| Magnetic coupling resonant wireless power transfer technology is a kind of power transmission technology without directing connection of conductor lines.Compared with wired power transmission,wireless power transfer technology is safer and more reliable,especially in some explosive mine oil well and underwater environment.And it plays a huge role in implantable medical-electronic equipments and related applications,so magnetic coupling resonant wireless power transfer technology has great scientific significance.This paper starts from researching the application of implanted devices’ wireless power supply,to study the improvement of magnetic coupling resonant wireless energy transmission efficiency.Firstly,the circuit model of magnetic coupling resonant wireless energy transmission system is analyzed,and the complete and simplified circuit model of two-coil and four-coil system is established.The influence of coil quality factor and coupling coefficient on system performance is analyzed,and the four coil resonance system is compared to the two coil resonance system.In addition,in view of the four kinds of capacitance compensation structure analyzes the advantages and disadvantages of each.Then,for the two-coil wireless power transmission system implemented by the Printed Circuit Board(PCB),the optimum operating frequency of the system is found by establishing the analytic model of inductance,parasitic resistance and parasitic capacitance of the coil,and it was verified by experiment and simulation.Finally,based on the wireless power supply system for Implantable Devices for Neuron Signal Acquisition in Brain-Computer Interface,the size and operating frequency of the millimeter-sized receiving coil in the form of solenoid are studied.Simulation and experimental results show that when the AWG36 copper wire is used,the number of turns of the 1-mm receiving coil is 6,and the distance between the adjacent coils is 0.2326 mm.The optimal operating frequency of this structure is 700 MHz. |
PDF Full Text Request