| The traditional cabled power transmission method has many problems such as the circuit is easy to age,easy to cause safety accidents in some special situations,and implantable devices cannot be used conveniently.In recent years,wireless transmission technology is widely used in mobile phones,electric toothbrushes,smart watches and other electronic devices.Moreover,in the smart home,vehicle wireless charging,implantable medical devices,and other fields,wireless energy transfer technologies have a larger application space in the future.It is expected to become the development direction of power transmission in the future.In the research of wireless energy transmission technology,how to make the system play a better transmission performance in engineering application has always been the focus of researchers.This thesis takes the performance optimization of the system as the starting point to design and optimize the coupling coil in the system to improve the transmission performance of the system.The main contents are as follows:Firstly,to investigate the topic background and make clear the research significance,the four common wireless transmission modes and research progress at home and abroad were reviewed respectively and compared the four methods’ characteristics.And then,choosing the magnetic coupling resonant wireless transmission system as the most suitable way for small power mobile electronic devices as the research target.Secondly,to build the equivalent model of the system,and use the circuit knowledge to analyze the principle of the system.On the basis of analyzing the RLC resonant network theory,and the investigation of the output power and transmission efficiency between the SS type,SP type,PP type,and PS type compensation networks,the SS type compensation network structure was selected for this system.Thirdly,the coil component is the most important part of this system,to optimize the performance from the perspective of coils,the shapes and winding modes of the coupling coil are discussed.The parameters of the coupling coil such as resistance,inductance,and capacitance were analyzed,and the mathematical relationship between the structural parameters of the coil and the coupling coefficient K was derived.The coupling coefficient K was taken as the objective function of optimization,and the electromagnetic field simulation was carried out by using Ansoft Maxwell electromagnetic simulation software to determine the coil turns and turn spacing under the high coupling coefficient of the system.Fourthly,in some engineering application scenario,the sending and receiving coils are not complete symmetry,and may not be able to collimate.By mathematical analysis on the coil migration,the combination structure of two series transmitting coil was presented,and the anti-migration characteristics of the asymmetric coil structure were validated.Through simulation,compared with the novel designed coil and the traditional asymmetric coil,the experiment results show that the coil structure proposed in this thesis has better coupling efficiency and improves the transmission performance of the system effectively. |
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