An 80% effeciency and highly adaptable PV energy harvest circuitry with MPPT for IOT devices

Yuan Po Cheng, Chang-Po Chao*, Guan Yu Men, Ching Cheng Yang, Tong Wen Wang

*Corresponding author for this work

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

3 Scopus citations


An on-chip DC-DC converter for energy harvesting is proposed for a new battery-less solar cell tag applied to the Internet of Things (IoTs) devices. The main purpose of this design is to maximize the transfer efficiency and to stably provide a high enough supply voltage to the back-end loads. The overall circuit consists of a crosscoupled charge pump, a maximum power point tracking (MPPT) circuit, a timing control circuit and regulator. The input voltage range is from 0.45V to 3V. The output voltage can be boosted to the required level, in the range of 1V to 3.3V, with more than 60% power conversion efficiency. The throughput power is at least 500pW. A gated clock frequency modulation circuit is designed and adopted in the MPPT unit to lock the input resistance of the charge pump. In addition, a low-dropout (LDO) regulator circuit is used to provide a stable voltage to the load. The experimental results of chip show that the maximum power conversion efficiency (PCE) is 80% at 33pW input power condition.

Original languageEnglish
Title of host publicationIEEE SENSORS 2017 - Conference Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages3
ISBN (Electronic)9781509010127
StatePublished - 21 Dec 2017
Event16th IEEE SENSORS Conference, ICSENS 2017 - Glasgow, United Kingdom
Duration: 30 Oct 20171 Nov 2017

Publication series

NameProceedings of IEEE Sensors
ISSN (Print)1930-0395
ISSN (Electronic)2168-9229


Conference16th IEEE SENSORS Conference, ICSENS 2017
CountryUnited Kingdom


  • Internet of things
  • charge pump
  • energy harvesting
  • maximum power point tracking (MPPT)
  • photovoltaic

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