| With the rapid development of economy,people put forward higher requirements for convenient,beautiful and more flexible power supply mode of electrical equipment.Therefore,Wireless Power Transmission technology without using charging lines for power supply came into being.Because this technology abandons the traditional wired power supply mode and meets people’s demand for convenience,beauty and safety,it has been paid attention to by the public.Moreover,this technology has been applied in many fields,such as portable electronic products,implantable medical devices and so on.The characteristic of the Wireless Power Transmission technology is that it integrates a new type of power transmission technology with multiple disciplines and strong intersection.This technology can well overcome the shortcomings of the traditional wired power supply mode,such as poor sensitivity,bad appearance,easy to form contact sparks,exposed power lines,etc.,and make the stable transmission of power more flexible and safe.At the same time,the Wireless Power Transmission system is a typical system with complex parameters and easy to detuning.In the practice of research and development,it also faces the following problems: the system modeling and analysis of the resonant Wireless Power Transmission system is very complex,the complex design of the coupler of the resonant Wireless Power Transmission system,the influence of the coupler’s offset characteristics on the system parameters,the selection of the system’s control strategy etc.In order to solve these problems,the following work has been done in this paper:1.The four compensation systems of this technology are analyzed by using circuit knowledge,and the mathematical expressions of the compensation capacitance of the four compensation structures are obtained.The series series compensation capacitance model that is not affected by the parameters of the receiver and the transmission mode is obtained by comparing the formulas.The change curves of various parameters of the system are obtained by using MATLAB simulation program.2.A coupling device of the system within the specified parameter range is designed.The finite element simulation is carried out from the influence of changing the turn pitch,outer diameter,coil turns,layer spacing and layers on various system parameters.The influence of the above parameter changes on the mutual inductance value and other parameters is obtained.The coupling devices with good characteristics within the preset range are selected through comparison.3.Based on the establishment of dislocation coupling magnetic field and mutual inductance model,the spatial magnetic field distribution and mutual inductance characteristics of longitudinal dislocation,transverse dislocation and angular dislocation are analyzed through simulation results,and the influencing factors and rules of the transmission efficiency of the system due to the spatial position changes of the transmitter and receiver are obtained.The optimization method of relay coil is proposed to analyze the offset characteristics of the coupler model with relay coil,and the optimal coupling range of the coil is obtained.4.In the aspect of control strategy of Wireless Power Transmission system: a control strategy is used to find the optimal efficiency point of the system by using the equivalent impedance of the secondary side of the control system and a fuzzy algorithm module is added to realize the tracking of the optimal efficiency point of the system.Figure [52] Table [39] Reference [77]... |
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