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A Circuit Model-Based Analysis of Magnetically Coupled Resonant Loops in Wireless Power Transfer Systems

Year 2018, Volume: 18 Issue: 2, 159 - 166, 03.08.2018

Abstract

DOI: 10.26650/electrica.2018.55345

Magnetically coupled resonant loops can be represented by a lumped element circuit model. Each parameter in the lumped element model can be expressed as a function of loop geometry and the separation between the loops; therefore, the geometry can be systematically changed, and the power transfer efficiency of the coupled loops can be predicted. This paper presents a simulation-based efficiency analysis for wireless power transfer systems utilizing magnetically coupled resonant loops. The behavior of power transfer efficiency is studied for various loop geometry parameters, and the simulation results are presented in detail. These results clearly show that there is a trade-off between peak efficiency and critical coupling distance, both of which depend on the loop size, frequency of operation, and source-load impedances. To verify the accuracy model, two identical circular loops are fabricated and measured, and the measurement results agree well with the model. 

References

  • 1. A. Kurs, A. Karalis, R. Moffatt, J. D. Joannopoulos, P. Fisher, M. Soljacic, “Wireless power transfer via strongly coupled magnetic resonances”, Science, vol. 317, no. 5834 pp. 83-86, 2007. 2. F. Zhang, S. A. Hackworth, W. Fu, C. Li, Z. Mao, M. Sun, “Relay effect of wireless power transfer using strongly coupled magnetic resonances”, IEEE Transactions on Magnetics, vol. 47, no. 5, pp. 1478-1481, 2011. 3. A. Karalis, J. D. Joannopoulos, M. Soljačić, “Efficient wireless non-radiative mid-range energy transfer”, Annals of Physics, vol. 323, no. 1, pp. 34-48, 2008. 4. E. M. Thomas, J. D. Heebl, C. Pfeiffer, A. Grbic, “A power link study of wireless non-radiative power transfer systems using resonant shielded loops”, IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 59, no. 9 pp. 2125-2136, 2012. 5. J. D. Heebl, E. M. Thomas, R. P. Penno, A. Grbic, “Comprehensive analysis and measurement of frequency-tuned and impedance-tuned wireless non-radiative power-transfer systems”, IEEE Antennas and Propagation Magazine, vol. 56, no. 5, pp. 131-148, 2014. 6. C. G. Pope, “Coupled Mode Theory and Wireless Energy Transfer”, 2012. 7. J. Huh, W. Lee, S. Choi, G. H. Cho, C. T. Rim, “Explicit static circuit model of coupled magnetic resonance system”, 8th International Conference on Power Electronics - ECCE Asia, 2011. 8. A. Robichaud, M. Boudreault, D. Deslandes, “Theoretical Analysis of Resonant Wireless Power Transmission Links Composed of Electrically Small Loops”, PIER, vol. 143, pp. 485-501, 2013. 9. C. J. Chen, T. H. Chu, C. L. Lin, Z. C. Jou, “A study of loosely coupled loops for wireless power transfer”, IEEE Transactions on Circuits and Systems II: Express Briefs, vol. 57, no. 7, pp. 536-540, 2010. 10. S. H. Lee, R. D. Lorenz. “Development and validation of model for 95%-efficiency 220-W wireless power transfer over a 30-cm air gap”, IEEE Transactions on Industry Applications, vol. 47, no.6, pp. 2495-2504, 2011. 11. S. H. Lee, R. D. Lorenz. “A design methodology for multi-kW, large air-gap, MHz frequency, wireless power transfer systems”, Energy Conversion Congress and Exposition (ECCE), 2011. 12. T. Imura, H. Okabe, T. Uchida, Y. Hori, “Study on open and short end helical antennas with capacitor in series of wireless power transfer using magnetic resonant couplings”, 35th Annual Conference of IEEE Industrial Electronics, 2009. 13. J. Kim, J. Jeong, “Range-adaptive wireless power transfer using multiloop and tunable matching techniques”, IEEE Transactions on Industrial Electronics, vol. 62, no. 10, pp. 6233-6241, 2015. 14. X. Wei, Z. Wang, H. Dai, “A critical review of wireless power transfer via strongly coupled magnetic resonances”, Energies, vol. 7, no. 7 pp. 4316-4341, 2014. 15. B. J. Jang, S. Lee, H. Yoon, “HF-band wireless power transfer system: Concept, issues, and design”, Progress in Electromagnetics Research, vol. 124, pp. 211-231, 2012. 16. C. A. Balanis, Antenna theory: analysis and design, John Wiley & Sons, 2016. 17. D. M. Pozar, Microwave engineering, John Wiley & Sons, 2009. 18. Y. Gao, C. Zhou, J. Zhou, X. Huang and D. Yu, “Automatic Frequency Tuning with Power-Level Tracking System for Wireless Charging of Electric Vehicles”, IEEE Vehicle Power and Propulsion Conference (VPPC), 2016. 19. D.P. Kar, P.P. Nayak, S. Bhuyan, S.K. Panda, “Automatic frequency tuning wireless charging system for enhancement of efficiency,” in Electronics Letters, vol. 50, pp. 1868-1870, November 2014. 20. S. A. Sis, S. Bicakci, “A resonance frequency tracker and source frequency tuner for inductively coupled wireless power transfer systems”, 46th European Microwave Conference (EuMC), 2016, pp. 751-754. 21. S. Bıçakçı, S. A. Sis, “Design Of A Resonance Frequency Tracking System For Rf Applications”, GU J Sci, vol. 5, no. 2, pp. 211-221, 2017.

A Circuit Model-Based Analysis of Magnetically Coupled Resonant Loops in Wireless Power Transfer Systems

Year 2018, Volume: 18 Issue: 2, 159 - 166, 03.08.2018

Abstract

DOI: 10.26650/electrica.2018.55345

Magnetically coupled resonant loops can be
represented by a lumped element circuit model. Each parameter in the lumped
element model can be expressed as a function of loop geometry and the
separation between the loops; therefore, the geometry can be systematically
changed, and the power transfer efficiency of the coupled loops can be
predicted. This paper presents a simulation-based efficiency analysis for
wireless power transfer systems utilizing magnetically coupled resonant loops.
The behavior of power transfer efficiency is studied for various loop geometry
parameters, and the simulation results are presented in detail. These results
clearly show that there is a trade-off between peak efficiency and critical
coupling distance, both of which depend on the loop size, frequency of
operation, and source-load impedances. To verify the accuracy model, two
identical circular loops are fabricated and measured, and the measurement
results agree well with the model. 

References

  • 1. A. Kurs, A. Karalis, R. Moffatt, J. D. Joannopoulos, P. Fisher, M. Soljacic, “Wireless power transfer via strongly coupled magnetic resonances”, Science, vol. 317, no. 5834 pp. 83-86, 2007. 2. F. Zhang, S. A. Hackworth, W. Fu, C. Li, Z. Mao, M. Sun, “Relay effect of wireless power transfer using strongly coupled magnetic resonances”, IEEE Transactions on Magnetics, vol. 47, no. 5, pp. 1478-1481, 2011. 3. A. Karalis, J. D. Joannopoulos, M. Soljačić, “Efficient wireless non-radiative mid-range energy transfer”, Annals of Physics, vol. 323, no. 1, pp. 34-48, 2008. 4. E. M. Thomas, J. D. Heebl, C. Pfeiffer, A. Grbic, “A power link study of wireless non-radiative power transfer systems using resonant shielded loops”, IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 59, no. 9 pp. 2125-2136, 2012. 5. J. D. Heebl, E. M. Thomas, R. P. Penno, A. Grbic, “Comprehensive analysis and measurement of frequency-tuned and impedance-tuned wireless non-radiative power-transfer systems”, IEEE Antennas and Propagation Magazine, vol. 56, no. 5, pp. 131-148, 2014. 6. C. G. Pope, “Coupled Mode Theory and Wireless Energy Transfer”, 2012. 7. J. Huh, W. Lee, S. Choi, G. H. Cho, C. T. Rim, “Explicit static circuit model of coupled magnetic resonance system”, 8th International Conference on Power Electronics - ECCE Asia, 2011. 8. A. Robichaud, M. Boudreault, D. Deslandes, “Theoretical Analysis of Resonant Wireless Power Transmission Links Composed of Electrically Small Loops”, PIER, vol. 143, pp. 485-501, 2013. 9. C. J. Chen, T. H. Chu, C. L. Lin, Z. C. Jou, “A study of loosely coupled loops for wireless power transfer”, IEEE Transactions on Circuits and Systems II: Express Briefs, vol. 57, no. 7, pp. 536-540, 2010. 10. S. H. Lee, R. D. Lorenz. “Development and validation of model for 95%-efficiency 220-W wireless power transfer over a 30-cm air gap”, IEEE Transactions on Industry Applications, vol. 47, no.6, pp. 2495-2504, 2011. 11. S. H. Lee, R. D. Lorenz. “A design methodology for multi-kW, large air-gap, MHz frequency, wireless power transfer systems”, Energy Conversion Congress and Exposition (ECCE), 2011. 12. T. Imura, H. Okabe, T. Uchida, Y. Hori, “Study on open and short end helical antennas with capacitor in series of wireless power transfer using magnetic resonant couplings”, 35th Annual Conference of IEEE Industrial Electronics, 2009. 13. J. Kim, J. Jeong, “Range-adaptive wireless power transfer using multiloop and tunable matching techniques”, IEEE Transactions on Industrial Electronics, vol. 62, no. 10, pp. 6233-6241, 2015. 14. X. Wei, Z. Wang, H. Dai, “A critical review of wireless power transfer via strongly coupled magnetic resonances”, Energies, vol. 7, no. 7 pp. 4316-4341, 2014. 15. B. J. Jang, S. Lee, H. Yoon, “HF-band wireless power transfer system: Concept, issues, and design”, Progress in Electromagnetics Research, vol. 124, pp. 211-231, 2012. 16. C. A. Balanis, Antenna theory: analysis and design, John Wiley & Sons, 2016. 17. D. M. Pozar, Microwave engineering, John Wiley & Sons, 2009. 18. Y. Gao, C. Zhou, J. Zhou, X. Huang and D. Yu, “Automatic Frequency Tuning with Power-Level Tracking System for Wireless Charging of Electric Vehicles”, IEEE Vehicle Power and Propulsion Conference (VPPC), 2016. 19. D.P. Kar, P.P. Nayak, S. Bhuyan, S.K. Panda, “Automatic frequency tuning wireless charging system for enhancement of efficiency,” in Electronics Letters, vol. 50, pp. 1868-1870, November 2014. 20. S. A. Sis, S. Bicakci, “A resonance frequency tracker and source frequency tuner for inductively coupled wireless power transfer systems”, 46th European Microwave Conference (EuMC), 2016, pp. 751-754. 21. S. Bıçakçı, S. A. Sis, “Design Of A Resonance Frequency Tracking System For Rf Applications”, GU J Sci, vol. 5, no. 2, pp. 211-221, 2017.
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Details

Primary Language English
Subjects Engineering
Journal Section Articles
Authors

Seyit Ahmet Sis

Publication Date August 3, 2018
Published in Issue Year 2018 Volume: 18 Issue: 2

Cite

APA Sis, S. A. (2018). A Circuit Model-Based Analysis of Magnetically Coupled Resonant Loops in Wireless Power Transfer Systems. Electrica, 18(2), 159-166.
AMA Sis SA. A Circuit Model-Based Analysis of Magnetically Coupled Resonant Loops in Wireless Power Transfer Systems. Electrica. August 2018;18(2):159-166.
Chicago Sis, Seyit Ahmet. “A Circuit Model-Based Analysis of Magnetically Coupled Resonant Loops in Wireless Power Transfer Systems”. Electrica 18, no. 2 (August 2018): 159-66.
EndNote Sis SA (August 1, 2018) A Circuit Model-Based Analysis of Magnetically Coupled Resonant Loops in Wireless Power Transfer Systems. Electrica 18 2 159–166.
IEEE S. A. Sis, “A Circuit Model-Based Analysis of Magnetically Coupled Resonant Loops in Wireless Power Transfer Systems”, Electrica, vol. 18, no. 2, pp. 159–166, 2018.
ISNAD Sis, Seyit Ahmet. “A Circuit Model-Based Analysis of Magnetically Coupled Resonant Loops in Wireless Power Transfer Systems”. Electrica 18/2 (August 2018), 159-166.
JAMA Sis SA. A Circuit Model-Based Analysis of Magnetically Coupled Resonant Loops in Wireless Power Transfer Systems. Electrica. 2018;18:159–166.
MLA Sis, Seyit Ahmet. “A Circuit Model-Based Analysis of Magnetically Coupled Resonant Loops in Wireless Power Transfer Systems”. Electrica, vol. 18, no. 2, 2018, pp. 159-66.
Vancouver Sis SA. A Circuit Model-Based Analysis of Magnetically Coupled Resonant Loops in Wireless Power Transfer Systems. Electrica. 2018;18(2):159-66.