Browse > Article
http://dx.doi.org/10.5573/ieie.2014.51.9.041

High Gain and High Efficiency Class-E Power Amplifier Using Controlling Drain Bias for WPT  

Kim, Sanghwan (Information and Telecommunication Engineering, Soongsil University)
Seo, Chulhun (Information and Telecommunication Engineering, Soongsil University)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.51, no.9, 2014 , pp. 41-45 More about this Journal
Abstract
In this paper, a high-efficiency power amplifier is implemented by using a drain bias control circuit operated at low input power for WPT(Wireless Power Transfer). Adaptive bias control circuit was added to high-efficiency class-E amplifier. It was possible to obtain the overall improvement in efficiency by adjusting the drain bias at low input power. The proposed adaptive class-E amplifier is implemented by using the input and output matching network and serial resonant circuit for improvement in efficiency. Drain bias control circuit consists of a directional coupler, power detector, and operational amplifier for adjusting the drain bias according to the input power. The measured results show that output powers of 41.83 dBm were obtained at 13.56 MHz. At this frequency, we have obtained the power added efficiency(PAE) of 85.67 %. It was confirmed increase of PAE of an average of 8 % than the fixed bias from the low input power level of 0 dBm ~ 6 dBm.
Keywords
13.56 MHz;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Matthew M. Radmanesh, Radio Frequency and Microwave electronics Illustrated. Prentice Hall PTR, 2001.
2 A. Karalis, J. D. Joannopoulos, M. Soljacic, "Efficient wireless non-radiative mid-range energy transfer," Annals of Physics, vol. 323, no. 1, pp. 34-48, January 2008.   DOI   ScienceOn
3 B. L. Cannon, 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 Transactions on Power Electronics, vol. 24, no. 7, pp. 1819-1825, July 2009.   DOI   ScienceOn
4 Y. S. Jeon J. K Cha, S. W. Nam, "High-Efficiency power amplifier using novel dynamic bias switching", IEEE Transactions on Microwave Theory And Techniques, vol. 55, no. 4, April 2007.
5 S. C. Cripps, RF Power Amplifiers for Wireless Communications, Artech House, 1999.
6 A. Grebennikov, N. O. Sokal, Switchmode RF power Amplifiers, ewnes, 2007.
7 N. O. Sokal and A. D. Sokal, "Class-E a new class of high efficiency tuned single-ended switching power amplifiers", IEEE Journal of Solid-State Circuits, vol. 10, no. 3, pp. 168-176, Jun 1975.   DOI