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Positioner

  • US 10,458,569 B2
  • Filed: 11/18/2016
  • Issued: 10/29/2019
  • Est. Priority Date: 11/18/2015
  • Status: Active Grant
First Claim
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1. A positioner, comprising:

  • an air circuit comprising a magnetism generator that generates magnetism based on an electric current in accordance with a difference between a valve opening setpoint for a regulator valve that is to be controlled and a measured valve opening value for the regulator valve, the air circuit generating a pneumatic signal adjust air pressurewherein the pneumatic signal is generated based on the magnetism produced by the magnetism generator, and is supplied to an operating device of the regulator valve, andthe magnetism generator includes a plurality of separate coils that are connected in parallel electrically and that are additively coupled magnetically, wherein the magnetism generator further comprises;

    a main interconnection to supply the electric current;

    a plurality of branch interconnections, provided for each of the plurality of coils, branching from the main interconnection; and

    a plurality of Zener diodes, provided for each of the plurality of coils, wherein a corresponding coil and corresponding Zener diodes are connected in parallel with each of the branch interconnections.

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