Patent US10186912 Energy Financial Settlements

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Witricity Corporation | Website | LinkedIn | Headquarters: Watertown, Massachusetts

Patent US10186912

Issued 2019-01-22

Pickup Coil Design For Tight Spaces And Asymmetrical Coupling

Systems and methods for wireless power transmission are described herein. In one aspect, a charging pad to transfer power wirelessly comprises a power antenna assembly configured to receive wireless power. The power antenna assembly is configured to charge the battery based on the received wireless power. The charging pad further comprises a ferrite layer assembly. The charging pad further a shielding layer defining a shape configured to receive a part of the host device and/or conform to a shape of a host device. The shielding layer can define a notch or can define a concave shape.

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6 Independent Claims

1. A device for receiving power wirelessly, comprising: a power antenna assembly configured to receive wireless power from a transmit antenna, the power antenna assembly defining a first gap extending from a first surface to a second surface of, and through, the power antenna assembly, the first surface opposite the second surface, the power antenna assembly further configured to charge a battery based on the received wireless power; a ferrite layer assembly defining a second extending from a first surface to a second surface of, and through, the ferrite layer assembly, the first surface opposite the second surface, wherein the ferrite layer assembly surrounds the second gap on all sides in a plane shared by the ferrite layer assembly and the second gap; and a shielding layer configured to shield components other than the power antenna assembly and the ferrite layer assembly from the wireless power of the transmit antenna, the shielding layer protruding into the second gap, defining a cavity, the cavity also protruding into the second gap, and separating the first gap from the second gap.
15. A device for wireless power transfer, the device comprising: means for receiving wireless power from a wireless field generated by a transmit antenna, the means for receiving defining a first gap extending from a first surface to a second surface of, and through, the means for receiving wireless power, the first surface opposite the second surface and the means for receiving wireless power configured to charge a battery based on the received wireless power; means for altering the wireless field defining a second gap extending from a first surface to a second surface of, and through, the means for altering, the first surface opposite the second surface, wherein the means for altering surrounds the second gap on all sides in a plane shared by the ferrite layer and the second gap; and means for shielding means other than the means for receiving and the means for altering from the wireless field generated by the transmit antenna, the means for shielding protruding into the second gap, defining a cavity, the cavity also protruding into the second gap, and separating the first gap from the second gap.
19. A method of charging a battery via a charging pad, the method comprising: receiving wireless power from a wireless field, generated by a transmit antenna, using an antenna assembly to provide power to charge the battery, the antenna assembly defining a first gap extending from a first surface to a second surface of, and through, the antenna assembly, the first surface opposite the second surface; altering the wireless field using a ferrite layer, the ferrite layer wirelessly coupled to the antenna assembly, the ferrite layer defining a second gap extending from a first surface to a second surface of, and through, the ferrite layer, the first surface opposite the second surface, wherein the ferrite layer surrounds the second gap on all sides in a plane shared by the ferrite layer and the second gap; and shielding components other than the antenna assembly and the ferrite layer from the wireless field generated by the transmit antenna using a shielding layer, wherein the shielding layer protrudes into the second gap, defines a cavity, the cavity also protruding into the second gap, and separating the first gap from the second gap, the charging pad comprising the antenna assembly, the ferrite layer, and the shielding layer.
23. A device for receiving power wirelessly via a wireless field generated by a transmit antenna, comprising: a shielding layer having a concave shape facing and positioned below a non-planar mounting surface; a concave ferrite layer assembly having a concave shape facing and positioned below the shielding layer, the ferrite layer comprising at least a first ferrite portion having a first surface that defines a first plane and a second ferrite portion having a second surface that defines a second plane that is not coplanar with the first plane, wherein the first and second planes intersect with a non-zero angle; and a concave power antenna assembly having a concave shape facing and positioned below the concave ferrite layer, the concave power antenna assembly comprising a first power antenna portion having a third surface that defines a third plane and a second power antenna portion having a fourth surface that defines a fourth plane, wherein the third and fourth planes intersect with the non-zero angle, and configured to receive wireless power and to charge a battery based on the received wireless power, the shielding layer configured to shield components other than the ferrite layer and the power antenna assembly from the wireless field of the transmit antenna.
28. A method of charging a battery, the method comprising: shielding components other than a concave ferrite layer assembly and a concave power antenna assembly from a wireless field, generated by a transmit antenna, using a shielding layer having a concave shape facing and positioned below the non-planar mounting surface, the ferrite layer comprising at least a first ferrite portion having a first surface that defines a first plane and a second ferrite portion having a second surface that defines a second plane that is not coplanar with the first plane, wherein the first and second planes intersect with a non-zero angle, the power antenna assembly comprising a first power antenna portion having a third surface that defines a third plane and a second power antenna portion having a fourth surface that defines a fourth plane, wherein the third and fourth planes intersect with the non-zero angle; altering the wireless field using the concave ferrite layer having a concave shape facing and positioned below the shielding layer; and receiving wireless power from the wireless field using the concave power antenna assembly having a concave shape facing and positioned below the ferrite layer, the power antenna assembly configured to provide power to charge the battery.
33. A device for receiving wireless power, the device comprising: means for shielding an electric vehicle from a wireless field, generated by a transmit antenna, having a concave shape facing and positioned below a non-planar mounting surface; means for altering the wireless field having a concave shape facing and positioned below the means for shielding, the means for altering comprising at least a first ferrite portion having a first surface that defines a first plane and a second ferrite portion having a second surface that defines a second plane that is not coplanar with the first plane, wherein the first and second planes intersect with a non-zero angle; and means for receiving wireless power from the wireless field having a concave shape facing and positioned below the means for altering, the means for receiving comprising a first portion having a first surface that defines a third plane and a second portion having a second surface that defines a fourth plane, wherein the third and fourth planes meet at the non-zero angle, and configured to charge a battery based on the received wireless power, the means for shielding configured to shield components other than the means for altering the wireless field and the means for receiving wireless power from the wireless field of the transmit antenna.