A multi-target parallel wireless energy transmission method and device for frequency division multiple access

Abstract

The invention discloses a frequency division multiple access multi-target parallel wireless energy transmission method and a device thereof. The method comprises the steps of successively transmittingsingle-frequency charging request signals with frequency of f1-fM by M energy receiving targets to a time reversal mirror (TRM) which is composed of N TR antennae, and correspondingly the TRM can record M sets of acquiring signals; then performing time reversal processing (simplified to phase conjugation for realizing on the condition of single frequency) on M sets of TRM acquiring signals with frequency of f1-fM, thereby obtaining M sets of TRM returning signals; and finally, combining the M sets of TRM returning signals for obtaining one set of multi-frequency TRM energy transmission signals, and radiating the signal out by the TRM, namely generating a multi-point TR focusing field by means of a plurality of point frequencies, and simultaneously transmitting energy to the M energy receiving targets. The method and the device according to the invention can enable each energy receiving target occupy one independent energy transmission frequency point, thereby successfully setting a problem of parallel energy transmission to a plurality of users without mutual interference.

Description

technical field [0001] The method relates to wireless energy transmission technology, in particular to a frequency division multiple access multi-target parallel wireless energy transmission method and device. Background technique [0002] Wireless energy transmission is a research frontier in the field of energy transmission, and has attracted much attention from the scientific and industrial circles in recent years. Existing wireless energy transmission technologies mainly include electromagnetic induction energy transmission, electromagnetic resonance energy transmission and electromagnetic wave energy transmission. [0003] Both electromagnetic induction and electromagnetic resonance energy transmission technologies exchange wireless energy through the transceiver coil. The transmission distance is generally smaller than the diameter of the coil and is only suitable for short-distance charging. The main applications are charging pads for mobile phones, MP3 and other mobi...

AI Technical Summary

Problems solved by technology

However, none of the above-mentioned TR energy transmission schemes pointed out how to solve the problem of multi-target energy transmission, especially the problem of multi-target parallel energy transmission for charging multiple users at the same time

[0007] An invention patent with application number 201710058090.3 discloses an indoor wireless energy transmission system and a wireless energy transmission method. The power transmission array composed of antennas, single-frequency operation, multi-target beam optimization time is long, serious interference to non-rechargeable devices, and it is difficult to guarantee the safety of humans, animals, plants and non-rechargeable devices in the energy transmission space

However, the energy transmission request signal in this patent is a broadband signal, which requires complex and time-consuming Fourier transform and time inversion combined operations in the broadband to obtain the broadband excitation signal of the power transmitting array

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