An automated frequency tracking system is implemented for an efficient mid‐range magnetic resonance wireless power transfer based on an analysis of a wireless power link consisting of transmitting and receiving resonators placed in a strong coupling region.The proposed tracking system is designed to maintain a power transfer efficiency of more than 70% for any transfer distance range by directly monitoring the efficiency via out‐band communication. The advantage of the proposed system over other frequency tracking schemes is that the performance of the resonators and power amplifier can be applied to the tracking algorithm. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1423–1426, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26858

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Abstract-Recently, resonance phenomenon in wireless power transfer (WPT) is widely used to deliver power to a load over relatively large air gap via magnetic coupling. Since many reactive components in WPT system are contributed to the resonance phenomenon, there are many resonant frequencies.Theses resonant frequencies have different and distinguishing features. For this reason, the analysis of the resonant tank at various resonant frequencies is required to understand WPT system more easily. Therefore, in this paper, three resonant frequencies in series-series compensated WPT (SS-WPT) system are defined. And then, this paper is aiming to present the features of SS-WPT system in the major two of the three resonant frequencies. The analysis is supported with experimental results.