Wireless power system with foreign object detection
US11258307B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 10, 2020 |
| Grant date | Feb 22, 2022 |
| Priority date | — |
| Expiry date | Apr 25, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/0047
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A wireless power system has a wireless power transmitting device and a wireless power receiving device. The wireless power transmitting device may be a wireless charging mat or other device with a charging surface. The wireless power receiving device may be a portable electronic device receiving transmitted wireless power signals from the wireless power transmitting device while resting on the charging surface. During digital ping operations, low-power wireless power signals may be transmitted from the wireless power transmitting device. Information gathered during the digital ping such as wireless power transmission efficiency information, coupling coefficient information, Q-factor information, and coil inductance information may be used in determining whether a foreign object is present. Control circuitry in the transmitting device can cause the receiving device to present an alert for a user indicating that wireless power transfer operations are commencing in response to determining that no foreign object is present.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.