Shielding in vehicle wireless power systems
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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Abstract
A wireless power system for powering a television includes a source resonator, configured to generate an oscillating magnetic field, and at least one television component attached to at least one device resonator, wherein the at least one device resonator is configured to wirelessly receive power from the source resonator via the oscillating magnetic field when the distance between the source resonator and the at least one device resonator is more than 5 cm, and wherein at least one television component draws at least 10 Watts of power.
702 Citations
23 Claims
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1. A system for wirelessly charging a battery in a vehicle, the system comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A power supply system for wirelessly charging a battery in a vehicle, the system comprising:
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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; 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 during operation a device electromagnetic resonator mounted to the vehicle and positioned within the electromagnetic field of the source electromagnetic resonator receives energy wirelessly from the source electromagnetic resonator to charge the battery in the vehicle;
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; andwherein 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. - View Dependent Claims (11, 12, 13, 14)
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15. A method to improve wireless charging of a battery in a vehicle, the method comprising:
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providing a shield having at least one layer of a conducting material and at least one layer of a magnetic material; and positioning the shield between a source electromagnetic resonator and a lossy object during the wireless charging, wherein the source electromagnetic resonator is capable of generating an electromagnetic field, the source electromagnetic resonator having an intrinsic quality factor Qs and a perturbed quality factor Qs(p) when the lossy object is located within the electromagnetic field of the source electromagnetic resonator; wherein a device electromagnetic resonator mounted to the vehicle and positioned within the electromagnetic field of the source electromagnetic resonator receives energy wirelessly from the source electromagnetic resonator to charge the battery in the vehicle; 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. - View Dependent Claims (16, 17, 18)
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19. A system for wirelessly charging a battery in a vehicle, the system comprising:
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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. - View Dependent Claims (20, 21, 22, 23)
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Specification