Research On Misalignment Tolerance Of WPT System Based On Dual-Frequency Tuning

Wireless Power Transfer(WPT)is a technology that utilizes electromagnetic fields for noncontact power transmission.It not only has the advantages of safety,reliability,and environmental friendliness,but also has been widely used in many fields.In practical applications,WPT systems are extremely sensitive to the relative position between the transmitting coil and the receiving coil,and small deviations can cause changes in the coupling coefficient,affecting the stability of the system.Inder to address the above issues,based on the fundamental and third harmonic frequencies of the square wave voltage output by the full bridge inverter,this paper proposes a hybrid compensation network and designs a coupling mechanism with anti-offset characteristics.Based on this,the circuit parameters are optimized to ensure that the system can output constant power during offset,and has the characteristics of low cost,strong anti-offset,and high reliability.The main research contents of this article are as follows:1)Research on hybrid compensation network for dual frequency tuned WPT system.By analyzing the output characteristics of SS,LCC-S,and LCC-P compensation networks,the relationship between the output power of the compensation network and the coupling coefficient and load is obtained.Based on the fundamental frequency and third harmonic frequency of the square wave voltage output by the full bridge inverter,combined with the power transmission characteristics of SS and LCC-S circuit topologies,a hybrid compensation network with load resistance and offset disturbance resistance is proposed.2)Design of coupling mechanism for dual frequency tuned WPT system.Firstly,this paper develops an asymmetric coupling mechanism based on rounded square coils,and optimizes its parameters to obtain the optimal solution for the coupling mechanism parameters.Secondly,based on the shielding mechanism,electromagnetic shielding is used to improve the transmission capacity of the coupling mechanism.Finally,the variation law of the coupling coefficient of the asymmetric rounded square coupling mechanism under different directions of displacement was measured through experiments,verifying that the coupling mechanism has strong antidisplacement ability in the plane.3)Optimization design of dual frequency tuned WPT system.Considering that the parameters of the WPT system are crucial to its output power.To improve the anti-load disturbance and anti-offset capabilities of the WPT system,the PSO algorithm is used to optimize the parameters of the WPT system,obtain the optimal value of the system compensation network parameters,and ensure that the system still has relatively stable output power during offset and load changes.4)According to the system design,circuit simulation tests are carried out to analyze the antioffset characteristics in different directions to verify the feasibility of theoretical analysis.In addition,an experimental platform for WPT system with dual-frequency tuning was built,and the application of compensation network and coupling mechanism based on dual-frequency tuning in wireless power transmission system was in-depth researched,and certain research results were achieved.