大功率LED灯芯温度特性测试技术研究

摘要大功率LED灯的温度特性是决定其能否可靠运行的关键之一，本文针对某型LED灯芯产品的温度特性评价需要，探讨相关的测试技术与方法。
我们采用微小热电偶接触测量法构建LED灯芯温度分布测试系统，其中，测温探头为0.25mm线径的铜-康铜构成的T型热电偶；冷端补偿应用AD592温度传感器；采用AD538实时模拟计算模块构成非线性信号放大单元，在要求的温度测量范围内非线性拟合热电偶分度表，使系统输出（电压）信号与被测温度成恒定比例关系。文中仔细探讨了微小热电偶探头的制作（焊接）方法，信号调理电路（包括冷端补偿和非线性放大）的设计、制作与调试，还进行了测温系统的标定、某型LED灯芯温度测试实验等工作。5452
关键词 LED灯芯温度特性热电偶温度测试   非线性拟合
毕业设计说明书（论文）外文摘要
Title      Research on the temperature characteristics of High-power LED Light-Core
Abstract
The temperature characteristics of high power LED light is one of the key to determine their ability to reliable operation.For characteristics of a certain type of LED Light-Core evaluation needs,topics explore the related test technology and methods.
The test system of LED wick temperature distribution built by a tiny thermocouple contact measurement construct.T-type Thermocouple probe is produced by 0.25mm diameter copper and constantan.Cold junction compensation applications AD592 temperature sensor.Subject uses AD538 real-time simulation module to constitute a non-linear signal amplification unit.Nonlinear fitting of the thermocouple tables was performed within the required temperature measuring range.Make the system output signal and the measured temperature as a constant ratio between.Article carefully explored the production methods of small thermocouple probe/the design of signal conditioning circuit/production and debugging.Also the article carried out the calibration of the temperature measurement system, a certain type of LED wick temperature testing laboratories and other work.
Keywords: temperature characteristics of LED wick   Thermocouple
            Temperature test    Nonlinear fitting
目次

1 绪论   1
   1.1 课题研究背景   1
   1.2 国内外研究现状的分析   2
   1.3 研究内容和要求   3
   1.4 论文结构   3
2 总体方案及原理   4
   2.1 系统总体方案   4
   2.2 热电势与温度非线性拟合原理   5
3 热电偶传感器设计   7
   3.1 热电偶型号及材料的选取   7
   3.2 热电偶探头的制作   8
4 硬件电路设计   11
   4.1 硬件电路热电偶冷端补偿系统   12
   4.2 非线性拟合电路   15
5 实验调试   20
   5.1 硬件电路调试   20
   5.2 传感器标定   23
   5.3 LED灯温度测量实验   26
       5.3.1 实验目的   26
       5.3.2 实验准备   28
       5.3.3 实验步骤   30
       5.3.4 实验数据及分析   31 大功率LED灯芯温度特性测试技术研究:http://www.youerw.com/wuli/lunwen_2478.html