Impedance matching device, power reception-side device, and control method

摘要

In an impedance matching device, a storage unit stores a control value representing a load value and a value equivalent to input impedance in advance. The control value identifies inductance and capacitance values matching a predetermined impedance value by use of either a first or second matching circuit. An impedance estimation unit estimates input impedance of the power transmission antenna. The load value estimation unit estimates load value of a circuit connected to a power reception antenna and consuming transmitted electric power. A circuit selection unit electrically connects the first matching circuit, the second matching circuit, or a through circuit per the load value and the input impedance equivalent value. A control value output unit reads out the control value stored in the storage unit based on the load value and the input impedance equivalent value, and outputs the control value to the circuit selected by the circuit selection unit.

主权项

1. An impedance matching device provided between a power transmission circuit and a power transmission antenna, the impedance matching device comprising:
an input impedance estimation unit configured to estimate an input impedance of the power transmission antenna; a matching circuit configured to perform impedance matching between the power transmission circuit and the power transmission antenna; a control communication unit configured to receive an estimated value of a load from a power reception-side device, the power reception-side device including a reception antenna and the load, the reception antenna being electromagnetically connected to the transmission antenna and receiving a wireless electric power signal transmitted from the power transmission antenna; and an output unit configured to output a control value for controlling the matching circuit based on the estimated value of the load and the input impedance.