Loop-powered field device with voltage regulator and current source in series
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United States of America Patent
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Jan 9, 2018
Grant Date -
Nov 24, 2016
app pub date -
May 22, 2015
filing date -
May 22, 2015
priority date (Note) -
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Abstract
The present invention relates to a field device for determining a process variable and providing a measurement signal indicative of the process variable to a remote location via a two-wire current loop. The field device comprises a measurement device for determining the process variable; a current control device electrically connected in series with the measurement device and controllable by the measurement device to provide the measurement signal to the two-wire current loop; and voltage regulation circuitry electrically connected in series with the current control device and the measurement device for controlling a voltage across the current control device towards a desired voltage by varying a voltage across the voltage regulation circuitry.
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