Apparatus, system, and method for detecting a foreign object in an inductive wireless power transfer system via coupling coefficient measurement
US9551805B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 2012 |
| Grant date | Jan 24, 2017 |
| Priority date | — |
| Expiry date | Jun 12, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J50/80
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An inductive wireless power device comprises a transmitter configured to generate an electromagnetic field to a coupling region for wireless power transfer to a receiver, and control logic configured to determine a coupling coefficient of the wireless power transfer when the receiver is within the coupling region. The control logic also determines a presence of a foreign object within the coupling region responsive to a comparison of the determined coupling coefficient and an expected coupling coefficient for the wireless power transfer. An inductive wireless power device comprises a receiver configured to couple with an electromagnetic field in a coupling region for inductive wireless power transfer from a transmitter. The receiver is configured to alter a wireless power transfer characteristic of the transmitter for a determination of a presence of a foreign object within the coupling region responsive to a determination of a coupling coefficient of the wireless power transfer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.