High-efficiency resonant coupled wireless power transfer via tunable impedance matching

Anowar, T.I. and Barman, S.D. and Wasif Reza, A. and Kumar, N. (2017) High-efficiency resonant coupled wireless power transfer via tunable impedance matching. International Journal of Electronics, 104 (10). pp. 1607-1625. ISSN 0020-7217, DOI https://doi.org/10.1080/00207217.2017.1312711.

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Official URL: http://dx.doi.org/10.1080/00207217.2017.1312711


For magnetic resonant coupled wireless power transfer (WPT), the axial movement of near-field coupled coils adversely degrades the power transfer efficiency (PTE) of the system and often creates sub-resonance. This paper presents a tunable impedance matching technique based on optimum coupling tuning to enhance the efficiency of resonant coupled WPT system. The optimum power transfer model is analysed from equivalent circuit model via reflected load principle, and the adequate matching are achieved through the optimum tuning of coupling coefficients at both the transmitting and receiving end of the system. Both simulations and experiments are performed to evaluate the theoretical model of the proposed matching technique, and results in a PTE over 80% at close coil proximity without shifting the original resonant frequency. Compared to the fixed coupled WPT, the extracted efficiency shows 15.1% and 19.9% improvements at the centre-to-centre misalignment of 10 and 70 cm, respectively. Applying this technique, the extracted S21 parameter shows more than 10 dB improvements at both strong and weak couplings. Through the developed model, the optimum coupling tuning also significantly improves the performance over matching techniques using frequency tracking and tunable matching circuits.

Item Type: Article
Funders: University of Malaya High Impact Research (HIR) Grant (UM.C/628/HIR/ENG/51) sponsored by the Ministry of Higher Education (MOHE), Malaysia
Uncontrolled Keywords: Wireless power transfer; Magnetic resonance coupling; Power transfer efficiency; Optimum coupling tuning; Impedance matching; Frequency splitting
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 21 Jul 2017 09:04
Last Modified: 21 Jul 2017 09:04
URI: http://eprints.um.edu.my/id/eprint/17560

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