Single-Inductor Dual-Input Dual-Output Battery-PV Hybrid System with 2-D Adaptive On-Time Control for Internet of Things

Hui Hsuan Lee, Chi Wei Liu, Makoto Takamiya, Po Hung Chen*

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

In this article, we present a single-inductor dual-input dual-output power converter with two-dimensional adaptive-on-time (2-D AOT) control for Internet of things (IoT) applications. The proposed system combines energy from a 0.55-0.7 V photovoltaic (PV) module with a non-rechargeable 1.4-V zinc-air battery to extend the battery life. The proposed converter employs the buck-boost mode and the buck mode for the PV module and the battery, respectively, to produce two output voltages for different loading currents. The proposed 2-D AOT technique not only reduces the output voltage ripple but also improves the dual-source conversion efficiency over a wide input voltage range. Moreover, the response time of the self-tracking zero-current detector can also be improved by the proposed 2-D AOT. We fabricated the test chip using 0.18- μ m technology in an area of 1.9×2.2 mm2. The measurement results demonstrated a peak efficiency of 92.5% with an input voltage range of 0.55-1.4 V. The output voltage ripple was less than 2.3% VOUT under different input voltage ranges.

Original languageEnglish
Article number8903529
Pages (from-to)1069-1078
Number of pages10
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Volume67
Issue number3
DOIs
StatePublished - Mar 2020

Keywords

  • 2-D adaptive-on-time
  • DC-DC converter
  • photovoltaic energy harvesting
  • single-inductor dual-input dual-output

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