Method and system for performing foreign object detection in an inductive wireless power transfer system
US9474031B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 2015 |
| Grant date | Oct 18, 2016 |
| Priority date | — |
| Expiry date | Apr 16, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B5/79
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for performing foreign object detection in an inductive wireless power transfer system is disclosed. In the embodiment, the method involves obtaining measurements from a base station of a wireless power transfer system during charging and determining transmitter energy loss in a power transmitter, Ptxloss, using the obtained measurements, wherein the transmitter energy loss, Ptxloss, is a function of at least Vcap and PTx, wherein Vcap is proportional to the voltage amplitude across the capacitor of an LC tank circuit in a power transmitter and PTx is the total power supplied to the power transmitter. The method also involves detecting the presence of a foreign object in response to the estimated transmitter energy loss.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.