INDUCTIVE MODULE

• US 20190097462A1
• Filed: 09/20/2018
• Published: 03/28/2019
• Est. Priority Date: 02/15/2017
• Status: Abandoned Application

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Larsson, Karl Ruben F., Jol, Eric S., Graham, Christopher S., Oro, Aaron A.
• Application Number:
  US16/137,431
• Publication Number:
  US 20190097462A1
• Time in Patent Office: Days
• CPC Class Codes: H01F 27/006 with special arrangement or spacing of turns of the winding(s), e.g. to produce desired self-resonance
• CPC Class Codes: H01F 27/22 Cooling by heat conduction through solid or powdered fillings
• CPC Class Codes: H01F 27/24 Magnetic cores
• CPC Class Codes: H01F 27/255 made from particles H01F27/26 takes precedence
• CPC Class Codes: H01F 27/28 Coils; Windings; Conductive connections
• CPC Class Codes: H01F 27/2871 Pancake coils
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

Embodiments describe a wireless power receiving module to receive magnetic flux for wireless power transfer. The wireless power receiving module includes a receiver coil comprising a single length of wire wound into a plurality of turns, an electromagnetic receiver shield coupled to a first side of the receiver coil, a ferrite layer coupled to a second side of the receiver coil opposite of the first side, the ferrite layer positioned to redirect magnetic flux during the charging event to improve charging efficiency, and a thermal mitigation shield comprising a thermally conductive layer adhered to an electrically conductive layer where the electrically conductive layer is coupled to ground, and where the ferrite layer is sandwiched between the thermal mitigation shield and the receiver coil.

Claims

1. (canceled)

3. The wireless power receiving module of claim 1, further comprising a thermal mitigation shield coupled to the ferrite layer on a side opposite from the receiver coil.

4. The wireless power receiving module of claim 3, wherein the thermally conductive layer comprises graphite and the electrically conductive layer comprises copper.

5. The wireless power receiving module of claim 1, wherein the electromagnetic receiver shield is a passive component that is grounded and configured to discharge voltage generated by the plurality of electric fields to ground.

6. The wireless power receiving module of claim 1, wherein the electromagnetic receiver shield comprises silver.

2. A wireless power receiving device, comprising:

a housing having a back surface;

a receiver coil disposed in the housing;

an electromagnetic receiver shield coupled to a first side of the receiver coil and positioned between the receiver coil and the back surface of the housing; and

a ferrite layer coupled to a second side of the receiver coil opposite of the first side.