Single-conductor power line communications system
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United States of America Patent
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-
Dec 22, 1987
Grant Date -
N/A
app pub date -
Dec 31, 1986
filing date -
Dec 31, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A power line communications (PLC) system utilizes a single conductor of a multiple-conductor power-transmission circuit, for carrying signal current, injected by at least one transmitter in series with that single conductor, to at least one receiver also coupled to that power line circuit. Each transmitter includes a saturable AC coupler connecting a switch to the conductor, while providing DC isolation therebetween. Each transmitter provides a signaling current having a frequency at least two orders of magnitude greater than the power line frequency, during at least some portion of each power line waveform signal cycle when the coupler is not saturated. Each transmitter preferably includes a power supply for providing transmitter operating potential responsive to the load current carried in that single conductor utilized for system signaling.
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