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Two-wire industrial process field device with power scavenging

  • US 8,786,128 B2
  • Filed: 05/02/2011
  • Issued: 07/22/2014
  • Est. Priority Date: 05/11/2010
  • Status: Active Grant
First Claim
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1. A process field device for use in monitoring or controlling an industrial process, comprising:

  • first and second loop terminals configured to couple to a two-wire industrial process control loop;

    field device circuitry configured to monitor or control a process variable of the industrial process, the field device circuitry powered by power from the two-wire industrial process control loop;

    a current regulator connected in series with the two-wire industrial process control loop, the first and second loop terminals and the field device circuitry, the current regulator configured to control a loop current flowing through the two-wire process control loop; and

    a voltage regulator connected in parallel with the current regulator and in series with the two-wire industrial process control loop, the first and second loop terminals and field device circuitry, the voltage regulator configured to control a voltage across the field device circuitry.

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