Wireless energy transfer with reduced fields

  • US 9,306,635 B2
  • Filed: 01/28/2013
  • Issued: 04/05/2016
  • Est. Priority Date: 01/26/2012
  • Status: Active Grant
  • ×
    • Pin Icon | RPX Insight
    • Pin
First Claim
Patent Images

1. A system for wireless power transfer, comprising:

  • a first source magnetic resonator comprising a conductive first coil having one or more loops coupled to at least one capacitor;

    a second source magnetic resonator comprising a conductive second coil having one or more loops, the second source magnetic resonator positioned at a non-zero distance from the first source magnetic resonator; and

    a device magnetic resonator positioned closer to the first source magnetic resonator than to the second source magnetic resonator,wherein during operation of the system;

    a first current flowing in the first source magnetic resonator generates a first magnetic field that couples to the device magnetic resonator to transfer operating power to the device magnetic resonator, and the magnetic field has a first dipole moment;

    a second current flowing in the second source magnetic resonator generates a second magnetic field having a second dipole moment, wherein a direction of the first dipole moment is substantially opposite to a direction of the second dipole moment; and

    wherein the first and second source magnetic resonators are positioned so that the second magnetic field at least partially cancels the first magnetic field outside a spatial region through which power is transferred from the first source magnetic resonator to the device magnetic resonator.

View all claims
  • 1 Assignment