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Comparison of the Efficiency and Load Power in Periodic Wireless Power Transfer Systems with Circular and Square Planar Coils

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  • Jacek Maciej Stankiewicz

    (Department of Electrical Engineering, Power Electronics and Power Engineering, Faculty of Electrical Engineering, Bialystok University of Technology, Wiejska 45D, 15-351 Bialystok, Poland)

  • Agnieszka Choroszucho

    (Department of Electrical Engineering, Power Electronics and Power Engineering, Faculty of Electrical Engineering, Bialystok University of Technology, Wiejska 45D, 15-351 Bialystok, Poland)

Abstract

In the article, a wireless charging system with the use of periodically arranged planar coils is presented. The efficiency of two wireless power transfer (WPT) systems with different types of inductors, i.e., circular and square planar coils is compared, and two models are proposed: analytical and numerical. With the appropriate selection of a load resistance, it is possible to obtain either the maximum efficiency or the maximum power of a receiver. Therefore, the system is analyzed at two optimum modes of operation: with the maximum possible efficiency and with the highest power transmitted to the load. The analysis of many variants of the proposed wireless power transfer solution was performed. The aim was to check the influence of the geometry of the coils and their type (circular or square) on the efficiency of the system. Changes in the number of turns, the distance between the coils (transmit and receive) as well as frequency are also taken into account. The results obtained from analytical and numerical analysis were consistent; thus, the correctness of the adopted circuit and numerical model (with periodic boundary conditions) was confirmed. The proposed circuit model and the presented numerical approach allow for a quick estimate of the electrical parameters of the wireless power transmission system. The proposed system can be used to charge many receivers, e.g., electrical cars on a parking or several electronic devices. Based on the results, it was found that the square coils provide lower load power and efficiency than compared to circular coils in the entire frequency range and regardless of the analyzed geometry variants. The results and discussion of the multivariate analysis allow for a better understanding of the influence of the coil geometry on the charging effectiveness. They can also be valuable knowledge when designing this type of system.

Suggested Citation

  • Jacek Maciej Stankiewicz & Agnieszka Choroszucho, 2021. "Comparison of the Efficiency and Load Power in Periodic Wireless Power Transfer Systems with Circular and Square Planar Coils," Energies, MDPI, vol. 14(16), pages 1-24, August.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:16:p:4975-:d:613871
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    References listed on IDEAS

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    1. Sun, Longzhao & Ma, Dianguang & Tang, Houjun, 2018. "A review of recent trends in wireless power transfer technology and its applications in electric vehicle wireless charging," Renewable and Sustainable Energy Reviews, Elsevier, vol. 91(C), pages 490-503.
    2. Adam Steckiewicz & Jacek Maciej Stankiewicz & Agnieszka Choroszucho, 2020. "Numerical and Circuit Modeling of the Low-Power Periodic WPT Systems," Energies, MDPI, vol. 13(10), pages 1-17, May.
    3. Jacek Maciej Stankiewicz & Agnieszka Choroszucho & Adam Steckiewicz, 2021. "Estimation of the Maximum Efficiency and the Load Power in the Periodic WPT Systems Using Numerical and Circuit Models," Energies, MDPI, vol. 14(4), pages 1-20, February.
    4. Vincenzo Cirimele & Riccardo Torchio & Antonio Virgillito & Fabio Freschi & Piergiorgio Alotto, 2019. "Challenges in the Electromagnetic Modeling of Road Embedded Wireless Power Transfer," Energies, MDPI, vol. 12(14), pages 1-22, July.
    5. Xuezhe Wei & Zhenshi Wang & Haifeng Dai, 2014. "A Critical Review of Wireless Power Transfer via Strongly Coupled Magnetic Resonances," Energies, MDPI, vol. 7(7), pages 1-26, July.
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    1. Jacek Maciej Stankiewicz, 2023. "Evaluation of the Influence of the Load Resistance on Power and Efficiency in the Square and Circular Periodic WPT Systems," Energies, MDPI, vol. 16(7), pages 1-19, March.
    2. Xiaochen Zhang & Xiaona Wang & Pan Sun & Jun Sun & Jin Cai, 2023. "Mutual and Self-Inductance Variation in Misaligned Coupler of Inductive Power Transfer System: Mechanism, Influence, and Solutions," Energies, MDPI, vol. 16(13), pages 1-16, July.
    3. Zbigniew Sołjan & Maciej Zajkowski, 2022. "Extension and Correction of Budeanu Power Theory Based on Currents’ Physical Components (CPC) Theory for Single-Phase Systems," Energies, MDPI, vol. 15(21), pages 1-18, November.

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