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- Title
Research on Offset Characteristics of Three Coupling Coils in Wireless Charging System.
- Authors
LI Mingyang; NIU Pingjuan; LI Yuhong; LI Ying; SUI Yu
- Abstract
The offset characteristics of transmitting and receiving coils manufactured by different wireless electric vehicle manufacturers are a critical issue to ensure the interconnection of domestic and international vehicle charging. The 3.7 kW wireless energy transmission system was modeled and the SS-type topology of wireless charging was derived to obtained the expressions for output power and energy transfer efficiency. The study of the offset charateristics was also conducted for the mutual inductance between square-circular coils, and the expressions for the mutual inductance coefficient were theoretically introduced for the lateral offset performed when the coils were parallel, and then the effect of offset distance on the transmission characteristics was derived. The finite element simulation model was established to compare the changes of transmission characteristics of circle-square, DD-square and DD-circle coils within a certain offset distance, and an experimental platform was built to verify the results, which show that the anti-offset characteristics between circle-square coils are the strongest, and the offset effects on coupling coefficient, energy transfer efficiency and output power within a certain range are close to those of square-square coils. DD-circle and DD-square coil combinations have better transmission characteristics when the DD coils are offset in the non-central direction than when they are square, and the transmission characteristics are both improved, and very poor in the central direction. This study provides a reference for efficient charging between different coils.
- Subjects
WIRELESS power transmission; ELECTRIC coils; ELECTRIC network topology; ELECTRIC inductance; MUTUAL inductance
- Publication
Electric Drive, 2022, Vol 52, Issue 21, p8
- ISSN
1001-2095
- Publication type
Article
- DOI
10.19457/j.1001-2095.dqcd23003