Single-structure wireless charging receiver systems having multiple receiver coils
First Claim
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1. A wireless charging receiver system, comprising:
- a primary coil formed of a plurality of turns of stranded wire wound about a primary axis and configured to receive wireless power from time-varying magnetic fields generated at a first frequency and in a first direction;
a ferromagnetic shield disposed over at least two adjacent surfaces of the primary coil and over a portion of entire circumference of the at least two adjacent surfaces such that an annular segment of the primary coil is uncovered by the ferromagnetic shield; and
a secondary coil formed of a plurality of turns of stranded wire wound about a secondary axis disposed along a circumference centered around the primary axis, the secondary coil covers overlapping portions of the ferromagnetic shield and the primary coil and is configured to receive wireless power from time-varying magnetic fields generated at a second frequency different from the first frequency and in a second direction different from the first direction.
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Abstract
Embodiments disclosed herein describe a wireless power receiving system for an electronic device includes: a first inductor coil configured to receive power primarily at a first frequency and from magnetic fields propagating in a first direction; and a second inductor coil configured to receive power primarily at a second frequency and from magnetic fields propagating in a second direction, wherein the first frequency is different than the second frequency.
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Citations
20 Claims
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1. A wireless charging receiver system, comprising:
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a primary coil formed of a plurality of turns of stranded wire wound about a primary axis and configured to receive wireless power from time-varying magnetic fields generated at a first frequency and in a first direction; a ferromagnetic shield disposed over at least two adjacent surfaces of the primary coil and over a portion of entire circumference of the at least two adjacent surfaces such that an annular segment of the primary coil is uncovered by the ferromagnetic shield; and a secondary coil formed of a plurality of turns of stranded wire wound about a secondary axis disposed along a circumference centered around the primary axis, the secondary coil covers overlapping portions of the ferromagnetic shield and the primary coil and is configured to receive wireless power from time-varying magnetic fields generated at a second frequency different from the first frequency and in a second direction different from the first direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A portable electronic device, comprising:
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a housing comprising a top portion and a bottom portion configured to mate with the top portion to form an internal cavity; and a wireless charging receiver system configured to receive power from time-varying magnetic fields propagating through the bottom portion of the housing, the wireless charging receiver system comprising; a primary coil formed of a plurality of turns of stranded wire wound about a primary axis and configured to receive wireless power from time-varying magnetic fields generated at a first frequency and in a first direction; a ferromagnetic shield disposed over at least two adjacent surfaces of the primary coil and over a portion of the entire circumference of the at least two adjacent surfaces such that an annular segment of the primary coil is uncovered by the ferromagnetic shield; and a secondary coil formed of a plurality of turns of stranded wire wound about a secondary axis disposed along a circumference centered around the primary axis, the secondary coil covers overlapping portions of the ferromagnetic shield and the primary coil and is configured to receive wireless power from time-varying magnetic fields generated at a second frequency different from the first frequency and in a second direction different from the first direction. - View Dependent Claims (12, 13, 14, 15)
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16. A wireless charging system, comprising:
a wireless charging transmitter comprising; a housing having a charging surface; and at least one transmitter coil formed of a plurality of turns of stranded wire disposed within the housing and below the charging surface, the at least one transmitter coil configured to generate time-varying magnetic fields through and above the charging surface; and a wireless charging receiver comprising; a primary coil formed of a plurality of turns of stranded wire wound about a primary axis and configured to receive wireless power from time-varying magnetic fields generated at a first frequency and in a first direction; a ferromagnetic shield disposed over at least two adjacent surfaces of the primary coil and over a portion of the entire circumference of the at least two adjacent surfaces such that an annular segment of the primary coil is uncovered by the ferromagnetic shield; and a secondary coil formed of a plurality of turns of stranded wire wound about a secondary axis disposed along a circumference centered around the primary axis, the secondary coil covers overlapping portions of the ferromagnetic shield and the primary coil and is configured to receive wireless power from time-varying magnetic fields generated at a second frequency different from the first frequency and in a second direction different from the first direction. - View Dependent Claims (17, 18, 19, 20)
Specification