Patent ID: 8860367

Claim:
A wireless electrical charging apparatus, comprising: a power-supply unit configured to generate power to be transferred to a power receiving apparatus; a power transferring device configured to transfer the power generated by the power-supply unit to the power receiving apparatus; a power relaying device configured to relay the power transferred by the power transferring device to the power receiving apparatus; a power-relaying-device moving mechanism section configured to move the power relaying device; an impedance matching detector configured to detect an impedance matching state from a transferred-power signal generated in the wireless electrical charging apparatus; and a power-transfer control section configured to control the power-relaying-device moving mechanism section to adjust a position of the power relaying device so as to expose the power relaying device to the power transferring device in order to provide the impedance matching state in accordance with a result of detection carried out by the impedance matching detector, wherein, the power transferring device includes a first resonance element configured to transfer power received from the power-supply unit to the power receiving apparatus, the power relaying device includes a second resonance element configured to receive power supplied by the first resonance element via a magnetic-field resonance and transfer the power to the power receiving apparatus via the magnetic-field resonance, the power-relaying-device moving mechanism section is configured to move the power relaying device between (i) a first state in which the power relaying device does not relay the power transferred by the power transferring device to the power receiving apparatus and (ii) a second state in which the power relaying device relays the power transferred by the power transferring device to the power receiving apparatus, and the power-relaying-device moving mechanism section is configured to at least adjust the position of the power relaying device so as to expose the power relaying device to the power transferring device.