毕业设计 简易数控直流电源设计.docVIP

Abstract Along with the development of the ages, the numerICal eleCTRonics technique has already make widely available to our life, work, research, each realm, this text will introduce a kind of number to control direct current steady press power supply, this power supply from imitate power supply,show electric circuit,control electric circuit,few molds conversion electric circuit and enlarge electric circuit to constitute for four-part cent.ACCurate say be imitate power supply to provide each electric voltage that Chip power supply,the figures tube,enlarger need;the manifestation electric circuit used for showing the power supply outputs electric voltage of size.Analyzed a numerical technique and imitates the concept that the technique converts mutually in the meantime.With traditional steady press power supply to compare to have an operation convenience, the power supply stability high characteristics, its exportation electric voltage size adoption figures show. Keyword: SCM AT89C51?74 LS164?D/A C 目?录? 1?绪论 1.1研究背景及意义……………………………………………………………1 1.2国内外研究现状……………………………………………………………2 1.3课题的研究方法……………………………………………………………2 2?基础知识 2.1 芯片的原理及应用 2.1.1 AT89C51简介……………………………………………………3 2.1.2?HA17741 ………………………………………………………5 2.1.3 TL082 ……………………………………………………………6 2.1.4?74LS1364………………………………………………………7 2.1.5. DAC0832……………………………………… …… …………9 2.1.6?7805、7812管脚图……………………………………………9 2.1.7?7915管脚图……………………………… ……………………10 2.2多位LED显示的串口实现原理 2.2.1 实现方式 …………………………………………………………11 2.2.2 引脚功能…………………………………………………… ……11 3?电路原理和硬件实现 3.1 电路框图…………………………………………………… ……………12 3.2 整体电路图…………………………………………… ……………… …………13 3.3 内部电路及原理分析 3.3.1电路组成……………………………………………………… ……14 4 程序设计 4.1 程序流程图…………………………… …………………… ……… …… 21 4.2程序运行原理……………………………………………………… ………23 5?电路的调试 5.1 实验仪器………………………………………………………………… …24 5.2 电路测试数据………………………… ………………… ……… …… …24 6?系统误差分析 …………………………………………… ……… ……… …25 7．结论…………………………………………………………………………?…25 8. 致谢………………………………………………………………………………26 9. 参考文献……………………………………………………………………… 27 10．附录 附录A：源程序……………………………………………………………