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Open AccessArticle

Unilateral Route Method to Estimate Practical Mutual Inductance for Multi-Coil WPT System

Department of Radio Communication Engineering, Korea Maritime and Ocean University (KMOU), Busan 49112, Korea
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Electronics 2020, 9(2), 377; https://doi.org/10.3390/electronics9020377
Received: 20 January 2020 / Revised: 14 February 2020 / Accepted: 21 February 2020 / Published: 24 February 2020
(This article belongs to the Special Issue Wireless Power/Data Transfer, Energy Harvesting System Design)
Multi-coil WPT systems require mutual inductance information between coils to increase the power transmission efficiency. However, in the high frequency (HF) bands such as 6.78 MHz and 13.56 MHz, the presence of surrounding coils changes the value of the mutual inductance between the two coils due to the parasitic element effect of the coils. These parasitic effects make it harder to estimate the mutual inductance among three or more coils. In contrast to ideal mutual inductance, which has a constant value regardless of frequency and surrounding coils, we define the practical mutual inductance as the mutual inductance varied by parasitic elements. In this paper, a new method is presented to estimate the practical mutual inductance between multiple coils in the HF band. The proposed method simply configures the expression of practical mutual inductance formula because only one of two bilateral dependent voltage sources generated by mutual inductance is considered. For several coils placed along the same axis, the practical mutual inductances between coils were measured with respect to the distance between them to validate the proposed method. The practical mutual inductance obtained from the proposed method was consistent with the simulated and measured values in HF band. View Full-Text
Keywords: multiple coils; mutual inductance; parasitic effect; practical mutual inductance; transfer impedance; wireless power transfer multiple coils; mutual inductance; parasitic effect; practical mutual inductance; transfer impedance; wireless power transfer
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Jeon, S.-J.; Lee, S.-H.; Seo, D.-W. Unilateral Route Method to Estimate Practical Mutual Inductance for Multi-Coil WPT System. Electronics 2020, 9, 377.

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