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

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88 引文斯高帕斯（Scopus）

摘要

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.

原文	English
文章編號	7383220
頁（從 - 到）	523-532
頁數	10
期刊	IEEE Journal of Solid-State Circuits
卷	51
發行號	2
DOIs	https://doi.org/10.1109/JSSC.2015.2506685
出版狀態	Published - 1 2月 2016

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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",

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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

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