Developments Of Non-radiative Magnetic Resonance Strongly Coupled Wireless Power Transfer System

Wireless power transfer (WPT) has eliminated greatly the disadvantages related to the traditional power transfer of conductors, improving the safety and convenience of applications, especially in extreme environments. Consequently, WPT is a promising technology in both study and application. Currently, WPT is classified into3groups, i.e., the electromagnetic induction WPT, electromagnetic radiation WPT, and the resonant magnetic coupling WPT (also called witricity). Witricity is a new entrant of WPTs, and was proposed by MIT researchers in2006. Compared with other technologies, witricity has a lot of advantages, and become the most dominant technology in the future on WPT. However, there are still many technology challenges and a significant gap between laboratory study and engineering application.Based on the theory of witricity, as well as the available research findings, further research and development on WPT are conducted. More concretely, the equivalent circuit model of the coil used in WPT is proposed. According to equivalent circuit, the method to compute the distributed parameters of the model is given. The matlab is used to compute and analyze the performance of the equivalent circuit, and the impedance characteristic curve is finally calculated from which the resonant frequency is readily obtained.To promote engineering applications, considering the varying conditions and environments of the coil in practical applications, an intelligent control system is developed to keep the optimal working state. Moreover, according to the shortcomings and situation of present charging equipments, a wireless charging equipment is finally developed.