Design Considerations for Adding Series Inductors to Reduce Electromagnetic Field Interference in an Over-Coupled WPT System

Yujun Shin, Jaehyoung Park, Haerim Kim, Seongho Woo, Bumjin Park, Sungryul Huh, Changmin Lee and Seungyoung Ahn
Additional contact information
Yujun Shin: The Cho Chun Shik Graduate School for Green Transportation, KAIST, Daejeon 34051, Korea
Jaehyoung Park: Hardware Engineering Group, Samsung Electronics, Suwon 16677, Korea
Haerim Kim: The Cho Chun Shik Graduate School for Green Transportation, KAIST, Daejeon 34051, Korea
Seongho Woo: The Cho Chun Shik Graduate School for Green Transportation, KAIST, Daejeon 34051, Korea
Bumjin Park: The Cho Chun Shik Graduate School for Green Transportation, KAIST, Daejeon 34051, Korea
Sungryul Huh: The Cho Chun Shik Graduate School for Green Transportation, KAIST, Daejeon 34051, Korea
Changmin Lee: The Cho Chun Shik Graduate School for Green Transportation, KAIST, Daejeon 34051, Korea
Seungyoung Ahn: The Cho Chun Shik Graduate School for Green Transportation, KAIST, Daejeon 34051, Korea

Energies, 2021, vol. 14, issue 10, 1-28

Abstract: This paper analyzes how over-coupled coils affect odd harmonic current and electromagnetic interference (EMI) in a wireless power transfer (WPT) system, and proposes design considerations for series inductors to solve the EMI problem. When the air gap of the coils of the WPT system decreases below a certain level and the coils are over-coupled, the odd harmonic component of the input impedance of the system decreases and odd harmonic currents increase. The increase in the odd harmonic components current quickly aggravates the EMI issues. To solve the EMI problem of the over-coupled WPT system, additional series inductors were applied to the system, and considerations for designing the series inductors were analyzed. When designing additional series inductors, power transfer efficiency, maximum power transfer, input impedance and odd harmonic components current must be considered. Using simulations and experiments, it was confirmed that the WPT system designed with analyzed considerations maintained relatively high efficiency and reduced EMI issues.

Keywords: wireless power transfer (WPT); over-coupled coils; electromagnetic interference (EMI) reduction; series inductors; topology; input impedance (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: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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