Magnetic inductive charging with low far fields

A power receiver apparatus for wirelessly receiving electrical power from a charging station, comprising:

• a receiver coil having a planar shape;
• and
• a capacitor CR connected in parallel across the receiver coil, said capacitor serving to resonate the receiver coil, wherein,
• whenever the power receiver apparatus is placed in close proximity to a planar charging surface of the charging station which generates a plurality of alternating electromagnetic flux fields in a direction perpendicular to the charging surface, one or more of the flux fields wirelessly induce electrical power in the receiver coil.

A charging station apparatus for wirelessly transmitting electrical power to mobile electronic devices (MEDs), comprising:

• a planar charging surface;
• a first prescribed even number of series-interconnected bank A source coils which are alternately wound in a different direction;
• a second prescribed even number of series-interconnected bank B source coils which are alternately wound in a different direction;
• and
• source electronics for energizing the bank A and bank B source coils, wherein,
• whenever energized, each source coil generates an alternating electromagnetic flux field in a direction perpendicular to the charging surface,
• the flux fields cancel each other out in a far-field environment,
• the bank A source coils and the bank B source coils are interleaved and alternately energized in a repeating duty cycle, so that the MEDs can have any two-dimensional orientation with respect to the charging surface.