Patent attributes
In a power transmission terminal, a charging control unit outputs an alternating current signal having a charging control voltage based on a charging control signal. A power transmission unit excites a near-electromagnetic field. A primary-side signal processing unit acquires a reception signal on the basis of a voltage at the power transmission unit at the time of load modulation communication and sets the charging control signal on the basis of reference information included in the reception signal. In a power receiving terminal, a power receiving unit is couplable to the near-electromagnetic field excited by power transmission unit. A charging voltage generating unit generates a charging voltage for a rechargeable battery. A load modulation unit changes the load impedance of the power receiving unit as viewed from the power transmission unit by performing load modulation at the time of load modulation communication. A secondary-side signal processing circuit controls the load modulation unit at the time of load modulation communication using the acquired reference information.
