An 83.4% peak efficiency single-inductor multiple-output based adaptive gate biasing DC-DC converter for thermoelectric energy harvesting

Po-Hung Chen, Philex Ming Yan Fan

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

This paper presents a 100 mV input, 500 mV output single-inductor multiple-output (SIMO) based step-up dc-dc converter with adaptive gate biasing (AGB) technique implemented in 0.18 μm CMOS technology for thermoelectric energy harvesting. The proposed AGB technique and near-threshold voltage (near-VTH) energy redistribution control (ERC) ensure high conversion efficiency over a wide range of load currents. The proposed method automatically reduces conduction and switching losses of power MOSFETs without the need for auxiliary power converters or additional off-chip inductors. The AGB technique reduces conduction and switching losses under heavy-load and light-load conditions, respectively. The experimental results show that the efficiency of the proposed converter is enhanced by 25.5% and 18% at output load currents of 1500 μA and 50 μA, respectively. The proposed step-up dc-dc converter achieves the lowest output voltage and provides the highest conversion efficiency of 83.4% to date in standard CMOS process for thermoelectric energy harvesting.

Original languageEnglish
Article number6923477
Pages (from-to)405-412
Number of pages8
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Volume62
Issue number2
DOIs
StatePublished - 1 Feb 2015

Keywords

  • Adaptive gate biasing
  • dc-dc converter
  • energy redistribution control
  • single inductor multiple output
  • step-up converter
  • thermoelectric energy harvesting

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