POWER RECEPTION DEVICE, POWER TRANSMISSION DEVICE, AND NONCONTACT POWER TRANSFER APPARATUS

摘要

A power receiving device capable of receiving alternating-current power in a wireless manner from a power supply device includes a secondary side coil, a fluctuating load, an impedance conversion unit, and a grasping unit. The secondary side coil is able to receive the alternating-current power from a primary side coil. The impedance of the fluctuating load fluctuates according to the power value of inputted power. The impedance conversion unit is provided between the secondary side coil and the fluctuating load and configured such that the impedance thereof is variable. The grasping unit grasps the power value of the alternating-current power outputted from an alternating-current power supply. The impedance of the impedance conversion unit is variably controlled when an electric characteristic dependent on the relative positions of the primary side coil and the secondary side coil fluctuates in the situation in which the grasping unit grasps that the power value of alternating-current power outputted from the alternating-current power supply does not fluctuate.