Research On Low Frequency Magnetically Resonant Wireless Power Transfer System With Switch-Controlled Capacitor

With further study of wireless power transfer and development of wireless power transfer industry, scenario of wireless power transfer technology will become more abundant. Under the background of rapid development of electric vehicles, electric car charging infrastructure to speed up the development of low frequency wireless power transfer technology has been potential.Electrical revolution has made transport systems become increasingly complex, but electricity consumption has not changed the way we use power. With the deepening of research, gradual development of wireless transmission, low frequency magnetically resonant wireless power transfer system was with a certain degree of academic and practical value. The main results of this study are summarized as follows:1 The research was included magnetically coupled resonance theory of wireless power transfer, the structure of mainstream wireless transmission system for near-field coupling and detailed derivation of the basic theory of technology-related was analyzed. In order to allow the model to better summarize the approximate model, a new design based on the theory of transformer coils stacked form was made.2 The wireless power transfer system of low-frequency coil resistance unified model was established, the characteristics of the power and efficiency of the system was analyzed. The mechanism of magnetic coupled resonance wireless power transfer efficiency system was explained, the efficiency of power transmission and efficiency combined with a unified has been simplified.3 The relationship between coupling coefficients of the system was analyzed, the optimal relationship between coupling coefficients has been given. Non-resonant State was derived under the driving coil and load coil capacitor and the relationship between power output and efficiency was made. Based on a simplified formula explicitly a calculation method for optimizing the export compensation capacitor has proposed.4 In order to enable the system to have better performance, improved switch-controlled capacitor(SCC) structure has been adjust the system, late phase shift control system has been provided as technology roadmap for closed-loop system.Finally, simulation and experimental has been certificated the correctness of the theory, and directions for future research were presented.