A Novel Approach for Supplying Wireless Energy to Multiple Devices Simultaneously Using Sweeping Effect

A Novel Approach for Supplying Wireless Energy to Multiple Devices Simultaneously Using Sweeping Effect

Askin Erdem Gundogdu (General Directorate of Land Registry and Cadastre, Turkey) and Erkan Afacan (Gazi University, Turkey)
DOI: 10.4018/978-1-4666-4715-2.ch003
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There has been great interest in wireless power transmission since 2007 when a novel approach was presented by a group of scientists at MIT. With this new technique, power transmission range is possible for a couple of meters with high efficiency; however, to be able to use this technique in our lives with high efficiency and long transfer range, small structured devices and new design techniques are strongly required. In this chapter, the investigation on supplying energy by sweeping was presented. The experimental results claim that energy could be supplied to multiple devices almost at the same time. If the range of chosen frequency increases, the number of devices could be increased as well, considering slight energy efficiency loss in the transfer system. The authors hope that the proposed technique gives inspiration to the designers and to the market.
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Review Of Literature

In 2007, Karalis et al. came up with a new technique known as Witricity which is based on Coupled Mode Theory. This theory is based on quantum physics and proposes that two resonant objects are biased to exchange energy through strong coupling. Won et al. (2010), Noguchi et al. (2011), Kao and Lin (2011), Ghenim et al. (2011), Tsai et al. (2011) and Zhang and Ho (2011) have taken innovative initiatives which propose wireless data transfer besides transferring energy at the same time. In the mentioned publications, it was shown that modulation techniques such as ASK, FSK and OFDM could be used to supply data and energy at the same time. Gundogdu and Afacan (2011) concluded that low load value in the transfer system offers more efficiency and sine wave has preferable efficiency than square and triangle waves; whereas these wave types are also suitable for energy transfer. Kim et al. (2010), Gundogdu and Afacan (2012a), and Ahn and Hong (2013) reported that more than one transmitter or receiver could be used and it is beneficial for the energy transfer system. Massa et al. (2013) introduced innovative array design techniques for long distance wireless power transmission.

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