| 摘要 |
An impedance matching device is arranged between a power transmission circuit and a power transmission antenna. A storage unit associates a control value to a load value and a value equivalent to input impedance and stores same beforehand, said control value corresponding to an inductance value and a capacitance value that are required for matching to a prescribed impedance value using a first or a second matching circuit. An impedance estimation means estimates a value equivalent to input impedance for the power transmission antenna. A load value estimation means estimates the load value for a circuit connected to a power reception antenna and consuming transmitted power. A circuit selection means electrically connects to one among a first matching circuit, a second matching circuit, and a through circuit, on the basis of the load value and the value equivalent to input impedance. A control value output means reads the control value stored by the storage unit and outputs the control value to the circuit selected by the circuit selection means, on the basis of the load value and the value equivalent to input impedance. |
