多费率电表设计 数字电表设计 毕业设计 优秀毕业论文.docVIP

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，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I2C 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；　I2C总线 ABSTRACT The 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 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 and 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 hardware 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 electric 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 the circui