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Loop powered isolated contact input circuit and method for operating the same

  • US 9,541,604 B2
  • Filed: 04/29/2013
  • Issued: 01/10/2017
  • Est. Priority Date: 04/29/2013
  • Status: Active Grant
First Claim
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1. A method of determining information concerning a switching device, the method comprising:

  • sensing a voltage at the switching device using a voltage sensing circuit, the voltage associated with a status of the switching device;

    converting the sensed voltage to a useable voltage regardless of a value and a type of the sensed voltage;

    at a single self-contained integrated circuit that is powered by the sensed voltage;

    converting the useable voltage into a digital representation using the conversion block, the digital representation configured to be usable by a processing device to determine the value of the voltage at the switching device;

    wherein the voltage sensing circuit comprises a bridge rectifier, a constant voltage block, and a reference generator and further comprises a first isolation circuit and a second isolation circuit, the first isolation circuit and the second isolation circuit coupled to the conversion block such that the first isolation circuit and the second isolation circuit isolate the conversion circuit from an external processing device.

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