Research on magnetic coupling resonance wireless power transfer system with variable coil structure

Wireless power transfer technology is widely used in implantable medical devices, electric vehicles and other field, but the problem of magnetic coupling resonance technology is that transmission efficiency is limited by transmission distance, which restricts the popularization and application of this technology. Aiming at the problem existing in the magnetic coupling resonance wireless energy transfer system, the mutual inductance coupling theory is adopting to model of resonance coupling unit, the calculation method of voltage > current and circuit parameters of the circuit of each part of the system are proposed, the relationship between the system transmission efficiency of two-coil and four-coil structure for resonance coupling part and transmission distance is analyzed, and a magnetic coupling resonance wireless power transfer system with variable coil structure is designed. According to the structure parameters of the design system, the simulation and experiment system are built, the transmission efficiency of the system are proved by simulation and experiment, and the experiment results verify the effectiveness and practicability of the designed coil structure, which can achieve the maximization of transmission efficiency of wireless power transfer system with variable coil structure under different transmission distances.