（毕业学术论文设计）-数字信号在电源供电线路上的载波传输电路设计.doc

PAGE l 数字信号在电源供电线路上的载波传输电路设计 摘要 电力线路本身是用来传输电能的，因而在现代社会里它随处可见，是一笔巨大的财富。随着通信技术的不断发展，电力线通信技术日益引起人们的关注。电力线载波通信(PowerLine carrier communition)技术是将电力线作为通信媒介的一种通信方式。该方法可避免新的通信网络建设和投资，因而具有很大的方便性、免维护性和即插即用等特点，因而电力线通信的应用越来越广泛。 电力线用于信息传输的不利因素是线路阻抗小、信号衰减大、时变性大和噪声影响大。故在系统开发中软件设计、器件的选择及电力线接口的设计是关键。本文主要介绍一个电力线载波芯片ST7536和一个可下载程序的STC12C5A60S2单片机构成的FSK低压电力线载波通信系统的硬件电路设计方案。本文着重论证了系统及各个单元电路的实现方案，研究了以ST7536单片机为核心的核心系统设计，包括复位、晶振电路、收发电路及接口电路设计。同时系统的介绍了基于STC12C5A60S2单片机的编程线路的设计包括一个MAX232单片机-PC机接口电路、复位、晶振电路及接口电路。同时利用单片机编程软件keil编写简单控制程序，并实现程序的调试简单步骤、结果及误差分析。 该通信系统利用现有的低压电力网作为信道，使用基于FSK的窄带电力线载波通信方式,实现数据传递和信息交换。具有不用布线、覆盖范围广、连接方便、抗干扰性和抗衰减性、易于实现等显著优势，可以有效可行的实现电力线通信。 关键词：电力线通信，载波通信，FSK调制，STC7536芯片，STC12C5A60S2单片机 DIGITAL SIGNAL IN THE POWER SUPPLY LINE CARRIER TRANSMISSION CIRCUIT ABSTRACT Power line itself is used to transmit electrical energy, which can be seen evetywhere in the modern society is a great asset. With the continuous development of communication technology, power line communications technology is of growing concern.Power Line Communication (PowerLine carrier communition) technology makes the power line as a communication medium of communication. This method can avoid the construction of new communications networks and investment, and thus it has great convenience, maintenance-free and plug and play features, the PLC has been widely applied. Power Line unfavorable factors for the transmission of information is the line impedance, signal attenuation and noise . Therefore, Software design, device selection and power line interface design is the key in the system development.This paper describes the hardware circuit design of a FSK power line carrier communication system which formed by a power line carri