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

被引：89

作者：

Chen, Po-Hung ^{[1
]}

Wu, Chung-Shiang ^{[1
]}

Lin, Kai-Chun ^{[1
]}

机构：

[1] Natl Chiao Tung Univ, Hsinchu 30010, Taiwan

来源：

IEEE JOURNAL OF SOLID-STATE CIRCUITS | 2016年 / 51卷 / 02期

关键词：

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

D O I：

10.1109/JSSC.2015.2506685

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This paper presents a tri-mode digital buck converter in 0.18-mu m 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.

引用

页码：523 / 532

页数：10

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