US 12,218,527 B2
Method and apparatus for controlling power in wireless power transfer system
Chun Kil Jung, Suwon-si (KR); and Sang Youn Noh, Suwon-si (KR)
Assigned to Dolby Laboratories Inc., San Francisco, CA (US)
Appl. No. 15/522,773
Filed by GE HYBRID TECHNOLOGIES, LLC, Niskayuna, NY (US)
PCT Filed Nov. 3, 2015, PCT No. PCT/KR2015/011714
§ 371(c)(1), (2) Date Oct. 17, 2017,
PCT Pub. No. WO2016/072706, PCT Pub. Date May 12, 2016.
Claims priority of application No. 10-2014-0151175 (KR), filed on Nov. 3, 2014; and application No. 10-2014-0184408 (KR), filed on Dec. 19, 2014.
Prior Publication US 2018/0138758 A1, May 17, 2018
Int. Cl. H02J 50/80 (2016.01); H02J 7/00 (2006.01); H02J 50/12 (2016.01); H02J 50/40 (2016.01); H02J 50/90 (2016.01)
CPC H02J 50/80 (2016.02) [H02J 50/12 (2016.02); H02J 50/90 (2016.02); H02J 7/00036 (2020.01); H02J 7/00047 (2020.01); H02J 50/402 (2020.01)] 19 Claims
OG exemplary drawing
 
1. A method for controlling wireless power transmission, comprising:
transmitting wireless power from a wireless power transmitter to a plurality of peripheral devices within a power transmission coverage of the wireless power transmitter;
receiving, by a power control apparatus, a plurality of control error values from the plurality of peripheral devices;
gradually decreasing an amount of transmission power of the wireless power transmitter until a power reception efficiency of a first peripheral device of the plurality of peripheral devices is reduced below a threshold value;
selecting, by the power control apparatus, the first peripheral device to be a reference peripheral device; and
adjusting, by the power control apparatus, the wireless power transmitted to the plurality of peripheral devices by an amount based, at least in part, on the amount of transmission power when the power reception efficiency of the first peripheral device is reduced below the threshold value and one or more control error values from the reference peripheral device.