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Abstract
A ring-type step-down piezoelectric transformer based on 0.65Pb(Mg1/2Nb2/3)O3-0.35PbTiO3 ceramic was manufactured to study its main operational characteristics through experimental measurements and numerical simulations based on the corresponding electrical equivalent circuit. The measured resonance frequency of 93.4 kHz was observed for the first vibration mode and the measured voltage gain and maximum efficiency were 0.1 and 49.3%, respectively, for the load resistance of 500 Ω. The simulated voltage gain and maximum efficiency were 44.3% and 0.1 at 733 Ω. The possible origin of the low efficiency in the studied piezoelectric transformer is discussed.
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Acknowledgments and funding
The authors would like to thank the Eletrosul Centrais Elétricas S.A, the US Air Force Office of Scientific Research (AFOSR) (FA9550-16-1-0127) for providing experimental facilities and financial support for this work, and thanks to Prof. V. Dmitriev (UFPA) for allowing the use of COMSOL software. Our gratitude to the Brazilian agencies CNPq (Grant 304604/2015-1), CAPES and FAPESP for financial support.