LOOP-POWERED FIELD DEVICE WITH IMPROVED LOOP CURRENT CONTROL
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United States of America Patent
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Issued Date -
Mar 14, 2024
app pub date -
Jul 13, 2023
filing date -
Sep 9, 2022
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Abstract
A field device comprising a first loop terminal and a second loop terminal; a measurement unit; a loop current control device for controlling the loop current to encode a process variable determined by the measurement unit, the loop current control device being provided in the electric circuit between the first loop terminal and an a first node of the electric circuit; an asymmetrically conducting device provided in the electric circuit between the first node of the electric circuit and a second node of the electric circuit; an energy storage device in the electric circuit between the second node of the electric circuit and the second loop terminal; and a controllable shunt regulator provided in the electric circuit between the first node of the electric circuit and the second loop terminal, wherein the measurement unit is in the electric circuit between the second node and the second loop terminal.
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