RF impedance detection using two point voltage sampling
US8674782B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 2011 |
| Grant date | Mar 18, 2014 |
| Priority date | — |
| Expiry date | Sep 3, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H7/40
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An adaptive impedance matching module having an adjustable impedance matching network with an input for receiving an RF power source and an output to be connected to an antenna, and first and second voltage measurement device configured to sense a voltage at respective first and second nodes on the impedance matching network. A network adjuster circuit is provided to switch the impedance matching network between a first state where first and second voltages are sensed on the respective first and second nodes and a second state where third and fourth voltages are sensed on the respective first and second nodes. Processing circuitry is provided which determines the matched load impedance based upon the first, second, third and fourth sensed voltages and including matching adjustment circuitry configured to adjust the matching impedance in the event the matched load impedance differs from a target load impedance by more that a predetermined amount.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.