RECEIVER DETUNING COMPENSATION USING TRANSMITTER FERRITE
First Claim
1. An apparatus for wireless power transfer, the apparatus comprising:
- a support member including a charging surface configured to support a power receiving element;
a power transmitting element configured to generate a magnetic field that can wirelessly transfer power to the power receiving element;
a metallic shield disposed such that the power transmitting element is disposed between the support member and the metallic shield, the metallic shield being configured to inhibit the magnetic field generated by the power transmitting element; and
a plurality of ferrite pieces spaced apart from each other and disposed between the power transmitting element and the metallic shield and closer to the metallic shield than to the power transmitting element, the plurality of ferrite pieces offsetting an effect of the metallic shield on a reactance of the power receiving element.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus for wireless power transfer includes: a support member including a charging surface configured to support a power receiving element; a power transmitting element configured to generate a magnetic field that can wirelessly transfer power to the power receiving element; a metallic shield disposed such that the power transmitting element is disposed between the support member and the metallic shield, the metallic shield being configured to inhibit the magnetic field generated by the power transmitting element; and ferrite pieces spaced apart from each other and disposed between the power transmitting element and the metallic shield and closer to the metallic shield than to the power transmitting element, the ferrite pieces offsetting an effect of the metallic shield on a reactance of the power receiving element.
-
Citations
25 Claims
-
1. An apparatus for wireless power transfer, the apparatus comprising:
-
a support member including a charging surface configured to support a power receiving element; a power transmitting element configured to generate a magnetic field that can wirelessly transfer power to the power receiving element; a metallic shield disposed such that the power transmitting element is disposed between the support member and the metallic shield, the metallic shield being configured to inhibit the magnetic field generated by the power transmitting element; and a plurality of ferrite pieces spaced apart from each other and disposed between the power transmitting element and the metallic shield and closer to the metallic shield than to the power transmitting element, the plurality of ferrite pieces offsetting an effect of the metallic shield on a reactance of the power receiving element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A method for wireless power transfer, the method comprising:
-
generating, from a power transmitting element, a magnetic field for wireless transfer of power to a power receiving element above the power transmitting element; shielding the magnetic field below the power transmitting element using a metal layer, the metal layer influencing a reactance of the power receiving element in a first direction; and locally influencing the reactance of the power receiving element in a second direction at a plurality of locations across the power receiving element to compensate for an influence of the metal layer on the reactance of the power receiving element. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
-
-
24. An apparatus comprising:
-
means for supporting a power receiving element; means for generating a magnetic field for wireless transfer of power to the power receiving element; means for shielding the magnetic field, the means for shielding configured to have a detuning influence on the power receiving element to influence a resonant frequency of the power receiving element away from a desired resonant frequency; and means for locally retuning the power receiving element at a plurality of locations on the means for shielding to influence the resonant frequency of the power receiving element toward the desired resonant frequency. - View Dependent Claims (25)
-
Specification