Foreign object detector
US12431743B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2021 |
| Grant date | Sep 30, 2025 |
| Priority date | — |
| Expiry date | Sep 21, 2042 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/7072
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A foreign object detector includes multiple detection coils located between a transmitter coil in a transmitter device and a receiver coil in a receiver device to be electromagnetically coupled to one another, multiple capacitors each forming a resonant circuit together with a corresponding detection coil of the detection coils, a power supply circuit that supplies alternating current power having a predetermined frequency to each of the detection coils through a feeder coil located to be electromagnetically coupled to each of the detection coils, and a detection circuit that detects a voltage output from each of the detection coils and detects a foreign object between the transmitter coil and the receiver coil based on the detected voltage. The transmitter device transmits power to the receiver device contactlessly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.