基于AT89C52单片机的数控恒流源的研制毕业论文.docx
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南京理工大学紫金学院毕业设计说明(论文)作者:学号:系:电子工程与光电技术系专业:题目:指导者:(姓名) (专业技术职务)评阅者:(姓名) (专业技术职务)2015 年 5 月南京理工大学紫金学院毕业设计(论文)评语学生姓名:班级、学号:题目:综合成绩:指导者评语:指导者(签字):年月日毕业设计(论文)评语评阅者评语: 评阅者(签字):年月日答辩委员会(小组)评语: 答辩委员会(小组)负责人(签字): 年月日毕业设计说明书(论文)中文摘要恒流源在日常生活中扮演着重要的角色,很多电子设备需要工作时候的电流处于稳定状态.本文介绍了一种基于AT89C52单片机的数控恒流源的研制,该系统主要是由单片机系统电路、DAC转换电路﹑恒流电路。设计的恒流系统具有精度高、稳定性高的特点。在数字输入信号部分主要是利用单片机输出的数字量同时配有按键数字键控功能。DAC转换模块将单片机输出的数字量转换为模拟量,以作为恒流电路的基准电压。恒流电路部分以集成运放和达林管组成的电流负反馈电路来实现电流的恒定输出。本设计为了增加人机交互采用数码管显示,可以使得数控恒流的效果更加直观。关键词:AT89C51,单片机,DA转换,恒流源毕业设计说明书(论文)外文摘要Title Design of constant current sourceAbstractThe constant current source plays an important role in our daily life, many electronic devices need to work when the current is in a stable state.This paper introduces the development of a numerical control constant current source based on AT89C52 MCU, the system is mainly composed of single chip microcomputer system circuit, DAC conversion circuit, constant current circuit. Constant flow system design has the characteristics of high precision, high stability. The input signal in the digital part is mainly the use of single-chip digital output at the same time with the number of keys keying function. DAC conversion module converts the digital output of the microcontroller for analog, to a reference voltage as a constant current circuit. The constant current circuit with integrated operational amplifier and Darin tube current negative feedback circuit to realize the constant current output. The design of human-computer interaction in order to increase the use of digital tube display, can make the results more intuitive control constant current.Keywords:AT89C51;SCM; DA conversion; constant current source目次1 绪论11.1 研究背景及意义11.2 设计要求21.3 论文章节安排22 系统设计方案论证42.1 恒流源模块方案论证42.2 控制器模块方案论证62.3 显示模块方案72.4 键盘模块方案72.5 电源模块方案73 系统设计方案及硬件结构83.1 系统设计框图83.2 电源供给模块83.2 单片机最小系统电路93.3 TLC5615 DAC简介及其与单片机的接口电路113.4 恒流电路133.5 数码管显示电路143.6 按键控制电路153.7
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