Research And Implementation Of Wireless Power Transmission System With Receiver Position Independence

Wireless power transmission technology is one of the hotspots of modern research.Among them,the magnetic coupling resonance wireless power transmission(MCR-WPT)has a long transmission distance and strong anti-interference ability.However,when the alignment of the transceiver coil deviates,its output power and transmission efficiency will still be greatly reduced,which will seriously affect the system performance.And changing the structure of the transmitting coil is one of the important methods to realize the anti-offset characteristic.This paper makes an indepth study on the above problems,and the specific work is as follows:Firstly,this paper analyzes the current mainstream traditional resonant system and omnidirectional transmitting coupling system,points out the shortcomings,and proposes a design idea to improve the coil structure.That is,the traditional plane transmitting coil is improved,and the folded transmitting coil and butterfly double-D transmitting coil model with adjustable opening and closing angle are constructed.Secondly,this paper uses the two simulation software ANSYS HFSS and Designer to conduct co-simulation to optimize the geometric parameters of the folded coil and the butterfly double-D coil.The specific process is as follows.In the simulation,the WPT system of the folded coil and the butterfly double D coil is built respectively,and the S21 value of the system is obtained by simulation,which is proportional to the transmission efficiency of the system.In the simulation,the geometric parameters of the coil are adjusted so that the efficiency is the highest(S21is the largest),so as to obtain the optimal parameters of the transmitting coil.Then,in the simulation,the receiving coil is moved along the three directions of X,Y,and Z axes,and the transmission efficiency is estimated by the S21 value of each position point,and the receiving position independence of the WPT system is investigated.Thirdly,the SS-type circuit topology was built,and the T-type equivalent and theoretical solutions were obtained for the loosely coupled coil inside,and the entire circuit system was simulated with the RF simulation software ADS to prepare for the construction of the physical system.Afterwards,Altium Designer software was used to design the PCB circuits required for the transmitter and receiver,and the plane coil,folded coil,butterfly double-D coil and receiver coil were manually fabricated using Litz wire,and three sets of wireless power transmission systems were constructed,and then carry out the experiment of the displacement change of the receiving coil to verify the theoretical analysis and simulation results.The simulation and experimental verification show that the anti-offset characteristic of the butterfly double-D coil is the best,and the position independence is achieved to a certain extent.And at the coaxial distance of 10 cm between the butterfly-shaped double-D transmitting coil and the receiving coil,the power transmission efficiency of the system is 48.7%,and the experimental and simulation results are basically consistent.