US 12,438,395 B2
Wireless power transfer system
Osamu Miki, Nagaokakyo (JP); and Tatsuya Hosotani, Nagaokakyo (JP)
Assigned to Murata Manufacturing Co., Ltd., Kyoto-fu (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto-fu (JP)
Filed on Dec. 19, 2022, as Appl. No. 18/068,459.
Application 18/068,459 is a continuation of application No. PCT/JP2021/004031, filed on Feb. 4, 2021.
Claims priority of application No. 2020-112478 (JP), filed on Jun. 30, 2020.
Prior Publication US 2023/0124799 A1, Apr. 20, 2023
Int. Cl. H02J 50/12 (2016.01); H02J 50/40 (2016.01); H02J 50/90 (2016.01)
CPC H02J 50/12 (2016.02) [H02J 50/402 (2020.01); H02J 50/90 (2016.02)] 17 Claims
OG exemplary drawing
 
1. A wireless power transfer system comprising:
a power transmission circuit that includes a power transmission resonance mechanism including a power transmission coil and a power transmission resonant capacitor; and
at least one power reception circuit that includes a power reception resonance mechanism including a power reception coil that magnetically couples to the power transmission coil and a power reception resonant capacitor, the wireless power transfer system being configured to wirelessly supply power from the power transmission coil to the power transmission coil, wherein
the power transmission circuit includes a parallel connection circuit including a plurality of power transmission resonance mechanisms, which are each the power transmission resonance mechanism,
the power transmission circuit includes a direct-current power supply and a switching circuit, and the switching circuit being configured to intermittently and periodically supply direct-current power from the direct-current power supply to the plurality of power transmission resonance mechanisms, and
the plurality of power transmission resonance mechanisms and the power reception resonance mechanism create electromagnetic resonance coupling, and the power reception resonance mechanism is configured acquire reception power by superposing resonance currents induced by the electromagnetic resonance coupling.