大功率LED灯芯温度特性测试技术研究
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