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Signal coupling apparatus for power line communications using a three-phase four-wire power line

  • US 7,977,810 B2
  • Filed: 11/21/2008
  • Issued: 07/12/2011
  • Est. Priority Date: 11/23/2007
  • Status: Active Grant
First Claim
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1. A signal coupling apparatus for power line communications using a three-phase four-wire power line, comprising:

  • a first signal coupler connected to a first-phase power line;

    a second signal coupler connected to a second-phase power line;

    a third signal coupler connected to a third-phase power line;

    a switching unit selectively connected to the first signal coupler, the second signal coupler, or the third signal coupler; and

    a control circuit outputting a switching control signal to electrically connect the switching unit to the first signal coupler, the second signal coupler or the third signal coupler wherein the control circuit determines input impedance based on a signal received from the first signal coupler, the second signal coupler or the third signal coupler through the switching unit, and selects a transmission mode according to the input impedance.

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