Electric shielding structures
Wireless power transmitting devices according to embodiments of the present technology may include a contact surface configured to support one or more wireless power receiving devices. The wireless power transmitting devices may include a plurality of coils. The wireless power transmitting devices may also include a shield positioned between the plurality of coils and the contact surface. The shield may include one or more shield members, each shield member axially aligned with a separate coil of the plurality of coils, and may include a multilayer structure exhibiting various conductivities.
1. A wireless power transmitting device, comprising:
a contact surface configured to support one or more wireless power receiving devices;
a plurality of coils; and
a shield positioned between the plurality of coils and the contact surface, wherein the shield comprises a plurality of shield members, each shield member axially aligned with a separate coil of the plurality of coils, wherein the shield comprises a conductive chassis extending about a perimeter of the shield, and wherein each shield member is electrically coupled with another shield member with a bridge or is electrically coupled with the conductive chassis with a conductive drain.
2. The wireless power transmitting device of claim 1 , wherein the shield comprises a conductive sheet spanning an internal area defined by the conductive chassis.
3. The wireless power transmitting device of claim 2 , wherein the conductive sheet comprises a first material, wherein the one or more shield members comprise a second material, and wherein the conductive sheet is characterized by a higher sheet resistance than the shield members.
4. The wireless power transmitting device of claim 1 , wherein the conductive drain is characterized by an arcuate shape, wherein the conductive drain is positioned between the at least one shield member and the conductive chassis, and wherein the conductive drain is shaped and positioned to limit overlap with an underlying coil relative to a straight-member conductive drain.
5. The wireless power transmitting device of claim 1 , wherein each coil of the plurality of coils is characterized by a substantially annular shape, and wherein each shield member of the one or more shield members comprises a body characterized by a substantially annular shape.
6. The wireless power transmitting device of claim 5 , wherein each shield member of the one or more shield members defines a gap extending from an inner annular edge of the body to an outer annular edge of the body, and wherein the gap forms a discontinuity about a circumference of each shield member.
7. The wireless power transmitting device of claim 6 , wherein each shield member further defines a plurality of slots extending from the inner annular edge of the body towards the outer annular edge of the body.
8. The wireless power transmitting device of claim 5 , wherein each shield member of the one or more shield members comprises a grounding pin extending from an inner annular edge of the body and electrically coupling the shield member with a ground of the wireless power transmitting device.
9. A wireless power transmitting device, comprising:
a contact surface configured to support one or more wireless power receiving devices;
a first layer of coils distributed in a first planar arrangement;
a second layer of coils vertically offset from the first layer of coils and positioned between the contact surface and the first layer of coils, the second layer of coils distributed in a second planar arrangement whereby coils of the second layer of coils are laterally offset from coils of the first planar arrangement; and
a shield positioned between the second layer of coils and the contact surface, wherein the shield comprises a shield member overlying and aligned with a coil of the second layer of coils, wherein the shield comprises a conductive chassis extending about a perimeter of the shield, wherein the shield comprises a plurality of shield members, and wherein each shield member is electrically coupled with another shield member with a bridge or is electrically coupled with the conductive chassis with a conductive drain.
10. The wireless power transmitting device of claim 9 , wherein the shield comprises a conductive sheet spanning an internal area defined by the conductive chassis.
11. The wireless power transmitting device of claim 10 , wherein the conductive sheet comprises silver, and wherein the shield member comprises copper.
12. A wireless power transmitting device, comprising:
a contact surface configured to support one or more wireless power receiving devices;
a plurality of coils; and
a shield positioned between the plurality of coils and the contact surface, wherein the shield comprises:
a conductive chassis,
a conductive sheet extending across an internal area defined by the conductive chassis, wherein the conductive sheet comprises a first material, and
a shield member positioned on the conductive sheet and overlying a coil of the plurality of coils, wherein the shield member comprises a second material, and wherein the conductive sheet is characterized by a higher sheet resistance than the shield member.
13. The wireless power transmitting device of claim 12 , wherein the shield comprises a plurality of shield members, and wherein each shield member is electrically coupled with another shield member with a bridge or is electrically coupled with the conductive chassis with a conductive drain.
14. The wireless power transmitting device of claim 13 , wherein each coil of the plurality of coils is characterized by a substantially annular shape, and wherein each shield member of the plurality of shield members comprises a body characterized by a substantially annular shape.
15. The wireless power transmitting device of claim 14 , wherein each shield member of the plurality of shield members defines a gap extending from an inner annular edge of the body to an outer annular edge of the body, and wherein the gap forms a discontinuity about a circumference of each shield member body.