Power feeding apparatus, power receiving apparatus, wireless power feeding system and method for wireless transfer of power

摘要

A power feeding apparatus, power receiving apparatus, wireless power feeding system, and method for wireless transfer of power are provided. The power feeding apparatus includes an impedance detector, a controller, a power transmitter, a variable matching circuit, and a signal transmitter. The controller is configured to provide first control information and second control information based on an impedance detected by the impedance detector. The power feeding apparatus' variable matching circuit is configured to change a variable diameter of a power feeding coil according to the first control information. The power receiving apparatus includes a power receiver, a signal receiver, and a variable matching circuit. The power receiving apparatus'variable matching circuit is configured to change a variable diameter of a power feeding coil according to the second control information provided by the power feeding apparatus.

主权项

1. A power feeding apparatus comprising:
an impedance detector; a controller configured to provide first control information and second control information based on an impedance detected by the impedance detector; a power transmitter configured to wirelessly transmit power, the power transmitter including a power feeding coil with a variable diameter; a variable matching circuit configured to change the variable diameter of the power feeding coil according to the first control information; and a signal transmitter configured to wirelessly transmit the second control information; wherein the second control information is based on an external current state of an external variable matching circuit, associated with an external device, and an external impedance of the external device; and a storage device configured to store impedance characteristic information including a relationship between an impedance characteristic of the power feeding apparatus and an external impedance characteristic of the external device.