Study On The Equivalent Circuit Of Wireiess Power Transfer System Based On WiTricity Technology

The research object of this paper is wireless electricity transmission which is based on WiTricity technology, it introduces two theory analysis methods, which are coupled mode theory and equivalent circuits theory, for wireless energy transfer system via coupled magnetic resonance. The wireless energy transfer system formed by prime and secondary series resonant circuits via coupled magnetic resonance has been analyzed in detail in this issue, and the influence to transfer power and transfer efficiency brought by frequency and coupled coefficient also have been described. Additionally, referent formula and conclusion as well as the condition when the load is so much high that the secondary circuit utilizes parallel connection have been presented in the article.More important, also simulate two kinds of equivalent circuits, one of which is series prime and secondary circuit loop and the other is series prime loop coupled with parallel secondary loop. Simulation chart about relationship between frequency, coupled coefficient and the power received by the load, transfer efficiency are not only given but also analyze and compare the results among each different situation. Finally, influence on the performance of energy transmission brought by the relationship between the figure of merit of prime and secondary loops have been talked about and the validity of the formula and conclusion derived from the analysis of equivalent circuit theory has been verified.