Wireless charging system with receiver locating circuitry and foreign object detection
US10505401B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 2017 |
| Grant date | Dec 10, 2019 |
| Priority date | — |
| Expiry date | Feb 2, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J50/60
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A wireless power transmission system has a wireless power receiving device that is located on a charging surface of a wireless power transmitting device. The wireless power receiving device has a wireless power receiving coil and the wireless power transmitting device has a wireless power transmitting coil array. Control circuitry in the transmitting device uses inverter circuitry to supply alternating-current signals to coils in the coil array, thereby transmitting wireless power signals. Impulse response measurement circuitry coupled to the coil array is used to make impulse response measurements while the control circuitry uses the inverter circuitry to apply impulse signals to each of the coils. The control circuitry analyzes output from the impulse response measurement circuitry to measure inductances associated with the coils in the coil array.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.