US 9,812,889 B2
Battery charging system
Shu-Yuen Ron Hui, Hong Kong (CN)
Assigned to City University of Hong Kong, Hong Kong (HK)
Filed by City University of Hong Kong, Kowloon, Hong Kong (CN)
Filed on Nov. 14, 2014, as Appl. No. 14/542,452.
Application 14/542,452 is a continuation of application No. 13/269,936, filed on Oct. 10, 2011, granted, now 8,917,057.
Application 13/269,936 is a continuation in part of application No. 12/950,814, filed on Nov. 19, 2010, granted, now 8,269,456, issued on Sep. 18, 2012.
Application 12/950,814 is a continuation of application No. 12/486,572, filed on Jun. 17, 2009, granted, now 7,872,445, issued on Jan. 18, 2011.
Application 12/486,572 is a continuation of application No. 11/610,860, filed on Dec. 14, 2006, granted, now 7,576,514, issued on Aug. 18, 2009.
Application 11/610,860 is a continuation of application No. 11/009,478, filed on Dec. 10, 2004, granted, now 7,164,255, issued on Jan. 16, 2007.
Application 11/009,478 is a continuation of application No. PCT/AU03/00721, filed on Jun. 10, 2003.
Claims priority of application No. 0213374.2 (GB), filed on Jun. 10, 2002; application No. 0226893.6 (GB), filed on Nov. 18, 2002; and application No. 0305428.5 (GB), filed on Mar. 10, 2003.
Prior Publication US 2015/0077052 A1, Mar. 19, 2015
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 10/46 (2006.01); H02J 7/02 (2016.01); H01F 38/14 (2006.01); H02J 7/00 (2006.01); H01F 17/00 (2006.01)
CPC H02J 7/025 (2013.01) [H01F 38/14 (2013.01); H02J 7/0042 (2013.01); H01F 2017/008 (2013.01); H02J 7/0052 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A charging module for a battery charging system, said module comprising:
a charging surface for receiving a secondary module for charging an electronic device;
a plurality of transformer windings formed in a multilayer structure comprising at least two layers, the multilayer structure positioned beneath the charging surface, each of the transformer windings being substantially parallel to the charging surface, each of the layers comprising at least one transformer winding, a transformer winding of a second of the layers being offset relative to a transformer winding of a first of the layers; and
a charging circuit in a housing not including the charging surface or the multilayer structure, the charging circuit electrically coupled to the transformer windings.