To achieve an individual and continuous power distribution for multireceiver wireless power transfer (WPT) systems, a novel multifrequency modulation method has been proposed. In the proposed method, a look-up table and delta-sigma modulation scheme are introduced to generate a mixed-frequency driving voltage pulse by synthesizing it from the given voltage pulses. The components of synthesized driving voltage pulse have continuously and individually varying amplitudes of multiple specific frequencies. With the proposed modulation method, only a standard full-bridge inverter is employed in the transmitting side to achieve power distribution among receivers, leading to a simple configuration of the transmitting source. Moreover, the proposed method has a small calculation burden and can be easily extended to the system with more receivers. When compared with the existing multifrequency modulation method, a lower switching frequency is obtained in the proposed method. Finally, the effectiveness of the proposed modulation method is verified theoretically and experimentally.

中文翻译：

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多频调制以实现具有逆变器的同步 MR-WPT 系统的单独和连续功率分配

为了实现多接收器无线电力传输 (WPT) 系统的独立和连续功率分配，已经提出了一种新颖的多频调制方法。在所提出的方法中，引入了查找表和 delta-sigma 调制方案，通过从给定的电压脉冲合成混合频率驱动电压脉冲来生成混合频率驱动电压脉冲。合成驱动电压脉冲的分量具有多个特定频率的连续且单独变化的幅度。使用所提出的调制方法，在发射侧仅采用标准全桥逆变器来实现接收器之间的功率分配，从而导致发射源的简单配置。而且，所提出的方法计算负担小，可以很容易地扩展到具有更多接收器的系统。与现有的多频调制方法相比，该方法获得了较低的开关频率。最后，从理论上和实验上验证了所提出的调制方法的有效性。