WIRELESS ELECTRIC POWER TRANSMISSION DEVICE AND MANUFACTURING METHOD THEREFOR

摘要

The invention enables changes in an input impedance value of a wireless electric power transmission device, according to a load fluctuation tendency of an electric device to which electric power is supplied. The transmission characteristic for transmission between a power-feeding resonator and a power-receiving resonator of this wireless electric power transmission device has two peak bands. The power supply frequency of electric power to a power-feeding module of the wireless electric power transmission device is set to a power supply frequency band that corresponds to either one of the two peak bands of the transmission characteristic (S21), and the input impedance value of the wireless electric power transmission device including the power-supplied electric device at least for the power supply frequencies of the electric power is set so as to have two peak bands with respect to the maximum value of a load fluctuation range of the power-supplied electric device.

主权项

1. A wireless power transmission apparatus, configured to
supply power from a power-supplying module to a power-receiving module by varying a magnetic field, the power-supplying module comprising at least a power-supplying resonator, the power-receiving module comprising at least a power-receiving resonator, the power-receiving module connected to a device to be powered with variable load, wherein
a transmission characteristic, of the power-supplying resonator and the power-receiving resonator, with respect to the power-source frequency of the power has two peak bands, and the power-source frequency of the power supplied to the power-supplying module is set to a power-source frequency band corresponding to either one of the two peak bands of the transmission characteristic, andsetting is carried out so that, when the load in the device to be powered is at its maximum value within its load fluctuation range, the input impedance of the wireless power transmission apparatus including the device to be powered, with respect to the power-source frequency of the power has at least two peak bands.