Foreign object detection in a wireless power transfer system
US12298462B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 10, 2023 |
| Grant date | May 13, 2025 |
| Priority date | — |
| Expiry date | Aug 10, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J50/80
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
This disclosure provides systems, methods and apparatuses for foreign object detection (FOD) in a wireless power transfer (WPT) system. Some implementations relate generally to the use of detection coils that are excited to measure and compare a differential current through a coil pair that includes at least two detection coils. A foreign object may cause a change in impedance for one or more detection coils compared to one or more other detection coils. By detecting the differential current of the coil pair, a detection apparatus may determine that a foreign object is in proximity to one of the detection coils of the coil pair. This disclosure provides several options for the design, construction, layout, and operations of detection coils to improve foreign object detection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.