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基于网络技术的中央空调控制系统_电气工程论文
电气工程论文 摘要：网络技术于控制技术的结合日益紧密，而目前几种比较流行的控制技术在其通信范围和控制功能上都存在一定的限制，无法完全达到原先在工业控制中内部通信稳定、高速的性能。本次借鉴目前主流控制技术的经验，设计了基于Internet网络技术的中央空调远程监控系统，借此来探讨网络控制技术的特点、功能及日后改进的方向。本文介绍了以中央空调为对象远程监控系统，不仅可以远程对中央空调实现启、停、模式切换等功能的控制，并可以对采集的数据做各种处理，实现中央空调运行全过程的数字化和可视化，文中概述了该系统的原理结构、功能、应用软件及网络安全等，并引用图片、表格及流程图等加以分析说明。本集成系统目前已处于工程推广阶段，与目前以短距离、非实时为特点的控制技术相比，有较大的应用潜力。 关键词：中央空调；网络技术；实时监控；网络安全 Abstract:The long-range control system is more and more popular based on the network technology. It has many kinds of form with different function. But most of the control systems are unable to totally replace the stability and real-time character of the inside communication of industry control. In order to explore the characteristic, function and future improve; we regard air conditioner as a platform and design the long-range control device based on Internet. The control device set up with real-time character operation characteristic on the basis of steady high-speed network, which is not only has varies control function, and control opening, stopping, such functions as the mode is switched over of PLC, but also can change the data into ocular pictures, make the overall of air conditioner control digitization and visual. Moreover the function of the WWW network is special, which can share information of system WEB and only use standard IE browser technology. And achieve the control shift able and Global. in this article, introduce the Principle structure, Characteristic of controllable strategy, application software and system safety of the system. And explain by pictures, form and flow chart. Key Words: Central Air Conditioner；Network Technology； Incessant Monitor；Online Security
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基于DSPIC的电参数测量仪主电路研发_电气工程论文
电气工程论文 目 录 摘要..Ⅰ Abstract.Ⅱ 1 绪论1 1.1 电参数测量电路的研究背景和意义.1 1.2 国内外的现状...1 1.3 本课题研究的主要内容....3 2 电参数测量仪设计方案比较4 2.1 基于单片机的测量.4 2.2 基于DSP的测量...4 2.3 基于dsPIC的测量.4 2.3.1 dsPIC的产生4 2.3.2 dsPIC型号的选择 5 2.3.3 基于dsPIC的测量.5 3 电参数计算及快速傅立叶变换算法的设计7 3.1 测量信号的提取 7 3.2 电参数计算.7 3.3 快速傅立叶变换 9 4 硬件设计16 4.1测量仪电路特点 16 4.2 系统总体方案.16 4.3电源的设计16 4.3.1 5V工作电压16 4.3.2 电参数采集电路17 4.3.2.1 电压互感器17 4.3.2.2 电流互感器18 4.4 dsPIC30F6012外部数据存储器和程序存储器的扩展19 4.4.1 AT24C16的基本情况20 4.4.2 读/写时序及I/O口实现20 4.5 dsPIC30F6012与时钟芯片接口电路21 4.6 dsPIC30F6012与液晶模块接线电路22 4.7 dsPIC30F6012的串口通讯电路.23 4.7.1 RS232串口通讯..23 4.7.2 RS485串口通讯24 5 软件设计26 5.1系统的程序框图...26 5.2 数据采集程序 27 5.3 时钟程序 28 5.4 液晶显示程序.30 6 总结 32 致谢 33 参考文献 34 附录1 附录2 摘要 随着科技进步，仪器设备的使用越来越多，保证设备的安全正常运行很重要。电网质量的好坏对设备的影响较大，对电网中的各个参数进行测量，便于实时检测，保护设备。对于电参数测量电路的研究很有必要。 本设计用电压和电流互感器构建信号转换电路。以Microchip公司的dsPIC30F6012为主控芯片，对采集的电压电流参数进行转换处理，测取电压、电流、有功功率、谐波等，通过液晶显示进行实时监控，并通过RS232或RS485通讯接口与上位机进行通信。本系统采用软硬件结合的方式，简化了硬件电路，提高系统的可靠性，增加稳定性。软件编译采用模块化。本系统集测量、控制、显示等功能于一体，能很好的应用于实际生产中。 关键词： 电参数测量 dsPIC FFT 液晶显示 通信 Abstract With the scientific and technological progress, the equipment is used more and more, ensured normal and safe operation of the equipment is important. Quality of electrical network will have a greater impact to equipment. Measured each parameter by electrical network, convenient for real-time monitoring and protection equipment. Researched the electrical parameters of measurement circuit is necessary. The project uses voltage and current mutual inductors to construct signal transition circuit. dsPIC30F6012 which produced by Microchip Company is the main-control chip. Calculated the voltage, current, active power, harmonics, and so on by voltage and current parameters of the collection and processing conversion. Parameters used LCD display. System is communicated with the PC by RS232 or RS485 communication interface. It adopts unite hardware and software. It makes hardware circuit easier, enhances reliability of system and increases stability. Software designing adopts modular. The system which includes measuring, controlling, displaying and other function has the characteristics of multi-function, it must good used in the production. Keywords: Electrical Parameters’ Measuring, dsPIC, FFT, LCD, Communication
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自主移动机器人控制器设计_电气工程论文范文
电气工程论文 摘要：以八位单片机为核心的嵌入式系统早已广泛应用于各个领域，这些应用大多还处于单机使用的嵌入式底层阶段。其特点是以MCU为核心，与一些简单的传感器及监测、指示、和显示等设备配合，实现一定的测量、显示、信息处理及控制等功能。虽然在许多应用中利用了CAN、RS-232和RS-485等总线将MCU组网。但这种网络的应用空间有限，相关的通信协议也比较单一，并且没有和广泛应用的Internet连接。目前，Internet已成为社会重要的基础信息设施，是信息流通的重要渠道。嵌入式系统必将与Internet完美融合，方便、低廉的将信息传送到世界上的任何一个地方。 ARM体系的处理器是目前嵌入式系统中使用最广泛的处理器。它采用了RISC技术，具有体积小、低功耗、低成本、高性能等特点，芯片内部大量使用寄存器，指令执行速度更快，指令长度固定等特点，使得它的处理速度快，执行效率高。由于Linux对于ARM技术的支持，具有内核可裁减，代码开放的特点，把Linux应用到嵌入式系统中，能充分发挥ARM和Linux的优势。 本文首先说明了所构建的基于ARM的自主移动的嵌入式系统的总体结构，然后进行了系统的硬件设计，接着针对系统的硬件设备移植了启动代码，最后说明了uCLinux内核配备和移植相应的的方法和说明，最终开发设计出一个基于ARM的自主移动机器人的嵌入式系统核心。本文最后进行了总结与展望。 关键词: 嵌入式系统； ARM； 板级设计；设备驱动程序 Abstract:Embedded system with eight bit microcomputer as the core is applied in various fields. These applications mainly stay in embed bottom floor stage of microcomputer. Its characteristics are taking MCU as core, with simple sensors and monitoring, prescription, and display device etc to realize certain functions such as measuring, displaying, information processing and controlling. Though CAN, RS-232 and RS-485 buses are applied to make up MCU network, this application space is very limited, relative protocols are somewhat simple, and there is no connection to broadly used Internet. Currently, Internet becomes important information infrastructure and main access of information communication. Embedded system must perfectly combined with Internet so as to transfer information to everywhere in the world. Processor in ARM system is mostly used in current embedded system. It takes RISC technology, with characteristics such as small volume, low power consumption, advanced function. Registers are greatly used in inner chip, instruction executes fast and with fixed length, which enables processor works fast with high effectiveness. As Linux supports ARM technology, has inner core can be downsizing and open codes, so applying Linux to embedded system can give fully play to ARM and Linux advantages. General structure of automatically mobile embedded system based on ARM is explained in this paper, then system hardware design, replanting starting code to system hardware device, finally uCLinux inner core configuration and the method &instruction of replanting. Embedded system core in automatically mobile robotics based on ARM is designed and developed eventually, which is concluded and prospected at the end of the paper. Key words: Embedded system； ARM；The board-grade design；Driver
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基于神经网络的变压器故障诊断研究
目 录 摘 要I 1 绪论1 1.1引言1 1.2国内外研究现状及发展趋势1 1.3基于神经网络的变压器故障诊断研究的意义3 1.3.1神经网络的应用领域3 1.3.2神经网络的发展趋势3 1.3.3基于神经网络的变压器故障诊断模型的优越性4 1.4本文的主要研究内容4 2 变压器故障及其诊断方法6 2.1变压器油中气体产生机理6 2.1.1油中溶解气体的来源6 2.1.2特征气体产生的原因和特点7 2.2变压器故障类型8 2.3充油变压器的故障诊断方法10 3 神经网络模型及BP网络学习算法分析13 3.1神经网络模型13 3.1.1人工神经网络理论13 3.1.2人工神经元模型13 3.1.3人工神经网络类型14 3.2 BP网络模型及其学习算法15 4 BP网络的设计与应用17 4.1利用神经网络进行故障诊断的可行性17 4.2 BP神经网络的创建18 4.3训练样本的采集与预处理19 4.4 BP神经网络编程仿真及在故障诊断的应用24 5 结论28 致 谢29 参考文献30 摘 要 电力变压器是变电站的关键设备，其运行的安全、可靠性直接关系到电力系统的安全与稳定，因此，有效地监测变压器运行状态、诊断和预报变压器故障具有实际意义。 本文在广泛查阅相关文献的基础上，系统综述了电力变压器故障过程特征气体产生的物、化机理，以及不同种类故障与不同种类特征气体含量之间的相应关系。 在分析了油中溶解气体含量与不同故障之间联系的基础上，利用气相色谱技术采集油中特征气体含量数据样本作为人工神经网络学习训练的特征向量矩阵，充分利用人工神经网络具有的并行处理、学习和记忆、非线性映射、自适应能力和鲁棒性等特点，构造了基于人工神经网络的电力变压器故障特征气体诊断系统，选择和训练了BP神经网络。 通过对样本的训练和对故障诊断样本的诊断，故障诊断正确率达90%以上，满足实际要求，说明本文建立的结构为5-12-5型的电力变压器故障诊断BP神经网络模型是合适的、可行的、正确的，能够很好的应用于电力变压器的故障诊断。 关键词：电力变压器 神经网络 故障诊断 收敛速度 Abstract Power transformer is the key apparatus at the transformer substation, its working safe and reliability relate to the safety and stabilization of power system directly. Therefore, it has practical significance to effective inspect the running condition of transformer, diagnose and predict the transformer fault. This paper is based on a lot of references, system overview the fault processing of the power transformer, the principle of gerneration characteristic gas, corresponding relationship between the different kinds of fault and different kinds of characteristic. Base on analysis the relationship between the dissolving gas content in oil and different kinds of faults, making use of the technology of gas phase color spectrum sample data of the characteristic gas content in oil. Then these data samples become to the learning and training characteristic vecter matrix of the artifial neural network .Making the most of the paralleling processing, learing,memorization,nonlinearity mapping,adaptation ability and robustness etc of the artifial neural network,constructing the fault characteristic gas diagnosis system of the power transformer based on the artifial neural network. Selecting and training the BP neural network . According to the transformer fault gases and the fault types, a type of 5-12-5 BP Neural Network model for transformer fault diagnosis is established. After training and fault diagnosing, the model's fault diagnosis accuracy is above 90%,which shows that the model is proper, feasible and correct for the transformer fault diagnosis. Key words: Power Transformer; Artificial Neural Network; Fault Diagnosis; Network Convergence Speed
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全自动异地数据库备份和恢复系统_电气工程论文范文
电气工程论文 摘要：随着数据库技术的不断发展，数据库的规模越来越大，其功能也越来越强大。互联网技术的飞速发展，使企业的信息数据量也急剧增长。因此提高数据的安全性和数据恢复能力一直是关注的焦点。实现一套安全的，方便的，自动的，经济的备份恢复系统非常有实际价值。 数据库系统作为信息系统中的基础软件，其安全性问题十分重要。目前国内的数据库系统基本采用国外产品，必须确保对其进行安全利用和有效监控。本文在对数据库系统安全相关理论和技术进行探讨的基础上，基于安全性增强的思想，对SQL Server 2000数据库的应用系统的安全增强进行了研究和探讨。 本论文主要研究了目前信息安全的研究与发展以及数据库安全的现状；多角度地分析了数据库系统的安全性威胁和数据库安全性的基本要求。以SQL Server数据库为实例，对SQL Server数据库基于角色的权限管理，访问控制，审计监控、增量备份和数据恢复等关键性技术进行了深入研究。 主要基于SQL Server数据库系统，对数据库存储及传输加密、用户口令认证，安全审计机制等给出了技术实现，并通过存储过程、函数和程序包的方法对现有的数据库系统安全功能加以改进。在Visual C++和SQL Server 2000数据库的开发环境下，实现数据库的异地自动备份和恢复功能。 关键词：数据库、 VC、 安全性、备份、 恢复 Abstract:Along with the database technology development，the scale of Database become larger and larger. Their functions are increasingly powerful. Internet technology is developing at full speed，Enterprise information and data was also rapid growth. Therefore improve data security and data recovery capability has been the focus of attention. Achieving a safe, convenient, automatic, economic system of backup and recovery demonstrates very practical value. As foundation software of information system, it is significant for its security. Now most database systems use foreign product in our country. It should be solved how to ensure secure use and audit effectively. Based on a plenty of papers, technology reports and dissertations, this dissertations make some research work on the field of secure theory and technology and study on secure enhancement based on SQL Server database system. The dissertation mainly studies in the current information security and the database security status. The characteristics and fundamental requirement of database security issues are proposed. For SQL Server database, the aspects of privilege admin based on roles, the granularity access control, audit and backup and restore technology are discussed. Based on SQL Server database, database storage and transmit authentication, users password authentication, secure audit are realized. Database security functions improve by procedure, function and program packages. In Visual C + + and SQL server 2000 database development environment, accomplish database automatic backup and recovery functions. Keywords: Database、VC、Security、Copy、Restoration
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某110kV变电站一次系统设计
目 录 摘 要III AbstractIV 1 前言1 1.1 110kV变电站的现状与发展趋势1 1.2 本文所做的主要工作1 1.3 设计中使用的国家与行业标准及规范2 2 某110kV变电站原始资料及负荷计算3 2.1 110kV变电站原始资料3 2.2 110kV变电站负荷计算与分析4 2.3 110kV变电站无功补偿7 3 某110kV变电站主变压器选择9 3.1 变压器选择原则9 3.2 主变台数与容量计算9 3.2.1 台数选择9 3.2.2 容量选择10 3.3 变电站用变压器选择11 3.4 110kV变电站变压器的功率损耗计算11 4 某110kV变电站一次接线设计13 4.1 110kV变电站主接线设计规范13 4.2 110kV变电站电气主接线的设计14 5 某110kV变电站短路计算18 5.1 短路计算的目的步骤18 5.2 短路计算过程18 5.2.1 计算短路电路中各主要元件的电抗标幺值19 5.2.2 计算各点短路总阻抗标幺值及三相短路电流和短路容量20 6 某110kV变电站母线及进出线选择24 6.1 变电站高压母线选择24 6.2 110kV变电站出线选择25 7 某110kV变电站电气设备选择及校验28 7.1 变电站电气设备选择的要求28 7.2 变电站110kV开关设备选择与校验28 7.3 变电站35kV开关设备选择与校验31 7.4 变电站10kV开关设备选择与校验34 7.5 110kV配电装置设计38 8 某110kV变电站防雷系统设计39 8.1 接地装置设计要求39 8.1.1 变电站的接地装置设计39 8.2 防雷保护40 8.2.1 变电站的主要防雷对象40 8.2.2 直击雷主要保护措施41 8.2.3 本站避雷针的确定41 结 论43 致 谢44 参考文献45 附录1 110kV变电站主接线图 附录2 35kV侧出线线路图 附录3 10kV侧出线线路图 摘 要 电力系统是国民经济的重要能源部门，而变电所的设计是电力工业建设中必不可少的一个项目。按照国家相关设计标准和规范，设计一座110kV变电站，设计电压等级为110/35/10kV。根据设计的要求对变电站进行负荷计算，从而确定变电站变压器的数量、容量及型号，同时确定变电站的主接线方式；根据最大持续工作电流及短路计算的计算结果，选择高压断路器，隔离开关，母线，电压互感器，电流互感器以及其他设备和仪器，并且进行设备的校验。然后是继电保护装置的选择以及防雷接地的设计。运用Auto CAD及Visio等软件绘制变电站的电气图纸。变电站的设计将为周边的经济发展提供一个强大的能源支持，促进国民经济的发展。 关键词：变电站设计，一次系统，110kV变电站， 供电设计 Abstract The electrical power system is a very important energy department in the national economy, and the substation’s design is an essential project in the electric power industry’s construction. According to national design standards and norms ,a 110kV transformer substation was designed ,the Voltage rating was 110/35/10kV.On the basis of the design requirements to calculate the load of the substation，and then to ascertain the number, capacity and model of the main transformer, furthermore ,to ascertain transformer substation’s main wiring. In accordance with the result of maximum continuous operating current and the calculation of short-circuit current to choose high voltage circuit breaker, isolating switch, busbar ,voltage transformer ,current transformer as well as other equipment and the instrument And then to check those equipments whether conform the requirements .After that system of relay protection should be chosen , and lightning protection should be designed .In the end, the electrical papers should be drawn by Auto CAD and Visio. A strong energy requirements of economic development would be supplied by the transformer substation’s design ,and promote the development of national economy. Keywords：substation design、a system design、110kV substation、power supply design
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自动抄表系统设计_电气工程论文范文_电气工程论文
电气工程论文 目录 第1章 绪论1 1.1课题的研究目的与意义1 1.2国内外研究现状和动态2 1.3本文的主要内容4 1.4课题的可行性分析5 第2章 自动抄表系统的总体设计6 2.1自动抄表系统的组成6 2.2电能表7 2.3 数据采集集中系统7 2.4 数据管理中心8 第3章 抄表系统电能表介绍9 3.1电子式电能表的基本原理9 3.2电源电路11 3.3 A／D转换模块13 3.4主控制器PIC16F87317 第4章 数据采集集中系统20 4.1总述20 4.2 RS485通信单元21 4.3电力线载波通信单元25 4.4 GPRS无线通信单元32 第五章 数据管理中心36 第六章 总结39 参考文献41 致谢42 附录 总电路图45 摘要 在社会主义新农村的前提下，当前农网存在诸多弊端，如人工抄表费时费力、抄表的准确性无法保证等。 本文详细介绍了农网远程自动抄表系统设计。其中简要介绍了抄表系统所采用的电能表，重点介绍了抄表系统中的各层之间的通信方式。该自动抄表系统主要包括系统中采用的电能表部分，数据传输中用到的RS485通信、低压电力线载波通信和GPRS无线通信等通信技术，最后简单叙述了数据管理中心。该抄表系统能很好的解决人工抄表的问题，省时省力，抄表准确，具有重要的意义。 关键词：农网自动抄表设计；低压电力线载波通信；GPRS无线通信 ABSTRACT In the premise of new socialist countryside, there are many drawbacks of the current Rural, such as artificial Meter reading time-consuming and laborious, the accuracy of meter reading and so on. This paper describes the remote automatic meter reading system of rural power grid technology, which outlined the use of meter-reading system of the power meter, the meter reading system focuses on the means of communication between all levels. The automatic meter reading system including the system used in power meter, and the RS485 communications, low-voltage power line carrier communications, and GPRS wireless communications used in Data transmission. Finally, describe the data management center briefly. The meter reading system do well in solving the problem of manual meter reading, save time and manpower, accurate meter reading, and have great significance. Keywords: Design of automatic meter reading rural network; low-voltage power line carrier communication; GPRS wireless communication
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某花园式住宅建筑电气系统设计
目 录 摘要Ⅱ AbstractⅢ 1 引言1 2 配电系统设计2 2.1 配电系统设计概述2 2.2 住宅配电设计要求2 2.3 负荷分级2 2.4 配电线路保护3 2.5 供配电负荷计算4 2.5.1 进户配电箱总功率计算4 2.5.2 保护电流计算5 2.5.3 断路器选型6 2.6 配电回路机器保护措施方案选择7 3 照明系统设计9 3.1 照明系统计算方法9 3.2 功率计算及灯具选型11 4 插座设计15 4.1 插座位置及数量设计15 4.2 导线及导缆选择16 5 弱电系统设计17 5.1 弱电系统概述17 5.2 有线电视系统17 5.2.1 有线电视系统的组成和分类18 5.2.2 有线电视系统设计19 5.3 对讲系统19 5.3.1 对讲系统概述19 5.3.2 对讲系统结构和功能设计20 5.4 电话系统20 5.4.1 电话系统概述20 5.4.2 电话系统设计21 6 总结22 致谢23 参考文献24 附录 附录图1-13 摘 要 花园住宅的电气设计是住宅设计的一个重要组成部分，它对于展现住宅建筑的美观、实现住宅建筑的使用功能、保障居住者的生命财产安全、降低住宅造价，均具有一定的影响。 本论文按照电气规范手册的规定，对三层花园式建筑电气系统进行设计。全文主要通过以下四部分阐述: 有配电系统设计，照明系统设计，插座系统设计，弱电系统设计。首先，配电系统设计，包括进户配电箱功率的计算、断路器及电力线缆的计算与选型、配电系统图的绘制；其次，照明系统设计，包括照度的计算以得出不同的房间所需灯具的功率，选择灯具型号与数量，绘制灯具与开关的布线图；再者，插座系统设计，包括计算不同的房间所用电器的功率，得出不同插座的功率，计算插座的数量，绘制插座布线图；最后进行弱电系统设计，即电视、电话和对讲系统设计。 关键词： 配电、照明、插座、弱电 Abstract The electrical system design of garden residence is an important part of the residential design. It has a great influence on showing the beauty of the residential buildings, realizing the function of residential buildings, ensuring the safety of the residents and their property and reducing the cost of construction. Based on the rules of Electrical Specification Manual, this paper designs the electrical system of three layered garden-style building. It consists of four main parts: distribution system design, the lighting system design, the socket system design and the weak current system design. First, the distribution system design includes the calculation of enter door distribution box, the calculation and selection of circuit breakers and power cables and the drawing of the whole system; Second, the lighting system design includes the calculation of the illumination to get the power of lamps and lanterns in different rooms, selection of the model and the number of the lamps and the drawing of lamps and switches; Third, the socket system design includes the calculation of the power of sockets through the data of appliances in different rooms, selection of the number of sockets and the drawing of the sockets; Finally, the weak current system design is equal to the design of TV, telephone and talkback system. Keywords：Distribution system，Lighting，Socket ，Week current
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数控钻孔机控制系统设计_电气工程论文范文
电气工程论文 摘 要：数控钻孔机控制系统是用在孔加工机床上，以可编程序控制器为主控制器，控制钻头相对于工件的定位，由一个定位点向另一个定位点的控制系统。该系统由可编程序控制器、步进电机驱动器、步进电机、触摸屏等构成。PLC是专为工业环境设计的一种工业控制计算机，具有抗干扰能力强、可靠性极强、体积小、编程方便等特点。利用可编程序控制器脉冲输出指令控制步进电机的转速、方向和移动距离，从而实现精确定位。触摸屏可用来显示机器当前运行状态，保存配方数据，还可以设置运行参数。所设计的数控钻孔机控制系统的具有自动控制、手动控制、运行监控、参数设置等功能。 关键词：数控钻孔；可编程序控制器；步进电机；触摸屏；定位控制 Abstract：The control system of NC drilling machine which takes the PLC as the main controller is used in drilling machine. It controls the aiguille moving from one positioning to another positioning relative to the positioning of the workpiece. The system consists of PLC, stepper motor driver, stepper motor, HMI, and so on. PLC that designed for the industrial environment specifically is an industrial control computer. It has many advantages, for example, anti-interference capability, high reliability, small size and easy programming and so on. PLC used Pulse Output Function to control the stepper motor speed, direction and distance of movement, accordingly realizing the purpose of exact orientation. HMI can be used to indicate the system’s operating state, to preserv the Filing data, but also can be to set operating parameters. NC drilling machine control system which is designed has automatic control procedures, manual control, operational control, parameter setting, and other functions. Keywords：NC Drilling；PLC；Stepper Motor；HMI；Position Control
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简易数字频率计
目 录 摘 要I AbstractII 目 录III 1 前言1 2 8051单片机简介4 2.1 8051单片机的结构4 2.2 8051单片机与LED显示方法6 3 MAX+PLUS II简介7 3.1 Max+plusⅡ功能简介7 4 简易数字频率计的实现方式10 4.1 测频方案及其原理与误差分析10 4.2 等精度测频系统组成12 4.3 信号调理电路设计13 4.4 等精度测频电路的软硬件设计16 4.4.1 硬件设计16 4.4.2 软件设计19 4.5 数字频率计设计源程序20 5 结论23 致谢24 参考文献25 附录26 摘 要 本设计运用VHDL语言，采用Top To Down的方法，设计了一种8位简易的数字频率计，并利用Isp Expert集成开发环境进行编辑、综合、波形仿真，并下载到CPLD器件中，经实际电路测试，该系统系统性能可靠。主要功能有：频率测量、周期测量和脉冲宽度测量。整个设计可以分为三个部分：方案设计、软件设计、硬件设计。本文详细介绍了简易数字频率计的软件设计和硬件设计。 关键词：EDA；VHDL；数字频率计；波形仿真；CPLD Abstract The use of VHDL design language, the use of Top To Down approach, designed a simple 8-bit digital frequency meter, and the use of Isp Expert integrated development environment for editing, synthesis, simulation waveforms, and downloaded to the CPLD devices, the actual circuit test, the system reliable system performance. The main features are: the frequency of measurements, the cycle measurement and pulse width measurement. The whole design can be divided into three parts: program design, software design, hardware design. This paper describes a simple digital frequency of software design and hardware design. Key word: EDA；VHDL；digital frequency meter；Waveform Simulation；CPLD
