Near field communications (NFC) device power harvesting and power supply selection
US8559872B2 · kind B2 · utility
230Cited by
3References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 23, 2009 |
| Grant date | Oct 15, 2013 |
| Priority date | — |
| Expiry date | Nov 12, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B5/26
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A near field RF communicator has an antenna circuit (102) to couple with the H field of an RF magnetic field and a power supply deriver (301) to derive a rectified auxiliary power supply from the received magnetic field. Rectification may be performed using an actively switched rectifier (502) having a passive mode of operation. A sub regulation system (506) is provided to regulate the auxiliary power supply to inhibit the possibility of temporally varying power requirements of the near field RF communicator or its host causing an apparent load modulation of a signal that is transmitted or received by the communicator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.