Near field RF communicators having refined energy sharing characterisitics utilizing improved shunt current control
US8588682B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 14, 2008 |
| Grant date | Nov 19, 2013 |
| Priority date | — |
| Expiry date | Jun 13, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B5/45
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A near field RF communicator has an inductive coupler (223) to enable inductive coupling with a magnetic field of an RF signal; a rectifier (213,214,215,216) to rectify an AC voltage derived from an RF signal inductively coupled to the inductive coupler (223); and a regulator (209,210,211,220,221,900) to regulate a voltage derived from an RF signal inductively coupled to the inductive coupler, the regulator having a voltage-controlled impedance (210, 211) and a regulator controller (209) to provide a control voltage for the voltage controlled impedance and to vary the control voltage in dependence upon a current flowing through the voltage controlled impedance (210, 211). To prevent the voltage regulator from drawing excess current and energy from an RF field in which the communicator is present the voltage regulator is controlled to provide a chosen impedance characteristic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.