US 12,218,517 B2
Wireless power transmission system and resonance frequency adjustment unit for wireless power transmission system
Hiromasa Saeki, Nagaokakyo (JP); Masaya Tamura, Toyohashi (JP); and Suzuka Akai, Toyohashi (JP)
Assigned to Murata Manufacturing Co., Ltd., Kyoto (JP); and NATIONAL UNIVERSITY CORPORATION TOYOHASHI UNIVERSITY OF TECHNOLOGY, Aichi (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto (JP); and NATIONAL UNIVERSITY CORPORATION TOYOHASHI UNIVERSITY OF TECHNOLOGY, Aichi (JP)
Filed on Aug. 1, 2023, as Appl. No. 18/363,412.
Application 18/363,412 is a continuation of application No. PCT/JP2021/042458, filed on Nov. 18, 2021.
Claims priority of application No. 2021-015045 (JP), filed on Feb. 2, 2021.
Prior Publication US 2023/0378814 A1, Nov. 23, 2023
Int. Cl. H02J 50/12 (2016.01); H02J 50/00 (2016.01); H02J 50/90 (2016.01)
CPC H02J 50/12 (2016.02) [H02J 50/005 (2020.01); H02J 50/90 (2016.02)] 20 Claims
OG exemplary drawing
 
1. A wireless power transmission system comprising:
a structure entirely surrounded by an electromagnetic wave shielding member having appropriate electrical conductivity and appropriate frequency selectivity;
at least one power receiving unit;
at least one power transmission unit; and
at least one resonance frequency adjuster,
wherein the resonance frequency adjuster includes:
at least one conductive protrusion having an open end; and
a transmission line connected to another end of the conductive protrusion at one end of the transmission line,
wherein the open end of the conductive protrusion is inside the structure,
the transmission line is electrically connected to the electromagnetic wave shielding member defining a wall surface of the structure at another end not connected to the conductive protrusion,
the power transmission unit includes a power transmitter, a matching circuit, and a power supply,
the matching circuit is configured to adjust to match an impedance between the power transmission unit and the structure at a pre-set transmission frequency, and
the wireless power transmission system is configured to use a constant transmission frequency.