Shielding in vehicle wireless power systems

  • US 10,300,800 B2
  • Filed: 03/31/2017
  • Issued: 05/28/2019
  • Est. Priority Date: 09/27/2008
  • Status: Active Grant
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First Claim
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1. A system for wirelessly charging a battery in a vehicle, the system comprising:

  • a source electromagnetic resonator capable of generating an electromagnetic field, the source electromagnetic resonator having an intrinsic quality factor Qs greater than 100 and a perturbed quality factor Qs(p) when a lossy object is located within the electromagnetic field of the source electromagnetic resonator;

    a device electromagnetic resonator configured to be mounted to the vehicle and positionable within the electromagnetic field of the source electromagnetic resonator to receive energy wirelessly from the source electromagnetic resonator and charge the battery in the vehicle; and

    a shield having at least one layer of a conducting material and at least one layer of a magnetic material, the shield configured to be positioned between the source electromagnetic resonator and the lossy object during the wireless charging,wherein the presence of the shield increases the perturbed quality factor Qs(p) of the source electromagnetic resonator relative to that in the absence of the shield when the shield is positioned between the source electromagnetic resonator and the lossy object; and

    wherein wireless energy transfer between the source electromagnetic resonator and the device electromagnetic resonator has a perturbed coupling factor k(p) in the presence of the lossy object and wherein the presence of the shield decreases the perturbed coupling factor k(p) relative to that in the absence of the shield.

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