包络线跟踪电源技术综述

发布时间：2019-06-03 23:11

【摘要】：随着第四代移动通信的高速发展,射频输入信号的包络带宽越来越宽,功率峰均比越来越大,导致采用恒压供电的基站功放效率越来越低。包络线跟踪(ET)技术是大幅提高功放效率的有效方法之一,对于节能减排和缓解环境污染具有重要意义。ET电源是ET技术的核心装置,一般采用开关线性复合(SLH)结构,该结构结合了开关变换器高效率和线性放大器高带宽的优点。本文首先介绍高带宽线性放大器和高效率开关变换器的实现方法,然后介绍SLH ET电源的两个基本架构,即串联和并联架构。在分析这两个基本架构的基础上,提出SLH ET电源的串并联架构的概念,以进一步减小线性放大器输出的功率,提高SLH ET电源的效率。最后,针对现代移动通信对ET电源的要求,从阶梯波提供单元的优化、Ga N器件在ET电源中的应用、包络信号功率频谱的分段方法以及开关变换器控制策略的改进等四个方面提出进一步提升ET电源效率的方法。
[Abstract]:With the rapid development of the fourth generation mobile communication, the envelope bandwidth of RF input signal is wider and wider, and the power peak-to-average ratio (PAPR) is larger and larger, which leads to the lower and lower efficiency of base station power amplifier with constant voltage power supply. Envelope tracking (ET) technology is one of the effective methods to greatly improve the efficiency of power amplifier, which is of great significance for energy saving and emission reduction and mitigation of environmental pollution. Et power supply is the core device of ET technology, which generally adopts switching linear composite (SLH) structure. This structure combines the advantages of high efficiency of switching converter and high bandwidth of linear amplifier. This paper first introduces the implementation of high bandwidth linear amplifier and high efficiency switching converter, and then introduces two basic structures of SLH ET power supply, namely, series and parallel architecture. Based on the analysis of these two basic structures, the concept of series-parallel architecture of SLH ET power supply is put forward in order to further reduce the output power of linear amplifier and improve the efficiency of SLH ET power supply. Finally, according to the requirement of ET power supply in modern mobile communication, the application of, Ga N device in ET power supply is optimized from the step wave providing unit. The piecewise method of envelope signal power spectrum and the improvement of control strategy of switching converter are proposed to further improve the efficiency of ET power supply.
【作者单位】：南京航空航天大学多电飞机电气系统工信部重点实验室;
【基金】：国家自然科学基金资助项目(51577090)
【分类号】：TM46

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