Analysis of wireless power transmission efficiency based on electromagnetic resonance coupling mode

Resonant coupling wireless power transmission technology fulfills power transmission through the two coils, which have the same resonant frequency to generate high-frequency alternating magnetic field. Compared with the traditional wire transmission, this technique is more flexible, efficient and permeable. In this paper, the system simulation and analysis are carried out on PSpice simulation platform, using the coupled mode theory, K_Linear extraction method and the coupled algorithm based on state variables. The results show that the energy loss of the system mainly exists in the inverter and rectifier module, the whole system transmission efficiency can reach 45.3%; the coupling coefficient is positively related to the transmission efficiency, with an optimum resonance frequency of the system. The use of PSpice transmission efficiency simulation is helpful to the system design and parameters optimization, thus meaningful to the application of wireless power transmission technology.