Method for detecting foreign material, and device and system therefor
US10916973B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 2019 |
| Grant date | Feb 9, 2021 |
| Priority date | — |
| Expiry date | Aug 13, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/00045
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for detecting a foreign object disposed in a charging area of a wireless power transmitter can include transmitting, by the wireless power transmitter, a power signal having a predetermined strength; measuring, via a controller, a peak frequency of the power signal; receiving, from a wireless power receiver, information about a reference peak frequency of the wireless power receiver; determining, via the controller, a threshold frequency based on the reference peak frequency; and determining, via the controller, whether the foreign object is present in the charging area based on a comparison of the measured peak frequency of the power signal with the determined threshold frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.