基于补偿网络电流分析的恒压恒流无线充电系统
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厦门大学仪器与电气系

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基金项目:

国家自然科学基金面上项目(62071406)


Research on Load-independent Characteristic Based on Current Analyzation of Compensation Network
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Affiliation:

1.Instrumental &2.Electrical Engineering Department Xiamen University

Fund Project:

Project Supported byGeneral program of National Natural Science Foundation of China

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    摘要:

    为了避免民用飞机机载设备与电源插拔过程中带来电火花的危险,并提高设备充电的便利性,本文采用无线充电方式为其进行供电。在恒压恒流无线充电系统中,补偿网络支路电流大小不仅决定功率器件成本,也与系统损耗直接相关。因此,对补偿网络电流优化,是实现高效无线电能传输的重要途径。本文首先分析了低阶网络的回路电流关系,得到了回路电流最小的条件,进一步推广到高阶网络,获得最优补偿网络电流一般性方法。其次,在分析原副边完全对称补偿网络具有实现恒压或恒流的基础上,得到一系列恒压恒流拓扑,并结合最优补偿网络电流方法对拓扑进行参数设计,同时采用原边电流检测方法进行恒压恒流切换,避免了原副边之间的通信。最后,通过仿真和实验验证电流优化方法和负载无关实现方法,结果表明,所述拓扑具有很好的恒压恒流输出特性,同时电流优化方法能大幅度减小回路电流应力,从而提高系统传输效率。

    Abstract:

    In order to avoid the risk of spark between the civil aircraft and other equipment, and improve the convenience of charging, this paper uses wireless power transfer to supply power for it. In the wireless charging system of constant voltage and current, the compensation network branch current not only determines the cost of power devices, but also relates to the system loss. Therefore, the optimization of compensation network current is an important way to improve efficiency of system. In this paper, the loop current of low-order network is analyzed, and the condition for achieving minimum current is given. And the general method of optimal compensation network current is obtained. Then, on the basis of analyzing completely symmetrical compensation network which can realize constant voltage or constant current, this paper deduces a series of topologies. Next, combined with loop current optimization conditions, the parameters of the constant voltage and constant current topology are designed. At the same time, the charging mode change is achieved by using the primary side current detection method. Finally, the current optimization method and the load independent implementation method are verified by simulation and experiment. The results show that the proposed topology has good performance of constant current and constant voltage output. And the current optimization method can greatly reduce the circuit current stress, and improve the system efficiency.

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  • 收稿日期:2022-06-21
  • 最后修改日期:2022-08-23
  • 录用日期:2022-08-18
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