Performance Optimization And Experiment Of Wireless Power Transmission System With Low Frequency

The subject design a wireless power transmission system with lowfrequency less than10kHz, the output power of the system reaches3KW, themaximum transmission efficiency is more than80%while the wirelesstransmission distance is8cm to10cm. The basic theory of the wireless powertransmission is derivated using mutual coupling model. The effectivetransmission distance is calculated as the subject requires to improvetransmission distance while the system uses lize wire. and get the formula toanalyze the impact of various parameters on the effective transmission distance.Theoretical calculation helps to understand the system better, also can effectivelyguide the design and build of the actual system.In order to finish circuit design, digital control chip is used to controlfrequency which can improve the reliability and accuracy of system. Thefull-bridge inverter circuit is used to improve efficiency. As the system workingat low frequencies and large output power, IGBT is chosen to be switching devicein inverter circuit, also choose an appropriate driver module and the externalbuffer circuit to make IGBT work properly. Besides, the power parts of thewireless transmission system are analyzed to determine the capacitance type andinductor material. Using simulation software to simulate turns selecting theappropriate coupling coefficient according to the result, and made a circuitsimulation to get the power and efficiency of the system affected by primary andsecondary inductance values, and then get the best primary and secondary sideinductance value which greatly improves the system performance. Value of theload is also obtained from the simulation to avoid frequencies bifurcation.In order to compare the different characteristics of the system with naturalfrequency, systems with different structures under different natural frequency aresimulated and get three-dimensional graphics of each system to compare systemperformance. According to the previous conclusion, further simulation aboutcoupling coefficient and load to achieve their influence. Consider theinconvenience of the actual experimental operation, simulate the initial start-upof system to get the start-up current waveform. The waveform should be considered while choosing the switch model in order to ensure the security ofsystem.The parameters of the actual system is given at last and do variousexperiments to obtain the system features, including boost, sweeping frequencyand changing load at different distances and some further experiments to get thesystem the basic characteristics. In addition, the natural frequency of the systemis changed to achieve corresponding experimental curves and analyze the results.