Design And Implementation Of Interleaved Anti-offset Wireless Power Transfer System On Magnetic Resonance

Compared with the traditional wired power transfer,Wireless Power Transfer technology has become a research hotspot because of its higher security and lower maintenance cost.It has broad application prospects in electric vehicle,mobile device and digital home.When the transmitting and receiving coils are strictly aligned or the transmission distance is short,the wireless power transfer has high transmission efficiency.However,in practical applications,the coupling mechanism may have horizontal offset or the transmission distance may change,resulting in output voltage fluctuations and efficiency reduction.Therefore,the research on horizontal offset and transmission distance is of great engineering value for wireless power transfer technology.In order to improve the ability of anti-offset and increase the transmission distance,an interleaved parallel half bridge wireless power transfer system on magnetic resonance is designed based on double transmitters to single receiver structure.At the same time,in order to achieve soft switching and constant voltage output,double LCCL-S compensation network is used in the system,and a 200 W experimental prototype is built for verification.Firstly,this dissertation briefly summarizes the research status and development trend of anti-offset and long range transfer in wireless power transfer technology,introduces the characteristics of each part of the wireless power transfer system,and determines the basic composition of the system.The key waveforms and basic working principle of the system are given,and the interleaving mode of the system is analyzed in detail,which shows that the system has the condition of soft switching.Secondly,the system is modeled based on the circuit theory,and the transmission and coupling characteristics of the system are analyzed.According to the circuit model,the output constant voltage characteristic of the system is analyzed.The MATLAB software is used to draw the correlation curve,and the change of transmission power with different resonant inductance and coupling coefficient is analyzed.HFSS software is used to simulate the coupling mechanism,and the magnetic field characteristics of the transmitting coil are analyzed.It is concluded that the double transmitting coils has a wider magnetic field area.Based on the analysis of system characteristic,the software and hardware of the system are designed.The design of resonant compensation circuit,the selection of power device and the design of control circuit are given in hardware design.The configuration of each functional module are given in software design.TMS320F28035 is taken as the control core to build an experimental prototype with transmission power of 200 W.Finally,the circuit simulation model is built by saber software,and the simulation results preliminarily verify that the system has constant voltage output characteristic.On this basis,the experimental test platform is built.The anti-offset experiment and the contrast experiment with single transmitter to single receiver WPT system are carried out.The experimental results show that the system has the ability of anti-offset and has a longer transmission distance than the single transmitter to single receiver WPT system.