Application Research On Key Technologies Of Resonant Wireless Charging

This paper takes the constant current and constant voltage charging of magnetically coupled resonant wireless charging system as the research goal,and studies some key technical problems in the practical application of magnetic coupling resonant wireless charging technology.First of all,this paper introduces several wireless charging technologies,and briefly explains their basic structure,transmission principle,and the development status of magnetically coupled resonant wireless charging technology.The finite element simulation software Maxwell was used to analyze the coil.The relationship between the relative position change of the planar coil and the coupling coefficient was analyzed.The coupling coefficient between the coils was effectively improved by adding the magnetic core,and the basic resonance compensation topology was built.Model analysis and pointed out the shortcomings.Secondly,the realization methods of several constant current and constant voltage wireless charging are compared and analyzed.The hybrid compensation method is simple in structure and convenient in control.It is more suitable for the realization of constant current and constant voltage wireless charging.The impedance analysis method is used to establish LCC-S and LCC respectively.-LCC two kinds of resonance compensation topology system model,the output characteristics,energy efficiency characteristics and frequency characteristics of two kinds of resonance compensation topologies are analyzed.According to the analysis results,open loop control is proposed for the realization of constant current and constant voltage wireless charging.Hybrid compensation type wireless charging system and closed-loop control hybrid compensation type wireless charging system two system structure schemes,each structure scheme has its own adaptation range and advantages,and the corresponding closed-loop control algorithm is designed.Finally,an experimental platform was built,and the design of the key parts of the hardware circuit was described in detail.The open-loop experiment and closed-loop experiment were carried out respectively.The experimental results verified the correctness of the theoretical analysis and the feasibility of the scheme.