29-12-2010, 02:07 PM
BY:
Mutasim Ahmed
Mohamed Omer
Mutasim Ahmed
Mohamed Omer
PLC+PIC.docx (Size: 21.69 KB / Downloads: 155)
Introduction
Power line communication (PLC) is a technology that employs the infrastructure of electrical power distributed system as communication medium. PLC technology could provide the consumer with a spectrum of services such as internet, home entertainment, home automation, and enable the electricity supply authority to efficiently mange their distribution networks in a competitive manner.
This technique has immediate attraction for meter communication system, since every consumer is connected to the communication network and that network is owned and controlled by the electricity supply authority. In a meter reading communication system high power signals are transmitted through the network, which are then received by all connected meters.
The proposed PLC transmitter is shown in Figure 1 and consists of the microcontroller which is used as a data source and data synchronizer, an OOK modulator, a power amplifier and an interfacing circuit. A level converter (an operational amplifier which works as a simple comparator) is used to convert data levels between the PIC and the OOK modulator.
In the proposed PLC receiver, the received signal is first amplified using a preamplifier. Then the amplified signal is entered to the OOK demodulator, which recovers the original data. The received data is then passed to the microcontroller which converts serial data into parallel data. An interfacing circuit similar to the interfacing circuit used the transmitter is used to isolate the receiver from the 220 V/50 Hz environment. Figure 2 shows a block diagram of the proposed PLC receiver.