Zero-crossing slotted foreign object detection
US11398752B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 4, 2020 |
| Grant date | Jul 26, 2022 |
| Priority date | — |
| Expiry date | Jan 1, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J50/80
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Systems, methods and apparatus for wireless charging are disclosed. A method for operating a charging device includes providing a charging current to a resonant circuit when a receiving device is present on a surface of the wireless charging device, providing a zero-crossing signal that includes edges corresponding to transitions of a voltage measured across the resonant circuit through a zero volt level or to transitions of a current in the resonant circuit through a zero ampere level, providing a measurement slot by decreasing or terminating the charging current for a period of time, and determining whether an object other than the receiving device is present on a surface of the charging device based on measurements of samples of voltage or current captured based on timing provided by the zero-crossing signal, wherein the samples are captured during the measurement slot.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.