WIRELESS INDUCTIVE POWER TRANSFER Russian patent published in 2019 - IPC H02J50/10 H04B5/00 

FIELD: electrical engineering.

SUBSTANCE: wireless power transfer system includes power transmitter (201) arranged to provide power transfer to power receiver (205) via a power transfer signal. Power receiver (205) comprises first mode controller (709) for transmitting a standby mode exit request to power transmitter (201) by changing the loading of communication inductor (209) of power transmitter (201). Power transmitter (201) comprises mode controller (405) which controls power transmitter (201) to operate in a standby mode wherein presence of power receiver (205) is detected but no power transfer signal is generated. It furthermore comprises detector (403) for detecting an impedance change of communication inductor (209). Mode controller (405) is arranged to initiate a transition from the standby mode to a power transfer mode in response to detector (403) detecting the impedance change.

EFFECT: improved efficiency and / or operation of a wireless power transfer system.

14 cl, 23 dwg