全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

一种开关线性复合包络线跟踪电源的控制策略

, PP. 101-107

Keywords: 3G通信,ET技术,组合电源,AB类线性电源,同步整流Buck变换器,控制策略

Full-Text   Cite this paper   Add to My Lib

Abstract:

在3G移动通信系统中,射频功放的输入信号包络线幅值是变化的,且带宽较高,采用恒定电压给射频功放供电,其损耗将很大。包络线跟踪电源可以使供电电压跟随输入信号包络线的变化而变化,使得功放的功率管压降较小,从而提高系统效率。采用开关电源和线性电源并联构成的包络线跟踪电源,其中高带宽的线性电源用于调节输出电压,低带宽的开关电源提供大部分负载功率,以提高电源效率。针对此结构,本文提出一种PWM电流控制策略,使得开关电源工作频率恒定,并对此控制方法进行改进,引入输出电压前馈支路,进一步减小线性电源电流,提高系统效率。文中最后以跟踪频率小于100kHz的正弦信号给出设计实例,并进行实验验证。

References

[1]  Saleh A A M, Cox D C. Improving the power-added efficiency of FET amplifiers operating with varying- envelope signals [J]. IEEE Transactions on Microwave Theory and Techniques, 1983, 31(1): 51-56.
[2]  Hanington G, Chen P, Asbeck P M, et al. High-efficiency power amplifier using dynamic power-supply voltage for CDMA applications [J]. IEEE Transactions on Microwave Theory and Techniques, 1999, 47(8): 1471-1476.
[3]  Shvarts E Y, Triolo A A, Ziesse N G. Variable output power supply [P]. US Patent, Pub. No. US2003/ 0146791A1, Aug. 7, 2003.
[4]  刘晓东, 刘宿城, 姜克抗. 基于开关线性复合机理的高效率准线性功率放大器[J]. 电工技术学报, 2008, 23(9): 98-104.
[5]  Mathe L, Kimball D, Arehambault J, Haley W. Apparatus and method for efficiently amplifying wideband envelope signals [P]. US Patent No. 6300826B1, Oct. 9, 2001.
[6]  Yousefzadeh V, Alarcón E, Maksimović D. Efficiency optimization in linear-assisted switching power converters for envelope tracking in RF power amplifiers[C]. Proceedings of IEEE International Symposium on Circuits and Systems, 2005: 1302- 1305.
[7]  Vasic M, Garcia O, Oliver J A, Alou P, Diaz D, Cobos J A. Multilevel power supply for high efficiency RF amplifier[C]. Proceedings of IEEE Applied Power Electronics Conference, 2009: 1233-1238.
[8]  Yundt G B. Series parallel connected composite amplifiers [T]. Master Thesis. Massachusetts Institute of Technology, 1983.
[9]  Ertl H, Kolar J W, Zach F C. Basic considerations and topologies of switched-mode assisted linear power amplifiers[J]. IEEE Transactions on Industrial Electronics, 1997, 44(1): 116-123.
[10]  Self D. Audio power amplifier design handbook [M]. London (U.K): Butterworth-Heinemann, 2006.
[11]  Nujira energy primer [W]. Available: http:// www. nujira. com.
[12]  Høyerby M C W, Andersen M A E. High-bandwidth, high-efficiency envelope tracking power supply for 40W RF power amplifier using paralleled bandpass current sources [C]. Proceedings of IEEE Power Electronics Specialist Conference, 2005: 2804-2809.
[13]  Markowski P. Power supply providing ultra fast modulation of output voltage [P]. US Patent, Pub. No. US2007/0024360A1, Feb. 1, 2007.
[14]  Yousefzadeh V, Alarcón E, Maksimović D. Three- level buck converter for envelope tracking applications [J]. IEEE Transactions on Power Electronics, 2006, 21(2): 549-552.
[15]  Wilson M P. High efficiency amplification [P]. US Patent, Pub. No. US2006/0028271A1, Feb. 9, 2006.
[16]  Liu X D, Liu S C, Jiang K K. A high efficiency quasi-linear power amplifier based on switch-linear hybrid scheme [J]. Transactions of China Electrote- chnical Society, 2008, 23(9): 98-104.
[17]  Høyerby M C W, Andersen M A E. Envelope tracking power supply with fully controlled 4th order output filter[C]. Proceedings of IEEE Applied Power Electronics Conference, 2006: 993-1000.
[18]  Van der Zee R A R, Van Tuijl A J M. A power- efficient audio amplifier combining switching and linear techniques [J]. IEEE Journal of Solid-state Circuits, 1999, 34(7): 985-991.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133