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LCCL-LC Resonant Converter and Its Soft Switching Realization for Omnidirectional Wireless Power Transfer Systems
IEEE Transactions on Power Electronics ( IF 6.7 ) Pub Date : 2021-04-01 , DOI: 10.1109/tpel.2020.3024757
Junjie Feng , Qiang Li , Fred C. Lee , Minfan Fu

Recently, omnidirectional wireless power transfer (WPT) systems have been studied intensely, due to their improved flexibility as compared to their planar counterparts. The LCCL-LC resonant converter topology is selected due to its current source characteristics in this article. The system frequency is pushed to megahertz (MHz) to increase the spatial charging freedom. In a megahertz WPT system, the reactance of the full bridge rectifier can no longer be neglected; therefore, an analytical model of the full bridge rectifier input impedance is built. Furthermore, zero-voltage switching (ZVS) of the switching devices is essential in reducing the switching loss and noise in a megahertz system. A design methodology of the LCCL-LC circuit is proposed to achieve the ZVS operation in the case of one transmitter and one receiver. Then, the ZVS analysis is extended to the scenario of multiple transmitter coils and one receiver coil. Finally, a 6.78-MHz wireless charging system is built according to the proposed design methodology. Experimental results validate the accuracy of the ZVS analysis, and the ZVS operation is well achieved under different coupling and load conditions. The peak system efficiency of 82% at 5-W output power is achieved.

中文翻译:

LCCL-LC谐振变换器及其用于全向无线电力传输系统的软开关实现

最近,由于与平面对应物相比具有更高的灵活性,全向无线电力传输 (WPT) 系统得到了广泛的研究。由于本文中的电流源特性,因此选择 LCCL-LC 谐振转换器拓扑。系统频率被推到兆赫兹 (MHz) 以增加空间充电自由度。在兆赫WPT系统中,全桥整流器的电抗不能再忽略;因此,建立了全桥整流器输入阻抗的解析模型。此外,开关器件的零电压开关 (ZVS) 对于降低兆赫兹系统中的开关损耗和噪声至关重要。提出了一种LCCL-LC电路的设计方法,以在一个发射器和一个接收器的情况下实现ZVS操作。然后,ZVS 分析扩展到多个发射线圈和一个接收线圈的场景。最后,根据所提出的设计方法构建了一个 6.78-MHz 无线充电系统。实验结果验证了 ZVS 分析的准确性,并且在不同的耦合和负载条件下都能很好地实现 ZVS 操作。在 5W 输出功率下实现了 82% 的峰值系统效率。
更新日期:2021-04-01
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