Wireless power transfer (WPT) offers the advantages of convenience, safety, low-maintenance, high reliability, and strong adaptability to the environment. This study proposes a design method to help LCC/S compensation topology achieve zero voltage switching (ZVS), which helps improve the efficiency of the system. The optimisation design of the magnetic coupling structure is conducted first via the finite element simulation software, ANSYS Maxwell. Planar circular coil offers superior comprehensive performance over other structures and is thus utilised in this study, which theoretically analyses the primary characteristics of LCC/S (primary inductor-capacitor-capacitor, secondary series) compensation topology. The study makes an in-depth comparison of two methods for achieving ZVS, adjusting secondary series compensation capacitance, and making a primary T-type network asymmetric. The conclusions of the theoretical analysis indicate that making a primary T-type network asymmetric is the most suitable method for the proposed WPT system. A 400 W prototype was built, and it consistently achieved ZVS operation within the entire load range (5–50 Ω). The highest power transfer efficiency (PTE) achieved by the prototype was 92.9%, and the PTE was consistently above 88% within the entire power range (50–400 W).

中文翻译：

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具有宽工作范围的LCC / S补偿WPT系统的分析，设计和优化

无线电源传输（WPT）具有便利，安全，维护成本低，可靠性高以及对环境的强适应性等优点。这项研究提出了一种设计方法，以帮助LCC / S补偿拓扑实现零电压开关（ZVS），从而有助于提高系统效率。首先通过有限元仿真软件ANSYS Maxwell进行磁耦合结构的优化设计。平面圆形线圈具有优于其他结构的综合性能，因此可用于本研究，该研究从理论上分析了LCC / S（初级电感器-电容器-电容器，次级串联）补偿拓扑的主要特征。该研究对两种实现ZVS的方法进行了深入的比较，分别是调节次级串联补偿电容，并使主要的T型网络不对称。理论分析的结论表明，使主要的T型网络不对称是提出的WPT系统的最合适方法。建造了一个400 W的原型，它在整个负载范围（5–50Ω）内始终实现ZVS操作。原型实现的最高功率传输效率（PTE）为92.9％，并且在整个功率范围（50-400 W）中，PTE始终高于88％。