Patent ID: 9006934
Filing Date: 2015-04-14
Classification: H02J,H03F

Abstract:
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.