A 50 nW-to-10 mW Output Power Tri-Mode Digital Buck Converter With Self-Tracking Zero Current Detection for Photovoltaic Energy Harvesting

Po-Hung Chen, Chung Shiang Wu, Kai Chun Lin

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

This paper presents a tri-mode digital buck converter in 0.18-μm CMOS technology for photovoltaic energy harvesting. The on-chip gate-boosted digital pulsewidth modulation (DPWM) improves the conversion efficiency at heavy load conditions. Pulse-frequency modulation (PFM) along with digital self-tracking zero current detection is proposed to avoid reverse current at light load. The asynchronous mode (AM) operation further reduces the controller loss and improves the conversion efficiency at ultra-light load conditions. By applying DPWM, PFM, and AM at different load conditions, the proposed converter provides a maximum conversion efficiency of 92% with output power ranging from 50 nW to 10 mW. In addition, the proposed buck converter achieves more than 70% efficiency from 400 nW to 10 mW output power.

Original languageEnglish
Article number7383220
Pages (from-to)523-532
Number of pages10
JournalIEEE Journal of Solid-State Circuits
Volume51
Issue number2
DOIs
StatePublished - 1 Feb 2016

Keywords

  • Asynchronous mode (AM)
  • buck converter
  • digital pulsewidth modulation (DPWM)
  • digital zero current detection
  • pulse-frequency modulation (PFM)
  • tri-mode

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