Resonant-cavity wireless power transfer hardware.
An embodiment provides a method of wireless power transmission, including: powering a transmitter that produces electromagnetic waves in a three dimensional structure; selecting a transmission frequency that is a resonance frequency for the three dimensional structure; and transmitting, using the transmitter, electromagnetic waves within the three dimensional structure on the transmission frequency selected. Other systems, methods, apparatuses and products are described and claimed.
FIELD(1) The subject matter described herein generally relates to wireless power transfer.BACKGROUND(2) Wireless power transfer (WPT) includes wireless techniques for charging of battery powered devices. This wireless charging operates using close proximity between the charging source and the device to be charged. For example, WPT technologies such as near-field manetoquasistatic (MQS) WPT and inductive charging are capable of charging a device (e.g., one or two devices) by bringing the device into close proximity with a charging source. This wireless charging technique commonly includes inducing a current in the device to be charged by placing it on or in close proximity with the power source. Common examples include charging an electric toothbrush in a charging stand, using a power transfer mat upon which a mobile device is laid, etc.(3) WPT also includes a power source providing a small amount of power for certain device devices at a distance. For example, broadcast far-field WPT is capable of transferring power at greater distances, e.g., to a radio frequency identification (RFID) tag. However, this broadcast technique is not efficient in that commonly less than 0.1% of the source power is provided to the target device. Moreover, regulations often (which vary by jurisdiction) limit the amount of power transferred using such techniques to approximately 100 uW. While point-to-point far-field WPT systems maintain higher end-to-end efficiency, these techniques require complex
1. A method of wireless power transmission, the method comprising: powering a first transmitter that produces electromagnetic waves in a three dimensional structure, wherein the three dimensional structure comprises a cavity space allowing for placement of objects having power receivers within the cavity space; selecting a transmission frequency that is a first resonance frequency of the cavity space within the three dimensional structure; and stimulating the first transmitter at the first resonance frequency of the cavity space within the three dimensional structure to generate electromagnetic waves within the three dimensional structure, wherein the electromagnetic waves transmit power to a receiver located within the three dimensional structure.
10. An apparatus for wireless power transmission, the apparatus comprising: a power source; and a first transmitter operatively coupled to the power source, the first transmitter being placed in a three dimensional structure comprising a cavity space allowing for placement of objects having power receivers within the cavity space, and first the transmitter being stimulated to produce electromagnetic waves within the three dimensional structure, wherein the produced electromagnetic waves transmit power to a receiver located within the three dimensional structure, and wherein the first transmitter transmits is stimulated at a first transmission frequency that is a resonance frequency of the cavity space within the three dimensional structure.
15. A system for wireless power transmission, the system comprising: a three dimensional structure; a first transmitter placed in the three dimensional structure, wherein the three dimensional structure comprises a cavity space allowing for placement of objects having power receivers within the cavity space; and a power source that powers the first transmitter to produce electromagnetic waves in the three dimensional structure, wherein the produced electromagnetic waves transmit power to a receiver located within the three dimensional structure, and wherein the first transmitter is stimulated at a first transmission frequency that is a resonance frequency of the cavity space within the three dimensional structure.
20. An apparatus receiving wireless power, the apparatus comprising: a processor; a memory storing instructions that are executable by the processor; and a receiver that is coupled to the processor and coupled to an object, the receiver being tuned to receive wireless power transmitted at a resonance frequency of a cavity space within a three dimensional structure, wherein the three dimensional structure comprises the cavity space allowing for placement of the object having the coupled receiver within the cavity space.