Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 35, Issue 9, Pages 9034-9045Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2020.2971967
Keywords
DD coil; EMF emissions; misalignment tolerance; wireless electric vehicle charging
Categories
Funding
- National Natural Science Foundation of China [51677032, 51977043]
- Natural Science Foundation of Heilongjiang Province [E2017045]
- Harbin Science and Technology Innovation Talents Special Fund Project [2016RAQXJ002]
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In this article, a design method of the double-D (DD) coil aiming at high misalignment tolerance is proposed, and the electromagnetic field (EMF) shielding of the system is considered. Inspired by the DD coil recommended in the standard J2954 published by the Society of Automotive Engineers, the novel structures of the transmitting (Tx) coil and the receiving (Rx) coil are designed, respectively. First, the standard DD coil is introduced as a reference. Second, for the Tx coil, the parameters, such as length, width, and coverage, are investigated in detail. For the Rx coil, the coil structure overlapped in the edge is optimized. The purpose is to obtain a higher coupling coefficient at the maximum offset. Third, considering EMF emissions exceeding the limit, the structure of the central-depressed coil with E-shaped cores is proposed in the Tx coil. The EMF emissions can be reduced to less than 27 mu T at the rated output power. Finally, a 6.6-kW experimental system of which the maximum transmission efficiency is higher than 94% is set up. The experimental results prove that the proposed structure is beneficial to maintain a higher coupling coefficient against misalignment and suppress EMF emissions.
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