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US 2016/0291579 A1Published application
Saturation-controlled loop current regulator
AssigneeRosemount Inc.
InventorsClarence Edward Holmstadt, Robert Ernest LaRoche, Steven J. McCoy
Life of this patent
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Abstract
A process transmitter includes device circuitry that generates values that are to be conveyed on a current loop. A series control transistor is in series between the current loop and the device circuitry and a saturation prevention circuit prevents the series control transistor from entering saturation.
Claims23
A process transmitter comprising:
- device circuitry that generates values that are to be conveyed on a current loop;
- a series control transistor in series between the current loop and the device circuitry;
- and
- a saturation prevention circuit that prevents the series control transistor from entering saturation.
1 more element
A process field device comprising:
- control loop connectors for connection to a process control loop;
- device circuitry;
- and
- a current regulator in series between a control loop connector and the device circuitry wherein the current regulator controls a current level on the control loop and provides a power output that has a maximum power that scales with a voltage provided on the process control loop.
1 more element
A process field device comprising:
- two loop connectors for connection to a current loop;
- device circuitry;
- and
- a current controller in series between one of the two loop connectors and the device circuitry wherein the current controller is capable of controlling a current level in the current loop while providing a fixed voltage drop between the current loop and the device circuitry for a plurality of current levels in the current loop.
1 more element
Dependencies are inferred from the claim text.