Design And Implementation, Based On Pl3105 Power Carrier Terminal

In this paper, a kind of power line carrier terminal used in project of guarding power-line against theft was designed and discussed. In this power line carrier terminal, low-voltage power line carrier communication technique was adopted to monitor the power line state, GPRS was introduced to give an alarm to the center of supervisal far away, and SMS was used to alarm designated cell phone.At first, after discussing the transmission channel property of the low voltage power lines, the respective characteristic of narrowband, spread spectrum communication and orthogonal frequency division multiplexing technique were discussed and compared. According to the demand of this project, a kind of homemade chip PL3105 based on direct sequence spread spectrum technique was selected. Secondly, the cucuit of power line carrier terminal based on chip PL3105 was designed and debugged, and the alarm cucuit on module G20 was designed and degugged too. Thirdly, the extended application of the power line carrier terminal was dicussed. At last, the software of MCU which is included in PL3105 was designed and debugged to reaize the monitor function and alarm function of the power line carrier terminal.