Variable liftoff voltage process field device
US7970063B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 10, 2008 |
| Grant date | Jun 28, 2011 |
| Priority date | — |
| Expiry date | Dec 9, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08C2201/10
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A field transmitter includes field device circuitry configured to measure or control a process variable. A first process control loop terminal is configured to couple to a two-wire process control loop which carries a loop current. A second process control loop terminal configured to couple to the two-wire process control loop. A switching regulator has an input and an output. The output is coupled to the transmitter circuitry and arranged to provide power to the transmitter circuitry. A variable voltage source having an input electrically coupled to the first process control loop terminal, and a voltage output coupled to the input of the switching regulator and a control input. The voltage output is a function of the control input.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.