Wireless power system with device movement detection
US11050307B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 2020 |
| Grant date | Jun 29, 2021 |
| Priority date | — |
| Expiry date | Feb 21, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J2310/22
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A wireless power system has a wireless power transmitting device such as a charging mat with a charging surface and a wireless power receiving device that receives wireless power from coils overlapped by the charging surface. The wireless power transmitting device receives load current and load voltage measurements from the wireless power receiving device and uses this information to produce one or more load lines. The load lines may form a family of load lines each associated with a different respective duty cycle used by inverter circuitry in the wireless power transmitting device in transmitting wireless power signals using the coils. The control circuitry can determine whether the wireless power receiving device has moved by comparing current and voltage information from the wireless power receiving device to the family of load lines and can take appropriate action such as measuring coil inductances for use in subsequent coil selection operations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.