低压电力线载波通信系统设计

低压电力线载波通信系统设计摘要随着现代社会的发展，网络扮演着越来越重要的角色，生产与生活中的大量设备需要连接起来，构成网络，以实现对它们的监测、控制与管理。在这些网络中，需要连接的对象众多，位置可能变动，给网络的构成带来一定的困难。由于这些对象的工作大都离不开电力，所以用低压电力线组成网络进行通信，是一种很有价值的实现方法。本毕业设计主要实现两点之间通过低压电力线载波通信进行数据传输并通过上位PC进行监控。本设计基于SENS-01嵌入式电力线载波模块，其硬件部分包括载波耦合电路、信号发送电路（输出功率控制电路和信号功率放大电路）、滤波接收单元（接收滤波电路和解调电路）、电平转换电路等。软件部分包括串口调试和通信程序。在完成硬件和软件设计之后，测试结果为发送端可以准确、高效的向接收端通过低压电力线发送数据，具有很好的抗干扰性能，可靠性高。关键词：低压电力线；载波通信；电平转换；串口；SENS-01低压电力线载波通信系统设计IAbstractWiththedevelopmentofmodernsociety,networksplayanincreasinglyimportantrole.Intheproductionandlife,alargenumberofdevicesneedtobeconnectedtogethertoformnetworkstomonitor,controlandmanagethem.Itmaybringsomedifficultiesthatthesedevicesmayhavemanylocationsorchangethecomposition.Itisavaluablemethodtouseanetworkoflowvoltagepowerlinecommunication,becausemostofthesedevicescannotworkwithoutelectricity.Themainproblemthisgraduationdesignsupposedtosolveistransmittingdatathroughalow-voltagepowerlinecarriercommunicationsbetweentwopointsandthenmonitoringitthroughthehostPC.ThedesignisbasedonSENS-01,anembeddedpowerlinecarriermodule.Thehardwarepartsofthemoduleincludeacarriercouplingcircuit,asignaltransmissioncircuit(outputpower-controlcircuitandthesignalpoweramplificationcircuit),afilterreceivingunit(receptionfiltercircuitanddemodulationcircuit)andalevelconversioncircuit.TheSoftwarepartsincludeserialdebuggingandcommunicationprogram.Uponcompletionofthehardwareandsoftwaredesign,thesendercansenddataaccuratelyandefficientlytothereceivingendthroughthelow-voltagepowerlines,which,asthetestresult,hasgoodanti-jammingperformanceaswellashighreliability.Keywords:lowvoltagepowerline;carriercommunication;serial;levelconversion;SENS-01目录摘要..........................................................................................................................................Abstract....................................................................................................................................I1绪论....................................................................................................................................31.1研究目的和意义......................................................................................................31.2国内外研究现状与发展趋势..................................................................................31.3本文的主要工作......................................................................................................42低压电力线载波通信系统特性分析................................................................................52.1噪声干扰..................................................................................................................52.2阻抗变化大..............................................................................................................52.3衰减大，且时变性强..............................................................................................63低压电力线载波通信原理................................................................................................83.1电力线载波通信调制技术概述..............................................................................83.1.1窄带通信技术.................................................................................................93.1.2扩频通信技术................................................................................................93.1.3OFDM技术.....................................................................................................93.2通信方式比较..........................................................................................................93.3调制方式选择........................................................................................................113.4载波模块选择........................................................................................................113.5窄带调制原理........................................................................................................123.5.1FSK原理.......................................................................................................123.5.2PSK原理.......................................................................................................134硬件设计..........................................................................................................................154.1系统组成................................................................................................................154.2电力线载波模块....................................................................................................154.2.1过零检测电路..............................................................................................174.2.2调制输出电路..............................................................................................174.2.3检波输入电路..............................................................................................184.3接口转换电路........................................................................................................185软件设计..........................................................................................................................22西南石油大学本科毕业设计（论文