A high cell count cascade full bridge converter for wide bandwidth ultrasonic transducer excitation

Walker, Geoffrey R., Ghasemi, Negareh, Broadmeadow, Mark A. H., & Ledwich, Gerard F. (2014) A high cell count cascade full bridge converter for wide bandwidth ultrasonic transducer excitation. In Proceedings of the 2014 Energy Conversion Congress and Exposition (ECCE), IEEE, Pittsburgh Convention Center, Pittsburgh, PA, USA, pp. 2140-2146.

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A nine level modular multilevel cascade converter (MMCC) based on four full bridge cells is shown driving a piezoelectric ultrasonic transducer at 71 and 39 kHz, in simulation and experimentally. The modular cells are small stackable PCBs, each with two fully integrated surface mount 22 V, 40 A MOSFET half-bridge converters, and include all control signal and power isolation. In this work, the bridges operate at 12 V and 384 kHz, to deliver a 96 Vpp 9 level waveform with an effective switching frequency of 3 MHz. A 9 pH air cored inductor forms a low pass filter in conjunction with the 3000 pF capacitance of the transducer load. Eight equally phase-displaced naturally sampled pulse width modulation (PWM) drive signals, along with the modulating sinusoid, are generated using phase accumulation techniques in a dedicated FPGA. Experimental time domain and FFT plots of the multilevel and transducer output waveforms are presented and discussed.

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ID Code: 75028
Item Type: Conference Paper
Refereed: Yes
Keywords: Ultrasonic Transducer , Transducer Excitation, Cascade Converters
DOI: 10.1109/ECCE.2014.6953686
ISBN: 978-1-4799-5776-7
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600)
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Statement: Copyright 2014 please consult author(s)
Deposited On: 13 Aug 2014 23:03
Last Modified: 03 Dec 2014 03:53

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