Wireless power transmitter circuit and method capable of detecting wireless power receiver and foreign object
US12362601B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 2023 |
| Grant date | Jul 15, 2025 |
| Priority date | — |
| Expiry date | Dec 1, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J50/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A wireless power transmitter circuit includes: an inverter circuit including plural switches coupled to a resonant transmitter circuit; and a transmitter controller circuit for generating a PWM control signal, to control the plural switches, thus generating a wireless transmission power via the resonant transmitter circuit in a power supply procedure, so that a wireless power supply is accordingly provided to a wireless power receiver circuit. In a groping procedure, transmitter controller circuit controls the plural switches to generate a wireless test power via the resonant transmitter circuit based on an operation frequency. The groping procedure includes: measuring a peak of a transmission signal corresponding to the wireless test power; determining, according to the peak of the transmission signal, whether a foreign object exists and/or whether the wireless power receiver circuit is present. When it is determined that the wireless power receiver circuit is present, the power supply procedure is performed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.