Improving the efficiency of high power piezoelectric transducers for industrial applications

Davari, Pooya, Ghasemi, Negareh, Zare, Firuz, O'Shea, Peter J., & Ghosh, Arindam (2012) Improving the efficiency of high power piezoelectric transducers for industrial applications. IET Science, Measurement and Technology, 6(4), pp. 213-221.

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Most high-power ultrasound applications are driven by two-level inverters. However, the broad spectral content of the two-level pulse results in undesired harmonics that can decrease the performance of the system significantly. On the other hand, it is crucial to excite the piezoelectric devices at their main resonant frequency in order to have maximum energy conversion. Therefore a high-quality, low-distorted power signal is needed to excite the high-power piezoelectric transducer at its resonant frequency. This study proposes an efficient approach to develop the performance of high-power ultrasonic applications using multilevel inverters along with a frequency estimation algorithm. In this method, the resonant frequencies are estimated based on relative minimums of the piezoelectric impedance frequency response. The algorithm follows the resonant frequency variation and adapts the multilevel inverter reference frequency to drive an ultrasound transducer at high power. Extensive simulation and experimental results indicate the effectiveness of the proposed approach.

Impact and interest:

3 citations in Scopus
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3 citations in Web of Science®

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ID Code: 58288
Item Type: Journal Article
Refereed: Yes
Keywords: Power electronics, High power piezo electric, Multi-level converter, Frequency detection algorithm, Resonance frequency
DOI: 10.1049/iet-smt.2011.0209
ISSN: 1751-8822
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 14 Mar 2013 23:29
Last Modified: 18 Mar 2013 00:18

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