A multi-target selective wireless energy transmission method and device based on focused waves

Abstract

The invention discloses a focusing wave-based multi-target selective wireless energy transfer method and device. The method comprises the steps that postback signals acquired by a TRM are subjected tolinear superimposing according to a certain superimposing coefficient, and then a final synthesized TRM excitation signal can be obtained; and the excitation signal is fed into various array elementsof the TRM, and then a needed TR multi-point focusing field can be generated, wherein electromagnetic energy transferred by the focusing field is only focused at to-be-charged targets and is not focused at the positions of other non-authorized charged targets. In addition, the energy flow size of the areas outside the charged targets can be suppressed through an optimization algorithm. Accordingto the method, the formed TR multi-point focusing field can distribute wireless energy to the multiple to-be-charged targets according to the needed proportion in a space point focusing mode, preventthe condition that the wireless energy is stolen by the other non-authorized targets and effectively solve the problem of multi-target selective wireless energy transfer in an indoor environment, a semi-open environment, a closed cabin environment and the like and the human body electromagnetic radiation safety and electromagnetic interference problems.

Description

technical field [0001] The method relates to wireless energy transmission technology, in particular to a multi-target selective wireless energy transmission method and device based on electromagnetic focused waves. Background technique [0002] With the rapid development of Internet of Things applications, the energy consumption of wireless sensor networks and mobile devices is very serious. Power transfer using wireless energy is a potential solution to this problem. Existing wireless energy transfer technologies are generally performed through coils or directional antennas, and can only be applied to point-to-point specific scenarios. However, in the application of the Internet of Things, there may be multiple devices with different power levels that need to be charged. How to distribute wireless energy to multiple designated energy-receiving targets according to the required ratio is an important challenge in the field of wireless energy transmission. [0003] Time reve...

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Problems solved by technology

Another example is the invention patent with application number 201010568332.1, which discloses a wireless sensor network node wireless charging system and method based on time reversal. Pulse transmission energy has defects such as unstable energy transmission and difficulties in the physical realization of TR

[0004] For this reason, in 2016, inventors Li Tao, Zhao Deshuang, Guo Fei and others submitted an invention patent with the application number 201611006929.0, which disclosed a microwave narrowband wireless energy transmission method and device based on focused waves. Single-frequency signals replace short pulses for TR energy transmission, which successfully makes TR energy transmission continuous, stable and easy to implement. However, this patent only solves the problem of single-target wireless energy transmission, and does not provide for multi-target selective energy transmission. solution

[0005] 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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