Receiver Coil Arrangements for Inductive Wireless Power Transfer for Portable Devices

A wireless power receiver system comprising:

• at least one receiver coil structure of a first type, the at least one receiver coil structure of a first type comprising
• a ferrite core, and
• a receiver coil configured such that the ferrite core and the receiver coil share a longitudinal axis;
• at least one receiver coil structure of a second type, the at least one receiver coil structure of a second type comprising
• a magnetic layer, and
• a receiver coil in the shape of a flat spiral;
• and
• a receive circuit coupled to the at least one receiver coil structure of the first type and the at least one receiver coil structure of the second type, the receive circuit configured to receive a time varying current induced in at least one of the at least one receiver coil structure of the first type and the at least one receiver coil structure of the second type and to output a voltage.

An electronic device comprising:

• a plurality of receiver coil structures, each of the plurality of receiver coil structures comprising a receiver coil;
• a receive circuit coupled to each of the plurality of receiver coil structures, the receive circuit configured to receive a time varying current induced in at least one of plurality of receiver coils and to output a voltage;
• and
• a battery coupled to the receive circuit configured to be charged by the voltage.