A 5μW-5mW input power range, 0-3.5V output voltage range RF energy harvester with power-estimator-enhanced MPPT controller

Xingyi Hua, Ramesh Harjani

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Scopus citations

Abstract

A 5μW-5mW input power range, 0-3.5V output voltage range RF energy harvester is designed to charge super-capacitors for RFID applications. Voltage protection techniques are used to improve the peak output voltage from 2.5V to 3.5V resulting in a 100% increase in stored energy. An all analog low power maximum power point tracking (MPPT) controller with an embedded power estimator increases the maximum tracking speed by 8x, improves the input power range by 8x, and accumulates 35% more energy during charging transients. The chip is fabricated in TSMC's 65nm GP process, occupies an area of 0.15mm2, and has a measured peak efficiency of 91%.

Original languageEnglish (US)
Title of host publication2018 IEEE Custom Integrated Circuits Conference, CICC 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1-4
Number of pages4
ISBN (Electronic)9781538624838
DOIs
StatePublished - May 9 2018
Event2018 IEEE Custom Integrated Circuits Conference, CICC 2018 - San Diego, United States
Duration: Apr 8 2018Apr 11 2018

Publication series

Name2018 IEEE Custom Integrated Circuits Conference, CICC 2018

Other

Other2018 IEEE Custom Integrated Circuits Conference, CICC 2018
CountryUnited States
CitySan Diego
Period4/8/184/11/18

Bibliographical note

Funding Information:
V. CONCLUSIONS This paper describes an inductive buck-boost DC-DC converter with an adaptive MPPT controller for energy harvesting. A built-in power estimator adapts the MPPT frequency and sampling capacitors with the input power level. This improves the input power range to 1000x, reduces the track time by 8x and improves transient efficiency. Voltage protection techniques extend the maximum output voltage to 3.5V (in a 65nm CMOS GP process), resulting in a 100% increase in the stored energy. The circuit has a peak conversion efficiency of 91%, and an MPPT efficiency of 98.7%. Acknowledgements: Research supported by US Army TATRC.

Publisher Copyright:
© 2018 IEEE.

Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.

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