Acoplador capacitivo para a recepção de sinais PLC na faixa de frequência entre ≈ 0 e 2 MHz

Abstract

The present work discusses the problem of coupling data communication devices that transmit information through the low voltage electrical power grids when the frequency range is close to that of the fundamental frequency, that is, f0 = 60 Hz, are used. In this sense, the present work introduces the capacitive coupler, which presents an almost ûat attenuation function in the frequency range between ≈ 0 and 2 MHz, except in a narrow frequency range, around the fundamental frequency, in which the attenuation obtained through computer simulations is about 57 dB. Furthermore, the present work presents the prototype of the capacitive coupler and discusses the results obtained in practical experimental tests. The experimental tests show that the development capacitive coupler connection presents an attenuation of 22 dB in the funda- mental frequency, which conûgures a reduction of ≈ 35 dB to the attenuation obtained with the computational simulation. Despite the signiûcant reduction of the attenuation observed in the proposed capacitive coupler, a suûcient reduction in the amplitude of the fundamental compo- nent is observed to digitize the received signal PLC and, consequently, digital processing of the received signal PLC for complete elimination of the residual of the fundamental component.