Multiple-Input Harvesting Power Management Unit With Enhanced Boosting Scheme for IoT Applications

被引:11
作者
Abuellil, Amr [1 ,2 ]
Estrada-Lopez, Johan J. [1 ,3 ]
Bommireddipalli, Aditya [1 ,4 ]
Costilla-Reyes, Alfredo [1 ]
Zeng, Zizhen [1 ]
Sanchez-Sinencio, Edgar [1 ]
机构
[1] Texas A&M Univ, Dept Elect Engn, College Stn, TX 77843 USA
[2] Goodix Inc, RF AMS Grp, San Diego, CA 92121 USA
[3] Univ Autonoma Yucatan, Fac Math, Merida 97000, Mexico
[4] Texas Instruments Inc, Precis Data Converter Grp, Tucson, AZ 85711 USA
关键词
Cold start-up (SU); energy flow detection (EFD); enhanced boosting; harvesting; hybrid LDO (H-LDO); Internet of Things (IoT); maximum power point tracking (MPPT); pulsed battery charging; supercapacitors; SYSTEM; SOLAR;
D O I
10.1109/TIE.2019.2920607
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
Powering Internet of Things sensor nodes in the expanding application platforms requires a highly efficient power management unit (PMU), with adaptive power consumption based on harvester energy availability and load conditions. To provide continuous reliable operation, this paper presents a PMU, which is able to extract energy from four energy sources, while providing independent maximum power point tracking (MPPT) for each harvester. With MPPT being achieved independent of voltage boosting, a novel step-up ratio technique is implemented for enhancing charging time and efficiency by 33.5% (3.5x). A fully digital technique to detect harvester energy flow is designed to scale down system power during energy drought periods, while being able to cold-start from inputs as low as 0.4 V. The stored energy is used by load through a hybrid analog-digital linear dropout regulator (LDO) or further boosted for pulsed battery charging. The chip is fabricated in the 180-nm process with an area of 0.46 and achieves a maximum power delivery of 2.6 mW and a maximum end-to-end efficiency of 70% at 40 mu w.
引用
收藏
页码:3662 / 3672
页数:11
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