摘要
目前大多数对于无线充电电磁环境安全的研究都局限在电动汽车磁共振式无线充电,然而电磁感应式无线充电装置更接近人体,使用时间更长,本文针对电磁感应式无线充电导体异物易感应出涡流引起发热以及人体电磁辐射问题进行了仿真研究.无线充电系统结构参考Qi标准,首先利用参数电路对负载电阻、线圈间距及偏移距离对传输效率和输出功率的影响进行仿真;随后使用确定的参数仿真研究不同材质的导体异物在30 min内的温升.仿真结果表明:当导体异物正对线圈时温升明显,金银等材料的温度均可达100°C以上;当导体异物不正对线圈时,温升在可接受范围内.最后使用CST仿真得到电磁场强度、人体温度以及CEM43°C热剂量值,以此来体现电磁感应式无线充电对人体电磁辐射的非热效应及热效应,电场最大值0.6427 V/m,磁场最大值2.6940 A/m,人体大脑温度最高37.3°C,CEM43°C热剂量值0.0095,结果基本在正常参考值范围内.本文研究有利于电磁感应式无线充电装置的推广应用.
At present,most of the research on the electromagnetic environment safety of wireless charging is limited to the magnetic resonance wireless charging of electric vehicles.However,the electromagnetic induction wireless charging device is closer to the human body and has a longer use time.This article focuses on the electromagnetic induction wireless charging conductor that easily induces foreign objects.The eddy current causes heat generation and human body electromagnetic radiation problems were simulated.The structure of the wireless charging system refers to the Qi standard.First,the influence of load resistance,coil spacing,and offset distance on the transmission efficiency and output power is simulated by the parameter circuit.Then,using the determined parameters,the temperature rise of the conductor foreign bodies of different materials within 30 minutes is studied.The simulation results show that when the conductor foreign bodies are facing the coil,the temperature rise is obvious,and the temperature of gold and silver and other materials can reach more than 100°C.When the foreign body is not facing the coil,the temperature rise is within the acceptable range.Finally,use CST simulation to obtain the electromagnetic field intensity,human body temperature and CEM43°C thermal has value to reflect the non-thermal and thermal effects of electromagnetic induction wireless charging on human electromagnetic radiation.The maximum electric field is 0.6427 V/m and the maximum magnetic field is 2.6940 A/m,the maximum temperature of the human brain is 37.3°C,the thermal dose of CEM43°C is 0.0095,the result is basically within the normal reference value range.This research is conducive to the popularization and application of electromagnetic induction wireless charging devices.
作者
魏岳锐
董亮
杨威
唐银池
邹晓伟
WEI Yuerui;DONG Liang;YANG Wei;TANG Yinchi;ZOU Xiaowei(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China;Technical Development Department,CRRC Dalian Locomotive Co.,Ltd.,Dalian 116022,China)
出处
《电波科学学报》
CSCD
北大核心
2021年第5期653-660,共8页
Chinese Journal of Radio Science
基金
国家自然科学基金(U1834203)。
关键词
无线充电
Qi标准
涡流发热
电磁辐射
CST
wireless charging
Qi standard
eddy current heating
electromagnetic radiation
CST
