50位全自动高温反偏试验台软件及硬件设计

【作者】 李家红；

【导师】 康波； 胡泽；

【作者基本信息】 电子科技大学 ， 软件工程， 2010， 硕士

【摘要】 作为节能灯(包括电子镇流器)的重要部件,大功率开关三极管的质量对节能灯的质量和寿命起着关键的作用。高温漏电流是影响三极管质量的重要参数。不同厂家都除了对出厂前的漏电流特性进行常温下测试外,很多公司还会抽取一定比例的样管进行高温反偏下漏电流测试,即高温反偏老化试验。早期的试验设备受当时技术的制约,功能较为简单,设计繁琐。应用现代工控机技术和可编程芯片及新型数模/模数转换器,在大大简化设计的同时,可增加多种功能,提高设备的稳定性。本论文正是针对公司对产品可靠性要求,用现代自动化控制技术和芯片技术,设计制作一台50位全自动高温反偏实验台。主要设计有:1、精密电流检测器,检测范围0—9.999mA;2、多功能测试桥转换器;3、程控高压直流电源,电压范围0—1000V/500mA;4、50路自动巡检控制;5、16位高精度数/模、模/数转换控制6、自动控制和巡检记录软件;电流检测器共50组,每组4路,由高精度金属膜电阻、微型继电器和运放组成,并采用负反馈电流检测方式。多功能测试转换桥使用高耐压微型继电器,根据实验项目自动连接或切断实验器件各个引脚,增强实验台的灵活性。程控高压直流电源主要为实验提供反偏电源,采用线性电源方式,通过对运放输出增压、扩流,使输出满足设计要求。同时,通过合理控制电源输入电压,大大降低线性电源的发热,提高效率。自动控制使用5X86工业计算机,通过扩展ISA总线,扩展I/O口,实现对各功能模块的程序控制。同时,I/O扩展、数字逻辑控制等使用可编程器件CPLD,大大简化了电路设计。更多还原

【Abstract】 As the key components of energy-saving lamps (including electronic ballasts), The power switch transistor plays a key role in energy-saving lamp life.The most important Parameter of transistor is Leakage current in high temperature. Different manufacturers are in addition to the factory of the leakage current characteristics at room temperature under the testing, companies set aside a certain proportion of the high temperature reverse bias test, the test equipment early have a simple function and complicated designed. Application of modern industrial computer and Complex programmable logic device and new DAC / ADC, as same time of simplify the design, increases the stability and multiple functions of equipment while simplifying design.This paper is the product reliability requirements for the company, with modern automatic control technology and chip technology, designed as a fully automatic high-temperature reverse bias of 50 experimental units. The main designs are:1、Precision current detection, the detection range 0-9.999mA;2、Multi-function testing bridge converter;3、Programable high voltage DC supply, voltage range: 0~1000V/500mA;4、50 Road automatic inspection control;5、16-bit high precision D / A, A / D conversion control;6、The software of automatic control and inspection records;There are altogether 50 groups of current detectors, 4 branches each group. The detectors employ negative feedback current detection technique, composed of high precision metal film resistors, micro relays and operational amplifiers. In the multi-functional transforming test bridge high voltage micro relays are used, which can automatically connect or disconnect each pin of the DUT according to the purpose of tests, and therefore increases flexibility of the instrument. Mainly providing a reverse bias for the DUT, programmable high voltage DC supply produces an output which satisfies the design requirements by raising output voltage and current of the operational amplifier in a linear way. Meanwhile, the efficiency of the linear supply is improved by reducing its heat dissipation through controlled input voltage. The automation unit is an industrial computer which controls various functional modules through extended ISA bus and I/O interfaces. The architecture of the circuit is greatly simplified through the application of I/O extension, digital control logic and programmable CPLD.更多还原