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

被引:7
作者
Anowar, Tanbir Ibne [1 ]
Das Barman, Surajit [1 ]
Reza, Ahmed Wasif [2 ]
Kumar, Narendra [1 ]
机构
[1] Univ Malaya, Dept Elect Engn, Fac Engn, Kuala Lumpur, Malaysia
[2] East West Univ, Dept Comp Sci & Engn, Fac Sci & Engn, Dhaka, Bangladesh
关键词
Wireless power transfer; magnetic resonance coupling; power transfer efficiency; optimum coupling tuning; impedance matching; frequency splitting; TRANSMISSION; SYSTEMS; RANGE; DESIGN;
D O I
10.1080/00207217.2017.1312711
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
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 70cm, respectively. Applying this technique, the extracted S-21 parameter shows more than 10dB 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.
引用
收藏
页码:1607 / 1625
页数:19
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