Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Modeling and Analysis of Modified Active Frequency Drift Method
Authors Jin-Ung An ; Gwon-Jong Yu ; 李Ich Choy ; 烈Ju-Yeop Choi
DOI 10.6113/TKPE/2011.16.2.137
Page pp.137-144
ISSN 1229-2214
Keywords Wireless; Energy transfer; Model
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.