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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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

Received: 16 August 2013 Published: 20 October 2015

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TM46

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	Jin Qian
	Ruan Xinbo
	Xi Huan
	Xiong Xiaoling

Cite this article:

Jin Qian,Ruan Xinbo,Xi Huan等. High Efficiency Switch-Linear Hybrid Envelope-Tracking Power Supply by Step-Wave Method[J]. Transactions of China Electrotechnical Society, 2015, 30(18): 43-51.

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

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