Equivalent Circuit Modeling and Experimental Analysis of Low Frequency Metamaterial for Efficient Wireless Power Transfer

Adepoju, Webster; Bhattacharya, Indranil; Sanyaolu, Mary; Esfahani, Ebrahim Nasr

doi:10.1109/access.2022.3199065

Cited by 10 publications

(7 citation statements)

References 28 publications

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“…The result showed that the efficiency of the WPTS with EM is 15% higher than that of the system without EM within an angle variation range of 70° 17 . In addition, WPTS with EM designed by WEBSTER ADEPOJU achieved a 28% of improvement in efficiency when deflection angle is 40°, in 2022 18 . The above references prove that for WPTS, EM are beneficial to improve transmission efficiency and solve long‐distance transmission and angle deflection problems.…”

Section: Introductionmentioning

confidence: 85%

“…17 In addition, WPTS with EM designed by WEBSTER ADEPOJU achieved a 28% of improvement in efficiency when deflection angle is 40 , in 2022. 18 The above references prove that for WPTS, EM are beneficial to improve transmission efficiency and solve long-distance transmission and angle deflection problems. Unfortunately, the structure of EM proposed in previous work is homogeneous, which cannot achieve precise control of the magnetic field and limits the further improvement of the transmission efficiency.…”

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confidence: 95%

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Long‐distance and anti‐disturbance wireless power transfer based on concentric three‐coil resonator and inhomogeneous electromagnetic metamaterials

Yuan

et al. 2023

Circuit Theory & Apps

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For wireless power transfer system (WPTS), the deflection of the resonant coil and the increase of the transmission distance will cause a sharp decline in transmission efficiency. This paper presents a novel long-distance and anti-deflection wireless power transfer based on concentric three-coil resonator and inhomogeneous electromagnetic metamaterials (IEM). First, the effective receiving area of the resonator is analyzed, and the anti-disturbance concentric three-coil resonator is designed quantitatively. Considering the magnetic field distribution generated by the transmitting coil, this paper proposes and designs IEM with three kinds of effective permeability, which is applied in different design area, respectively. Meanwhile, the finite-element-method simulation proves an improvement in magnetic field modulation and flux leakage control when WPTS with IEM is used. The experimental results show that, compared with the traditional one-coil to one-coil, the WPTS designed in this paper achieves an increase of 43% in the efficiency at a 90 deflection. Furthermore, the efficiency of WPTS with IEM is 17% and 7% higher than that of WPTS with homogeneous electromagnetic metamaterials (HEM) and without electromagnetic metamaterials. As a result, the design method in this paper can improve the anti-disturbance capability and increase the transmission distance and efficiency.

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Section: Introductionmentioning

confidence: 85%

mentioning

confidence: 95%

Long‐distance and anti‐disturbance wireless power transfer based on concentric three‐coil resonator and inhomogeneous electromagnetic metamaterials

Yuan

et al. 2023

Circuit Theory & Apps

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“…( 8) is represented by combining the compensation capacitor (C com ) and the stray capacitance (C s ) shown in Equation. (9).…”

Section: A Physics-based Extraction Of Medium Parameters and Performa...mentioning

confidence: 99%

“…However, in extremely sub-wavelength regions, there is a separation between the electric and magnetic fields, allowing the amplification of the evanescent wave and the attainment of a negative refractive index (n < 0). To achieve practical low-frequency MTM structures with valid medium parameters, the MTM unit cell must satisfy the homogenization criterion, which specifies a small sample size (l ≪ λ) compared to the wavelength at the operating frequency [7], [8], [9], [10], [11], [12], [13]. Numerous MTM designs and geometries have been reported in the literature to improve the performance of wireless power transfer (WPT).…”

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confidence: 99%

“…Although these MTM-based WPT designs exhibit superior performance in comparison to conventional coil structures, nonetheless, they typically resonate at significantly high radio and microwave frequencies, which is unfavorable for high-efficiency WPT applications [22], [23], [24]. In general, high resonant frequency results in high voltage and current stresses on passive components while also subjecting power semiconductor/MOSFET to high switching stress, leading to increased power dissipation, low efficiency, and degradation in WPT performance [10], [22], [23], [24], [25], [25], [26], [27].…”

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confidence: 99%

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Metaheuristic-Based Optimization and Prototype Investigation of Low Frequency Metamaterial for Wireless Power Transfer Application

Adepoju,

Bhattacharya,

Sanyaolu

et al. 2023

IEEE Access

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The adoption of wireless charging technologies for consumer and industrial applications is inhibited by concerns over reliability culminating from the fluctuating output power, low transmit power, and power transfer efficiency (PTE) of these systems. Besides, the inherently high radio and microwave resonant frequency of existing Metamaterial (MTM) designs imposes high switching stress on power switches and passive components, leading to significant power loss and enormously high degradation in system performance. This manuscript presents a compact, low-frequency MTM-based Wireless Power Transfer (WPT) structure coupled with a comprehensive investigation of the effect of physical parameters on the resonant frequency where left-handed characteristics occur. Model design and simulation were conducted in ANSYS High-Frequency Structure Simulator (HFSS) to extract the transmission coefficient and reflection coefficient while realizing negative permeability at a resonant frequency (f o ) of 1.2MHz. To further mitigate the resonant frequency of the MTM, a metaheuristic-based parameter optimization algorithm was implemented to achieve negative permeability and evanescent wave amplification at a resonant frequency of 750kHz, making it suitable for high-power WPT applications. A prototype MTM sample is fabricated for experimental measurement of power transfer efficiency and medium parameters, using the Keysight ENA5061 Vector Network Analyzer (VNA), effectively confirming the validity of the proposed design. The excellent efficiency enhancement and mutual coupling make the design an attractive solution for WPT applications. A close agreement between the experimental results and numerical simulation validates the accuracy of the optimization results.INDEX TERMS Wireless power transfer, finite element analysis (FEA), metamaterial (MTM), power transfer efficiency, ANSYS, high frequency structure simulator, vector network analyzer, optimization. I. INTRODUCTIONWireless Power Transfer (WPT) has been widely studied and implemented in various applications, including mobile computing [1], wireless charging of biomedical body implants [2],The associate editor coordinating the review of this manuscript and approving it for publication was Diego Masotti . and Electric Vehicles (EV) [3]. This technology was first discovered by Nikola Tesla in 1891 [4], and since then, significant research progress has been made. In 2007, researchers at MIT demonstrated the potential for efficient long-distance wireless power transmission using magnetic resonant coupling [5], and recently, Oak Ridge National Laboratory designed a 120-kilowatt WPT prototype for the wireless

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Finite Element Analysis on Enhancement of Contactless Power Transfer by Using Metamaterials—A Review

Zainol,

Abdul Razak,

Ismail

2023

Advanced Structured Materials

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Equivalent Circuit Modeling and Experimental Analysis of Low Frequency Metamaterial for Efficient Wireless Power Transfer

Cited by 10 publications

References 28 publications

Long‐distance and anti‐disturbance wireless power transfer based on concentric three‐coil resonator and inhomogeneous electromagnetic metamaterials

Long‐distance and anti‐disturbance wireless power transfer based on concentric three‐coil resonator and inhomogeneous electromagnetic metamaterials

Metaheuristic-Based Optimization and Prototype Investigation of Low Frequency Metamaterial for Wireless Power Transfer Application

Finite Element Analysis on Enhancement of Contactless Power Transfer by Using Metamaterials—A Review

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