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Title: Series-parallel-form switch-linear hybrid envelope-tracking power supply to achieve high efficiency
Authors: Jin, Q
Ruan, X
Ren, X
Wang, Y
Leng, Y
Tse, CK 
Keywords: Current prediction control
Envelope tracking (ET)
Power amplifier (PA)
Series-parallel form
Issue Date: 2017
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on industrial electronics, 2017, v. 64, no. 1, 7524695, p. 244-252 How to cite?
Journal: IEEE transactions on industrial electronics 
Abstract: Envelope tracking (ET) techniques have been used to improve the efficiency of power amplifiers in wireless communication systems. The switch-linear hybrid (SLH) ET power supply, which features both wide tracking bandwidth and high efficiency, has received a great deal of attention. In both series- and parallel-form SLH ET power supply, the power loss of the linear amplifier is relatively high. This paper proposes a series-parallel form for the SLH ET power supply, which includes two switched-mode converters and one linear amplifier, to reduce both the output voltage swing and output current of the linear amplifier, thus reducing the power loss of the linear amplifier. A current prediction control scheme is proposed to remove the current sensor in the switched-mode converter, achieving accurate control for high-frequency current. A prototype is built for 5 MHz wideband code division multiple access envelope signal tracking and 40 W peak output power. The tested efficiency of the proposed configuration is 80.4%, which is much higher than that of the series-form SLH ET power supply.
ISSN: 0278-0046
EISSN: 1557-9948
DOI: 10.1109/TIE.2016.2595479
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