Sweeping Effect on Witricity

Sweeping Effect on Witricity

Askin Erdem Gundogdu (General Directorate of Land Registry and Cadastre, Turkey) and Erkan Afacan (Gazi University, Turkey)
DOI: 10.4018/jitn.2012070104
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Abstract

Wireless power transmission has become very popular since 2007 and there are many movements to integrate this new technique into our daily lives rapidly. For now, the main drawback in this technology is efficiency in long range. Whenever this challenge is tackled and many devices charging without cables enter daily life, there will be a desire to charge them at the same time without trouble. In this paper, the investigation results of sweeping are presented which seems to be the most appropriate approach for charging many devices at the same time. Experimental results offer that narrow MHz band is suitable for a few devices to supply power whereas a wide range of MHz band gives the opportunity to power up much more devices without remarkable efficiency loss. It is believed that these results will inspire new thoughts and point the way of new designs.
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Review Of Literature

Karalis et al. (2007) published the new technology called Witricity which is based on Coupled Mode Theory. This theory briefly explains that two resonant objects tend to exchange energy due to strong coupling. Both transmitter and receiver resonators should be inductively coupled so that the energy exchange becomes real. Zhang et al. (2009) and Liu et al. (2009) reported that using different kinds of resonators in the system makes energy exchange possible and pretty effective. Zhang et al. (2010) and Gundogdu et al. (2012) found out that placing a relay resonator between transmitter and receiver increases the range of the system and efficiency when it is compared to the transmission distance without a relay resonator. Gundogdu et al. (2011) explored that low load resistor values provide higher efficiency in the system. Square and triangle waveforms could be used besides sine wave; however sine wave is more efficient in the transfer system. Gundogdu et al. (2012) also reported that relay resonator could be implemented just placing an inductor, besides completing an RLC circuit of the resonator increases efficiency. They found out that adding more than one transmitter or receiver increases system’s transfer efficiency. Aligning resonators on vertical axis has more efficiency than aligning on horizontal axis.

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