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Micromachines 2017, 8(4), 115; doi:10.3390/mi8040115

Helical Piezoelectric Energy Harvester and Its Application to Energy Harvesting Garments

Department of Electronic Engineering, Sogang University, Seoul 04107, South Korea
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Author to whom correspondence should be addressed.
Academic Editors: Hiroshi Toshiyoshi and Chang-Hyeon Ji
Received: 18 January 2017 / Revised: 31 March 2017 / Accepted: 31 March 2017 / Published: 4 April 2017
(This article belongs to the Special Issue MEMS Energy Harvesters)
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Abstract

In this paper, we propose a helical piezoelectric energy harvester, examine its application to clothes in the form of an energy harvesting garment, and analyze its design and characteristics. The helical harvester is composed of an elastic core and a polymer piezoelectric strap twining the core. The fabricated harvester is highly elastic and can be stretched up to 158% of its initial length. Following the experiments using three different designs, the maximum output power is measured as 1.42 mW at a 3 MΩ load resistance and 1 Hz motional frequency. The proposed helical harvesters are applied at four positions of stretchable tight-fitting sportswear, namely shoulder, arm joint, knee, and hip. The maximum output voltage is measured as more than 20 V from the harvester at the knee position during intended body motions. In addition, electric power is also generated from this energy harvesting garment during daily human motions, which is about 3.9 V at the elbow, 3.1 V at the knee, and 4.4 V at the knee during push-up, walking, and squatting motions, respectively. View Full-Text
Keywords: piezoelectric energy harvester; helical; energy harvesting garment; human body motions; wearable piezoelectric energy harvester; helical; energy harvesting garment; human body motions; wearable
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Kim, M.; Yun, K.-S. Helical Piezoelectric Energy Harvester and Its Application to Energy Harvesting Garments. Micromachines 2017, 8, 115.

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