| Inductively power transfer(IPT)technology realizes the non-contact transmission of electric energy by means of electromagnetic field near-field coupling.Compared with traditional contact power supply,this technology has many advantages such as safety,flexibility and convenience.It has been widely used in portable electronic devices,human implantable devices and other fields.However,with the commercialization of high-power electrical equipment such as electric vehicles,rail transit,and AGVs,the traditional inverter power supply using analog control has been unable to meet the needs of the above-mentioned wireless equipment for charging speed and intelligent control.Therefore,it is necessary to conduct in-depth research.The topology structure and control strategy of inductive inverter power supply can improve the problems of low power capacity,poor output accuracy and low degree of digitization.First of all,this paper analyzes the working principle of inductive wireless power transmission based on high-power application scenarios,and establishes the circuit equivalent model of the S-S compensation structure,and obtains the main parameters affecting the power capacity of the power supply and the transmission performance of the system;here On this basis,the pros and cons of different main circuit topologies and power control methods are deeply explored.In order to further improve the efficiency of the whole machine,this paper analyzes the soft switching implementation methods of the main circuits at all levels in detail,and formulates the power supply design optimization.Program.Secondly,the hardware parameters of the main circuit and control circuit are designed for the high-power inductive wireless power transmission inverter power supply according to the optimized scheme,and the selection basis of each component is introduced in detail;in order to reduce the loss of the main circuit switching devices,the Buck chopper is used The working principles of the circuit and inverter circuit are discussed and the design of soft switching parameters is completed.In view of the problem that the transmission performance is reduced in the case of system detuning,a frequency tracking circuit based on CD4046 phase-locked loop is designed to realize the phase between the voltage and current of the transmitting coil.locking.Then,a simulation model is built to verify the rationality of the main circuit design and the effectiveness of the control strategy,and the system software design is completed by combining the simulation results and the on-chip resources of the DSP digital chip.Finally,based on the high-power practical application scenario,a 30 k W inductive wireless power transmission system is designed and built,and then debugging and experiments are carried out.The experimental results show that the drive circuit is reasonably designed and can effectively drive IGBT switching devices.The power supply has stable output under rated power and can be precisely adjusted.When the relative displacement of the coupling mechanism causes the system to detune,the frequency tracking circuit can accurately adjust the transmitter voltage.,The phase of the current is locked to make the circuit work again in the weak inductive quasi-resonant state,so that the transmission efficiency of the inductive wireless power transmission system can still be maintained at 90%. |
PDF Full Text Request