Research On Frequency Splitting Of Four-coil Magnetically Coupled Resonant Wireless Energy Transmission System Based On DE Algorithm

Wireless power transmission technology(Wireless Power Transmission,WPT),as an emerging power transmission mode,has gradually become a research hotspot in recent years.As one of the main modes of WPT technology,magnetic coupling resonance wireless energy transmission technology not only has great application prospects,long transmission distance but also penetrates obstacles.It makes up for the shortcomings of traditional electric energy transmission methods and realizes safe wireless transmission,but the power and efficiency of the system need to be further improved in the process of energy transmission.Therefore,the research on magnetic coupling resonance wireless energy transmission technology has important scientific significance and application value.At present,the magnetic coupling resonance wireless energy transmission technology is still a certain distance away from popularization and promotion.During the energy transmission process of the system,various factors such as the change in the position of the energy transmission distance and the deviation between the resonance coils will affect the entire transmission system.The stability of the system causes the transmission power and efficiency of the system to drop significantly.Aiming at the above problems,this paper studies the relationship between power and efficiency in the over-coupling state of the four-coil magnetically coupled resonant wireless power transmission system and the frequency splitting phenomenon caused by the change of the energy transmission distance.First of all,this paper introduces the basic principles of the four-coil magnetic coupling resonance wireless energy transmission technology,and models the system from the two perspectives of mode coupling theory and circuit theory.Through research and calculation,it is found that when the system is in an over-coupling state,the system has a frequency splitting phenomenon,and the power and efficiency of the system in wireless energy transmission drop sharply.On this basis,the causes of frequency splitting are analyzed,and the relevant factors that affect the frequency splitting of the system are obtained,which provides a theoretical basis for frequency adaptive adjustment.Secondly,based on the principle of four-coil magnetically coupled resonant wireless power transmission,a four-coil magnetically coupled resonant wireless power transmission frequency adaptive adjustment system is designed,which mainly includes a control module,a signal generation module,a power amplification module,a resonance module,Rectifier module,wireless communication module and power detection module.Based on the design of frequency selfadaptive adjustment,after analyzing the frequency split state in this paper,two optimization algorithms and their improved methods are studied,and the feasibility of the algorithm is verified by Matlab simulation.The improved algorithm is embedded in the DSP control module,combined with the power detection and wireless communication module,to realize the adaptive adjustment of the system frequency,thereby improving the power and efficiency of the system.Finally,the correctness of the theoretical research is verified through the construction of a four-coil magnetic resonance wireless energy transmission system.Firstly,the experiment is conducted to verify whether the frequency split phenomenon will occur in three different states: over-coupling,under-coupling and critical coupling,and the frequency characteristic curves under the three states are obtained.The experimental results show that the system will occur under oversaturated coupling.Frequency split phenomenon.Secondly,in the supersaturated coupling state,the power efficiency of the system under two different conditions of fixed frequency and adaptive adjustment frequency was experimentally verified.The experimental results show that the frequency adaptive adjustment method is feasible to suppress the frequency splitting phenomenon.