A high frequency current source converter with adjustable magnitude to drive high power piezoelectric transducers
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A general electrical model of a piezoelectric transducer for ultrasound applications consists of a capacitor in parallel with RLC legs. A high power voltage source converter can however generate significant voltage stress across the transducer that creates high leakage currents. One solution is to reduce the voltage stress across the piezoelectric transducer by using an LC filter, however a main drawback is changing the piezoelectric resonant frequency and its characteristics. Thereby it reduces the efficiency of energy conversion through the transducer. This paper proposes that a high frequency current source converter is a suitable topology to drive high power piezoelectric transducers efficiently.
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Davari, P.; Ghasemi, N.; zare, F.; O'Shea, P.; Ghosh, Arindam (2012)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 ...
Ghasemi, N.; zare, F.; Davari, P.; Langton, C.; Weber, P.; Ghosh, Arindam (2012)Piezoelectric transducers convert electrical energy to mechanical energy and play a great role in ultrasound systems. Ultrasound power transducer performance is strongly related to the applied electrical excitation. To ...
Dissimilar trend of nonlinearity in ultrasound transducers and systems at resonance and non-resonance frequenciesGhasemi, N.; Zare, F.; Davari, P.; Vilathgamuwa, M.; Ghosh, Arindam; Langton, C.; Weber, P. (2017)Several factors can affect performance of an ultrasound system such as quality of excitation signal and ultrasound transducer behaviour. Nonlinearity of piezoelectric ultrasound transducers is a key determinant in designing ...