Series–Parallel-Form Switch-Linear Hybrid Envelope-Tracking Power Supply to Achieve High Efficiency

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

18 Scopus Citations
View graph of relations

Author(s)

  • Qian Jin
  • Xinbo Ruan
  • Xiaoyong Ren
  • Yazhou Wang
  • Yang Leng

Detail(s)

Original languageEnglish
Article number7524695
Pages (from-to)244-252
Journal / PublicationIEEE Transactions on Industrial Electronics
Volume64
Issue number1
Online published28 Jul 2016
Publication statusPublished - Jan 2017
Externally publishedYes

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.

Research Area(s)

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

Citation Format(s)