# US 2019/0097462 A1 · Inductive module

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- Number: US 2019/0097462 A1
- Document ID: US20190097462A1
- Status: Published application
- Kind: A1
- Application number: 16/137,431
- Filed: 2018-09-20
- Published: 2019-03-28
- Earliest claimed: 2017-02-15
- Assignees: Apple Inc.
- Applicants: Apple Inc.
- Inventors: Karl Ruben F. Larsson; Eric S. Jol; Christopher S. Graham; Aaron A. Oro
- Web page: https://patentgrep.com/patent/US20190097462A1

## CPC

- 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}
- H01F 27/22: Cooling by heat conduction through solid or powdered fillings
- H01F 27/24: Magnetic cores
- H01F 27/255: made from particles (H01F27/26 takes precedence)
- H01F 27/28: Coils; Windings; Conductive connections
- H01F 27/36: Electric or magnetic shields or screens (movable for varying inductance H01F21/10)
- H01F 38/14: Inductive couplings
- H02J 50/12: of the resonant type
- H04B 5/79: for data transfer in combination with power transfer
- H01F 27/006: {with special arrangement or spacing of turns of the winding(s), e.g. to produce desired self-resonance}
- H01F 27/2871: {Pancake coils}
- H02J 50/10: using inductive coupling
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H04B: TRANSMISSION

## 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

### Claim 1

(canceled)

### Claim 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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 3)

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

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

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