US 12,288,635 B2
Wireless charging system with a switchable magnetic core
Zaki Moussaoui, Micco, FL (US); Zelin Xu, San Jose, CA (US); Matthew J. Chabalko, Salinas, CA (US); and Nan Liu, Sunnyvale, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on May 10, 2024, as Appl. No. 18/661,432.
Application 18/661,432 is a division of application No. 17/179,603, filed on Feb. 19, 2021, granted, now 12,014,857.
Claims priority of provisional application 63/041,729, filed on Jun. 19, 2020.
Prior Publication US 2024/0296989 A1, Sep. 5, 2024
Int. Cl. H02J 7/00 (2006.01); H01F 27/24 (2006.01); H01F 38/14 (2006.01); H02J 7/02 (2016.01); H02J 50/12 (2016.01); H02J 50/90 (2016.01)
CPC H01F 27/24 (2013.01) [H01F 38/14 (2013.01); H02J 7/02 (2013.01); H02J 50/12 (2016.02); H02J 50/90 (2016.02)] 20 Claims
OG exemplary drawing
 
1. An accessory for an electronic device, wherein the electronic device has a first coil configured to transmit first wireless power signals and a second coil configured to receive second wireless power signals from a wireless power transmitting device, the accessory comprising:
a coil configured to receive the first wireless power signals from the first coil in the electronic device when the accessory is coupled to the electronic device; and
a ferrimagnetic core overlapping the coil, wherein the ferrimagnetic core operates in:
a first state when the accessory and the electronic device are inductively coupled to the wireless power transmitting device, wherein the ferrimagnetic core has a first magnetic reluctance in the first state; and
a second state when the accessory and the electronic device are not inductively coupled to a wireless power transmitting device, wherein the ferrimagnetic core has a second magnetic reluctance that is less than the first magnetic reluctance in the second state.