Method and apparatus for detecting objects in charging area of wireless charging transmitter
US11522391B2 · kind B2 · utility
1Cited by
3References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 12, 2017 |
| Grant date | Dec 6, 2022 |
| Priority date | — |
| Expiry date | Aug 16, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J50/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for detecting objects in a charging area of a wireless charging transmitter includes providing a bridge circuit that generates a ping signal, and providing the ping signal to a transmitter terminal. The method further includes monitoring at least one of a current of a power supply connected to the bridge circuit, and a current at the transmitter terminal to determine if an eligible object is in the charging area. The ping signal has parameters including frequency, duty cycle, and phase shift angle, where at least one of these parameters varies with time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.