Real time maximum power conversion tracking and resonant frequency modification for high power piezoelectric ultrasound transducer
Ghasemi, Negareh, Walker, Geoffrey R., & Broadmeadow, Mark A. H. (2015) Real time maximum power conversion tracking and resonant frequency modification for high power piezoelectric ultrasound transducer. In The 11th IEEE International Conference on Power Electronics and Drive Systems (PEDS 2015), 9-12 June 2015, Sydney, Australia.
Piezoelectric ultrasound transducers are commonly used to convert mechanical energy to electrical energy and vice versa. The transducer performance is highly affected by the frequency at which it is excited. If excitation frequency and main resonant frequency match, transducers can deliver maximum power. However, the problem is that main resonant frequency changes in real time operation resulting in low power conversion. To achieve the maximum possible power conversion, the transducer should be excited at its resonant frequency estimated in real time. This paper proposes a method to first estimate the resonant frequency of the transducer and then tunes the excitation frequency accordingly in real time. The measurement showed a significant difference between the offline and real time resonant frequencies. Also, it was shown that the maximum power was achieved at the resonant frequency estimated in real time compare to the one measured offline.
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|Item Type:||Conference Paper|
|Keywords:||High Power Piezoelectric Ultrasound Transducer, Power Conversion, Resonant Frequency|
|Divisions:||Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Copyright Owner:||Copyright 2015 Crown|
|Deposited On:||21 Aug 2015 00:34|
|Last Modified:||24 Aug 2015 11:29|
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