Two-wire industrial process field device with power scavenging
First Claim
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.
1 Assignment
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Accused Products
Abstract
A process field device for use in monitoring or controlling an industrial process includes first and second loop terminals configured to couple to a two-wire industrial process control loop. Field device circuitry is configured to monitor or control a process variable of the industrial process. The field device circuitry is powered by power connections from the two-wire industrial process control loop. A current regulator is 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 is configured to control a loop current flowing through the two-wire process control loop. A voltage regulator is connected in parallel with the current regulator and in series with the two-wire industrial process control loop, first and second loop terminals and field device circuitry. The voltage regulator is configured to control a voltage across the field device circuitry.
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Citations
18 Claims
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1. A process field device for use in monitoring or controlling an industrial process, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of providing power to a process field device for use in monitoring or controlling an industrial process, comprising:
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coupling first and second loop terminals to a two wire industrial process control loop; powering field device circuitry with power received from the two wire process control loop and monitoring or controlling a process variable of the industrial process with the field device circuitry; regulating a loop current flow through the two wire process control loop using a current regulator which is coupled in series with the first and second loop terminals and the field device circuitry; and regulating a voltage across the field device circuitry using a voltage regulator connected in parallel with the current regulator and in series with the two wire process control loop, the first and second loop terminals and the field device circuitry. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification