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Dual transformer communication interface

  • US 9,705,562 B2
  • Filed: 06/23/2008
  • Issued: 07/11/2017
  • Est. Priority Date: 07/25/2006
  • Status: Active Grant
First Claim
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1. An alternating current power line communication interface device comprising:

  • communication interface circuitry including;

    a first signal source configured to generate a first data encoded signal;

    first signal conditioning circuitry connected to the first signal source for modifying the first data encoded signal;

    a first transformer connected to the first signal conditioning circuitry and configured to receive and transform an output from the first signal conditioning circuitry at a primary winding, the primary winding having a secondary to primary winding ratio that is greater than one;

    second signal conditioning circuitry connected to the first transformer for modifying an output from the first transformer;

    a second transformer connected in series with the second signal conditioning circuitry to receive and transform an output from the second signal conditioning circuitry at a primary winding of the second transformer, the second transformer including a secondary winding electromagnetically coupled to the primary winding to provide an output signal, the second transformer having a secondary-to-primary winding ratio that is greater than one;

    the first transformer and the second transformer configured to change a voltage of the first data encoded signal in a stepwise fashion; and

    signal coupling circuitry coupled to the secondary winding of the second transformer, the signal coupling circuitry configured to couple the output signal to the alternating current power line.

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