Power management using photovoltaic cells for implantable devices

Oo Htet, K., Ghannam, R. , Abbasi, Q. H. and Heidari, H. (2018) Power management using photovoltaic cells for implantable devices. IEEE Access, 6, pp. 42156-42164. (doi: 10.1109/ACCESS.2018.2860793)

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This paper presents a novel inductor-less switched capacitor (SC) DC-DC converter, which generates simultaneous dual-output voltages for implantable electronic devices. Present dual output converters are limited to fixed ratio gain, which degrade conversion efficiency when the input voltage changes. The proposed power converter offers both step-up and step-down conversion with 4-phase reconfigurable logic. With an input voltage of 1 V provided by photovoltaic (PV) cells, the proposed converter achieves step-up, step-down and synchronised voltage conversions in four gain modes. These are 1.5 V and 0.5 V for Normal mode, 2 V and 1 V for High mode, 2 V for Double Boost mode, as well as 3 V and 2 V for Super Boost mode with the ripple variation of 14-59 mV. The converter circuit has been simulated in standard 0.18 μm CMOS technology and the results agree with state-of-the-art SC converters. However, our proposed monolithically integrated PV powered circuit achieves a conversion efficiency of 85.26% and provides extra flexibility in terms of gain, which is advantageous for future implantable applications that have a range of inputs. This research is therefore an important step in achieving truly autonomous implantable electronic devices.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Abbasi, Dr Qammer and Ghannam, Dr Rami and Heidari, Professor Hadi and Oo Htet, Kaung
Authors: Oo Htet, K., Ghannam, R., Abbasi, Q. H., and Heidari, H.
College/School:College of Science and Engineering
College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:IEEE Access
ISSN (Online):2169-3536
Published Online:06 August 2018
Copyright Holders:Copyright © 2018 IEE
First Published:First published in IEEE Access 6: 42156-42164
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
3028770Magnetic Diagnostics Setup for Lab-on-Chip ApplicationHadi HeidariThe Royal Society (ROYSOC)RSG\R1|180269ENG - Electronics & Nanoscale Engineering