test system according to claim 1, it is characterized in that, described control desk is computing machine, comprises keyboard, display screen and mouse.