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http://dx.doi.org/10.6113/TKPE.2011.16.2.137

Circuit Model Based Analysis of a Wireless Energy Transfer System via Coupled Magnetic Resonances  

Cheon, Sang-Hoon (한국전자통신연구원)
Kim, Yong-Hae (한국전자통신연구원)
Lee, Myung-Lae (한국전자통신연구원)
Kang, Seung-Youl (한국전자통신연구원)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.16, no.2, 2011 , pp. 137-144 More about this Journal
Abstract
A Simple equivalent circuit model is developed for a wireless energy transfer system via coupled magnetic resonances and a practical design method is also provided. Node equations for the resonance system are built with the method, expanding on the equations for a transformer, and the optimum distances of coils in the system are derived analytically for optimum coupling coefficients for high transfer efficiency. In order to calculate the frequency characteristics for a lossy system, the equivalent model is established at an electric design automation tool. The model parameters of the actual system are extracted and the modeling results are compared with measurements. Through the developed model, it is seen that the system can transfer power over a mid-range of a few meters and impedance matching is important to achieve high efficiency. This developed model can be used for a design and prediction on the similar systems such as increasing the number of receiving coils and receiving modules, etc.
Keywords
Wireless; Energy transfer; Model;
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