| With the depletion of non-renewable energy sources,the atmospheric environmental pollution becomes more and more serious.Conservation of energy consumption and reduction of emissions ha've gradually become the consensus of all mankind.In the field of transportation,electric vehicles are driven by clean energy,with high energy utilization and pollution-free.They have been strongly supported by national preferential policies and favored by the market,and have developed rapidly in recent years.At present,electric vehicles are generally charged by wired charging method with electrical connection.This charging method generally uses charging gun to realize the transmission of electric energy from the grid to the battery of electric vehicles.However,with the increase of using time,electrical connections are prone to mechanical wear and tear,and electric sparks will be generated during charging process,which will lead to safety problems in charging process.In addition,this charging method uses charging gun to realize the transmission of electric energy from the grid to the battery of electric vehicles.Wire charging also needs to be equipped with a large area of dedicated site,charging process requires manual duty,vulnerable to bad weather.Wireless charging method solves these defects of wired charging.It has the advantages of safe charging,convenient charging,no need of electrical connection and intelligent control.It can effectively promote the large-scale popularization and application of electric vehicles.At present,the main radio power transmission technologies are electromagnetic induction,magnetic coupling resonance and radio wave.These three kinds of-radio power transmission technologies differ greatly in transmission power,transmission efficiency and transmission distance due to their different working principles.Among them,the magnetic coupling resonance radio power transmission technology is especially suitable for the field of electric vehicle wireless charging because of its high transmission power,high transmission efficiency and moderate transmission distance.Based on the principle of electromagnetic resonance.this paper studies the principle of electromagnetic coupling resonance wireless charging system for electric vehicles,establishes a model and simulates it,which provides theoretical guidance for the design of wireless charging system for electric vehicles.Mainly do the following aspects of research:(1)Research on the principle of radio energy transmission and magnetic coupling resonance radio energy transmission.The system structure,transmission characteristics and application occasions of electromagnetic induction,magnetic coupling resonance and radio wave transmission technologies are compared and analyzed.Based on the theory of mutual inductance coupling,the transmission mechanism of the magnetic coupling resonant radio power transmission system is analyzed,and the mutual inductance coupling model is established.Four kinds of resonant compensation structures of the magnetic coupling resonant radio power transmission system are compared and analyzed.(2)Magnetic field simulation analysis of electromagnetic coupling coil.Using Ansoft/Maxwell simulation software,the model of flat-plate magnetic core type coupling coil is established,and the effects of magnetic core,transmission distance and coil offset on the coupling magnetic field are analyzed.(3)Circuit simulation analysis of electromagnetic coupling resonance wireless charging system for electric vehicle.The simulation circuit is built by using MATLAB software,and the load resistance,coupling coefficient and working frequency characteristics of the charging system are analyzed.The influence of each parameter on transmission power and efficiency of the electromagnetic coupling resonance wireless charging system of electric vehicle is studied,which provides theoretical support for the design of the wireless charging system of electric vehicle. |
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