Methods for improved transfer efficiency in a multi-dimensional inductive charger

  • US 9,112,362 B2
  • Filed: 12/10/2012
  • Issued: 08/18/2015
  • Est. Priority Date: 01/18/2011
  • Status: Active Grant
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First Claim
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1. A system for improved transfer efficiency in a multi-dimensional charger, comprising:

  • a base unit having one or more transmitter coils;

    a receiver and receiver coil associated with one or more mobile device or battery, skin, case or battery door associated therewith;

    a switching layer having magnetic properties and covering the one or more transmitter coils or the receiver coil, so that, during charging or powering of the mobile device, or battery, skin, case or battery door associated therewith, the switching layer is layered eitherbetween the one or more transmitter coils and a surface of the base unit, orbetween the receiver coil and a surface of the receiver; and

    wherein one or more components are used to modify one or both the magnitude or phase of an electromagnetic field in one or multiple dimensions, including wherein, when the mobile device, or battery, skin, case or battery door having the receiver coil is placed close to the base unit having the one or more transmitter coils, the switching layer'"'"'s magnetic properties are locally modified, by one or more of a magnetic field of the receiver coil or transmitter coils, or by another magnetic component, to allow power transfer in the particular region of the layer generally aligned both with the one or more transmitter coils and the receiver coil; and

    one or more repeater antennas within the base unit, mobile device, battery or additional systems or components, for improving transfer efficiency between the base unit and the mobile device, skin, case or battery door, including wherein the transmitter coils and receiver coil are resonant antennas, and wherein the one or more repeater antennas increase resonance between the transmitter coils and receiver coil, to extend an operable range between the one or more transmitter coils and the receiver coil;

    wherein each of the transmitter coils and the receiver coils or receivers includes or is associated with a resonant antenna, and the system further includes one or more repeaters inserted between the transmitter and receiver resonant antennas.

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