Analysis And Research On Magnetically Coupled Resonant Wireless Power Transmission Circuit

In order to realize the requirement of long-term continuous uninterrupted work in the field of mobile online monitoring mobile devices and other ultra-high voltage lines,combined with current transformers to induce energy,wireless power supply for mobile power equipment on ultra-high voltage transmission lines.Firstly,according to the application background,the design indicators and application architecture of the wireless energy transmission system are determined.Based on the A4WP requirements for radio energy transmission,some design specifications of the high frequency inverter are determined.The common high-frequency transformation topologies class D,class?₂ and classE are compared.The topology structure of class E is selected as the topology of the system,and the experimental platform is built based on the topology.The rules of class E parameters affecting input power and ZVS working state are summarized.When V_in and D are roughly determined,the output power is mainly adjusted by L_r and C_r.The parallel capacitance C_s of the switching tube mainly affects whether the switching transistor can realize ZVS.Determine the basic structure of the resonant coil and the way the capacitor is compensated.With the aid of the simulation software HFSS,the influence of the parameters of the planar spiral coil is analyzed.In order to obtain a planar spiral coil with a high quality factor Q_c,the appropriate number of parallel current paths N_b should be selected to reduce the number of turns of the coil as much as possible.Small peripheral area S_e,larger line width w.The influence of the axial forward distance and the axial deflection distance on the mutual inductance is analyzed when the two coils resonate:the influence of the axial deflection distance d₂ on the mutual inductance k is only significant when the axial forward distance d₁ is small.Then select the appropriate capacitor compensation method according to the current or voltage characteristics of the front and rear stage circuits.The circuit was verified experimentally.Based on the above analysis and the completion of the experimental prototype production,and the experimental demonstration,the experimental results verify the rationality and effectiveness of the design.Finally,a prototype was implemented to prove the correctness of the design method.