US 11,843,257 B2
Power transmission apparatus and wireless power transmission system
Yuki Shoji, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Sep. 30, 2020, as Appl. No. 17/039,711.
Claims priority of application No. 2019-186618 (JP), filed on Oct. 10, 2019.
Prior Publication US 2021/0111592 A1, Apr. 15, 2021
Int. Cl. H02J 50/12 (2016.01); H02J 50/70 (2016.01)
CPC H02J 50/12 (2016.02) [H02J 50/70 (2016.02)] 5 Claims
OG exemplary drawing
 
1. A power transmission apparatus comprising:
a first switching element having a first terminal and a second terminal;
a first capacitor having a third terminal connected to the first terminal and a fourth terminal connected to the second terminal;
a power transmission inductor connected to the first switching element and configured to wirelessly transmit AC power; and
a second capacitor connected between the first terminal and the power transmission inductor,
wherein an impedance Zc of the second capacitor at a switching frequency ω of the first switching element is smaller than an impedance ZL of the power transmission inductor at the switching frequency f and Zc/ZL satisfies Zc/ZL<0.62.