This article presents the analytical modeling of synchronous class E rectifiers with the load-independent operation, which achieves zero-phase-angle input impedance, soft-switching over the entire load range with a constant voltage gain. The optimal design of the synchronous class E rectifier is proposed to realize both zero-voltage-switching turn- on and zero-current-switching turn- off at the expected output power. An $ LCC$ - $S$ compensated MHz-WPT topology, which comprises the push–pull class E inverter and rectifier with the load-independent operation, is proposed to achieve the fully soft-switching and a nearly constant voltage gain over the entire load range. The efficiency improvement of the compensation network is also investigated to provide a design methodology for the proposed topology. A $ 6.78$ -MHz WPT prototype, along with an alternative phase detector using an auxiliary coil to realize phase detection, is built to validate the analytical model and the proposed methodology. The system efficiency reaches $ \text{86.7}\%$ at $ 214$ -W output. The synchronous push–pull class E rectifier maintains soft-switching over the load range, and the rectification efficiency reaches $ 94.6\%$ .

中文翻译：

---

具有负载无关操作的同步推挽E类整流器，用于兆赫兹无线功率传输

本文介绍了与负载无关的同步E类整流器的分析模型，该模型实现零相角输入阻抗，在整个负载范围内以恒定电压增益进行软开关。提出了同步E类整流器的优化设计，以实现零电压开关转 上 和零电流开关匝数 关以预期的输出功率。一个$ LCC $ -- $ S $为了在整个负载范围内实现完全软开关和近乎恒定的电压增益，提出了一种补偿型MHz-WPT拓扑，其中包括推挽E类逆变器和具有与负载无关的操作的整流器。还研究了补偿网络的效率提高，以为所提出的拓扑提供一种设计方法。一个$ 6.78 $ -MHz WPT原型，以及使用辅助线圈实现相位检测的替代相位检测器，旨在验证分析模型和所提出的方法。系统效率达到$ \ text {86.7} \％$ 在 $ 214 $ -W输出。同步推挽E类整流器可在负载范围内保持软开关，整流效率达到$ 94.6 \％$ 。