| The dynamic wireless power transfer(WPT)technology of electric vehicle(EV)is an effective way to solve the problem of heavy body,short battery life and difficulty in charging.The real-time control and system status monitoring of EV positioning and transmitting coil switches is an important part of this technology.On the basis of fully researching the development status of EV WPT technology,the basic principle of the WPT system is briefly analyzed,and the basic structure of the WPT system of EV is introduced from the ground equipment and the vehicle equipment respectively.In the ground equipment system,in addition to high-frequency power supplies,but also includes a series of EVs along the road laying a separate transmitting coils,the equivalent of direct power to the EV power supplies,the so-called dynamic,that is,real-time switching EVs at the location of the transmitting coils.The positioning detection of EVs is one of the difficulties in realizing dynamic WPT.The thesis enumerates several technologies that can realize vehicle positioning,and selects the magnetic positioning detection technology,then analyzes the basic principle of the technology.In the aspect of hardware,magnetic core and magnetoresistive sensor are used as the core components,the magnetic field distribution characteristics of the magnetic nail and the basic principle of the magnetoresistive sensor are analyzed.The components selection is finished and the signal conditioning circuit is designed.In the software,the design of the transverse/longitudinal magnetic field matching and the control algorithm of the transmitting coil switches are designed.In the thesis,MATLAB/Simulink simulation is used to verify the influence of transmitting coils switching control on system stability.Finally,the magnetic positioning detection system is applied to the demonstration platform of dynamic WPT system of EV,and the joint experiment is carried out. |
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