Faraday cage for wireless charging devices

• Main Authors: Graham, Christopher S, Larsson, Karl Ruben F, Haug, Grant S, Jol, Eric S, Kasar, Darshan R, Thompson, Paul J, Karanikos, Demetrios B
• Format: Patent
• Language: English
• Published: 02.07.2019
• Subjects: BASIC ELECTRIC ELEMENTS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERATION; INDUCTANCES; MAGNETS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; PRINTED CIRCUITS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; SYSTEMS FOR STORING ELECTRIC ENERGY; TRANSFORMERS; TRANSMISSION

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.