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A Dual-Mode Continuously Scalable-Conversion-Ratio SC Energy Harvesting Interface With SC-Based PFM MPPT and Flying Capacitor Sharing Scheme

Authors
Kim, HyunjinMaeng, JunyoungPark, InhoJeon, JinwooChoi, YohanKim, Chulwoo
Issue Date
9월-2021
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords
Maximum power point trackers; Batteries; Switches; Capacitors; Power conversion; Video recording; Power generation; Continuously scalable-conversion-ratio (CSCR); dc--dc converter; dual-input dual-output; energy harvesting (EH); Internet of Things (IoT); maximum power point tracking (MPPT)
Citation
IEEE JOURNAL OF SOLID-STATE CIRCUITS, v.56, no.9, pp.2724 - 2735
Indexed
SCIE
SCOPUS
Journal Title
IEEE JOURNAL OF SOLID-STATE CIRCUITS
Volume
56
Number
9
Start Page
2724
End Page
2735
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/136707
DOI
10.1109/JSSC.2020.3048481
ISSN
0018-9200
Abstract
This article proposes a continuously scalable-conversion-ratio (CSCR) switched-capacitor (SC) energy harvesting interface that extracts power from a thermoelectric generator (TEG), regulates a 0.75-V output load, and manages a 1.2-1.45-V battery. The structure employs the proposed CSCR SC converter to improve the power conversion efficiency up to 7.9% higher than that of the conventional converter. Moreover, the structure utilizes a proposed SC-based pulse frequency modulation (PFM) maximum power point tracking (MPPT) method to extract power from a TEG with an MPPT efficiency above 98.15%. In addition, the proposed interface adopts a flying capacitor sharing scheme for the dual-mode operation of the SC interface to increase both the peak end-to-end efficiency and maximum output power. With a 180-nm CMOS process, the proposed interface achieves a peak end-to-end efficiency of 85.4% and maximum output power of 20.8 mW.
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