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Smart meter voltage and current sensing using optically coupled isolators

  • US 9,000,753 B1
  • Filed: 07/14/2014
  • Issued: 04/07/2015
  • Est. Priority Date: 07/14/2014
  • Status: Active Grant
First Claim
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1. A method of sensing current within a smart meter comprising:

  • coupling a first resistor to a high voltage portion of the smart meter; and

    optically coupling the high voltage portion to a low voltage portion;

    wherein the optical coupling is provided by an infrared (IR) emitting diode on the high voltage portion and an optical transistor on the low voltage portion;

    wherein the IR emitting diode and the optical transistor comprises a optically coupled isolator;

    wherein a second resistor (RD) coupled to the IR emitting diode provides a bias condition to the IR emitting diode;

    wherein the second resistor (RD) is determined by the equation

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