电动汽车无线电力传输对儿童和成人电磁辐射的比较

Comparison of electromagnetic exposure to child and adult from electric vehicle wireless power transmission

为研究儿童乘客与成人乘客之间的电磁辐射差异,以验证儿童乘客的安全性,在85 kHz的工作频率下计算出儿童乘客身体的介电参数,使用有限元模拟软件COMSOL Multiphysics建立了电动汽车模型、充电线圈模型、儿童乘客模型和成人乘客模型。当儿童乘客和成人乘客分别坐在汽车的4个不同位置时,分析在身体和头部产生的磁感应强度和感应电场强度的分布,以及儿童和成人的大脑电磁暴露值之间的差异,并将其与设定限值进行了比较。实验结果表明当乘客在副驾驶位置时,受到的电磁暴露最大。同一位置儿童的电磁暴露水平略高于成年人,并且两者的磁感应强度和感应电场强度均远小于设定的公共电磁暴露推荐值。

It is important to verify the safety of electric vehicle(EV)wireless power transmission for child passengers by studying the electromagnetic exposure difference between the child passengers and the adult passengers.The dielectric parameters of the child passengers’body were calculated under the operating frequency of 85 kHz.Using the finite element simulation software COMSOL Multiphysics,a model was established for the child passengers and adult passengers when the EVs charged by the wireless charging coil.This paper analyzed the distribution of magnetic induction intensity and induced electric field intensity generated on the body and head when the child passengers and adult passengers sat in four different positions.Additionally,the difference between the brain electromagnetic exposure values of children and adults was analyzed and compared with the limits set.The results showed that the electromagnetic exposure was the largest when the passenger sat in the co-driver position.The electromagnetic exposure level of child was slightly higher than that of adult at the same position,and the magnetic induction intensity and induced electric field intensity of both were much smaller than the public electromagnetic exposure recommendation values.