Implementation of coupling Circuits for Narrowband Power Line Communications Systems with Its Load Measurement

• Main Authors: Tai-Lin Wu, 吳岱霖
• Other Authors: Der-Feng Tseng
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/26770368671566418676

碩士 === 國立臺灣科技大學 === 電機工程系 === 98 === As the significance of the power line networks is attracting a lot of attention in green energy industry, so are the impacts on other popular wired or wireless communications systems for the electro-magnetic interference (EMI) emitted upon the availability of vast deployment. Currently, narrowband power line communications (PLC) networks, whose frequency ranges from a few hundred hertz to several hundred kilo-hertz, have been considered as alternative for advanced metering infrastructure (AMI). This thesis is partitioned into two major parts; the implementation of coupling circuit and measurement of the load on low-voltage power line. We first devise a coupling circuit suitable for narrowband PLC systems for injection as well as extraction of communications signaling such as its frequency response can meet system’s requirement. Indeed, several factors, including the winding core, are taken into account for the realization. Besides, protection on the coupling circuit subject to different wiring methods on power line is enforced. Impedance matching between transmitter’s and receiver’s couplers is achieved to avoid signal attenuation. Essentially, impedance of transmitter’s and receiver’s couplers plays an important role on the power line channel modeling. In view of this, we conduct the measurement of our realized couplers in terms of active and passive circuits, respectively.Secondly, with the aid of our devised coupling circuit, we can measure the noise from a variety of electrical appliances and subsequently analyze the deterioration on narrowband PLC systems. A framework for noise measurement on individual load is first illustrated, followed by assessment from arbitrary power outlets at certain university’s laboratory, where personal computers are commonly seen and frequently used.