Capacitance; Capacitors; Energy harvesting; Implants; Inductors; Investment; Reservoirs; Switches; Implants (surgical); Inductance; Actuating frequency; Analytical expressions; Harvesting energies; Implantable devices; Inductance values; Reservoir capacitors; Small form factors; Variable capacitances; Electric inductors
Abstract :
[en] Many variable-capacitance energy harvesters employ a large inductor to improve their power efficiency by reducing conduction losses, which is sub-optimal in applications requiring a small form-factor, such as in implants. This paper describes a variable-capacitance harvester that performs optimally using miniaturized inductors. The impact of scaling the inductor on the generated energy of conventional semi-synchronous and fully-synchronous charge-constraint topologies is investigated analytically as well as experimentally. It is shown that the proposed harvester outperforms the semi-synchronous and fully-synchronous charge-constraint harvesters while using very small inductance values. Using two reservoir capacitors to generate energy without requiring large inductors, as well as utilizing a different switching scheme are the main factors contributing to this advantage. Since harvesting energy from slow moving mechanical sources, such as body movements, constitutes a major challenge, all three harvesters are implemented and tested with an actuating frequency as low as 0.5 Hz and for inductance values between 1 uH to 1 mH. The experimental results for sample designs corroborate the analytical expressions and show that to generate optimal harvested energy of the proposed harvester, the semi-synchronous harvester requires a 15.6 times larger inductor. IEEE
Disciplines :
Electrical & electronics engineering
Author, co-author :
Daneshvar, S. H.; Electrical and Computer Systems Engineering, Monash University, 2541 Clayton, Victoria, Australia, 3800 (e-mail: hossein.daneshvar@monash.edu)
Maymandi-Nejad, M.; Ferdowsi University of Mashhad Faculty of Engineering, 108847 Mashhad, Razavi Khorasan, Iran (the Islamic Republic of), (e-mail: maymandi@um.ac.ir)
Yuce, M. R.; Electrical and Computer Systems Engineering, Monash University, 2541 Clayton, Victoria, Australia, (e-mail: mehmet.yuce@monash.edu)
Redouté, Jean-Michel ; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Systèmes microélectroniques intégrés
Language :
English
Title :
A Variable-Capacitance Energy Harvester with Miniaturized Inductor Targeting Implantable Devices
Publication date :
2022
Journal title :
IEEE Transactions on Industrial Electronics
ISSN :
0278-0046
eISSN :
1557-9948
Publisher :
Institute of Electrical and Electronics Engineers Inc.
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