The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 02, 2013
Filed:
Dec. 22, 2010
Valter Nilsson, Hovås, SE;
Valter Nilsson, Hovås, SE;
Rosemount Tank Radar AB, Gothenburg, SE;
Abstract
A loop-powered 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 loop-powered field device comprising: a measurement device for determining the process variable; and loop interface circuitry for providing the measurement signal to the two-wire current loop and for providing power from the two-wire current loop to the measurement device. The loop interface circuitry comprises: current control circuitry connected to the two-wire current loop and the measurement device, the current control circuitry being controllable by the measurement device to provide the measurement signal to the two-wire current loop; a first converter having inputs connected to the two-wire current loop in series with the current control circuitry, and an output for providing power to the measurement device; and voltage regulation circuitry for regulating a voltage across the current control circuitry towards a desired voltage, by controlling an input voltage across the inputs of the first converter.