Apparatus and method for wireless power transfer

A wireless power transfer method in which a wireless power transfer device comprising a resonant circuit comprising an adaptive circuit comprising at least one variable capacitor and a first inductor, and a first DC power supply wirelessly transfers power to an external device, the method comprising:

• applying a generated control signal to the first DC power supply;
• applying a DC voltage output from the first DC power supply to the adaptive circuit based on the generated control signal;
• adjusting a capacitance of the at least one variable capacitor based on the DC voltage;
• and
• transferring wireless power through the first inductor based on the adjusted capacitance.

A computer program product comprising a non-transitory computer readable recording medium,

• wherein the non-transitory computer readable recording medium comprises a computer program command for performing a power transfer method performed by a wireless power transfer device comprising a resonant circuit comprising an adaptive circuit comprising at least one variable capacitor and a first inductor, and a first DC power supply and wirelessly transferring power to an external device, and
• wherein the power transfer method comprises:
• applying a generated control signal to the first DC power supply;
• applying a DC voltage output from the first DC power supply to the adaptive circuit based on the generated control signal;
• adjusting capacitance of the at least one variable capacitor based on the DC voltage;
• and
• transferring wireless power through the first inductor based on the adjusted capacitance.