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Waveform Impact on Wireless Power Transfer Efficiency using Low-Power Harvesting Devices

机译：使用低功率采集设备的波形对无线功率传输效率的影响

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The paper addresses the impact of peak-to-average power ratio (PAPR) and spectrum of the waveform, as well as load resistance on the performance of low-power harvesting device in a real-life wireless power transfer (WPT) scenario. In the current study, a combination of the classic voltage doubler circuit for RFDC conversion and premanufactured device for DC-DC conversion is used. For the investigation of conversion efficiency and harvesting device performance, three types of waveforms are used: single tone, multicarrier signals with low PAPR and multicarrier signal with high PAPR. In order to generate high-PAPR signal, subcarriers with the same amplitude and phase are summed, whereas for generation of low PAPR signal the phases of the subcarriers are chosen pseudo-randomly. Over-the-air transmission in 865 MHz ISM band is made using directional antennas and all multicarrier waveforms have equal 5 MHz bandwidth. To evaluate the performance of harvesting device and conversion efficiency, the average voltages at the input and output of the RF-DC converter as well as at the output of the DC-DC converter with corresponding input and load impedance are measured. The experiments have shown that the employed multicarrier signals can greatly improve the performance of harvesting device during WPT under certain conditions, which are discussed in the paper.
机译：本文探讨了峰均功率比（PAPR）和波形频谱的影响，以及负载电阻对现实生活中无线功率传输（WPT）情况下低功率采集设备性能的影响。在当前的研究中，结合了用于RFDC转换的经典倍压电路和用于DC-DC转换的预制设备的组合。为了研究转换效率和采集设备的性能，使用了三种类型的波形：单音，低PAPR的多载波信号和高PAPR的多载波信号。为了产生高PAPR信号，将具有相同幅度和相位的子载波相加，而为了产生低PAPR信号，子载波的相位被伪随机地选择。 865 MHz ISM频段的空中传输是使用定向天线完成的，所有多载波波形都具有相等的5 MHz带宽。为了评估采集设备的性能和转换效率，需要测量RF-DC转换器的输入和输出以及具有相应输入阻抗和负载阻抗的DC-DC转换器的输出处的平均电压。实验表明，在一定条件下，采用多载波信号可以大大提高WPT采集设备的性能，本文对此进行了讨论。

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