Wideband piezoelectric energy harvester for low-frequency application with plucking mechanism

Yasuhiro Hiraki; Arata Masuda; Naoto Ikeda; Hidenori Katsumura; Hiroshi Kagata; Hidenori Okumura

doi:10.1117/12.2084551

2 April 2015 Wideband piezoelectric energy harvester for low-frequency application with plucking mechanism

Yasuhiro Hiraki, Arata Masuda, Naoto Ikeda, Hidenori Katsumura, Hiroshi Kagata, Hidenori Okumura

Proceedings Volume 9431, Active and Passive Smart Structures and Integrated Systems 2015; 943137 (2015) https://doi.org/10.1117/12.2084551
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2015, San Diego, California, United States

Abstract

Wireless sensor networks need energy harvesting from vibrational environment for their power supply. The conventional resonance type vibration energy harvesters, however, are not always effective for low frequency application. The purpose of this paper is to propose a high efficiency energy harvester for low frequency application by utilizing plucking and SSHI techniques, and to investigate the effects of applying those techniques in terms of the energy harvesting efficiency. First, we derived an approximate formulation of energy harvesting efficiency of the plucking device by theoretical analysis. Next, it was confirmed that the improved efficiency agreed with numerical and experimental results. Also, a parallel SSHI, a switching circuit technique to improve the performance of the harvester was introduced and examined by numerical simulations and experiments. Contrary to the simulated results in which the efficiency was improved from 13.1% to 22.6% by introducing the SSHI circuit, the efficiency obtained in the experiment was only 7.43%. This would due to the internal resistance of the inductors and photo MOS relays on the switching circuit and the simulation including this factor revealed large negative influence of it. This result suggested that the reduction of the switching resistance was significantly important to the implementation of SSHI.

Citation Download Citation

Yasuhiro Hiraki, Arata Masuda, Naoto Ikeda, Hidenori Katsumura, Hiroshi Kagata, and Hidenori Okumura "Wideband piezoelectric energy harvester for low-frequency application with plucking mechanism", Proc. SPIE 9431, Active and Passive Smart Structures and Integrated Systems 2015, 943137 (2 April 2015); https://doi.org/10.1117/12.2084551

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