http://182.160.117.219:8080/xmlui/handle/123456789/2 2026-05-13T20:58:41Z 2026-05-13T20:58:41Z Tanbir Ibne Anowar, Narendra Kumar Harikrishnan Ramiah, Ahmed Wasif Reza http://182.160.117.219:8080/xmlui/handle/123456789/106 2018-10-16T08:36:30Z 2017-05-04T00:00:00Z

Efficiency Enhancement of Wireless Power Transfer with Optimum Coupling Mechanism for Mid-range Operation Tanbir Ibne Anowar, Narendra Kumar; Harikrishnan Ramiah, Ahmed Wasif Reza This paper depicts the design, implementation and analysis of efficient resonant based wireless power transfer (WPT) technique using three magnetic coupled coils. This work is suitable for mid ranged device due to small form factor while minimizing the loading effect. A multi turned loop size resonator is exploited for both the transmitter and receiver for longer distance. In this paper, class- E power amplifier (class-E PA) is introduced with an optimum power tracking mechanism of WPT system to enhance the power capability at mid-range with a flat gain. A robust method of finding optimum distance is derived with an experimental analysis of the designed system. In this method, the load sensitive issue of WPT is resolved by tuning coupling coefficient at considerable distances. Our designed PA with a drain efficiency of 77.8% for a maximum output of 5W is used with adopted tuning technique that improves the overall WPT system performance by 3 dB at various operating points.

2017-05-04T00:00:00Z Tanbir Ibne Anowar, Surajit Das Barman Ahmed Wasif Reza, Narendra Kumar http://182.160.117.219:8080/xmlui/handle/123456789/105 2018-10-16T08:09:32Z 2017-04-21T00:00:00Z

High-efficiency resonant coupled wireless power transfer via tunable impedance matching Tanbir Ibne Anowar, Surajit Das Barman; Ahmed Wasif Reza, Narendra Kumar 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.

2017-04-21T00:00:00Z Tanbir Ibne Anowar, Ahmed Wasif Reza, Narendra Kumar, Surajit Das Barman http://182.160.117.219:8080/xmlui/handle/123456789/104 2018-10-16T08:04:59Z 2016-04-29T00:00:00Z

Two-side Impedance Matching for Maximum Wireless Power Transmission Tanbir Ibne Anowar, Ahmed Wasif Reza,; Narendra Kumar, Surajit Das Barman The research on high-efficient non-radiant wireless power transmission (WPT) system using highquality factor resonant coupled coils has become remarkable for powering various portable household devices, biomedical implants, and electrical vehicles since last decade. Therefore, practical WPT must be able to support complicated coil configurations and keep following magnetic resonant conditions with maximum power transfer capability during coupling distance variation. In this paper, an adaptive two-side impedance matching technique using self-tuned L-matching circuits at both the transmitting and receiving sides is proposed for maximizing transmission efficiency in resonant coupled WPT system. The tuning value of inductance and capacitance for matching networks are derived based on the Q-based design principle, and extracted impedance ratios and S-parameters. The feasibility of the theoretical model is testified against simulation and measured data. The developed model shows that using two-side matching technique maximizes transmission efficiency over 80% for a range of 15 35 cm. The proposed technique also successfully retains the resonant frequency and is much more potential to provide maximum efficiency for the resonant coupled WPT system.

2016-04-29T00:00:00Z