Abstract
In this paper, a method to design coupling and filtering device for low-voltage power line communication system is presented. The data transfer mode of power line communication and the signal’s working attenuation of low-voltage power line are analyzed. As for low-voltage power line, the input impendance is stable in the frequency band over 1MHz. So the working band of the coupling device is 4MHz-21MHz. Based on capacitive coupling, we use coupling capacitance as the main element and design a coupling circuit. Filters are needed when the coupling device is receiving a signal. Based on Chebyshev filter, we design a band-pass filter and make a simulation.
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