US 11,682,925 B2
Wireless power transmission apparatus for minimizing magnetic field exposure based on cavity resonance
Sanghoek Kim, Suwon-si (KR); and Sung Ik Park, Suwon-si (KR)
Assigned to UNIVERSITY-INDUSTRY COOPERATION GROUP OF KYUNG HEE UNIVERSITY, Yongin-si (KR)
Filed by UNIVERSITY-INDUSTRY COOPERATION GROUP OF KYUNG HEE UNIVERSITY, Yongin-si (KR)
Filed on Oct. 21, 2021, as Appl. No. 17/507,162.
Claims priority of application No. 10-2020-0184937 (KR), filed on Dec. 28, 2020.
Prior Publication US 2022/0209580 A1, Jun. 30, 2022
Int. Cl. H02J 50/12 (2016.01); H02J 50/70 (2016.01)
CPC H02J 50/12 (2016.02) [H02J 50/70 (2016.02)] 9 Claims
OG exemplary drawing
 
1. A wireless power transmission system including a wireless power transmission apparatus and a wireless power receiver,
wherein the wireless power receiver comprises a reception cavity, and
wherein the wireless power transmission apparatus comprises:
a transmission cavity leaking electromagnetic waves to the reception cavity of the wireless power receiver through cavity-resonance with the reception cavity; and
a nonlinear feedback circuit formed on a feedback path including the transmission cavity and configured to adaptively control an operating frequency in response to a change in a system resonance frequency according to the cavity-resonance,
wherein each of the transmission cavity and the reception cavity includes a body part having a cavity formed therein, and a mesh part formed of a conductor on the body part.