DATA TRANSMISSION DEVICE IN POWER SUPPLY CABLE NETWORKS

摘要

In a data transmission device in power supply cable networks with at least one transmission and/or receiving device (4, 5) at the beginning and end of the screened power transmission cable (1) forming the transmission path, there are coupling members each formed by a coil (3) which are connected on one side to the screen (1) of the power transmission cable (2) and are at zero potential on the other. Data transmitters (4) and receivers (5) are connected to the side of the appropriate coil (3) linked to the screen (1). Each data transmitter (4) has an oscillator for a carrier frequency which is at least approximately the same as the resonant frequency of the oscillation circuit formed by the coils (3) fitted at the beginning and end of the transmission path and the capacitance of the screen (1). Each data transmitter (4) has a modulator and each data receiver (5) has a demodulator for the modulation of the carrier frequency with the data to be transmitted or for its demodulation.