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Method of, and apparatus for, information communication via a power line conductor

  • US 4,745,391 A
  • Filed: 02/26/1987
  • Issued: 05/17/1988
  • Est. Priority Date: 02/26/1987
  • Status: Expired due to Term
First Claim
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1. A method for transmission of information over at least one conductor of a power distribution system, comprising the steps of:

  • (a) receiving, at a transmitter, a local data signal containing the information to be transmitted;

    (b) receiving, at the transmitter, at least one PLC signal, each at a power-line-carrier (PLC) communications frequency and each from an associated first conductor portion of the system;

    (c) processing the local data signal and the at least one PLC signal to generate in the transmitter an output PLC signal, also at the PLC frequency;

    (d) coupling at least a portion of the output PLC signal through the non-saturating core of a transmitter-coupling current transformer to inject a PLC current into a second conductor portion of the system; and

    (e) recovering the transmitted information with a receiver connected to a system conductor at a location different from the location of the transmitter.

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