Wireless power transmitter
US10250076B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 2017 |
| Grant date | Apr 2, 2019 |
| Priority date | — |
| Expiry date | Nov 30, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/44
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A wireless power transmitter that supplies power to a load. The wireless power transmitter includes an inverter, a voltage phase detector, a current phase detector, a phase difference counter, a controller and an impedance tuning circuit. The phase difference counter counts a phase difference between the voltage phase and the current phase at the output port of the inverter. The controller receives the phase difference from the phase difference counter and generates a control signal that changes an output impedance of the inverter in response to changes of a varying impedance of the load that is coupled with the output port of the inverter wirelessly. The impedance tuning circuit receives the control signal from the controller and tunes an imaginary part of the output impedance of the inverter to zero in order to maximize a power transfer efficiency from the wireless power transmitter to the load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.