Research On Low-Voltage Power-Line Carrier Communication Module With USB

Power Line Communication is one special way of communication by using power line of industrial frequency as the transmission media. In every home, the power line circuits are more wide spread than TV network or telephone circuits. Meanwhile, the power line communication can be realized on the basis of existed power line network, thus it can save extensive expenditure. So the technology of realizing communication through power line has considerable economic benefit and application prospect. Many companies and institutions at home and abroad have researched on various power line carrier communications in resent years.Spread spectrum communication technique is widely adopted with the advantages of anti-multi-path interference, restricting declination and near-far resistance performance etc. In this paper, the serial-bus USB generally configured in PC is used to communicate with PC because of its convenient, flexibility, low price, plug-pull and high speed.A power line carrier communication module is designed with the technology of spread spectrum communication and USB bus. Firstly, the principle of communication is introduced such as the technology of digital modulation and spread spectrum modulation, and PL2102 modem chip produced by Fu Xing Xiao Cheng Company is used in the design. Then according to the research on the standard and working principle of USB, universal USB interface and its control program are designed through using USB interface chip USBN9604 and low power microprocessor C8051F231, which realizes the communication between general computer and power line communication module with USB bus. Third, the system programmed with VB language communicates with the selected HID driver program through calling Windows API function, which completes the software development. Based on the above work, the performance test of the PLC module is carried on, and the testing results are analyzed.