To balance the output stability and maximum efficiency of a system, an efficiency optimization method based on adaptive frequency control is proposed. In this paper, load transmission is carried out using a DC–DC converter at the receiving end. When the load changes, controlling the rectified output voltage is carried out to realize the maximum efficiency point tracking. Meanwhile, the duty cycle of the rear stage DC–DC converter is changed to keep the output voltage constant. The sampled rectified voltage is compared with the estimated value and the resulting error data are sent to the system transmitter through ASK modulation wireless communication. Then the transmitter demodulation communication information through PID algorithm control is used to achieve the frequency of the adaptive adjustment. The feasibility of the proposed method has been verified by the simulation and experimental results. When the output voltage is 5 V, the constant voltage accuracy is within ± 1%, the maximum efficiency is up to 79.2%, and the dynamic response time is only 160 ms.

中文翻译：

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高效优化的无线电力传输系统设计

为了平衡系统的输出稳定性和最大效率，提出了一种基于自适应频率控制的效率优化方法。在本文中，负载传输是在接收端使用 DC-DC 转换器进行的。当负载变化时，控制整流输出电压，实现最大效率点跟踪。同时，改变后级 DC-DC 转换器的占空比以保持输出电压恒定。将采样的整流电压与估计值进行比较，将得到的误差数据通过 ASK 调制无线通信发送到系统发射机。然后利用发射机解调通信信息通过PID算法控制，实现频率的自适应调整。仿真和实验结果验证了所提方法的可行性。输出电压为5V时，恒压精度在±1%以内，最高效率高达79.2%，动态响应时间仅为160ms。