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1、东华理工大学长江学院毕业设计(论文) 摘要I摘 要数字电表系统是一种结构简单、功能全面、抗干扰能力强的新型智能电表系统。它可以对用户的用电量进行准确计量,可以预存电费、实时查阅用户的用电情况并及时给予欠费提示,还可以用软件控制方式对用电器进行识别与控制,并能同时对多个用户的用电信息进行管理。多费率电能表应具有的基本功能,多费率电能表的工作原理、硬件原理框图和控制程序流程图。采用基于单片机为主控芯片的硬件平台，实现了实时时钟、数据存储、数据通信、电量采集、液晶显示、超低功耗等功能，使电表可以循环显示各个时段的电量。本课题介绍一种基于PIC 单片机的多费率电能表主电路及通信接口电路,阐述了电能表电
2、路的工作原理。电量的测量采用AD7755 专用芯片,可保证测量脉冲数的准确性;硬件日历时钟及参数存储采用串行I 2C 总线器件,减少了电路连线,提高了电能表工作可靠性。本课题设计的多费率电度表，主要用它不仅能进行电能计量、还具有费率管理、通讯等功能，同时具有计量精度高、电磁兼容性能好、过载能力强，功耗低等特点，安装时无需校表即可使用。而且稳定性很好，寿命长，测量精度基本不受温度影响。在预先设置好的各个时段内对电量进行累加和计费。电表可以循环显示各个时段的电量。这种电能表，是一个具备数据采集、数据处理和显示功能的单片机应用系统。为了减少电表自身的能量消耗，电表内芯片全采用CMOS器件，且在没有负
3、荷时置单片机于SLEEP工作方式。关键词：多费率；电能表；PIC单片机；I 2C总线东华理工大学长江学院毕业设计(论文) 摘要II东华理工大学长江学院毕业设计（论文） ABSTRACTIIIABSTRACTThe digital electric instrument system is one kind of structure is simple, the function is comprehensive, antijamming ability strong new intelligence electric instrument system. It may carry on the
4、 accurate measurement to users electricity consumption, may save the electrical bill, the real-time consult user to use electricity in advance the situation and gives the money owed prompt promptly, but may also use the software control way to use the electric appliance to carry on the recognition a
5、nd the control, and can simultaneously use electricity to many users the information to carry on the management。Many of the electric rate should have basic function, the electric rate of work principle, the hardware principle diagram and control program flowchart. Based on singlechip control chip ha
6、rdware platform, realize the real-time clock, data storage, data communication, electricity, liquid crystal display, collection, low power consumption, etc. Function that can be recycled meter during each power. This subject introduces a method based on the rate of the PIC microcontroller more elect
7、ric circuit and the communication interface circuit, this paper expounds the working principle of electric circuit. The power is measured by AD7755 special-purpose chip, can guarantee the accuracy of measuring pulse count, Clock and parameters storage hardware calendar by serial I2C bus, reducing th
8、e circuit connection device, improving the working reliability of electric.This topic design, use more meter rate it can not only for energy metering, also has the function of management and communication rate, and has high measuring accuracy, emc performance is good, overload ability, low power con
9、sumption, installation without school table can be used. And good stability, long life, not the temperature measurement precision basic. In advance of each time is set to accumulate and pricing power. Meter can display during each cycle of electric power. The meter is a have data acquisition, data p
10、rocessing and display of microcomputer application system. In order to reduce its energy consumption, electric meter using CMOS chip all within the meter, and no load device for SLEEP when the SCM in work style.Keywords： rate；meter； the PIC microcontroller； I2C bus东华理工大学长江学院毕业设计（论文） 目录IV目 录绪论 .11.1
11、本课题的意义 .11.2 系统设计要求 .11.3 系统设计方案 .22 硬件设计 .42.1 系统总体框图 .42.2 PIC16C67 单片机 .52.3 电能计量芯片 ADE7755 .72.3.1 ADE7755 的内部结构和工作原理 .82.3.2 ADE7755 的应用 .102.4 数据存储芯片 AT24C04 .122.5 掉电检测芯片 IMP813L .132.6 RS485 串行通讯接口 .152.7 实时时钟芯片 PCF8563T .173 模块设计 .193.1 系统软件的总体流程 .193.2 I2C 总线模块 .203.2.1 I2C 总线时序 .203.2.2 I2C 总线通讯流程 .213.3 电量累计模块 .223.4 掉电检测模块 .243.5 显示模块 .243.6 电源模块 .263.7 通讯模块 .273.8 通讯中数据帧的传输格式 .30设计展望 .33致 谢 .34参考文献 .35附录 .36东华理工大学长江学院毕业设计(论文)
