US 12,334,751 B2
Wireless power transmitter, wireless power receiver, and wireless power transfer system
Yuki Tanaka, Tokyo (JP); Ryosuke Hasaba, Kanagawa (JP); Yoshio Koyanagi, Kanagawa (JP); and Kazuki Kanai, Kanagawa (JP)
Assigned to PANASONIC HOLDINGS CORPORATION, Osaka (JP)
Filed by PANASONIC CORPORATION, Osaka (JP)
Filed on Feb. 7, 2022, as Appl. No. 17/650,137.
Application 17/650,137 is a continuation of application No. PCT/JP2020/043744, filed on Nov. 25, 2020.
Claims priority of application No. 2019-220407 (JP), filed on Dec. 5, 2019.
Prior Publication US 2022/0158496 A1, May 19, 2022
Int. Cl. H02J 50/23 (2016.01); H02J 7/00 (2006.01); H02J 50/40 (2016.01)
CPC H02J 50/23 (2016.02) [H02J 7/0029 (2013.01); H02J 50/40 (2016.02)] 10 Claims
OG exemplary drawing
 
1. A wireless power transfer system comprising:
a first wireless power transmitter; and
a second wireless power transmitter; and
at least one backscatter signal receiver configured to receive a backscatter signal from a wireless power receiver,
wherein the first wireless power transmitter comprises:
a first antenna configured to transmit a first radio wave;
a phase shift circuit configured to change a phase of the radio wave transmitted from the first antenna; and
a first control device configured to control the phase shift circuit; and
wherein the second wireless power transmitter comprises:
a second antenna configured to transmit a second radio wave;
a second phase shift circuit configured to change a phase of the second radio wave; and
a second control device configured to control the second phase shift circuit,
wherein the backscatter signal is modulated by the wireless power receiver according to a radio wave received by the wireless power receiver; and
wherein the first control device is configured to execute phase optimization processing of controlling the first phase shift circuit so that a strength of the backscatter signal received by the at least one backscatter signal receiver is maximized,
wherein the second control device is configured to execute phase optimization processing of controlling the second phase shift circuit so that a strength of the backscatter signal is maximized, and
wherein the first control device and the second control device are configured to sequentially perform phase optimization processing one by one, and the phase optimization processing is performed according to: control of a host device connected to the first wireless power transmitter and second wireless power transmitter, or predetermined priorities of the first wireless power transmitter and second wireless power transmitter.