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Simulation Analysis of Coupling Coil of 13.56MHz Magnetic Coupling Resonant Wireless Energy Transmission System

To find a new growth point for the improvement of the coupling coil transmission efficiency in the 13.56 MHz magnetic coupling resonant wireless energy transmission (WET) system, and to provide a new solution for the improvement of the transmission efficiency of the entire system. This paper takes the coupling coil (including the primary transmitting coil and the secondary receiving coil) in the 13.56 MHz magnetic coupling resonance WET system as the basic research object. First, the Ansoft HFSS simulation software is used to digitally model the coupling coil, and the inductance value of the coupling coil and the magnetic induction intensity (denote by $\boldsymbol{B}$) around a single coil are obtained through simulation calculations. Furthermore, through simulation, the distribution of magnetic induction intensity and magnetic induction intensity vector under different transmission distances between the coupling coil are obtained. Secondly, the coupling coil model established by Solidworks software was imported into Ansoft Maxwell simulation software in a certain format, and the magnetic field distribution at different vertical distances between the coupling coil and the offset distance of the central axis were obtained through simulation calculations. In this paper, the problem of the transmission efficiency of the coupling coil is transformed into the problem of the coupling coefficient, and the coupling coefficient and mutual inductance between the coupling coil at different transmission distances are obtained by Ansoft Maxwell simulation calculation, and the effects of the vertical distance between the coupling coil and the offset distance of the central axis on the coupling coefficient and mutual inductance of the coupling coil are analyzed. Finally, this article uses Ansoft HFSS to simulate and analyze the influence of the composite film on the inductance and magnetic field distribution of the coupling coil. This will provide a theoretical basis for the integration of the composite film in the 13.56 MHz magnetic coupling resonance WET system.