Research On Optimization For Compensation Structure Of Magnetic Coupling Induced Power Transmission System

Magnetically-coupled inductive wireless power transmission technology uses the coupled electromagnetic field between the coils to realize the non-contact transmission of energy.Because of its potential to avoid aging,high voltage electric shock and other problems of cable transmission,it has broad application prospects and has gradually become a popular research direction of scholars.MCI-WPT technology is studied and analyzed in this paper and the main contents are as follows:Firstly,a new double-sided T-bridge compensation structure is introduced and used by the magnetically-coupled inductive wireless power transmission system.The resonance condition is obtained by establishing mutual inductance coupling model.Through set parameters of compensation capacitance and compensation inductance,the target with constant current of primary side and the controllable load voltage is realized.Taking the traditional S-S compensation structure as a reference,the simulation software shows that the new double-sided T-bridge compensation structure can transmit more power and is more suitable for high-power wireless power transfer system.Secondly,in view of the frequency bifurcation phenomenon caused by the compensation capacitor,this paper analyses the frequency characteristic of the system based on the circuit principle,and introduces the frequency bifurcation reaction parameter S21 to explore the relationship between the frequency and the mutual inductance coefficient.Meanwhile,the formula of the voltage gain,power and efficiency are listed.The influence of frequency bifurcation on system performance is analyzed by simulation software.Finally,this paper based on the wireless power transfer system of S-S compensation structure to analyze the frequency bifurcation problem.And using the Neumann formula to analyzed the relationship between coil parameters and mutual inductance and different situation of S21 when using different coil radius.Meanwhile,this paper study the changes of system performance when happening the horizontal offset.It is found that the frequency bifurcation phenomenon can be eliminated by changing the radius of the primary coil,andthe performance of the system is optimized.Besides,the simulation results prove the feasibility of the strategy.