Faraday cage for wireless charging devices
First Claim
1. A wireless charging device comprising:
- a housing having a planar charging surface and one or more walls that define an interior cavity;
a transmitter coil arrangement positioned within the interior cavity, the transmitter coil arrangement including a plurality of transmitter coils positioned within the interior cavity in an overlapping arrangement such that different coils in the plurality of coils are on different planes and each of the plurality of transmitter coils has a central axis positioned a lateral distance away from the central axes of all other transmitter coils of the plurality of transmitter coils; and
a faraday cage enclosing the transmitter coil arrangement, the faraday cage comprising;
an electromagnetic shield positioned between the transmitter coil arrangement and a first shell;
an interconnection structure positioned within the interior cavity below the transmitter coil arrangement, the interconnection structure including a plurality of packaged electrical components mounted on the interconnection structure;
a ferromagnetic shield positioned between the transmitter coil arrangement and the interconnection structure; and
a conductive grounding fence disposed around a perimeter of the interconnection structure and between the electromagnetic shield and the interconnection structure.
1 Assignment
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Accused Products
Abstract
Embodiments describe a wireless charging device including: a housing having a planar charging surface and one or more walls that define an interior cavity; a transmitter coil arrangement positioned within the interior cavity; and a faraday cage enclosing the transmitter coil arrangement. The faraday cage includes: an electromagnetic shield positioned between the transmitter coil arrangement and the first shell; an interconnection structure positioned within the interior cavity below the transmitter coil arrangement, the interconnection structure including a plurality of packaged electrical components mounted on the interconnection structure; a ferromagnetic shield positioned between the transmitter coil arrangement and the interconnection structure; and a conductive grounding fence disposed around a perimeter of the interconnection structure and between the electromagnetic shield and the interconnection structure.
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Citations
20 Claims
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1. A wireless charging device comprising:
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a housing having a planar charging surface and one or more walls that define an interior cavity; a transmitter coil arrangement positioned within the interior cavity, the transmitter coil arrangement including a plurality of transmitter coils positioned within the interior cavity in an overlapping arrangement such that different coils in the plurality of coils are on different planes and each of the plurality of transmitter coils has a central axis positioned a lateral distance away from the central axes of all other transmitter coils of the plurality of transmitter coils; and a faraday cage enclosing the transmitter coil arrangement, the faraday cage comprising; an electromagnetic shield positioned between the transmitter coil arrangement and a first shell; an interconnection structure positioned within the interior cavity below the transmitter coil arrangement, the interconnection structure including a plurality of packaged electrical components mounted on the interconnection structure; a ferromagnetic shield positioned between the transmitter coil arrangement and the interconnection structure; and a conductive grounding fence disposed around a perimeter of the interconnection structure and between the electromagnetic shield and the interconnection structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wireless charging device comprising:
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a housing having a planar charging surface and one or more walls that define an interior cavity; a transmitter coil arrangement positioned within the interior cavity, the transmitter coil arrangement including a plurality of transmitter coils positioned within the interior cavity in an overlapping arrangement such that different coils in the plurality of coils are on different planes and each of the plurality of transmitter coils has a central axis positioned a lateral distance away from the central axes of all other transmitter coils of the plurality of transmitter coils; and a faraday cage enclosing the transmitter coil arrangement, the faraday cage comprising; an electromagnetic shield positioned between the transmitter coil arrangement and a first shell, wherein the electromagnetic shield comprises; an electromagnetic body configured to capture electromagnetic fields generated by the transmitter coil arrangement; and a copper border surrounding the electromagnetic body; an interconnection structure positioned within the interior cavity below the transmitter coil arrangement, the interconnection structure including a plurality of packaged electrical components mounted on the interconnection structure, wherein the interconnection structure is a printed circuit board (PCB); a ferromagnetic shield positioned between the transmitter coil arrangement and the interconnection structure; and a conductive grounding fence disposed around a perimeter of the interconnection structure and between the electromagnetic shield and the interconnection structure, wherein the conductive grounding fence is a length of wire formed of a conductive material, and wherein the copper border couples with the conductive grounding fence. - View Dependent Claims (11, 12)
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13. A wireless charging system, comprising:
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an electrical device comprising a receiver coil configured to generate a current to charge a battery when exposed to a time-varying magnetic flux; and a wireless charging mat configured to generate the time-varying magnetic flux to wirelessly charge the electrical device, the wireless charging mat comprising; a housing having a planar charging surface, the housing including first and second shells defining an interior cavity; a transmitter coil arrangement, the transmitter coil arrangement including a plurality of transmitter coils positioned within the interior cavity in an overlapping arrangement such that different coils in the plurality of coils are on different planes and each of the plurality of transmitter coils has a central axis positioned a lateral distance away from the central axes of all other transmitter coils of the plurality of transmitter coils; and a faraday cage enclosing the transmitter coil arrangement, the faraday cage comprising; an electromagnetic shield positioned between the transmitter coil arrangement and the first shell; an interconnection structure positioned within the interior cavity below the transmitter coil arrangement, the interconnection structure including a plurality of packaged electrical components mounted on the interconnection structure; a ferromagnetic shield positioned between the transmitter coil arrangement and the interconnection structure; and a conductive grounding fence disposed around a perimeter of the interconnection structure and between the electromagnetic shield and the interconnection structure. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification