采用阶梯波方式的高效开关线性复合包络线跟踪电源

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摘要针对开关频率对系统效率的影响和对提高跟踪频率的限制,提出一种采用阶梯波方式的高效SLH ET电源,其优势在于每个开关管在一个跟踪周期内只需动作一次,与相同跟踪带宽下的其他现有方法相比,减小开关频率的同时还可以大幅降低输出电压谐波,从而提升开关变换器的效率。本文从基波拟合准确度和电压谐波角度详细分析了阶梯电平数及阶差的选择。同时采用输出电压全前馈实现开关变换器输出电流跟踪负载电流,避免线性放大器提供基波电流降低系统效率。最后搭建了一台跟踪频率为300kHz、输出电压为10~26V的正弦波,峰值输出功率为50W的ET电源原理样机,实验结果验证了理论分析的正确性,效率达到81.3%。同时,与两电平方式进行对比,实验结果表明阶梯波方式不仅能提高系统效率,还可获得更高跟踪带宽。

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	金茜
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关键词 ：功率放大器, 包络线跟踪, 阶梯波方式, 前馈控制

Abstract：Featuring both high bandwidth and high efficiency, paralleled switch-linear hybrid envelope-tracking (SLH ET) power supply wins a lot attentions. This paper proposes a new topology where step-wave converter in parallel with linear amplifier is adopted. It benefits the overall efficiency and tracking bandwidth with lower switching frequency. The structure operates each switcher only once during every tracking period. Compared with other schemes with the same tracking bandwidth, it reduces the switching frequency and harmonic voltage of the output voltage, thus obtains higher efficiency. The consideration of the step number and the step difference are discussed for higher synthesis accuracy and lower voltage harmonics. The full feed-forward output voltage scheme is adopted to enable the output current to track the load current. It avoids that the linear amplifier may provide the fundamental current which reduces the system efficiency. Finally, a prototype ET power source is built aiming for 300kHz sine wave tracking, with 10~26V sine output voltage and 50W peak output power. The experimental results are presented to verify the effectiveness of the proposed method with efficiency being 81.3%. Besides, the step-wave method is proved to obtain higher efficiency and tracking bandwidth, compared with the two-level method.

Key words： Power amplifier envelope tracking step-wave method feed-forward

收稿日期: 2013-08-16 出版日期: 2015-10-20

PACS:

TM46

作者简介: 金茜女,1988年生,博士研究生,研究方向为模块电源及高速电压随动电源。阮新波男,1970年生,博士,教授,博士生导师,研究方向为高频软开关直直变换器、高频软开关逆变器、变换器建模、电力电子系统集成和新能源供电系统。

引用本文:

金茜, 阮新波, 郗焕, 熊小玲. 采用阶梯波方式的高效开关线性复合包络线跟踪电源[J]. 电工技术学报, 2015, 30(18): 43-51. Jin Qian, Ruan Xinbo, Xi Huan, Xiong Xiaoling. High Efficiency Switch-Linear Hybrid Envelope-Tracking Power Supply by Step-Wave Method. Transactions of China Electrotechnical Society, 2015, 30(18): 43-51.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2015/V30/I18/43

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