【作者】 梁秀敏；

【导师】 吴伯农；

【作者基本信息】 北方工业大学 ， 机械电子工程， 2009， 硕士

【摘要】 在现代生产的检测和控制中,传感器信号的采集是最普遍最重要的项目之一。在一些测控系统中,计算机主控系统与传感器、测量装置距离较远且测量环境恶劣,传统的数据采集方法是通过无线电传输或采用电缆系统和红外线传输方式。采用无线电传输方式组建测控网占用无线电频率资源;采用电缆成本较高;采用红外线的传输方式,不能穿越墙体,无法实现全部设备的集中测控。而电力网却是相当丰富和独立的,如采用电力线通信技术PLC,实现能源流和信息流共用即可解决采用其他方法存在的问题。本文着重研发基于电力线通信技术这个新应用的传感器信号传输系统。整个系统主要由传感器数据采集单元、单片机主控单元和电力线载波发送、接收单元三部分组成。传感器采集信号经过A/D转换将模拟信号转换为数字信号,对转换后的信号采用BPSK调制技术进行调制,调制后经过载波发送电路把信号耦合到低压电力线网络,经过低压电网传输到指定接收端,再通过解调、信号耦合电路,载波接收电路把信号分离出来。传感器数据采集单元采用16位A/D转换芯片AD7715,AD7715具有片内可编程增益放大器,可以对传感器的小信号先进行放大再进行A/D转换;单片机主控单元采用STC89C516RD+实现对AD7715的控制,同时协调电力线载波的发送和接收;本系统选用RISE3401作为电力线载波芯片,该芯片采用了抗干扰能力较强的二进制相移键控BPSK调制解调技术;在此芯片的基础上设计了电力载波发送、接收等外围电路。根据所设计的硬件电路,编制了相应的软件,并做了软硬件测试。电力载波信号传输测试在一个配电变压器区域范围内进行,测试结果表明:系统在一定距离内对传感器采集信号进行了有效传输。在总结全文工作的基础上,对载波传输系统目前存在的问题进行了分析,并为下一步的研究指明了方向。更多还原

【Abstract】 In the detection and control of the modern production process, sensor signal acquisition is one of the most common and important projects. Some measurement and control systems which measure devices and sensors are far away from computer control system. At present, the methods widely used includes the radio transmission, cable systems and the infrared transmission. But the radio transmision occupies the wireless frequency resource, cable system costs too much and the infrared transmission can’t pass through the walls to realize the centralized control of all the equipments. And the infrark is fairly abundant and dependent. If power line communication (PLC) is used, then energy flow and information flow can be used simultaneously. That is to say, the problems caused by other methods can be solved.This paper mainly discusses a new application in sensor signal transmission system based on the technology of power line carrier communication. The entire system consists of three parts, including sensor data acquisition unit, single chip main control module and the transmitting and receiving unit by power line carrier. Fisrtly, sensor signals are converted from analog signals to digital signals through A/D converter;secondly, the digital signals we just obtained will be modulated by BPSK modulation technology. Thirdly, modulating signals will be coupled to the low-voltage power line network through carrier transmitting circuit;then modulating signals will be transmitted to the designated receiver through the low-voltage network;finally, modulating signals will be separated by demodulation, signal coupling circuit and carrier receiving circuit. 16-bit A/D converter chip AD7715, applied in the sensor data acquisition unit,has programmable gain amplifier on chip to amplfy the small signals in the sensor for transmiting A/D. Single chip main control unit has the capacity of achieving the control of AD7715 with ST89C516RD+, while coordinating the transmitting and receiving of power line carrier. The peripheral circuit is designed based on the chip RISE3401. And the chip, employs Binary Phase Shift Keying BPSK with high speed data transmission. According to the designed hardware circuit, relative software is compiled and the tests about the hardware and software are carried out.Power line carrier signal transmission test is carried out within distribution transformers’ region. The test results show that the system can send and receive the data without error in a certain distance , which can transmitte the sensor acquisition signals effctively. Based on the summary of the full paper, this topic not only analyzes the current problem in carrier transmission systems, but directs the further research.更多还原