US 9,812,875 B2
Systems and methods for adjusting magnetic field distribution using ferromagnetic material
Saeed Nejatali, San Diego, CA (US); Francesco Carobolante, Carlsbad, CA (US); Ryan Tseng, Coronado, CA (US); Mei-Li Chi, San Diego, CA (US); and Seong Heon Jeong, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Sep. 5, 2014, as Appl. No. 14/478,461.
Prior Publication US 2016/0072296 A1, Mar. 10, 2016
Int. Cl. H02J 5/00 (2016.01); H02J 7/02 (2016.01); H02J 7/00 (2006.01); H01F 38/14 (2006.01); H02J 50/12 (2016.01)
CPC H02J 5/005 (2013.01) [H01F 38/14 (2013.01); H02J 7/0044 (2013.01); H02J 7/025 (2013.01); H02J 50/12 (2016.02)] 30 Claims
OG exemplary drawing
 
1. A device for wireless power transfer, comprising:
a substantially planar transmit antenna configured to generate a magnetic field;
a pad having a charging surface, at least a portion of the transmit antenna being disposed in the pad; and
a ferromagnetic material having a shape and a position relative to the transmit antenna, at least one of the shape or position of the ferromagnetic material, or combination thereof, selected to modify a distribution of the magnetic field at the charging surface.