US 11,056,918 B2
System for inductive wireless power transfer for portable devices
Sanjaya Maniktala, Fremont, CA (US)
Assigned to CHARGEDGE, INC., Fremont, CA (US)
Filed by ChargEdge, Inc., Fremont, CA (US)
Filed on Dec. 12, 2016, as Appl. No. 15/375,499.
Claims priority of provisional application 62/266,128, filed on Dec. 11, 2015.
Prior Publication US 2017/0170688 A1, Jun. 15, 2017
Int. Cl. H02J 50/12 (2016.01); H01F 27/255 (2006.01); H01F 38/14 (2006.01); H02J 7/02 (2016.01); H01F 27/26 (2006.01)
CPC H02J 50/12 (2016.02) [H01F 27/255 (2013.01); H01F 38/14 (2013.01); H02J 7/025 (2013.01); H01F 27/26 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A wireless power transfer system comprising:
a wireless power receiver comprising
a ferrite core, wherein a cross section of the ferrite core is solid,
a receiver coil having a length wrapped around the ferrite core such that the ferrite core and the receiver coil share a longitudinal axis, wherein the receiver coil is disposed at a substantially same angle to the longitudinal axis along the length of the receiver coil, and
a receive circuit coupled to the receiver coil configured to convert a time varying current induced in the receiver coil into a voltage,
wherein the wireless power receiver includes an externally visible marking that indicates the longitudinal axis of the ferrite core and the receiver coil; and
a housing in which the wireless power receiver is disposed, an external portion of the housing configured for a predetermined alignment between the receiver coil and the housing.