30.2 A 93.2%-Efficiency Multi-Input Bipolar Energy Harvester with 17.9× MPPT Loss Reduction

Zhen Yu Yang, An Chen, Cheng Wen Chen, Wei Chieh Hung, Ke Horng Chen, Kuo Lin Zheng, Ying Hsi Lin, Shian Ru Lin, Tsung Yen Tsai

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Today's multi-input energy harvesters need to accommodate different energies, such as sub-1mu W from radio frequency (RF), tens of mu W from thermal energy generators (TEG), and hundreds of muW from photovoltaic (PV). The generic harvesting controller in [1] cannot be used for ultra-low energy sources due to the increased quiescent current (I Q). Although an ultra-low energy source can be obtained by the Battery-TEG Pile-up Buck (BTPB) supply [2] (top left of Fig. 30.2.1), the increased peak inductor current causes a larger input source voltage ripple, Delta VSRC. If VBAT=1.2V and VSRC=0.5V from TEG, then Delta VSRC will increase to 28.8mV (equal to 11.5% of VOC/2, where VOC is the open circuit voltage), as shown in the middle of Fig. 30.2.1, thereby increasing power loss and degrading maximum power point tracking (MPPT) efficiency. Also, energy cannot be harvested in [2] when VStextRC is negative due to the bipolar TEG. A bulky transformer is used in [3] to obtain a bipolar VStextRC, and yet, resulting in a low power density that is not suitable for Internet of Things (loT) applications.

Original languageEnglish
Title of host publication2023 IEEE International Solid-State Circuits Conference, ISSCC 2023
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages440-442
Number of pages3
ISBN (Electronic)9781665428002
DOIs
StatePublished - 2023
Event2023 IEEE International Solid-State Circuits Conference, ISSCC 2023 - Virtual, Online, United States
Duration: 19 Feb 202323 Feb 2023

Publication series

NameDigest of Technical Papers - IEEE International Solid-State Circuits Conference
Volume2023-February
ISSN (Print)0193-6530

Conference

Conference2023 IEEE International Solid-State Circuits Conference, ISSCC 2023
Country/TerritoryUnited States
CityVirtual, Online
Period19/02/2323/02/23

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