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Transmitting signals over alternating current power networks

  • US 4,371,867 A
  • Filed: 10/01/1980
  • Issued: 02/01/1983
  • Est. Priority Date: 08/25/1977
  • Status: Expired due to Term
First Claim
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1. A method of producing intelligence signals for transmission over the lines of an alternating current power supply network in response to an input reference signal comprising:

  • connecting a resonant circuit including a capacitive device to the lines of the power supply network;

    controlling the charging and discharging of said capacitive device from the power supply network;

    said charging and discharging of said capacitive device being controlled in response to intelligence to be transmitted to periodically charge said capacitive device so that said resonant circuit produces an intelligence signal for transmission over the power supply network; and

    wherein said control is effected in dependence on a comparison of the current flowing through said resonant circuit and the reference signal.

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