Desenvolvimento de um transmissor e um receptor PLC

Abstract

This work proposes to develop a PLC transmitter and receiver. The transmitter is based on a FSK modulator accomplished utilizing oscilators and passive band-pass filters. The modulated signal is applied in the power line by a coupling circuit with high-pass filter characteristics. On the other hand, the receiver is coupled to the power line by another high-pass filter which removes the 60 Hz signal and applies the modulated signal in the input of the demodulator circuit. The demodulation is based on the sinusoidal wave convertion to a square wave, which is then processed by the AT89S52. The modulation and demodulation circuits validation is accomplished by experimental results collected from a prototype. The couplers and proposed circuits are tested by a lowering transformer which simulates the power line, as well as it is done the test with a noise generating load.