Patent ID: 11955818
Assignee: ELECTDIS AB
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. A power transmit device, arrangeable in a wireless power transfer system to transfer power over an inductive wireless power transfer interface operating at a transmit frequency, fTX, to a power receive device, the wireless power transfer system being of a type which is adapted to transfer information at half duplex using Frequency Shift Keying, FSK, in one direction and Amplitude Shift Keying, ASK, in the other direction, wherein the power transmit device comprises a transmit controller operatively connected to a power transfer circuitry, and wherein the transmit controller is configured to cause the power transfer circuitry to:
transfer, at the transmit frequency, fix, power to the power receive device, and during the transferring,
receive, at the transmit frequency, using one of two modulation types being FSK or ASK, a first data packet and, during the receiving and if a signaling condition is determined to be fulfilled,
transmit, at the transmit frequency, fTX, operational information using the other of said modulation types.