In wireless charging devices, different wireless charging standards have caused charging incompatibility, and the utilization rate of the DC voltage at the transmitter is not high, which brings challenges to the application of wireless charging. To solve these two problems, this paper proposes a multi-frequency multi-amplitude (MFMA) superimposition modulation method. This method superimposes multiple frequency signals, and then compares the synthesized signal with a high-frequency triangular carrier to output a square wave voltage signal containing information such as the frequency and amplitude of the pre-output signal. Furthermore, a phase-shifting optimization algorithm is proposed, i.e., based on the proposed MFMA superimposition modulation method, the utilization rate of the DC voltage of the system is improved by reasonably adjusting the initial phase of each frequency. Simulation and experimental results show that the proposed method can output at least four frequencies simultaneously by using a single inverter, effectively reducing the volume of the transmitter, and being compatible with the frequency range of several charging standards. The proposed phase-shifting optimization has a significant effect on improving the utilization of DC voltage with an increase of 44.88%.

中文翻译：

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无线功率传输系统单逆变器的具有相移优化的多频多振幅叠加调制方法

在无线充电设备中，不同的无线充电标准导致充电不兼容，并且发射机处的直流电压的利用率不高，这给无线充电的应用带来了挑战。为了解决这两个问题，本文提出了一种多频多振幅（MFMA）叠加调制方法。此方法叠加多个频率信号，然后将合成信号与高频三角载波进行比较，以输出包含诸如预输出信号的频率和幅度等信息的方波电压信号。此外，提出了一种相移优化算法，即基于所提出的MFMA叠加调制方法，通过合理调整每个频率的初始相位，可以提高系统直流电压的利用率。仿真和实验结果表明，所提出的方法通过使用单个逆变器可以同时输出至少四个频率，有效地减小了发射器的体积，并且与几种充电标准的频率范围兼容。提出的相移优化对提高直流电压的利用率具有显着的效果，增加了44.88％。