A 0.48mm² 5µW-10mW Indoor-Outdoor PV Energy-Harvesting Management Unit in a 65nm SoC based on a Single Bidirectional Multi-Gain/Multi-Mode Switched-Cap Converter with Supercap Storage

Bol, David;Boufouss, El Hafed;Flandre, Denis;De Vos, Julien
(2015) 41th European Solid-State Circuits Conference (ESSCIRC 2015) — Location: Graz (Autriche) (14.September.2015)

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A048mm25µW-10mWIndoor-OutdoorPVEnergy-HarvestingManagementUnitina65nmSoCbasedonaSingleBidirectionalMulti-GainMulti-ModeSwitched-CapConverterwithSupercapStorage.pdf
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Authors
  • Bol, Davidorcid-logoUCLouvain
    Author
  • Boufouss, El HafednSilition, Belgium
    Author
  • Flandre, DenisUCLouvain
    Author
  • De Vos, Juliene-peas, Belgium
    Author
Abstract
We propose an energy-harvesting management unit to interface a PV harvester with a storage supercapacitor while generating a 1V regulated supply VREG. Direct connection between stacked PV cells and VREG allows virtual 100% conversion efficiency between the harvester and the supplied circuits, while the use of a single bidirectional switched capacitor DC/DC converter between VREG and the supercap allows 0.48mm2 area in a 65nm IoT vision SoC with a single external filtering capacitor. To cope with the 0-3V charge dependent supercap voltage range and the wide 5μW-10mW harvester/load power range, the converter features adaptive selection between multiple voltage gains and power modes.
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Bol, D., Boufouss, E. H., Flandre, D., & De Vos, J. (2015). A 0.48mm² 5µW-10mW Indoor-Outdoor PV Energy-Harvesting Management Unit in a 65nm SoC based on a Single Bidirectional Multi-Gain/Multi-Mode Switched-Cap Converter with Supercap Storage. Proceedings of ESSCIRC 2015, 4. https://hdl.handle.net/2078.5/252746