Foreign object detection circuit using current measurement
US11046193B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2018 |
| Grant date | Jun 29, 2021 |
| Priority date | — |
| Expiry date | Jan 15, 2039 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T90/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present disclosure describes techniques for detecting foreign objects by detecting changes in an electrical characteristic of an array of sense elements for detection objects based on a current measurement approach. In some aspects, an apparatus for measuring changes in current for detecting objects is provided. The apparatus includes a plurality of sense circuits each comprising a sense coil, the plurality of sense circuits each electrically connected to a common output node. The apparatus further includes a driver circuit electrically connected to the plurality of sense circuits and configured to operate as a voltage source and selectively apply a voltage signal at an operating frequency to each of the plurality of sense circuits. The apparatus further includes a current measurement circuit electrically connected to the common output node. The current measurement circuit is configured to provide a measurement output proportional to an electrical current at the common output node.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.