| With the development of modern electronic technology,people's demand for all kinds of mobile electrical equipment is gradually increasing,ranging from electronic watches and mobile phones to the charging of electric vehicles,rail transit,spacecraft,etc.,which have realized the transformation from theoretical research and development to practical application.The traditional wired charging method has limitations in the charging process,which brings trouble and danger.In this dissertation,the influence of different angles and distances between two transmit coils on the transmission characteristics of the system is studied in detail.First of all,the basic principle and types of wireless energy transmission are analyzed in this dissertation,and the wireless energy transmission system with single emitter structure for resonance analysis is selected,and the principle of transmission mechanism of series-series(S-S)and parallel-parallel(P-P)resonant compensation structures is studied through comparison of circuit model and mathematical derivation.Therefore,the topology of the resonant circuit of the dual transmitter is determined to be s-s-s,and the circuit principle of dual transmitter single receiver is analyzed,and the magnetic field of three coil structures is analyzed by using finite element analysis software(Ansoft Maxwell),and the solenoid coil structure is selected finally according to the distribution of magnetic field.Secondly,the equivalent model of the dual transmitting coil system is derived from the single transmitting coil system,and the dual transmitting coil system is modeled using circuit theory.At the same time,the impedance analysis method is used to analyze the influence of the mutual transmitting coil mutual inductance on the system,and adding additional compensation capacitors is proposed to eliminate the influence of mutual inductance.After analyzing the influence of other parameters on the system,the mutual inductance model between the three coils is established,and the output power and transmission efficiency model of the dual transmitter system are derived.Aiming at the basic requirements of the dual transmitting coil system,a frequency conversion control method based on the primary phase-locked loop is proposed to achieve high efficiency and stable transmission of wireless energy.At the same time,a DC-DC conversion circuit is used on the receiving side to realize voltage regulation control to meet the load power supply.MATLAB and PSPICE are used for simulation analysis,the influence of the three coil position changes and the received load changes on the system performance is obtained.Finally,the device selection,hardware design and software programming of the system are carried out,and the experimental platform of wireless energy transmission with dual emission sources is built.Experiments were conducted on the performance of the system from the compensation capacitor,the angle between the transmitting coils,the transmission distance,and the load change. |
PDF Full Text Request