Research On Flexible Arrangement Techniques For Receiver In Magnetic Resonance Coupling Wireless Power Transfer

Wireless power transfer(WPT) technology,as a safe,clean and efficient new power supply technology,has been widely concerned by experts and scholars in various fields in recent years.In the traditional wired energy transmission mode,after a long time of use,the cable will be aging,resulting in leakage,bad contact and other hazards.Messy cables are not only ill-favored,but also inconvenient for life.The application of WPT technology not only gets rid of the limitations of the transmission lines in connection transmission,making power transmission more flexible,but also avoids the shortcomings of the above connection transmission.However,at present,in the field of the WPT,many key technical problems have not been solved yet,thus limiting its development.One of them is that the receiving devices cannot be arbitrarily placed.This thesis aims at two application scenarios: planar receiving device and cylindrical receiving device.By adjusting the amplitude and direction of the magnetic field,the problem that the receiving devices cannot be flexibly placed is improved.The contributions of this thesis are as follows:1.Mutual inductance coupling model is adopted to analyze the system efficiency and working characteristics of four common compensation networks,and the SS compensation network is selected for the WPT system in this thesis.On this basis,the factors affecting the transmission efficiency of the system are studied,and the differences between inductively coupled and magnetically coupled resonance WPT are compared.2.By studying the distribution characteristics of magnetic field generated by coils with different diameters at different heights,the coil design method that achieves a uniform distribution of magnetic field at the receiving plane is proposed.With the method,the coil is designed and optimized by using genetic algorithm.The reliability of the design method is verified by the measured results.3.By investigating the magnetic field direction required by the cylindrical receiving device,a transmitting coil capable of generating desirable magnetic field was designed.By adjusting the phase of the feed current,the blind spot of the magnetic field at the receiver is eliminated.After optimizing the transmitting coil,the receiver can be placed at any angle and position with steady efficiency.4.In order to get closer to the actual situation,we also analyze the effect of a plastic shell of the transmitter,another WPT system,and the desktop with different materials used to mount the transmitter on the transmission efficiency.The results show that all of these three situations have no significant effect on the transmission efficiency.Nowadays,more and more domestic electronic devices are equipped with wireless charging function.The two design methods in this thesis to improve the arrangement flexibility of the receiver can provide new solutions to improve the performance of wireless charging and the use of wireless charging in domestic appliances.