Foreign object detection for wireless power transfer systems
US11904712B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 2022 |
| Grant date | Feb 20, 2024 |
| Priority date | — |
| Expiry date | Sep 10, 2042 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T90/14
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Foreign objects impinging on a ground transceiver assembly (GTA) of a wireless power transfer (WPT) station are detected using a two-stage foreign object detection system. In a first stage, at least one camera is positioned to observe a charging position of the GTA and an area surrounding the charging position. In a second stage, an impedance measurement circuit measures an impedance of a wireless power transfer coil of the GTA. An imaging processor analyzes images from the at least one camera to identify changes or features indicative of introduction of a foreign object onto an exposed surface of the GTA or in the area surrounding the charging position. A foreign object detection (FOD) controller triggers an impedance inspection of the GTA by the impedance measurement circuit and initiates a failsafe operation when movement of an object crossing into or over the charging position is detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.