Wireless inductive power transfer
US10170943B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 19, 2015 |
| Grant date | Jan 1, 2019 |
| Priority date | — |
| Expiry date | Oct 2, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2338
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A power transmitter (101) provides power transfer to a power receiver (105) using a wireless inductive power transfer signal. The power transmitter (101) comprises an inductor (103) generating the power transfer signal when a voltage drive signal is applied. A measurement unit (311) performs measurements of a current or voltage of the inductor (103). The measurements are performed with a time offset relative to a reference signal synchronized to the voltage drive signal. An adaptor (313) can vary the time offset to determine an optimum measurement timing offset resulting in a maximum demodulation depth which reflects a difference measure for measurements for different modulation loads of the power transfer signal. A demodulator (309) then demodulates load modulation of the inductive carrier signal from measurements with the time offset set to the optimum measurement timing offset. In some scenarios, both the timing and duration of measurements may be varied. The approach improves communication reliability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.