Independent field device for automation purposes with intrinsic safety barrier
US8355689B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 2009 |
| Grant date | Jan 15, 2013 |
| Priority date | — |
| Expiry date | Apr 6, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/25462
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The invention relates to an autarkic field device or an autarkic radio adapter (2) for a field device (1), of automation technology fed with limited energy via an energy supply unit (3) associated, or associable, with the field device (1) or the radio adapter (2), characterized in that, between the energy supply unit (3) and an internal voltage source (4), whose voltage exceeds, or at times can exceed, the voltage of the energy supply unit (3), a barrier (5a; 5b) of at least one diode group having at least two diodes (6) connected in parallel is arranged, which blocks flow of electrical current from the internal voltage source (4) to the energy supply unit (3) or to the connection terminals (7) of the field device (1) or of the radio adapter (2) for the energy supply unit (3).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.