A charge pump with mppt circuit employed in batteryless photovoltaic iot tags

Guan Yu Men, Yuan Po Cheng, Chang-Po Chao, Ching Cheng Yang, Eka Fitrah Pribadi

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

2 Scopus citations

Abstract

A DC-DC regulator is proposed to attach to the battery-less solar tag applied in the Internet of Things (IoTs) market. Two main purposes in this design is to maximize the power transfer efficiency and to provide a high voltage supply to the back-end circuit. The overall circuit consists of the cross-coupled charge pump, optimal power point tracking and timing control circuit. It is expected to boost the input voltage from 0.55-0.65V to the output of 1-1.1V at 80-100μW condition. Gated PFM circuit is adopted in the optimal power point tracking system to modulate the input frequency of the charge pump to match the inner resistance of the solar cell. This system has been taped-out by TSMC 0.18UM 1P6M process twice and N-fab 0.35UM process once. The experimental results of this chip show that the voltage conversion efficiency (VCE) is 97% and the power conversion efficiency (PCE) is 11.7% at 30μW input power condition. The reason of the low efficiency has been found and improved by enhancing the pumping capacitance. The efficiency of the 3rd tape-out in N-fab has been improved to 81.2% according to the simulation results.

Original languageEnglish
Title of host publicationASME 2016 Conference on Information Storage and Processing Systems, ISPS 2016
PublisherAmerican Society of Mechanical Engineers
ISBN (Electronic)9780791849880
DOIs
StatePublished - 1 Jan 2016
EventASME 2016 Conference on Information Storage and Processing Systems, ISPS 2016 - Santa Clara, United States
Duration: 20 Jun 201621 Jun 2016

Publication series

NameASME 2016 Conference on Information Storage and Processing Systems, ISPS 2016

Conference

ConferenceASME 2016 Conference on Information Storage and Processing Systems, ISPS 2016
CountryUnited States
CitySanta Clara
Period20/06/1621/06/16

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