Wireless charging coil placement for reduced field exposure
First Claim
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1. An apparatus, comprising:
- a plurality of power transmit unit coils, wherein a power transmit unit coil includes a set of main windings, positioned at a first location on a structure, to carry a first current in a first direction, wherein the first current is to cause an electromagnetic field to emanate from the power transmit unit coil, wherein the first location enables a maximum inter-coil magnetic field between the power transmit unit coil and another power transmit unit coil that is less than a magnetic field limit; and
an active shielding coil, positioned at a second location on the structure, to carry a second current in a direction substantially opposite the first direction wherein the second current is to cause a reduction of the size of the electromagnetic field in a region between the power transmit unit coil and another power transmit unit coil of the plurality of power transmit unit coils, wherein the first location and the second location are dictated by an exponential decay model of the electromagnetic field.
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Abstract
An apparatus is described herein. The apparatus includes a power transmit unit coil and an active shielding coil. The power transmit unit coil includes a set of main windings, positioned at a first location on a structure, to carry a first current in a first direction, wherein the first current is to cause an electromagnetic field to emanate from the power transmit unit coil. The active shielding coil is positioned at a second location on the structure and is to carry a second current in a direction substantially opposite the first direction wherein the second current is to cause a reduction of the size of the electromagnetic field.
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Citations
19 Claims
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1. An apparatus, comprising:
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a plurality of power transmit unit coils, wherein a power transmit unit coil includes a set of main windings, positioned at a first location on a structure, to carry a first current in a first direction, wherein the first current is to cause an electromagnetic field to emanate from the power transmit unit coil, wherein the first location enables a maximum inter-coil magnetic field between the power transmit unit coil and another power transmit unit coil that is less than a magnetic field limit; and an active shielding coil, positioned at a second location on the structure, to carry a second current in a direction substantially opposite the first direction wherein the second current is to cause a reduction of the size of the electromagnetic field in a region between the power transmit unit coil and another power transmit unit coil of the plurality of power transmit unit coils, wherein the first location and the second location are dictated by an exponential decay model of the electromagnetic field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system, comprising:
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a power transmit unit coil comprising a set of main windings, positioned at a first location on a structure, to carry a first current in a first direction, wherein the first location enables a maximum inter-coil magnetic field between all the power transmit unit coil and another power transmit unit coil that is less than a magnetic field limit; an active shielding coil, positioned at a second location on the structure, to carry a second current in a direction substantially opposite, the first direction, wherein the second current is to cause a reduction of the size of the electromagnetic field in a region between the power transmit unit coil and the another power transmit unit coil of a plurality of power transmit unit coils, wherein the first location and the second location are dictated by an exponential decay model of the electromagnetic field; and electronic circuitry that is to drive current into the power transmit unit coil, the another power transmit unit coil, and the active shielding coil to create a resonant inductive coupling with a power receive unit. - View Dependent Claims (11, 12, 13, 14)
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15. A method for coil placement, comprising:
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positioning a power transmit unit coil of a plurality of power transmit unit coils in a structure to minimize exposure to magnetic fields at a first position that is determined via an exponential decay model of a potential magnetic field; determining a maximum inter-coil magnetic field of each coil of the plurality of power transmit unit coils; calculating an error based on the potential magnetic, field of the power transmit unit coil and the maximum inter-coil magnetic field of the power transmit unit coil and another power transmit unit coil; and re-positioning the power transmit unit in response to the error being greater than a pre-defined threshold. - View Dependent Claims (16, 17, 18, 19)
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Specification