Integrated switched-capacitor-based cold-start circuit for DC-DC energy harvesters with wide input/output voltage range and low inductance in 40-nm CMOS

D.K.W. Li, M. Ashourloo, M. Rose, H.J. Bergveld, O. Trescases

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

Abstract

This paper outlines an integrated switched-capacitor (SC)-based cold-start circuit for dc-dc energy harvesters that uniquely combines a low cold-start voltage, wide input/output voltage and low inductance value in the boost stage. The proposed design specifically targets size-constrained, self-powered Internet-of-Things applications. The proposed design is an SC circuit built from low-threshold-voltage devices operating in the sub-threshold region and provides the drive voltage for high-threshold-voltage devices of the boost dc-dc converter. The SC circuit is an NMOS-based Dickson charge pump driven synchronously with a series of cross-coupled voltage doublers and voltage multiplying gate drivers. The SC circuit, which is integrated together with a boost converter as the dc-dc energy harvester, has been implemented in a 40-nm CMOS process for future system-on-chip integration. The measured results show that with a 4.7 μH boost converter inductance, the design can start up from typical input voltages as low as 190 mV while offering up to 2.4 V input and 5 V output voltage compatibility.

Original languageEnglish
Title of host publicationAPEC 2018 - 33rd Annual IEEE Applied Power Electronics Conference and Exposition
PublisherInstitute of Electrical and Electronics Engineers
Pages2104-2109
Number of pages6
Volume2018-March
ISBN (Electronic)9781538611807
DOIs
Publication statusPublished - 18 Apr 2018
Event33rd Annual IEEE Applied Power Electronics Conference and Exposition (APEC 2018) - San Antonio, United States
Duration: 4 Mar 20188 Mar 2018
Conference number: 33

Conference

Conference33rd Annual IEEE Applied Power Electronics Conference and Exposition (APEC 2018)
Abbreviated titleAPEC 2018
CountryUnited States
CitySan Antonio
Period4/03/188/03/18

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