基于波束成形的无线充电过程性能评估
电子设计工程Electronic Design Engineering 第27卷Vol.27第1期No.12019年1月Jan.2019
收稿日期：2018-03-14稿件编号：201803114基金项目：重点国别及机构产业技术合作项目（BZ2017007）
作者简介：俞玲娜（1992—），女，江苏无锡人，硕士研究生。研究方向：无线电能传输。无线充电技术（Wireless charging technology ）成
为一种必然趋势已被业内广泛认同[1]。其是在不借
助金属导线以及其他物理连接的条件下，基于电磁
感应或其他交流感应理论，在发射端和接收端之间
实现电能传输的技术[2]。
“波束成形（Beamforming ）”技术是无线充电技术领域的研究热点之一。美国麻省理工大学研发的Mag-MIMO （Magnetic-MIMO ）无线充电系统首次将波束成形技术应用于无线充电领域[3]。基于该技术的无线充电系统，使得原本全向传输的能量集中传输至某个或某些特定方向。这将有助于延长充电距基于波束成形的无线充电过程性能评估
俞玲娜1，郝鹏2，刘维亭1
（1.江苏科技大学电子信息学院，江苏镇江212003；2.镇江博联电子科技有限公司江苏镇江212003）摘要：波束成形技术可改善无线充电的传输效率和传输距离等性能。然而，考虑到充电过程中发射端设备与接收端设备之间可能的相对位移对波束成形的影响，甚至可能导致的充电中断，文中针对一对一动态无线充电场景，建立了基于波束成形的充电过程数学模型。该模型考察6个环节概率，即广播→扫描→连接→读写数据→充电→充电完成判断，并进而提出了一种基于离散时间马尔科夫链的无线充电系统性能评估方法。仿真结果表明，具有波束成形机制的无线充电过程比一般的无线充电在充电成功率上提高了37%。
关键词：无线充电；波束成形；马尔科夫链；性能评估
中图分类号：TM743文献标识码：A 文章编号：1674-6236（2019）01-0058-05
Performance evaluation of single?input?single?output wirelesspower transfer
based on beamforming
YU Ling?na 1，HAO Peng 2，LIU Wei?ting 1
（1.School of Electronics and Information ，Jiangsu University of Science and Technology ，Zhenjiang
212003，China ；2.Zhenjiang Big-Link Technology Co.，Ltd.，Zhenjiang 212003，China ）
Abstract:Extensive investigations show that wireless charging system using beam-forming can improve the transmission efficiency and reliability and reach longer distance.However ，beam-forming also increases the complexity of the charging process ，problems such as relative movement between the transmitter and receiver during charging may affect beam-forming process or even lead to charging interruption.Considering such situation ，a studying model of single-input-single-output wireless charging system with beam-forming is established in this paper.This model includes six steps ，i.e.，broadcasting ，scanning ，connecting ，reading &writing data ，charging and final https://www.360docs.net/doc/d515970050.html,pared to the existing studies ，it hassupplemented two additional steps i.e.，scanning and final judgment ，and examined the probabilities of all steps.Therefore ，the model of charging process and the theoretical performance evaluation proposed in the article also have taken following effects into consideration ，such as the regional characteristics of beam-forming ，relative movement between mobile devices ，unexpected interruption in charging process.In the end ，the simulation results show that the efficiency of wireless charging with beam-forming is 37%higher than that of the normal system.Key words:wireless charging ；beamforming ；markov chain ；performance evaluation
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