<abstract xmlns="http://www.w3.org/1999/xhtml"><p>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.</p></abstract>

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.

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

Electrical, Control and Communication Engineering

This work is licensed under the Creative Commons Attribution 4.0 Public License.

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...

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

Published Online: Mar 20, 2020

Page range: 96 - 103

DOI: https://doi.org/10.2478/ecce-2019-0013

Keywords
Energy harvesting, DC-DC power converters, Internet of Things, low-power electronics, peak-to-average power ratio, radio frequency, wireless power transmission, wireless sensor networks

© 2019 Janis Eidaks et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 Public License.

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

Published Online: Mar 20, 2020

Page range: 96 - 103

DOI: https://doi.org/10.2478/ecce-2019-0013

KeywordsEnergy harvesting, DC-DC power converters, Internet of Things, low-power electronics, peak-to-average power ratio, radio frequency, wireless power transmission, wireless sensor networks

© 2019 Janis Eidaks et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 Public License.

Keywords
Energy harvesting, DC-DC power converters, Internet of Things, low-power electronics, peak-to-average power ratio, radio frequency, wireless power transmission, wireless sensor networks