Piezogenerator impedance matching using Mason equivalent circuit for harvester identification

Yang Li; Claude Richard

doi:10.1117/12.2044793

1 April 2014 Piezogenerator impedance matching using Mason equivalent circuit for harvester identification

Yang Li, Claude Richard

Proceedings Volume 9057, Active and Passive Smart Structures and Integrated Systems 2014; 90572I (2014) https://doi.org/10.1117/12.2044793
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2014, San Diego, California, United States

Abstract

Any piezoelectric generator structure can be modeled close to its resonance by an equivalent circuit derived from the well known Mason equivalent circuit. This equivalent circuit can therefore be used in order to optimize the harvested power using usual electrical impedance matching. The objective of this paper is to illustrate the full process leading to the definition of the proper passive load allowing the optimization of the harvested energy of any harvesting device. First, the electric equivalent circuit of the generator is derived from the Mason equivalent circuit of a seismic harvester. Theoretical ideal impedance matching and optimal load analyze is then given emphasizing the fact that for a given acceleration a constant optimal output power is achievable for any frequency as long as the optimal load is feasible. Identification of the equivalent circuit of an experimental seismic harvester is then derived and matched impedance is defined both theoretically and experimentally. Results demonstrate that an optimal load can always be obtained and that the corresponding output power is constant. However, it is very sensitive to this impedance, and that even if impedance matching is a longtime well known technique, it is not really experimentally and practically achievable.

Citation Download Citation

Yang Li and Claude Richard "Piezogenerator impedance matching using Mason equivalent circuit for harvester identification", Proc. SPIE 9057, Active and Passive Smart Structures and Integrated Systems 2014, 90572I (1 April 2014); https://doi.org/10.1117/12.2044793

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