4.6 Article

Effect of Misaligned Relay on Output Power and Efficiency in Wireless Power Transfer

Journal

IEEE ACCESS
Volume 9, Issue -, Pages 49448-49456

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2021.3069131

Keywords

Relays; Power generation; Resonators; Couplings; Transmitters; Receivers; Integrated circuit modeling; Wireless power transfer; magnetic resonance; misalignment; relay activation; output power; efficiency

Funding

  1. National Research Foundation of Korea (NRF) Grant by the Korean Government through MSIT [2021R1A2C4002024]
  2. Gyeongsang National University Fund for Professors on Sabbatical Leave, 2020
  3. National Research Foundation of Korea [2021R1A2C4002024] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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This study analyzes the impact of misaligned relays on output power and efficiency in magnetic resonance-based wireless power transfer systems, proposing a method to determine relay activation based on the degree of misalignment. Through simulation and experimental verification, it was found that output power is more vulnerable to relay misalignment.
In magnetic resonance-based wireless power transfer (WPT), any misalignment between resonators degrades the strength of the magnetic coupling, and the use of a relay does not always improve performance if it is misaligned with a transmitter or a receiver. It is therefore necessary to determine the proper activation of a relay depending on the degree of misalignment. In this paper, we analyze the effect of a misaligned relay on two important performance metrics in WPT, namely output power and efficiency. In particular, we derive the achievable output power and efficiency with optimal load resistance based on an equivalent circuit model, and determine whether it is beneficial to utilize the relay for a given lateral and angular misalignment. By simulation and experimental verifications under various environments, we validate the exactness of our analysis, and we also confirm two interesting observations, namely 1) with regard to performance improvement in terms of output power and efficiency, it is better to deactivate the relay if it is seriously misaligned with the other resonators and 2) output power is more vulnerable to the misalignment of a relay than efficiency.

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