TY - JOUR
T1 - An Experimentally Validated Lumped Circuit Model for Piezoelectric and Electrodynamic Hybrid Harvesters
AU - Sriramdas, Rammohan
AU - Pratap, Rudra
N1 - Funding Information:
Manuscript received August 29, 2017; accepted November 9, 2017. Date of publication November 24, 2017; date of current version February 21, 2018. This work was supported by NPMASS Grant and the facilities created by NPMASS Projects, Centre for Nano Science and Engineering, Indian Institute of Science, Bengaluru, India. The associate editor coordinating the review of this paper and approving it for publication was Prof. Alper Bozkurt. (Corresponding author: Rammohan Sriramdas.) The authors are with the Centre for Nano Science and Engineering, Mechanical Engineering Department, Indian Institute of Science, Bengaluru 560012, India (e-mail: [email protected]; [email protected]). Digital Object Identifier 10.1109/JSEN.2017.2776242
Publisher Copyright:
© 2001-2012 IEEE.
PY - 2018/3/15
Y1 - 2018/3/15
N2 - Energy harvesters transform the ambient energy into usable electrical form that can be potentially used by sensors and other low-power devices. In this paper, modeling of a hybrid energy harvester that is composed of piezoelectric and electrodynamic mechanisms of energy conversion is presented and the predictions from the model are corroborated by experimental results from two hybrid harvesters designed and fabricated for the purpose. A method of representing a hybrid energy harvester using lumped circuit elements is proposed. The optimal electrical loads are then determined with relative ease from the equivalent circuit of the harvester. A magnetic circuit that provides maximum electromechanical coupling in the electrodynamic domain is designed. Moreover, a curved piezoelectric beam is analyzed for a compact arrangement of both domains in a single harvester. Two hybrid energy harvesters having the same electrodynamic domain, one with curved piezoelectric beam and the other with a straight piezoelectric beam, are fabricated and evaluated for their performance in comparison with that estimated from the proposed model. Experimental models generating 1.7 mW from 0.5 \text{g}-{n} input acceleration have been realized with at least 50% of conversion efficiency.
AB - Energy harvesters transform the ambient energy into usable electrical form that can be potentially used by sensors and other low-power devices. In this paper, modeling of a hybrid energy harvester that is composed of piezoelectric and electrodynamic mechanisms of energy conversion is presented and the predictions from the model are corroborated by experimental results from two hybrid harvesters designed and fabricated for the purpose. A method of representing a hybrid energy harvester using lumped circuit elements is proposed. The optimal electrical loads are then determined with relative ease from the equivalent circuit of the harvester. A magnetic circuit that provides maximum electromechanical coupling in the electrodynamic domain is designed. Moreover, a curved piezoelectric beam is analyzed for a compact arrangement of both domains in a single harvester. Two hybrid energy harvesters having the same electrodynamic domain, one with curved piezoelectric beam and the other with a straight piezoelectric beam, are fabricated and evaluated for their performance in comparison with that estimated from the proposed model. Experimental models generating 1.7 mW from 0.5 \text{g}-{n} input acceleration have been realized with at least 50% of conversion efficiency.
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U2 - 10.1109/JSEN.2017.2776242
DO - 10.1109/JSEN.2017.2776242
M3 - Article
AN - SCOPUS:85035747751
SN - 1530-437X
VL - 18
SP - 2377
EP - 2384
JO - IEEE Sensors Journal
JF - IEEE Sensors Journal
IS - 6
ER -