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

doi:10.1109/JSSC.2015.2506685

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

Institute of Electronics

Research output: Contribution to journal › Article › peer-review

105 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 language	English
Article number	7383220
Pages (from-to)	523-532
Number of pages	10
Journal	IEEE Journal of Solid-State Circuits
Volume	51
Issue number	2
DOIs	https://doi.org/10.1109/JSSC.2015.2506685
State	Published - 1 Feb 2016

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

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

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10.1109/JSSC.2015.2506685

Cite this

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

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.",

keywords = "Asynchronous mode (AM), buck converter, digital pulsewidth modulation (DPWM), digital zero current detection, pulse-frequency modulation (PFM), tri-mode",

author = "Po-Hung Chen and Wu, \{Chung Shiang\} and Lin, \{Kai Chun\}",

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PY - 2016/2/1

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AB - 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.

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KW - buck converter

KW - digital pulsewidth modulation (DPWM)

KW - digital zero current detection

KW - pulse-frequency modulation (PFM)

KW - tri-mode

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

Abstract

UN SDGs

Keywords

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