전기전자학회논문지 (Journal of IKEEE)

  • 제23권1호
  • /
  • Pages.306-309
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  • 2019
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  • 1226-7244(pISSN)
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  • 2288-243X(eISSN)
한국전기전자학회 (Institute of Korean Electrical and Electronics Engineers)
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Implementation of Wireless Power Transfer Circuit by Using Magnetic Resonant Coupling Method

  • Lho, Young-Hwan (Dept. of Railroad Electrical System Engineering, Woosong University)
  • 투고 : 2019.03.04
  • 심사 : 2019.03.22
  • 발행 : 2019.03.31
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초록

Wireless charging is a technology of transmitting power through an air gap to an electrical load for the purpose of energy dissemination. Compared to traditional charging with code, wireless power charging has many benefits of avoiding the hassle from connecting cables, rendering the design and fabrication of much smaller devices without the attachment of batteries, providing flexibility for devices, and enhancing energy efficiency, etc. A transmitting coil and a receiving coil for inductive coupling or magnetic resonant coupling methods are available for the near field techniques, but are not for the far field one. In this paper, the wireless power transfer (WPT) circuit by using magnetic resonant coupling method with a resonant frequency of 13.45 Mhz for the low power system is implemented to measure the power transmission efficiency in terms of mutual distance and omnidirectional angles of receiver.

키워드

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Fig. 1. A scheme for magnetic resonant coupling circuit.

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Fig. 2. The circuit for magnetic resonant coupling board.

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Fig. 3. The voltage and current at each node for magnetic resonant coupling circuit.

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Fig. 4. Transmission parameter S21 vs. freqeuncy and coupling coefficent of k.

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Fig. 5. The implementation of transmitting, resonant and receiving part with resonant frequency of 13.45 Mhz.

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Fig. 6. Input waveform.

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Fig. 8. Output waveform for mutual distance of 16 mm.

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Fig. 10. Transmission efficiency vs. mutual distance for C=50 pF, L=2.8 μH.

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Fig. 7. Output waveform of Schottky diode.

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Fig. 9. Output waveform for mutual distance of 50 mm.

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Fig. 11. Transmission efficiency vs. mutual distance of 50 mm with angles of receiver.

참고문헌

  1. Homepage of Wireless Power Consortium, http://www.wirelesspowerconsortium.com.
  2. W. C. Brown, "The history of power transmission by radio waves," IEEE Transaction on Microwave Theory and Techniques, vol. 32, no, 9, pp. 1230-242, 1984. DOI: 10.1109/TMTT.1984.1132833
  3. N. Tesla, "Apparatus for transmitting electrical energy," U.S. patent, 1914
  4. A. Kurs, A. Karalis, et. al. "Wireless power transfer via strongly coupled magnetic resonances," Science, vol. 317, no. 5834, pp. 83-86, 2007. DOI: 10.1126/science.1143254
  5. Junfeng Chen et al, "Metamaterial- Based High-Efficiency Wireless Power Transfer System at 13.56 MHz for Low Power Applications," Progress In Electromagnetics Research B, Vol. 72, 17-30, 2017. DOI: 10.2528/PIERB16071509
  6. Donggeon Kim and Chulhun Seo, "Omnidirectional Resonator in X-Y Plane Using a Crisscross Structure for Wireless Power Transfer," Journal of Electromagnetic Engineering and Science, vol. 15, no. 3, pp. 194-198, 2015. DOI: 10.5515/JKIEES.2015.15.3.194