低压电力线信道阻抗测量与匹配  

Impedance Measurement and Match on Low-voltage Power Line Channel

作　　者：李家生[1] 刘大茂[1] 孙旭飞[1] 

机构地区：[1]福州大学,福建福州350108

出　　处：《现代电子技术》2011年第7期161-163,166,共4页Modern Electronics Technique

摘　　要：为了测量电力线的阻抗,设计一个电力线载波通信信号发射系统,分析了电力线信道的阻抗特性,根据LC谐振原理,设计低压电力线阻抗测量方案并制作了实际电路在学校各个地方进行实际测量。根据实际测量结果,得出电力线电抗呈感性,包含电阻和感抗两部分,并且阻抗变化的主要因素是感抗的变化。对于实验室、宿舍、办公室这类用电器较多的环境,电力线的电感值较小;而对于教室、走廊、活动室这类用电器较少的环境,电力线的电感值较大。这一结论对电压电力线的阻抗匹配是非常有用的,最后提出一种简单实用的匹配电路设计。In order to measure the impedance of the power line channel, a signal transmission system for power line carrier communication is designed and the impedance characteristics of the power line channel is analyzed. A scheme to measure the impedance of the low-voltage power line channel is designed according to the principle of LC resonant circuit. The power line channel impedance were detected at various places in the school. The detected data indicates that the impedance of the lowvoltage power line channel is inductive and is composed of resistance and inductance. The main factor of the impedance variation is the change of the inductance. The places （such as laboratories, ddrmitories and offices） which have more electrical devices have lower inductance. The places （such as classrooms, corridors and activity rooms） which have less electrical devices have higher inductance. This conclusion is very useful for the impedance matching. A simple and practical impedance matching circuit is offered.

关 键 词：低压电力线载波通信 阻抗测量 耦合器 阻抗匹配 

分 类 号：TN913-34[电子电信—通信与信息系统]