US 12,283,826 B2
Power receiving device and wireless power transfer system
Hidehito Yoshida, Tokyo (JP); and Tomokazu Sakashita, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 18/267,100
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Feb. 5, 2021, PCT No. PCT/JP2021/004378
§ 371(c)(1), (2) Date Jun. 14, 2023,
PCT Pub. No. WO2022/168272, PCT Pub. Date Aug. 11, 2022.
Prior Publication US 2024/0055898 A1, Feb. 15, 2024
Int. Cl. H02J 50/12 (2016.01); H02J 50/40 (2016.01); H02J 50/70 (2016.01)
CPC H02J 50/12 (2016.02) [H02J 50/40 (2016.02); H02J 50/70 (2016.02)] 6 Claims
OG exemplary drawing
 
1. A power receiving device for a wireless power transfer system, the power receiving device to which electric power is transmitted from a power transmitting device that includes a power transmitting source to generate a high frequency voltage and a power-transmitting resonant circuit with a power transmitting coil to generate an AC magnetic flux by resonance when receiving the high frequency voltage, the power receiving device comprising:
a power-receiving resonant circuit to receive the AC magnetic flux transmitted from the power-transmitting resonant circuit and convert the AC magnetic flux into AC power;
a rectifier circuit to convert the AC power outputted from the power-receiving resonant circuit into DC power;
a filter to attenuate a high frequency component included in the output from the rectifier circuit; and
at least one compensation element provided to cancel out a variation of an inductance of the power transmitting coil, the variation attributable to movement of the power-receiving resonant circuit to a position where electric power can be received,
wherein the at least one compensation element includes an inductive reactance element connected in parallel between the power-receiving resonant circuit and the rectifier circuit, and an inductive reactance element magnetically coupled with the power transmitting coil.