Design of an EMF Suppressing Magnetic Shield for a 100-kW DD-Coil Wireless Charging System for Electric Vehicles
Design of an EMF Suppressing Magnetic Shield for a 100-kW DD-Coil Wireless Charging System for Electric Vehicles
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DOI：
10.1109/apec.2019.8722084
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发表时间：
2019-03
期刊：
影响因子：
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通讯作者：
Mostak Mohammad;J. Pries;O. Onar;V. Galigekere;G. Su;Saeed Anwar;Jonathan Wilkins;Utkarsh D. Kavimandan;Devendra Patil
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文献类型：
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作者：
Mostak Mohammad;J. Pries;O. Onar;V. Galigekere;G. Su;Saeed Anwar;Jonathan Wilkins;Utkarsh D. Kavimandan;Devendra Patil
本研究调查了100 kW双D（DD）无线充电系统（WCS）的电磁场（EMF）发射。提出了一种屏蔽技术，以抑制磁场辐射低于国际非电离辐射防护委员会（ICNIRP）规定的限制。DD线圈产生的泄漏模式不同于单极（圆形、矩形等）衬垫和传统的基于涡流的铝屏蔽在抑制该泄漏场方面是无效的。因此，有条不紊地设计的磁屏蔽可能会更有效。本研究提出了一种屏蔽技术的DD线圈使用铝屏蔽和低磁阻磁屏蔽的组合，以抑制磁场发射。通过有限元分析（FEA）模型和实验测试的屏蔽效果进行评估。提出的磁屏蔽的有效性和传统的铝屏蔽的限制进行了研究。一个原型11千瓦DD线圈无线充电系统被用来实验验证所提出的屏蔽技术。实验结果表明，铝屏蔽的DD线圈的发射增加了25%，建议的磁屏蔽可以被用来抑制60%的发射。
This study investigates the electromagnetic field (EMF) emissions of a 100-kW Double-D (DD) wireless charging system (WCS). A shielding technique is proposed to suppress the magnetic field emissions below the limits set by the International Commission on Non-Ionizing Radiation Protection (ICNIRP). The leakage pattern produced by the DD coil is different than unipolar (circular, rectangular, etc.) pads and traditional eddy current based aluminum shields are not effective at suppressing this leakage field. Therefore, a methodically designed magnetic shield could be more effective. This study proposes a shielding technique for DD coils using a combination of aluminum shielding and a low reluctance magnetic shield to suppress the magnetic field emissions. The shielding effectiveness is evaluated through finite element analysis (FEA) models and tested experimentally. The effectiveness of the proposed magnetic shielding and the limits of the conventional aluminum shielding are studied. A prototype 11-kW DD coil wireless charging system is used to experimentally validate the proposed shielding technique. The experimental results show that the aluminum shield increases the emissions of DD coils by 25% and the proposed magnetic shield can be employed to suppress the emission by 60%.