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A Novel Modulation and Demodulation Method Based on Binary Frequency Shift Keying for Wireless Power and

Peizhou Liu1, Tiande Gao1, Ruixuan Zhao2

  • 1School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China.

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|September 23, 2022
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Summary

This study introduces a new parallel method for wireless power and data transfer in WPT systems. It achieves reliable data communication up to 10 kbps, overcoming magnetic interference challenges.

Keywords:
datafrequency shift keyingwireless power transfer

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Area of Science:

  • Electrical Engineering
  • Wireless Power Transfer Technology
  • Communication Systems

Background:

  • Reliable communication in Wireless Power Transfer (WPT) systems is challenging due to magnetic interferences between primary and pick-up sides.
  • Existing methods struggle to maintain stable data transmission alongside power delivery.

Purpose of the Study:

  • To propose a novel parallel transmission method for simultaneously transferring wireless power and data.
  • To overcome the magnetic interference issues inherent in WPT systems for robust communication.

Main Methods:

  • Utilized Frequency Shift Keying (FSK) modulation and demodulation for data transmission.
  • Data signals were transmitted by altering the inverter's working frequency.
  • Employed Phase-Locked Loop (PLL) technology for data demodulation before the rectifier circuit.

Main Results:

  • A 426 W prototype successfully verified the proposed transmission method's effectiveness.
  • Stable data transmission at a 10 kbps baud rate was achieved.
  • The method demonstrated resilience across a wide output power range (tens to hundreds of watts).

Conclusions:

  • The novel parallel transmission method reliably separates power and data signals in WPT systems.
  • FSK modulation and PLL demodulation effectively mitigate magnetic interference for data communication.
  • This approach enables stable, high-speed data transfer in practical WPT applications.