Series-parallel-form switch-linear hybrid envelope-tracking power supply to achieve high efficiency

Qian Jin, Xinbo Ruan, Xiaoyong Ren, Yazhou Wang, Yang Leng, Chi Kong Tse

Research output: Journal article publicationJournal articleAcademic researchpeer-review

22 Citations (Scopus)

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.
Original languageEnglish
Article number7524695
Pages (from-to)244-252
Number of pages9
JournalIEEE Transactions on Industrial Electronics
Volume64
Issue number1
DOIs
Publication statusPublished - 1 Jan 2017

Keywords

  • Current prediction control
  • envelope tracking (ET)
  • power amplifier (PA)
  • series-parallel form

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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