There are several resonance frequencies points in the high-order resonant network to realize constant current/constant voltage output, but the disturbance of the resonant network parameters will affect the output characteristics of the system. Therefore, selecting the appropriate resonant frequency is necessary to achieve stable output characteristics of wireless power transmission. This paper analyzes the influence of sensitivity of the double-sided LCC compensation network parameters on resonance point and output characteristics. Moreover, this paper proposes a design method to realize load-independent constant current and constant voltage output under two ZPA frequencies, and the resonance parameters are optimized for the realization of ZVS. Under constant current and constant voltage output resonant points, the transmission efficiency of the double-sided LCC IPT system reaches 88.9% and 88.5%, respectively.

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With the continuous development of science and the level of modern sports, scientists and sports workers all over the world have realized the importance of the application of new materials in sports equipment. Through the analysis of graphene rubber and graphene fiber, we have found the function of graphene rubber and graphene fiber in some fields. These materials include graphene rubber composites, graphene fiber composites and graphene magnesium matrix composites which can be used in the field of sports equipment. So we should further explore the application prospect of graphene polymer materials in sports equipment. By using the methods of literature, comparison and qualitative analysis, this paper takes the graphene rubber composite polymer material and the graphene fiber composite polymer material as the research object, and applies the graphene technology to the sports equipment such as shoes, rackets, bicycles, etc. The analysis of existing graphene technology can theoretically explore the application of graphene technology in sports equipment, realize the organic combination of graphene field and sports field at the theoretical level, and promote the application of graphene technology in sports field.

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