Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Realization of Alignment-Free WPT System

  • Park, Byung-Chul (Department of Electronic Information and Communication Engineering, Hongik University) ;
  • Son, Yong-Ho (Department of Electrical Engineering, Kookmin University) ;
  • Jang, Byung-Jun (Department of Electrical Engineering, Kookmin University) ;
  • Lee, Jeong-Hae (Department of Electronic Information and Communication Engineering, Hongik University)
  • Received : 2014.11.07
  • Accepted : 2014.12.12
  • Published : 2014.12.30
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Abstract

A simple realization of an alignment-free wireless power transmission (WPT) system is presented in this letter. The WPT system consists of a transmitter with three reconfigurable modes corresponding to various controllable magnetic field directions in the azimuthal plane and an algorithm for the optimum mode selection carried by sensing the reflected voltage of the system. Twelve light emitting diodes (LEDs) are used to confirm the on- and off-state of LEDs powered wirelessly by the transmitter at every $15^{\circ}$ of the azimuthal plane. A criterion voltage from the reflected power of the system is found by using the correlation between the reflected voltage and the on- and off-state of the LEDs. Simply by continuous; monitoring of the voltage from the system, the system maintains power to the LEDs. The system is realized by MATLAB/Simulink and a National Instrument data acquisition device (DAQ) board. Measurements using the system show on-state LEDs in the azimuthal plane except at the angles of $60^{\circ}$, $75^{\circ}$, $180^{\circ}$, and $300^{\circ}$.

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References

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