Parallel Operation of the Piezoelectric Energy Harvest Using the Taguchi Method
This chapter investigates a technique for a piezoelectric generator system using the synchronized switch harvesting on inductor (SSHI) electronic interface. Piezoelectric materials can convert mechanical energy into electrical energy through direct piezoe
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Abstract This chapter investigates a technique for a piezoelectric generator system using the synchronized switch harvesting on inductor (SSHI) electronic interface. Piezoelectric materials can convert mechanical energy into electrical energy through direct piezoelectric effect. In order to increase the current capability of the power source, several piezoelectric generators are placed in parallel. However, the electricity generated by piezoelectric generator reduces when the piezoelectric materials are parallel connected. To raise the output power density of piezoelectric generator system, a SSHI is used in parallel with the harvesting structure. Two electronic interface structures, the bridge rectifier and the SSHI, are used to harvest the energy from the piezoelectric generator. The structure of the SSHI is better than that of the bridge rectifier. The Taguchi parameter design for the SSHI structure is utilized to harvest energy of piezoelectric generator system, and the results of measurement verify the feasibility of this structure in the experiment. Keywords Synchronized switch harvesting on inductor (SSHI) • Piezoelectric generator • Taguchi method
P.-J. Cheng Department of Electrical Engineering, Nan Jeon Institute of Technology, No. 178, Chaoqin Rd., Yenshui Dist., Tainan City 73746, Taiwan C.-H. Cheng (*) • C.-W. Chen Department of Electrical Engineering, Feng Chia University, No. 100, Wen Hwa Road, Taichung 40724, Taiwan e-mail: [email protected] J. Juang and Y.-C. Huang (eds.), Intelligent Technologies and Engineering Systems, Lecture Notes in Electrical Engineering 234, DOI 10.1007/978-1-4614-6747-2_83, # Springer Science+Business Media New York 2013
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1 Introduction Energy recovery from wasted or unused power has been a topic of discussion in recent times. Unused power exists in various forms such as industrial machines, human activity, vehicles, structures, and environmental sources. Among these, some of the promising sources for recovering energy are periodic vibrations generated by rotating machinery or engines. Primarily, the selection of the energy harvester as compared to other alternatives such as battery depends on two main factors: cost-effectiveness and reliability [1, 2]. Piezoelectric generators are based on the electromechanical energy conversion taking place in a piezoelectric material. Such a generator usually includes a mechanical device designed to apply a driving stress on piezoelectric elements. The piezoelectric elements acting as the generator are connected together to an electrical network constituting the energy receiver [3]. Since a piezoelectric element subjected to a vibration generates an alternating voltage across its electrodes, most of the proposed electrical circuits include an AC-to-DC converter. Thus, the electrical energy is provided to a storage device, such as a capacitor or a battery, in order to feed the terminal electric load under a DC voltage [4–6]. This chapter proposes an approach for piezoelectric energy reclamation from mecha
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