| The power transmission form is more and more strictly required in technology,while the power application field is rapidly expanded.The wireless power transmission technology is free from the constraint of power cable.Then,the wireless power transmission technology is safe and convenient.The application field of power has been greatly expanded by the wireless power transmission technology,which is the key direction of power transmission reform.The magnetic coupling resonance wireless power transmission technology has the technique superiority of longer transmission distance and higher transmission efficiency compared to other wireless power transmission methods,which has become a research hotspot and research frontier in this field.However,there are still some problem such as the selection of compensation topology,the system constant current / constant voltage output,and the optimized design of the coupling coil shape,to be solved in the application of the magnetic coupling resonance wireless power transmission technology.These problems have been solved in this dissertation.The main research contents are as follows:A hierarchical solution is proposed in this paper for the selection of system compensation topology.The four compensation topologies are firstly modeled based on circuit theory.The parameter expressions of system output power,transmission efficiency and load current,are constructed based on resistance,coupling coefficient and system frequency.The transmission performance of string-string(SS),parallel-parallel(PP),parallel-string(PS)and serial-parallel(SP)compensation structures are achieved by the theory analysis and simulation verification of multi-parameter expressions.The optimal load resistance and coupling coefficient are derived by the maximum principle.The validity of the proposed method is verified by the circuit simulation finally.A novel LCC-P / S compensation topology is proposed to solve the problem ofthe constant current / constant voltage output of the transmission system.The circuit structure modeling of the compensation structure of LCC-P and LCC-S.The LCC-P and LCC-S compensation structures are modeled in circuit system.The function expressions of load current,load voltage,system output power and other relevant system parameters are constructed.The correction of function is verified by the simulation experiment.The simulation results show that the constant current transmission can be achieved by the LCC-P compensation topology,and the constant voltage transmission can be achieved by the LCC-S compensation topology.A method based on the mutual inductance of coupling coil shape,is proposed for the optimization of the shape of coupling coils.The equivalent models of coupling coils with different shapes are constructed firstly in the method.The coupling mutual inductance expressions of circular-circular coils,square-circular coils,and square-square coupling coils,are derived by the electromagnetic theory.Electromagnetic simulations in the deferent cases of axial displacement,radial displacement and space rotation,are done for all the combinations of coupling coils.The dynamic relationship between the relevant parameters and the mutual inductance of the coupling coils is achieved finally.It can be seen from the dynamic relationship that the circular-circular coupling coil has the best system transmission performance.In addition,the characteristic analysis of the barrier medium of the coupling coil is done.The main concentration is on the metal barrier medium and the non-metallic barrier medium.The relevant experiment platform is built for the experiment verification and analysis. |
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