An Autonomous Coil Alignment System for the Dynamic Wireless Charging of Electric Vehicles to Minimize Lateral Misalignment

Karam Hwang, Jaeyong Cho, Dongwook Kim, Jaehyoung Park, Jong Hwa Kwon, Sang Il Kwak, Hyun Ho Park and Seungyoung Ahn
Additional contact information
Karam Hwang: Graduate School for Green Transportation, KAIST, Daejeon 34141, Korea
Jaeyong Cho: Graduate School for Green Transportation, KAIST, Daejeon 34141, Korea
Dongwook Kim: Graduate School for Green Transportation, KAIST, Daejeon 34141, Korea
Jaehyoung Park: Graduate School for Green Transportation, KAIST, Daejeon 34141, Korea
Jong Hwa Kwon: Electromagnetic Environment Research, ETRI, Daejeon 34129, Korea
Sang Il Kwak: Electromagnetic Environment Research, ETRI, Daejeon 34129, Korea
Hyun Ho Park: Department of Electronic Engineering, University of Suwon, Hwaseong 18123, Korea
Seungyoung Ahn: Graduate School for Green Transportation, KAIST, Daejeon 34141, Korea

Energies, 2017, vol. 10, issue 3, 1-20

Abstract: This paper proposes an autonomous coil alignment system (ACAS) for electric vehicles (EVs) with dynamic wireless charging (DWC) to mitigate the reduction in received power caused by lateral misalignment between the source and load coils. The key component of the ACAS is a novel sensor coil design, which can detect the load coil’s left or right position relative to the source coil by observing the change in voltage phase. This allows the lateral misalignment to be estimated through the wireless power transfer (WPT) system alone, which is a novel tracking method for vehicular applications. Once misalignment is detected, the vehicle’s lateral position is self-adjusted by an autonomous steering function. The feasibility of the overall operation of the ACAS was verified through simulation and experiments. In addition, an analysis based on experimental results was conducted, demonstrating that 26% more energy can be transferred during DWC with the ACAS, just by keeping the vehicle’s load coil aligned with the source coil.

Keywords: electric vehicle (EV); dynamic wireless charging (DWC); wireless power transfer (WPT); power degradation; coil misalignment; magnetic sensing (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: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (16)

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