US 11,756,719 B2
Wireless power system
Narendra S. Mehta, San Carlos, CA (US); Stephen C. Terry, San Jose, CA (US); and Rohan Dayal, Daly City, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Sep. 24, 2021, as Appl. No. 17/484,954.
Application 17/484,954 is a continuation of application No. 16/424,331, filed on May 28, 2019, granted, now 11,133,696.
Claims priority of provisional application 62/791,587, filed on Jan. 11, 2019.
Prior Publication US 2022/0014046 A1, Jan. 13, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H02J 50/10 (2016.01); H02J 50/12 (2016.01); H01F 27/28 (2006.01); H01F 38/14 (2006.01); H01M 10/42 (2006.01); H02J 50/00 (2016.01); H02J 50/50 (2016.01); H02J 50/40 (2016.01)
CPC H01F 27/28 (2013.01) [H01F 38/14 (2013.01); H01M 10/425 (2013.01); H02J 50/005 (2020.01); H02J 50/10 (2016.02); H02J 50/12 (2016.02); H02J 50/502 (2020.01); H02J 50/40 (2016.02)] 20 Claims
OG exemplary drawing
 
1. A battery case that is operable in a system having a wireless power transmitting device and having a wireless power receiving device that is removably attached to the battery case, comprising:
a battery;
a first coil;
a second coil;
switching circuitry configured to couple and decouple the first and second coils; and
control circuitry configured to selectively place the switching circuitry in (1) an open state and (2) a closed state, wherein
in the closed state, the first and second coils are shorted together, power is received wirelessly by the first coil from the wireless power transmitting device and induces a given current to flow through the first coil and causes the given current to flow through the second coil, and the second coil provides the power wirelessly to the wireless power receiving device, and
in the open state, the first and second coils are not shorted together and power is received wirelessly by the first coil from the wireless power transmitting device to charge the battery.