Method and apparatus for wireless power transmission
First Claim
1. An RF coil configuration for producing a magnetic field, comprising:
- a planar spiral inductor, wherein the width of the planar spiral inductor'"'"'s trace becomes wider as the trace spirals toward the center of the planar spiral inductor, wherein the widening of the trace as the trace spirals toward the center of the planar spiral inductor provides a more even magnetic field distribution.
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Abstract
Embodiments of the invention relate to a method and system for transferring power wirelessly to electronic devices. The system can utilize magnetic coupling between two coils at close proximity to transfer sufficient power to charge an electronic device. Embodiments of the invention pertain to an array of spiral coils that can be used to transmit power for transfer to receiver coils. Potential applications of this technology include charging consumer electronic devices (cell phones, laptops, PDAs, etc), developing hermetically sealed devices for extreme environments, and less invasive transcutaneous energy transfer (TET) systems. Various embodiments of the subject system can be referred to as PowerPad system. Embodiments can incorporate one or more of the following: planar inductors, PCB transformers, and very high frequency power supplies. Embodiments of the invention also pertain to planar inductors having characteristics that allow the production of even magnetic field, as well as systems that incorporate such planar inductors.
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Citations
20 Claims
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1. An RF coil configuration for producing a magnetic field, comprising:
a planar spiral inductor, wherein the width of the planar spiral inductor'"'"'s trace becomes wider as the trace spirals toward the center of the planar spiral inductor, wherein the widening of the trace as the trace spirals toward the center of the planar spiral inductor provides a more even magnetic field distribution. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for providing power to one or more devices, comprising:
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a base station, wherein the base station comprises; a planar spiral inductor, wherein the width of the planar spiral inductor'"'"'s trace becomes wider as the trace spirals toward the center of the planar spiral inductor, wherein the widening of the trace as the trace spirals toward the center of the planar spiral inductor provides a more even magnetic field distribution; and a power supply to drive the planar spiral coil such that a magnetic field is produced; and one or more devices, wherein each of the one or more devices comprises a receiver, wherein the receiver inductively couples the magnetic field produced by the planar spiral coil when the receiver is positioned proximate the planar spiral coil so as to provide power to the device. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method of providing power to one or more devices, comprising:
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providing a base station, wherein the base station comprises a planar spiral inductor, wherein the width of the planar spiral inductor'"'"'s trace becomes wider as the trace spirals toward the center of the planar spiral inductor, wherein the widening of the trace as the trace spirals toward the center of the planar spiral inductor provides a more even magnetic field distribution and a power supply to drive the planar spiral coil such that a magnetic field is produced; positioning one or more devices, wherein each of the one or more devices comprises a receiver, wherein the receiver couples the magnetic field from the planar spiral coil when the receiver is positioned proximate the planar spiral coil so as to provide power to the device. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification