【作者】 张峰；

【导师】 王慧贞；

【作者基本信息】 南京航空航天大学 ， 电力系统及其自动化， 2007， 硕士

【摘要】 松耦合感应电能传输技术是一种基于电磁感应耦合理论、现代电力电子能量变换技术及控制理论于一体的新型能量传输技术。该技术实现了供电线路和用电设备之间无物理连接下的能量传输。本文选取全桥谐振变换器作为主电路拓扑对松耦合能量传输技术进行了理论分析及实验。首先,文中对松耦合感应能量传输方式的特点、研究现状和发展趋势予以介绍。并对这种新型传输方式在大功率汽车充电系统中的应用进行了介绍。然后对影响变换器性能、系统效率及功率传输能力的松耦合变压器进行了研究。提出了一种优化的松耦合变压器绕组绕制方案,并基于ANSYS仿真环境对这种优化绕法方案进行了仿真,同时给出实验测试结果,仿真和实验结果验证了以上分析。变压器原副边磁芯间大气隙的存在会增加开关管的电压电流应力,影响功率传输能力和系统效率。通过合理的补偿并辅以适当的控制可以很大弥补因气隙较大而造成的功率传输受限等问题,从而达到良好的功率传输的目的。但因补偿电路的加入,使系统为多阶系统,很可能出现频率分叉的不稳定现象,在频率分叉机理研究的基础上,本文给出避免系统出现分叉需满足的条件。除松耦合联接的变压器外负载的变化也是影响变换器性能及控制的重要因素之一。在对采用不同补偿拓扑时的负载特性进行研究的基础上,又给出对比分析,从而归纳出各种补偿拓扑的优缺点及适用场合。最后,制作了基于松耦合变压器的全桥谐振变换器样机,给出了各种情况下变换器的功率传输能力与系统效率的测试结果,并进行了对比说明,从而验证了文中的理论分析及结论。更多还原

【Abstract】 Loosely coupled inductive power transmission is a novel power transfer technology, which is based on electromagnetism and coupling theory, modern power transform technology. And it realizes the non-contact power transfer between power source and load equipment.The paper selects full-bridge resonant converter as the main topology and gives theoretical analysis and experimental verification of this novel technology.Firstly, the characteristics, present status, and research direction of loosely coupled inductive power transfer technology are presented. And the application of this technology to high power electric vehicle charging is given.Secondly, the loosely coupled transformer, which acts as the interface between take-apart primary source and secondary load, is studied. The influence of loosely coupled transformer on power transfer capability, over all efficiency and system performance is analyzed. And a novel winding strategy is put forward, and it can provide a larger coupling factor than conventional winding strategy. The simulation analysis based on ANSYS Emulation environment and test results validate the feasibility of the novel winding strategy.The large gap in loosely coupled transformer brings a high stress on the switch, and impacts power transfer capability, and thus reduces the overall efficiency. Through analysis, proper compensation can reduce the above-mentioned influences of the large gap to an accepted level, and increases the feasibility of this novel power transfer means.Due to the addition of the compensation units, the bifurcation phenomenon probably appears, and the system goes into the unsteady state. Thus, the bifurcation is analyzed in detail, and the conditions avoided the bifurcation is deduced.Similar to loosely coupled transformer, the load change also has a great influence on system control and performance. Through comparison, the characteristics of full-bridge converter with load under different compensation strategies is revealed, and it provides a guideline to the proper choice of compensation topology for different applications.Finally, a prototype of full-bridge converter with loosely coupled transformer is fulfilled. The power transfer capabilities under different conditions are characterized, and the overall efficiency is also given, which verify the correctness of the analysis and the conclusion given in previous chapter.更多还原