无线充电设备金属外壳优化方案及其仿真分析
首发时间:2018-10-30
摘要:当无线充电设备的电能传输路径上存在非铁磁性金属外壳,线圈自感及线圈间互感会降低,金属内部产生涡流,降低系统性能并且造成安全性问题。为了解决这个问题,本文提出一种断开式切割的外壳改造方案,使线圈间互感大于无外壳情况,同时在切割处进行铁氧体补偿来维持自感大小。首先从涡流效应和磁效应两个角度分析金属对系统参数的影响,然后设计了不同的切割优化及铁氧体补偿方案。仿真结果表明,与无切割相比,断开式切割及一定程度的铁氧体补偿能使线圈自感维持在无金属外壳状态,互感变大,涡流损耗忽略不计,验证了此联合补偿方案的可行性。
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Optimization scheme of metal casing of wireless charging equipment and its simulation analysis
Abstract:When there is a non-ferromagnetic metal casing on the power transmission path of the wireless charging device, the self-inductance of the coil and the mutual inductance between the coils are reduced, and eddy current is generated inside the metal, which reduces system performance and causes safety problems.In order to solve this problem, this paper proposes a broken-cut remodeling scheme for the casing, which makes the mutual inductance between the coils larger than that without the casing, and at the same time, ferrite compensation is performed at the cutting position to maintain the self-inductance.Firstly, the influence of metal on system parameters is analyzed from the two aspects of eddy current effect and magnetic effect. Then different cutting optimization and ferrite compensation scheme are designed.The simulation results show that compared with no-cutting, the broken cutting and ferrite compensation can maintain the self-inductance of the coil, the mutual inductance becomes larger, the eddy current loss is negligible, and the feasibility of the joint compensation scheme is verified.
Keywords: Eddy current effect Magnetic effect broken cutting ferrite compensation
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