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基于单片机的电压频率监测系统设计论文--学位论文.doc
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基于单片机的电压频率监测系统设计论文--学位论文.doc
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基于单片机的电压频率监测系统设计
基于单片机的电压频率监测系统设计
目录
摘要 ................................................................................................................................I
Abstract..........................................................................................................................II
第一章 绪论..................................................................................................................1
1.1 问题的提出......................................................................................................1
1.2 设计的意义.....................................................................................................1
1.3 设计的主要内容.............................................................................................1
第二章 系统概述..........................................................................................................3
2.1 电压/频率的测量方法....................................................................................3
2.1.1 频率的测量原理...................................................................................3
2.1.1.1 周期测量法................................................................................4
2.1.1.2 直接测频法................................................................................7
2.1.2 电压测量方法.....................................................................................10
2.1.2.1 A/D 转换法..............................................................................10
2.1.2.2 V/F 转换法...............................................................................14
2.2 方案选择........................................................................................................16
2.3 系统框图........................................................................................................17
第三章 系统硬件电路的设计....................................................................................17
3.1 单片机处理控制电路...................................................................................18
3.2 频率信号预处理电路...................................................................................20
3.2.1 小信号放大电路.................................................................................20
3.2.2 整形电路.............................................................................................21
3.4 A/D 转换电路................................................................................................22
3.5 复位电路部分...............................................................................................26
3.6 晶振电路部分...............................................................................................28
3.7 LCD 显示电路...............................................................................................29
3.7.1 LCD 选型............................................................................................29
3.7.2 接口说明............................................................................................30
3.7.3 指令描述............................................................................................31
3.7.4 接口时序说明....................................................................................33
3.8 电源电路的设计...........................................................................................35
3.9 串口通信电路...............................................................................................37
第四章 系统控制软件设计........................................................................................41
4.1 系统软件框图................................................................................................41
4.2 频率测量子流程图.......................................................................................42
4.3 A/D 转换子流程图........................................................................................44
4.4 显示子程序...................................................................................................45
4.5 延时子程序....................................................................................................46
第五章 误差分析........................................................................................................47
5.1 ±1 误差...........................................................................................................47
5.2 时基误差.......................................................................................................47
基于单片机的电压频率监测系统设计
5.3 周期测量法的误差.......................................................................................48
5.4 多周期同步法的误差...................................................................................48
5.5 进一步提高频率测量精度的方案................................................................49
参考文献......................................................................................................................51
中英文翻译..................................................................................................................52
总结体会......................................................................................................................53
致谢..............................................................................................................................55
附录..............................................................................................................................56
图目录
图 2. 1 AT89C52 定时/计数器基本组成......................................................................3
图 2. 2 测周法测量频率时序图...................................................................................4
图 2. 3 周期测量法流程图...........................................................................................5
图 2. 4 多周期同步法测频原理图...............................................................................6
图 2. 5 同步法测量频率时序图...................................................................................6
图 2. 6 多周期同步测量法的流程图...........................................................................7
图 2. 7 直接测频率测频原理图...................................................................................8
图 2. 8 计数法设计软件流程图...................................................................................8
图 2. 9 直接测频法原理框图.......................................................................................9
图 2. 10 三位并行 A/D 转换器原理图........................................................................10
图 2. 11 逐次逼近型 A/D 转换器的工作原理图.......................................................12
图 2. 12 双积分型 AD 转换器的框图.......................................................................13
图 2. 13 双积分 AD 转换器波形图...........................................................................14
图 2. 14 施密特触发器型压控振荡器的原理性电路和电压波形...........................15
图 2. 15 电容交叉充、放电型压控振荡器的原理图...............................................15
图 2. 16 LM331 的电路结构框图................................................................................16
图 2. 17 电压、频率检测系统框图...........................................................................17
图 3. 1 AT89C52 单片机引脚图.................................................................................19
图 3. 2 频率信号预处理电路.....................................................................................21
图 3. 3 降压电路.........................................................................................................22
图 3. 4 小信号放大电路.............................................................................................22
图 3. 5 整形电路..........................................................................................................23
图 3. 6 施密特触发器对波形整形的原理图..............................................................23
图 3. 7 ADC0809 芯片管脚图.......................................................................................24
图 3. 8 ADC0809 内部结构图 .....................................................................................25
图 3. 9 X25045 引脚图................................................................................................27
图 3. 10 X25045 看门狗电路硬件连接图..................................................................28
图 3. 11 晶振电路.......................................................................................................29
图 3. 12 显示电路........................................................................................................29
图 3. 13 LCD 管脚图....................................................................................................30
图 3. 14 读操作时序...................................................................................................33
图 3. 15 写操作时序...................................................................................................34
图 3. 16 直流稳压电源基本组成框图........................................................................35
图 3. 17 常见整流滤波电路.......................................................................................36
基于单片机的电压频率监测系统设计
图 3. 18 电源电路.......................................................................................................36
图 3. 19 串口通信电路...............................................................................................37
图 3. 20 九针串口引脚功能图...................................................................................38
图 3. 21 MAX232 的引脚图..........................................................................................39
图 4. 1 系统总流程图..................................................................................................41
图 4. 2 频率测量子流程图..........................................................................................43
图 4. 3 A/D 转换子流程图..........................................................................................44
图 4. 4 显示流程图.....................................................................................................46
图 5. 1 原理波形图.....................................................................................................49
图 5. 2 量化时延原理.................................................................................................50
表目录
表 2.1 并行比较型 AD 转换器的输入输出关系.......................................................11
表 3.1 P3 口的第二功能..............................................................................................20
表 3.2 X25045 指令及其含义.....................................................................................28
表 3.3 X25045 状态寄存器.........................................................................................28
表 3.4 LCD 接口说明表................................................................................................30
表 3.5 RAM 地址映像表.............................................................................................32
表 3.5 LCD 接口时序表..............................................................................................34
表 3.6 RS-232C 接口信号表.......................................................................................38
表 5.1 相对误差...........................................................................................................49
兰州理工大学毕业设计说明书
I
摘要
随着信息化、数字化在各行各业的迅猛发展,工业系统中的信息化、数字化
也将成为未来的发展趋势。尤其在狭小的空间操作时,经常要面对功能众多、大
小不等、量程各异的仪表盘,这些仪表盘不仅占用空间,而且不够直观,容易造
成工作人员的误操作或反应滞后,给操作带来不必要的麻烦。因此利用交流电频
率、电压测量的技术,设计出电压频率监测系统,可以简化系统的操作空间,提
高工作效。
本设计以单片机AT89C52为核心,结合外围信号放大、整形电路,通过对输出
波形的计数和对模拟电压的采样、量化得到交流电频率和电压的数字量,将所得
数据通过串行接口发送到上位机进行直观显示,很好的实现了对系统电压频率的
监测。设计结构简单、测量误差小,具有很高的实用价值。
关键词:单片机;频率;电压;采样;AT89C52;AD0809;
兰州理工大学毕业设计说明书
II
Abstract
With digital informatization in the rapid development of all walks of life,
industrial system of informatization, digital will also become the future trend of
development. Especially in the narrow space when operating, often face many
functions, sizes, different range instrument panel. These instrument panel not only
occupy a space, and not enough intuitive, easy to cause the working staff of the
incorrect operation or reaction lag, give operating cause unnecessary trouble. So using
AC frequency and voltage measurement technology, design the voltage frequency
monitoring system, may simplify system operation space, improve work efficiency.
This design taking single chip computer AT89C52 as a core,combining the
periphery signal to enlarge and the shaping circuit, through to the output waveforms
of the count and the simulated voltage sampling, the quantitative get ac frequency and
voltage the digital quantity. These data are sent to the upper computer by a series port
and visual display,realizing the monitoring of the frequency and voltage. Design is
simple in structure, measurement error small, has high practical value.
Keywords:single chip computer;frequency;voltage;sampling;AT89C52;
AD0809;
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