单片机控制的数控电流源毕业设计文档

论文编号:JD038    字数:8160,页数:33

摘 要
随着电子技术的不断进步，对电子仪器的要求也不断提高。电源作为电路的动力源泉更是扮演着越来越重要的角色，不论是学校实验室还是维修中心都离不开实验电流源，然而传统的电流源不论是在控制精度还是输出特性上都无法满足要求。
随着单片机技术的不断发展和D/A，A/D技术的不断成熟使得数控电源成为可能，数控电流源不论是在控制精度还是在可操作性上都有传统电源无法比拟的优势。
本文在参考传统电流源以及普通数控电流源的基础上，在充分考虑性价比的同时极大地提高了数控电流源的准确性，通过软件修正以后在使用普通元件的情况下数控电流源的性能也达到了比较高的水平。
关键字：高精度； DAC0832；D/A转换；恒流源；软件修正  
Abstract: Progress unremittingly the request to the electronics instrument technically to also raise continuously along with the electronics, the power supply is the motive source of the electric circuit to play a more and more important role more, is the school a laboratory still repair centerses to all can not get away from an experiment power supply in spite of, however the traditional power supply is control accuracy or output the tops of the characteristic in spite of and can't satisfy a request.
Along with single slice machine technical of develop continuously with the D/A, the A/D is technical continuously the maturity make the number control power supply to make possible, count to control the electric current source and is control accuracy in spite of still on the maneuverability all there is traditional power supply can't compare to of advantage.
This text in making reference to the foundation that the traditional electric current source and common number control the electric current source, at the full consideration price compare of in the meantime raised a number to control the accuracy of the electric current source biggest, pass the software correction hereafter while use the circumstance of the common component the number controls the electric current source of the function also comes to a higher level.
Key words:  High accuracy；DAC0832；D/A converter；Constant； current resource 

目录
摘要............................................................ I
Abstract ........................................................ II

1. 绪论 ...........................................................1
1.1. 电流源简介 ...................................................1
1.2. 数控电流源的必要性........................................... 1
1.3. 数控电流源的可行性........................................... 1
2. 数控电流源硬件系统总体设计....................................  2
2.1. 传统电流源的设计方案........................................  2
2.2. 数控电流源方案 .............................................. 2
2.3. 数控电流源的方案比较........................................  3
2.4. 电流源的软件系统组成 ........................................ 4
2.5. 本系统的特点................................................  5
3. 数控电流源硬件模块设计........................................  6
3.1. 电源模块 .................................................... 6
3.1.1. 电源原理................................................... 6
3.1.2. 电源方案确定 ...............................................7
3.1.3. 电源模块具体电路 ...........................................8
3.1.4. 电源模块PCB设计 ............................................8
3.1.5. 显示模块 .................................................. 8
3.2. D/A电路...................................................... 10
3.2.1. DAC0832简介 ................................................10
3.2.2. 具体电路设计 .............................................. 12
3.2.3. 控制电压产生电路..........................................  13
3.3. 电流输出模块 ................................................ 14
3.3.1. 具体电路图................................................. 15
3.3.2. 电流输出模块Pcb图 ..........................................16
3.4. 主控部分..................................................... 16
3.4.1. AT89C52单片机系统及外围电路 ................................16
3.4.2. 单片机时钟脉冲电路........................................  16
3.4.3. 复位电路 .................................................. 16
3.4.4. 主控部分具体电路 .......................................... 18
4. 数控电流源的软件系统设计 ...................................... 19
4.1. 具体模块划分 ................................................ 19
4.2. 数值处理..................................................... 20
5. 系统测试 .......................................................21
5.1. 设计创新点....................................................21
5.2. 系统性能检测 ................................................ 21
5.2.1. 减小纹波所采用的措施 ...................................... 22
5.2.2. 纹波电流测试............................................... 22
5.3. 误差分析 .................................................... 24
6. 结论 .......................................................... 25

致谢 ............................................................. 26
参考文献...........................................................27
附录1 ............................................................ 28
附录2............................................................  29

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