Charging device having small loop transmission coils for wireless charging a target device
US10097031B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2016 |
| Grant date | Oct 9, 2018 |
| Priority date | — |
| Expiry date | Dec 20, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J50/402
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A charging device to wirelessly charge a target device, including: a coil antenna having a first surface facing a first direction at which the target device is placed for charging and a second surface facing an opposite direction from the first direction, generating a first magnetic field; a plurality of pairs of metallic small loop transmission coils arranged to the second surface side of the coil antenna, to generate a second magnetic field in response to the first magnetic field to enhance the first magnetic field, the first and second magnetic fields being directed in the first direction; and wherein a first one of each pair of metallic small loop transmission coils is coupled to a second one of the pair in parallel and a size of the first one of each pair is different from that of the second one of the pair, such that when a distance between the target device and the first surface is changed, one of the pair of metallic small loop transmission coils is enabled to be resonant with the coil antenna.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.