Method for detecting foreign material, and apparatus and system therefor
US10862348B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 25, 2019 |
| Grant date | Dec 8, 2020 |
| Priority date | — |
| Expiry date | Jun 25, 2039 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T90/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of controlling a wireless power transmitter is discussed. The method includes transmitting a power signal having a predetermined strength; measuring a quality factor and a peak frequency of a coil of the wireless power transmitter using the power signal; receiving reference values including a reference quality factor and a reference peak frequency of a wireless power receiver; determining whether or not a foreign object is present in a charging area of the wireless power transmitter based on a comparison of the reference quality factor with the measured quality factor and a comparison of the reference peak frequency with the measured peak frequency; transmitting response signals indicating a result of the determination; and determining whether to continue or stop a wireless charging procedure based on the response signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.