volume | PIER Journals

Abstract

A class E power amplifier including coupling coils is proposed for application in a wireless power transfer system using magnetic coupling. The proposed amplifier is directly connected to the coils with no discrete components for harmonic filtering and dc feeding, which could cause efficiency degradation of the amplifier. The system with the differential amplifier shows 6.95 W of transmitted power and 44.6% transmission efficiency at 6.8 MHz with 14-cm distant coils. The power-added efficiency of the amplifier is 92.1% with a 14 V supply voltage, excluding the coupling efficiency of the wireless power transfer network.

1. Peng, L., O. Breinbjerg, and N. A. Mortensen, "Wireless energy transfer through non-resonant magnetic coupling," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 11-12, 1587-1598, 2010.
doi:10.1163/156939310792149795 Google Scholar

2. Choi, J. and C. Seo, "High-efficiency wireless energy transmission using magnetic resonance based on negative refractive index metamaterial," Progress In Electromagnetics Research, Vol. 106, 33-47, 2010.
doi:10.2528/PIER10050609 Google Scholar

3. Wei, X. C. and E. P. Li, "Simulation and experimental comparison of different coupling mechanisms for the wireless electricity transfer," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 7, 925-934, 2009.
doi:10.1163/156939309788355180 Google Scholar

4. Cannon, B. L., J. F. Hoburg, D. D. Stancil, and S. C. Goldstein, "Magnetic resonant coupling as a potential means for wireless power transfer to multiple small receivers," IEEE Trans. Power Elect., Vol. 24, No. 7, 1819-1825, Jul. 2009.
doi:10.1109/TPEL.2009.2017195 Google Scholar

5. Jang, , B.-J., S. Lee, and H. Yoon, "HF-band wireless power transfer system: Concept, issues, and design," Progress In Electromagnetics Research, Vol. 124, 211-231, 2012.
doi:10.2528/PIER11120511 Google Scholar

6. Laskovski, A. N. and M. R. Yuce, "Class-E oscillators as wireless power transmitters for biomedical implants," Proc. 3rd Int. Symp. Appl. Sci. Biomedical and Communication Tech., 1-5, Rome, Nov. 2010 . Google Scholar

7. Ma, Q., M. R. Haider, S. Yuan, and S. K. Islam, "Power-oscillator based high e±ciency inductive power-link for transcutaneous power transmission," Proc. 55rd IEEE Int. Midwest Symp. Circuits and Systems, 537-540, Seattle, 2010. Google Scholar

8. Juntunen, E., D. Dawn, S. Pinel, and J. Laskar, "A high-efficiency, high-power millimeter-wave oscillator using a feedback class-e power amplifier in 45nm CMOS," IEEE Microw. Wireless Compon. Lett., Vol. 21, No. 8, 430-432, Aug. 2011.
doi:10.1109/LMWC.2011.2157334 Google Scholar

9. Jimenez-Martin, J. L., V. Gonzalez-Posadas, J. E. Gonzalez-Garcia, F. J. Arques-Orobon, L. E. Garcia-Munoz, and D. Segovia-Vargas, "Dual band high efficiency class ce power amplifier based on CRLH diplexer," Progress In Electromagnetics Research, Vol. 97, 217-240, 2009.
doi:10.2528/PIER09071609 Google Scholar

10. Grebennikov, , A. V., "Switched-mode rf and microwave parallelcircuit class E power amplifiers," Int. J. RF and Microw. Computer-Aided Eng., Vol. 14, No. 1, 21-35, Jan. 2004.
doi:10.1002/mmce.10112 Google Scholar

11. Son, H.-C., J. W. Kim, D.-H. Kim, K.-H. Kim, and Y.-J. Park, "Self-resonant coil with coaxial-like capacitor for wireless power transfer," Proc. Asia-Pacific Microw. Conf., 90-93, Melbourne, 2011. Google Scholar

Dr. Jong-Ryul Yang

Dr. Hyeon-Chang Son

Dr. Young-Jin Park