Analytical models; Capacitors; diodes; energy harvesting; energy management.; MOSFET circuits; Numerical models; power dissipation; Power supplies; Rectifiers; Resistance; Steady-state; Transistors; Ac voltage; Energy Harvester; Energy management.; Power flows; Power supply; Power-dissipation; Rectifier; Steady state; Electrical and Electronic Engineering
Abstract :
[en] Many energy harvesters (EH) deliver an ac voltage and require a rectifier as a consequence. This paper describes how the rectifier affects the power flow transmitted from the EH to the load and how to tackle the different voltage amplitudes. This study has been performed using analytical calculations, numerical modeling and experiments. To reach the maximum power transfer, conventional methods apply a fraction of the open-circuit voltage delivered by the EH. In contrast, this study points out that the optimum operating point must be shifted by a quantity depending on the rectifier characteristics. This difference is particularly important when the EH provides relatively small ac voltages. Two classic rectifiers are covered: a diode bridge (DB) and a MOSFET bridge (MB). An approximated solution of the analytical model is proposed and allows to optimize the EH without cumbersome numerical computations. Experiments are conducted first with a function generator and then with an electromagnetic EH prototype. The outcomes from the analytical model and the numerical model are in good agreement with the experimental results. A new regulation method is proposed for maximizing the power transferred from the ac EH to the load.
Disciplines :
Electrical & electronics engineering
Author, co-author :
Laurent, Philippe ; Université de Liège - ULiège > Montefiore Institute of Electrical Engineering and Computer Science
Fagnard, Jean-François ; Université de Liège - ULiège > Montefiore Institute of Electrical Engineering and Computer Science
Dupont, François ; Université de Liège - ULiège > Montefiore Institute of Electrical Engineering and Computer Science
Redouté, Jean-Michel ; Université de Liège - ULiège > Département d'électricité, électronique et informatique (Institut Montefiore) > Systèmes microélectroniques intégrés
Language :
English
Title :
Optimization of the Power Flow Generated by an AC Energy Harvester for Variable Operating Conditions
Publication date :
2022
Journal title :
IEEE Transactions on Circuits and Systems I: Regular Papers
ISSN :
1549-8328
eISSN :
1558-0806
Publisher :
Institute of Electrical and Electronics Engineers Inc.
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