Research On Coupling System Design Method And Radio Energy Transmission Characteristics Based On Asymmetric Structure

With the advent of the electrical age,human dependence on electricity has also gradually increased.While meeting the demand for electricity,new ways of transmitting electricity is proposed by people.Wireless power transfer technology gets rid of the complicated electricity lines.With the advantages of safety and flexibility,it is seen as the research focus by scholars at home and abroad,and has a broad application prospect.Wireless power transfer has been widely used in many fields,such as household appliances,implantable medical devices,electric vehicles,wearable devices,etc.The wireless power transfer technology based on the resonance principle complete power transfer in the middle distance.Taking into account practical applications,because of the limitation of the occasion,the size of the transmitting and receiving devices of the resonator tends to be differences.It is an unavoidable problem that asymmetric coupling coil is designed and its transmission characteristics is summarized.Firstly,the circuit model of asymmetric wireless power transmission system is constructed.It is practical problem that asymmetric system has many parameters and they are coupling.The relationship between the system receiving power,transmission efficiency and distance is deduced,they are affected by frequency and mutual inductance respectively.Therefore,two characteristics of asymmetric system frequency and distance is concluded,through analyzing the working frequency and coupling coil mutual inductance.Secondly,physics simulations of COMSOL Multiphysics are performed in the article.Different size of the resonant system simulation is designed,it is concluded that the law of system parameters influences on the distance characteristics.At the same time,under different distances,Change the angle of the coupling system with size ratios of 2:1 and 5:1 respectively and the law of direction characteristics the asymmetric coupling system are concluded.Thirdly,the design problem of asymmetric coupling coils is considered.In this paper the power transfer effects of three kinds of shapes:flat circular,flat square and spiral cylinder respectively are compared based on the COMSOL model.At the same time,the influences of the parameters of wire diameter,size and turn spacing on the quality factor are summarized,which provides a theoretical basis for the future design of the coil.Finally,based on the simulation model,an asymmetric resonant system is set up for experimental verification.By changing the parameters of frequency,distance,angle and resonance system,the correctness of the simulation of an asymmetric coupled system is verified.At the same time,through constructing of different resonant systems,the law that coil parameters affect quality factor is verified correctly.