Analysis and Introduction of Effective Permeability with Additional Air-Gaps on Wireless Power Transfer Coils for Electric Vehicle Based on SAE J2954 Recommended Practice

Dongwook Kim, Hongseok Kim, Anfeng Huang, Qiusen He, Hanyu Zhang, Seungyoung Ahn, Yuyu Zhu and Jun Fan
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Dongwook Kim: Graduate School for Green Transportation, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
Hongseok Kim: Electromagnetic Compatibility Laboratory, Missouri University of Science and Technology, Rolla, MO 65401, USA
Anfeng Huang: Electromagnetic Compatibility Laboratory, Missouri University of Science and Technology, Rolla, MO 65401, USA
Qiusen He: Electromagnetic Compatibility Research Center, Southwest University of Science and Technology, Mianyang 621010, China
Hanyu Zhang: Electromagnetic Compatibility Research Center, Southwest University of Science and Technology, Mianyang 621010, China
Seungyoung Ahn: Graduate School for Green Transportation, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
Yuyu Zhu: Electromagnetic Compatibility Research Center, Southwest University of Science and Technology, Mianyang 621010, China
Jun Fan: Electromagnetic Compatibility Laboratory, Missouri University of Science and Technology, Rolla, MO 65401, USA

Energies, 2019, vol. 12, issue 24, 1-11

Abstract: The wireless power transfer (WPT) method for electric vehicles (EVs) is becoming more popular, and to ensure the interoperability of WPT systems, the Society of Automotive Engineers (SAE) established the J2954 recommended practice (RP). It includes powering frequency, electrical parameters, specifications, testing procedures, and other contents for EV WPT. Specifically, it describes the ranges of self-inductances of the transmitting coil, the receiving coil, and coupling coefficient ( k ), as well as the impedance matching values of the WPT system. Following the electrical parameters listed in SAE J2954 RP is crucial to ensure the EV wireless charging system is interoperable. This paper introduces a method for adjusting the effective permeability of the ferrite blocks in the standard model, to tune the self-inductance of the coils as well as the coupling coefficient. To guarantee the given values of the self-inductance of the coil and coupling coefficient matched those in the standard, we slightly modified the air-gap between the ferrite tiles in a specific region. Based on this method, it was possible to successfully tune the self-inductance of the transmitting coil and receiving coil as well as the coupling coefficient. The proposed method was verified by simulation and experimental measurements.

Keywords: SAE J2954 RP; wireless power transfer (WPT); electric vehicles (EVs); effective permeability; ferrite block (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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