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024电力载波通信电路研究  论文
双击自动滚屏 文章来源:   发布者:jsjlw99   发布时间:2009/7/8 17:19:02   阅读:735
中文摘要
电力线通信是继电信,电话,无线通讯,卫星通讯之后的又一通信网。电力线载波通信就是以电力网作为信道,实现数据传递和信息交换。因为电源线路是每个家庭最为普通也是覆盖最为宽广的一种物理媒介,所以利用电力线实现数据通信有着很大的经济效益和应用前景。
由于低压范围内电力线网络的非规则性,传输距离的随意性,以及电力线上负载变化的多样性,使得干扰问题成为制约低压电力线载波通信发展和普及的主要障碍。本课题在对低压电力线的传输特性和接收调制技术进行分析的基础上,将对电力载波通信的接收和发送电路进行设计研究,主要研究内容如下:
(1)对低压电力线的传输特性进行分析,在低压电力线上进行信号的传输,突出表现在工作环境恶劣,线路阻抗小,信号衰减强,干扰与时变性大等特点,因此,对于低压电力线载波信道特性,本文将做必要进一步具体分析:
(2)利用仿真软件EWB,对自行设计的自动增益控制放大电路(AGC)进行模拟仿真,验证其实验结果。其目的是要完成小信号的放大,同时保证输入信号幅值过大时,放大器不会饱和失真,此级具有自动增益控制能力。
(3)设计耦合电路,载波调频信号从电力线上可以通过耦合电路进入到解调电路,耦合电路是一个带通滤波电路,是实现将信号频带外的其他频率滤除的功能电路。耦合电路设计的基本要求包括:将强电与弱电隔离;通过有用的载波调频信号;滤除带外干扰和噪声;能够双向传输,即能收能发。
(4)设计发送驱动电路,并利用EWB仿真软件对其进行仿真验证。调相信号经该级驱动后,经电容耦合,直接送入耦合电路。
 
关键词:传输特性,接收调制技术,自动增益控制,耦合电路,发送驱动电路
 

ELECTRICITY CARRIER COMMUNICATION
CIRCUIT
     
Abstract
Telecommunication, telephone, wireless conminucatian, satellite communication after another communication network. Electricity network is a power line carrier communication network as access to data transmission and information exchange. Because every family is the most ordinary power lines also is the most broad coverage of a physical media, the use of power lines for data communications have great economic benefits and application prospects.
The low voltage power-line network within the rules of non-sexual, transmission distance arbitrariness, and power line load change diversity makes low voltage power line interference issues have become carriers of the main obstacles to development and diffusion of communications. The topic of low-voltage electricity transmission line characteristics and receiving technical analysis prepared on the basis of electricity carrier will receive and send communications circuit design research, the main research reads as follows :
(1)  Characteristics of low-voltage electricity transmission line analysis, in low voltage electricity transmission line to signal that can be highlighted in the working conditions, small circuit impedance, signal attenuation strong, interference with the characteristics of degenerative large. For low-voltage power lines carrier access, which will be necessary to do further specific analysis.
(2)  Use simulation software EWB, designed AGC enlarged circuits (AGC) simulation, the certification of its experimental results. The aim is to complete the small signals enlarged, while guaranteeing signal worth importing excessive, the amplifier will not saturation distortion, this class should have AGC.
(3)  Design coupled circuits, carrier FM signals from the power line can be coupled circuits entered demodulate circuit, coupled with a recovery circuit is a circuit that will be achieved outside the signal band frequency filter out other functional circuits. Coupling circuit design of the basic requirements include : strong will power and weak electricity segregation; FM signals; through useful carrier outside interference and to filter out noise; To two-way transmission, which can be made collect.
(4)  Sent driven circuit design, and use their simulation EWB simulation software certification. PM signals, viacapacitance coupling, coupled directly into the circuit.
Key words:  Transmission,Receive,Agc,Drive Circuit,Coupled Circuit 
目录
第一章 绪论··· 1
3.1.1 低压电力线上输入阻抗的变化特性 · 6
第四章EWB简介··· 12
第五章AGC电路的设计与仿真··· 14
第六章 耦合电路的设计与仿真··· 21
第七章 发送驱动电路的设计与仿真··· 25
结论··· 31
谢辞··· 32
附录··· 34
 
 
 
 
 
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