Method for foreign object detection for an induction charging device and induction charging device
US10326317B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 26, 2015 |
| Grant date | Jun 18, 2019 |
| Priority date | — |
| Expiry date | Aug 26, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W4/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for foreign object detection for an induction charging device is described, including an oscillator circuit, in particular, for a hand-held power tool, a resonance frequency and an associated actual quality of the oscillator circuit being detected and the actual quality is subsequently compared to a setpoint quality as a function of the resonance frequency and a decision is made about the presence of a foreign object based on a defined setpoint quality range. The method provides that an upper limit and/or a lower limit of the setpoint quality range and the profile of the actual quality are adapted to one another. Also described is an induction charging device including an oscillator circuit and a control and regulating unit for carrying out the method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.