Enhanced foreign object detection with coil current sensing in wireless power transfer systems
US11527920B2 · kind B2 · utility
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19Claims
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Key dates
| Filing date | May 3, 2019 |
| Grant date | Dec 13, 2022 |
| Priority date | — |
| Expiry date | May 3, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J50/60
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Embodiments described herein provide foreign object detection based on coil current sensing. The transmitter power loss is computed directly based on the coil current, in conjunction with, or in place of the conventional computation based on transmitter input current. The enhanced precision of the computer power loss can be used to more accurately detect a foreign object near the transmitter coil during a wireless power transfer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.